Talk to a friend, he said he built several of the GMC V6s. He said he would setup a oil spray on cam to quieten the solid lifters. Said he hooked up a sump pump to the oil pan ran lines through cam plate under intake. His 63 3/4 ton has a 351 with about 750,000 miles on the engine rebuild. I saw the spray setup, it works great, he thinks it run well over 1million miles. The truck is driven daily since bought by his Dad in 63.
Those are really cool engines . I am doing a rebuild on a 1965 462 Lincoln out of a Limo and a 1965 429 Cadillac . Weird how you can get two odd engines from the same year at the same time . I have an engine machine shop here in Alabama . Advantage Engine Restoration is the name of my business . I have been doing this kind of work for 34 years now .
I just stumbled upon your build series of the gmc 305 v6. My Dad, just recently, found out his block is cracked and is in the process of looking for another one. His truck is a 63 gmc step side short bed. He's had it since the late 70s, I believe. And it's hauled a lot of cattle and been through a lot of worked up fields. Dad is 80 now, has taken this truck to hell and back many times. Floor boards and fenders are rusted through (mostly because the previous owner used to four wheel through creeks in the hills and it's a 2 wheel drive ) but he doesn't care. He just wants his baby back. It is his everyday run around work truck. His other truck is a 2007 chevy 2500hd. But it has a tool box and a fifth wheel hitch so he can't use it to haul stuff. Thanks for all of your technical commentary, it's very enlightening. I going to watch as much as I can on this series. It's just hard to watch videos like this on a phone. But it is the only internet we can get out here. I'm in the central valley of California and between two rivers.
Yes, great idea I like the way you think, How about some of the older OHV engines like the Olds rocket 88, maybe early 50's hemi, or the polys? Of course your only one man can only do so much. Thanks again for the videos.
Yep there are only so many hours in the day for every minute of posted video there is probably 10 minutes of off camera work and prep to be done that no one sees I't is not fee sable to post all of that and it would also be quite boring to the viewer
Long time master mechanic and machinist here and now retired age 68. I owned one of those V6 engines way back between 1972 and 1974 in a 1961 GMC pickup with automatic. I was a teen back then and it was an old beat up pickup, but that old strong V6 engine didnt fail in that two years and was strong. Back then I had no clue what the CI was on it of whether it was the 305 V6 or maybe larger. After seeing you take that one apart I wish that was in all three of my trucks now! In all my years I have never seen a gasoline engine built that well. I would classify it as a forever engine
Onward with the 305! On my '63 305E in a CarryAll, I pulled it down and found less than 10,000th wear in the cylinders, bored it out the minimum and ended up with a 315 V6. Ran for another 200k...
Also. I'd certainly subscribe to paid content. I'm all about supporting EXCELLENT information online. Especially automotive since I've learned so much not having a background in it myself.
I am very intrigued. I happen to have a 62 gmc sitting in my yard getting the three on the tree column fixed. It has one of these engines. I'm a ford guy through and through, but this engine is very impressive. I like your videos...awesome detail and very descriptive. Good job!
I'm enjoying the show....Back in the day we would rebuild the old cast iron pumps..I wonder if kits are still available for one of those...That would make a great vid too..And we'd reface the lifters .023 degrees...Gotta keep 'em spinning.
I saw the 351 cid version of this engine in a massive quad cab 3/4 ton Forestry Service fleet pickup. They are physically so big that I thought it was a V8! Cool build, thanks. 👍
They replaced the 302 GMC straight 6 that had "simple basic engineering made to last" also, and the engine bay of GMC pickups could accommodate any engine. (no need to use V6 to squeeze into limited space.)
Wow, you were braver than me on that timing cover. Using an impact would have scared me about breaking them off. And I know that it was obvious that this motor had seen more than one rodeo.
I’m having flashbacks watching these videos. I learned a lot working on mine back in the day. Parts weren’t easy to find 20 plus years ago either. Cool rebuild though. Thanks
Forgot to add in previous comment that you have A Fantastic youtube Channel! As I am a 1970s Chevy Enhusiast and Hotrodder you take me to when I had those GM part numbers of heads and etc. memorized for "Junk Yard" (they call them Recyclers now!) searches! For the youngsters seeking info on vintage iron I direct them to your channel!
@@militarychevy711 bought my 62 from the original owner's kid. At 396k it is still going strong. According to the kid, it has never even had the heads or oil pan off. I am doing head gaskets and a timing chain the week after next, so I am excited to find out if it is true or not.
@@zestamaster it still had the original head gaskets. Pretty sure that the timing set was original too, given how stretched it was. I ended up selling it when I was done to fund the vortec 350/nv3500 swap. It's making a lot more power now!
