Hey Eric, I appreciate the matter of fact way you lay out the results, that's what I like to hear. I ported that head about 4 years ago, before I knew how important the valve job is. I'll email you on the cost of a proper valve job, for the I & E, and maybe I'll have you run them again! Thanks for making this service available, I learned alot, and I feel validated on my understanding how gases flow out of the exhaust port
Eric, David vizardndoes say to lab in the valbe and make sure the contact area is the correct width if that helps any. That and he does that after the valve job. He wouldn't do that if it didn't make any more hp knowing how he is.
Forensic patholgy of some "my buddy" work, nice, I bet there was some initial looking over, some *WTF!* moments, and then a "This will make a good RU-vid vid" and honestly, it's my favorite kind of content. It really reaches the guy who needs to get in his garage.
The valve job vs. grinding comparison was definitely revealing. Myself, I’ve always considered the valve job to include the throat and the top cut to include the chamber walls adjacent to the valves out to the bore line, for anything beyond a basic valve job. Thanks to you and the victim, for sharing. Hopefully he continues to develop his skills. You need to emphasize, that the skill and art in this, is being able to repeat the exact same things across eight cylinders. A grinder / bur is a subtractive paint brush.
30 years ago when I did a few bracket engines the cam I used 99% of the time was a Cam Dynamics 284 iirc. CD had been bought by Crane sometime earlier. Iirc it was 234* at .050 and 480 lift. I could buy the cam and lifters wholesale for $89 :). I never had one fail but I did have a test stand and my cam break in regimen was 2500 + for 45 min. Then let the motor cool overnight and the next day retorque the heads, warm it up, hot lash the valves and it was:ready to go in the car.
Excellent video sir. All in all, after his pocket porting work which did result in increases in CFM after .300, a good valve job should have brought the initial low lift numbers back into Respect City. Very informative video, confirming a bunch of things I have learned in the past, and enlightening me even more in other areas! Thank you again!
Good video Eric. The guy did a pretty good job. I like your emphasis on a good valve job and the importance of having one. Thanks for sharing. Take care, Ed.
great video and I love the way you critic the work. open honest feedback is the best way to learn without ridicule. and you did not make fun of his work or say he sucks ot anything like that. so very good. I know it would be a lot of work, but personally i would like to see what one of your valve jobs actually does to his work and see the actual numbers instead of a comparison to someone else's work. I don't expect it to be much different. but you cant compare someone apple to your orange and call the differences the same. you can use it as a prediction, but not a 1 to 1 comparison to show what a good valve job is really worth.
Thank you Eric for an awesome and informational video on a head an average broke guy like me can use. Ever think about analyzing a Pontiac bathtube head and what one would need to improve on it? Anything would be much appreciated!!!
Thank you so much for the information. For us overlooked people who can't buy good aluminium vortec heads for the 4.3 chevy v6....I know BRO..Made aluminum heads but not vortec bolt pattern and hard to find.
6:37 I have a cracked 062 casting that i plasma cut a big hole in the side of the head and the intake and exhaust ports are not solid there , they are however really close together so not a lot of coolant is gonna flow there confirming your cracking theory , the wall thickness is pretty thick so thats probly how a fair amount of material can be removed on the bowl side.
There is also 520/059/113 head casting for the 305 engine. They have 1.84 intake valves and 58cc chambers. They are vortec heads with the vertical intake bolt.
@@TIMEtoRIDE900 the 305 or 5.0l vortec heads are only down about 10cfm peak over the 350 heads. Its really small. Exhaust port and valve is the same from what I can tell. 58cc chambers will give you higher compression. It would raise the compression on a 9.4:1 L31 350 engine to 10.5:1
Very interesting. I think your critique is really good snd not harsh at all. Would be interesting to see what a valve job would do. Maybe convince the guy to let you cut new seats? I do like these videos so ggod säger ne 👍
Some heads come from the factory with 5 angle valve jobs...Dart Iron Eagle 230 as an example. Is it worth redoing the valve job on that style of head as well?
I have seen where they fill in the notch on the quench pad side of the intake valve with clay and the high lift flow shoots up. That little notch disrupts swirl at higher lift and makes the port go turbulent.
OOOO, great Video! i think i missed the first critique video but now i will have to go find it. This is tempting me to send something in as your feedback would be priceless. Question is, what to send...... I doubt you would be able to mount a big block Olds head to your bench, am i right?
You know, you can flow the head 1st before porting & then after porting to gauge your work, you can always put the VJ in afterwards. I know it's not the usual way of doing things but you can clarify your port work without a VJ
I'm thinking the guy did the 1 port in his garage and wanted to see the results before porting more, and planned on the VJ when the work was done. Note he hit the valve seat area and needed the work.
Eric i have a 317 ls head I would like you to flow but would like you to flow all 4 ports as they range from stock to more and more modified, and heres the kicker, I opened up the the seats to 90% using a hole saw.
Not only is their a difference in 906-062 their is a big difference is Mexican head vs factory head from 96-2002 flow more! If I knew why I know now I wouldn't of touched a Vortec head. A ebay aluminum head flows more than not only mexican vortec they also outflow factory head by a few numbers!
Lol I been grinding valve seat & flow test & port 32 years all my head so bullshit, you can do a valve job in a home shop 0.000 0.0005 Concentric I fix more seat guide machine work then any thing there out 0.005 0.010 always lol it called skill
I have a set of ported Mopar Performance heads I'd like to send in but I don't think he has the proper plate to flow them. Flow numbers are unavailable.
I would like to see the gains with a valve job too. I'm sure there would be even more gains on top of what he already got. Too bad he didn't have to do a valve job.
please make a vid on a worn valve job and with a drill lap the pee out of it like the how to hack vids do.,,flow then do a valve job repeat, cant tell those guys anything