This brought back a flood of memories from when this type of design was commonplace. Is it wrong to miss woodruff keys? Or brick shi+house, rock solid performance that was indestructible under almost any circumstance? No wonder GM had to kill it. Finally I understand.
My dad had a 65 GMC with this engine. It was a beast for torque. He once pulled a loaded Semi to a start with it. He had a heavy load and 12" tires on the truck. It didn't have much top end. Aa I recall, 80 was around top speed. I do recall they made a diesel version which I believe was a two stroke.
No, the diesel version was a 4 stroke. The 478 V6 and 637 V8 were available in both gas and diesel versions. If I remember right, the diesels were painted green. The GMC Detroit Diesels (3-53, 4-71, 6-71, 8V-92, etc) were 2 stroke.
I am still learning all the time the automotive industry changes so rapidly it is a constant challenge to keep up what I worry about it the late 20's early 30's guy who knows everything you need to run from those guys
Look at that bore spacing! wow! No wonder they had a 370 some odd cubic inch v6...what a wide gap! thick walls...wonder how much boost this thing could handle...turbo it!
there r a lot of parts on this outstanding engine That remind me of my Pontiac 301. like the hub on the balancer, the timing cover to oil pan bolts, and the one backwards bolt on the timing cover, and lock washers on everything.. im enjoying watching this rebuild cuz it reminds me of my first rebuild.
I'm building a 45 pickup useing a 305 8 cylinder,,, not wanting fast,,just a good sound,and would rather have the better gas mileage,,,it's a 1986,,what's your thoughts? I respect your opinion
Pretty cool stuff! It seems to come apart quite smoothly. Interesting that the rods don't share crank journals but are offset. Probably to do with the 60 degrees block angle. Honda did the same with some of their v twin bike engines. For a twin it makes the crank more flex-able but for this thing it obviously doesn't matter.
I used to have a G.M.C. 3/4 ton 1963. I remember a commercial on t.v. where they bragged about how much water the water pump could move. They (G.M.C.) had one of those water pumps hooked up to an electric motor. The intake hose of the pump was in a built in pool. I don't remember the time but it drained that pool quick.
I'll be joining! I love your channel here! I've been out of the motorhead life for 20+ years, but I get on to youtube to just listen to V8's on dynos. lol
Looks like a Pontiac overhead cam 6, pretty sure I see the front cam pulley for the belt. It was a John Delorean project, they could be ordered in tempests and firebirds but cost about the same as a V8 so most folks ordered V8's as they seemed more familiar at the time.
I was thinking of the Cosworth, but I don't know who made it. The guys below hit it I think. I went to the Pontiac Dealer when that Pontiac slant 6 came out (yes slant 6) in late 1966 and they let me take one to test drive!!! Oh boy, was that fun!! It was a Le Mans and it smoked the tires from every stop. That was cool :--))))))))))))))))
Coswoth was a couple of guys who combined there last names Mike Costin and Keith Duckworth to form an automotive engenereering company in the late 50's these guys were British and they were in business specifically for Formula 1 racing they were the pioneer's of 4 valve twin cam race heads some of there stuff was adopted by automakers there was a Cosworth Vega that had twin cams and 4 valves per cylinder back in the 70's the Pontiac OHC 6 was designed by John Delorian
I wish GMC would rework these engines for modern truck use. Like aluminum heads that have better chamber design. of corse they would need to make it fuel injected to help it pass emissions. They would make more torque and rev higher while being bullet proof. They would make buying a gmc actually mean a different truck than a chevy.
I love the commentary a very interesting history on these engines. Your microphone does a better job of picking up your air impact than it does your voice. Those pistons look like paint cans!!
The type of motor that you have under the green towel is a Pontiac overhead camshaft that Pontiac made in the sixties. I know because I had a pontiac firebird with this motor.
The "harmonic balancer" was only a timing ring. A balancer was not usually fitted, as it wasn't needed. If I remember correctly the 351 still used a timing chain, at least on the earlier models; but the 401 and 478 had a gear train(at least, in 1964 for which I had the manuals). I also seem to recall Dad's 305E using the water pump from a Pontiac. My 1964 305E distributor also didn't have the dwell window; it was similar to the straight-6 distributor.
What caused the pistons to rub? How do I prevent this from happening? Could you have just turned the pistons around 180 Degrees, and re used them? Why not?
We had one of those engines in an old 63 three quarter ton Chevy Man it pulled like a Bull ran good never seen it before or after in my life but the valve covers were Red yellow and black plaid like a flannel shirt wasn't paint I don't think but was different than anything I'd ever seen .
Excellent video! I will be subscribing and watching your other ones. I have a '65 GMC 1/2 Ton pickup that I am taking the 305 v6 out of. Everything is there, down to the carb and oil bath air filter. I also have the 4 speed manual transmission too. I really have no interest in keeping it as I want to build a cruising truck and not a stump puller. Would you be interested in it? Or any engine parts? Just thought I'd ask. Hate to see it just go to scrap. Thanks.
No the parts are just to hard to find there will be quite a few people interested in it if they need spare parts I would try and ebay it you will probably get a pretty good price
Hi guy, Love your channel by the way. My guess for the covered engine is an inline Pontiac OHV sprint 6 cyl. engine I have only seen a few and never heard one run yet. They always came with a very cool alum. valve cover. Didn't this engine come as an option for the Lamans or GTO one year?
Let me tell you something about these engines. The PCV valve is under the valve cover. It goes straight into the intake runner. Plug it. They are bad about sucking the ball out of the PCV valve and the ball going down and hitting the piston. Find someplace else to put it. I take them off and make a road draft tube like the old engine. I vent one valve cover and make a road draft tube on the other valve cover. At least make a screen so the if the ball comes out the screen will catch it. water pumps are the same as a 1958-60 389 pontiac, if you can't find one.
Quick question about a stroker for a 454. Is it possible to get a 4.25 crank and get a set of 6.385 connecting rods and run a standard bore size stroker piston? Do they make them? I've found many 496 kits but only have .060 over bore and my cylinders are perfectly fine so I don't want to have to bore it. I've got 781 heads also and if stroking it bumps up my compression ratio a bit that would be fine because the cc calculator says I'm at 8.3:1. Also it has a l88 solid flat tappet cam and lifters that I really want to keep, would I have to switch to a different cam to avoid clearance issues? Thanks! Love this channel. Been in the shop since I could walk and love learning about engines here!
I am not sure if the 496 pistons come standard or not I have never done one with a std bore you always need to check the clearance when stroking one of these
Myvintageiron7512 okay thank you for the input! I'll have to keep searching and will definitely check all clearances possible. Keep up the good work and I think the paid subscription and giveaways are a good next step to take!
There are cams available on Ebay, last one I price was $250. Lifters are the same as 235 Inline 6 solid lifters. Rod bearings are available from O'riellys or Summit Racing. Last I checked Clevite no longer makes them, I had to get mine from Sealed power. Main and Cam bearings will have to be purchase NOS. Rings are still available from what I know. Finding .010 under mains may be a bit of a chore. Yes the 305A-D engines had 4 rings on the pistons. The later 305E engines had 3 ring.
I've been watching your videos for quite a while now I really really like what you do I'm glad you're back you were gone for a while why don't you give us a chance to come work with you as well your prices if we sign up and learn something from you thanks a lot
darn this think needs a small 2 small turbos efi ../may be may be leave sock or even new custom metric small rings on pistons n be neat to do with theses new aluminum rod bearing bet i last a long time in a 1966 c30 roll back or wat ever
Your mystery project might be a 1965, 230 CID "cammer" first used in the 1966 model Pontiac Tempest. They were also available for the 1967 Fire bird as the "Sprint Performance Package." A very rare car. It was designed for Delorean to power a swanky coupe that never made it off the drawing board.
i have owned 305 v6 but thought it was a dog then i got the 351 m and that is a good motor lots of bottom end power use to pull td7 cat over mount hood all the time
The Pontiac 1966 through 1969 OHC-6 straight 6 engine. The 1966-1967~230/250~1968-1969/1970-1/2, four-barrel engine called the "Sprint". My only question is, did you get the super rare and experimental 1969/1970-1/2 special OHC with the Hemi cylinder head that made 325 hp?
The engines you do in all your vids are always very interesting. I know the channel is called myvintageiron, but you should try to do some more recent engines. I'm not talking about LS's really, but a 5.3 truck engine would be a cool rebuild, and people always want those. Ever thought about doing vids on Modular Fords or a Magnum V10? With my luck you probably already have vids on both those.
They have lock washers to keep it together. These are vibration machines. Had to fix a bus along side the road because the carburetor vibrated apart, had a 305 V6 in it.
And that big ass water jacket and big W/P impeller turned a lot of coolant that kept the oil cooler and I bet you will be telling us that this engine held a lot of oil.
Hey, I have one of these motors in my 63 gmc and was debating on whether or not to pull the motor and rebuild it but heard parts had hard to get. Where did you get most of your parts at? And how difficult was this rebuild compared to a chevy 350?
Not trying to answer for the channel owner, but I thought I'd share my experience with you. A 350 can be picked up as a crate engine for about $2K and then you'd have to purchase more parts from there. I rebuilt my 305 v6 minus a cam and rings for under $1000. Parts were a bit of a chore to find, but people make things look way worse than they are. I think people are just lazy. Parts that people are saying are tough to find only took me an hour of searching at tops. Most of the parts you'll need can be picked up at O'reilly auto parts. Cam and Main bearings will have to be found NOS. Rings May be available, I'm not positive. A set could be made though. It took me a month to do a light rebuild or major service as I call it on my 305 v6. I pulled the motor, replaced the rod and main bearings, oil pump, ALL gaskets, clutch and pressure plate, repainted, did a 4 barrel manifold mod, dual exhaust, pertronix hei and I drive that truck 7 days a week! Looking back I wish I had done rings, but since I am restoring a different truck at this time they were out of my time and price range. Who cares....engine had 120 PSI last I had checked which is only 5 psi under stock. A maintained 305 v6 will far outlast any 350 chevy, and will get good mileage with a proper tune and gear ratio.
you can get most of these parts if you spend the time to search it will be more expensive than the 350 parts but it's makes a much better truck engine than a SBC
Alright thank you. Where could I get a manual for like torque specs and things of that nature. I work at O'Reilly's and did some digging and found a few things but like pistons and things like that are gonna be a problem I feel like. If mine are bad or something. Haven't tore into the motor and kinda debating on it or not.
Pistons being bad is rare on these engines, there are lot's of 305 v6's out there so finding a good used set would not be hard. Rings you could try summit racing. Lotta NOS stuff pops up on ebay. I also go my manual from ebay....though it's Not the same year range as my 305...the specs are the same. It's the 60-61 manual so it shows the 305A specs, but the torque specs are the same for a A-E series. Just go to ebay and look for the 1960-1961 GMC Trucks Maintenance Manual X-6023. They do have 63 year manuals to so you might look for a year specific. Hope this helps, feel free to PM me with any future questions during your possible rebuild.
Looks like the first version of LS with the size of them intake ports and certain design remind me of the LS engine I've had too many of them V6 is back in the day you can even get in with plaid valve covers
Second video of yours that I have ever watched. Haven't checked out the channel yet. Engine under the towel, my best guess would be the Pontiac Sprint Overhead Cam engine. Don't know why I am thinking of it, might be because of Steve Magnante talked about it a bit a month or two ago? Well, time to go see if I was right, or just how wrong I am! Edit: Knowing that I am 3-4 years late for the party on this guess :P
Did you see the GMC pickups that have a 600ci V12 (which is, effectively, two of these motors bolted together) ? They only made a handful of them in the early 60s and they look really odd with the extended cowl.
702 V-12. They are not two engines bolted together. They look like it but they are not. One block 4 heads One crankshaft one block. The're like two 351 put together but they are not.
I never said they ARE two blocks bolted together, what I should have said is that they APPEAR to be bolted together. Were these in the big trucks at all before they tried them in the pickups?
No they came out in 1960. They did test them a lot. One add used a 304 pumping water into a swimming pool using the water that was going through the engine water pump.It was telling how good and how much water goes through the engine.
I have this motor. If you align the circles that are stamped on the gears, the chain and gear pull straight off. Helps with putting the new ones back on.I recently had to replace the cam.Found the cam online at Kanter.com
No, it's not a romantic hot-rod engine. But who ever designed this thing did a brilliant job. I think he was a Diesel engineer that was asked to conceive a gasoline engine that could produce respectable torque.
On your water pump I wouldn't be surprised if that water pump was common to some Pontiac engines. It look a lot like the water pump on my '63 Pontiac, it however was an oddball as I had a time getting a gasket for it and that was in 1977. It is a shame that GM didn't /wasn't able to capitalize on this engine. It was a heavy low RPM high torque engine designed for medium duty to heavy duty trucks. Ford had a similar engine series in their Super Duty V-8s from the 50's and 60's, as well as the International V-8 truck engines. In the long run diesel engines came to dominate the industry and the big gasoline engines went the way of Dinosaurs. I've seen these engines in GMC pick-ups, school buses and my Dad delivered roof trusses in a GMC semi truck that had the GMC V-6 gassers in it. This would of been a good engine for Motor homes and agricultural equipment, however many of the manufacturers that needed gasoline engines found it more economical to source Chevy 292's or even some of the V-8's. I suppose they could of worked with one of the ag equipment manufacturers and tried to get these used in tractors and combines in lieu of some of the Perkins or Waukesha engines some of the shortliners used. In the first episode of this engine your were talking about the massive displacement of each cylinder. Have you ever dealt with any of the 2 cylinder John Deere engines? They made a two cylinder gasoline engine with 412 CID displacement.
LOL did you see that when he rolled it over to get to the lower end! It really did look like a diesel... a lot of metal! The short block must weigh 500-600lbs.
the roadkill event is going to happen Jan 13th and 14th if anyone wants more info you can go to their Facebook page and David Freiburger give more detailed information of the events
