Back in 1998 I built a 12.5 ls7 454 short block and installed merlin 269 iron oval ports, everyone laughed at me when I removed the iron rec ports. 12.5 compression Merlin iron oval ports I ported. Ultradyne solid roller. 263 271 660 680 108 lobe sep installed at 103 Dart oval port 1050 Dom. On a stuska dyno it did 726 hp and 640 torque. Hp peak was 6800. Car went from 10.60 at 128 to 10 flat and 136. The good old days, I ran that engine for ten years on street and track.
I'm late to the party But I'm getting sick and tired of people discouraging others from wanting to use older steel heads. It makes me assume that they DID NOT have exposure at a young age to the older stuff. I'm about to pay $1500 on some 990 heads. The main reason is that because as a 16 year old I was blessed enough to ride in a gold class show car that had an LS7 in it(no kids..not an LS) It's about feeling some godd emotion to go along with the highs and lows of tinkering with these old.hot rods. Also, for anyone reading...PLEASE don't toss the steel heads out. Sell them to us ..or better yet...use them yourself. ..you won't regret it Thanks
More the keyboard builders post the more it is obvious they dont know jack. THis is a great street combo good torque curve can drive every day! Makes more torque than the GM 350hp cam too. Dont think anyone here is gonna teach mark anything haha
Great job on Videos always awesome. I would still like a real comparison with same valve diameter to have a real life gain on porting without changing the valve side or even and or, change valve with no porting and flow to see the gain. These are just suggestions I would like to start porting heads I watch videos but I think I would start with someone with experience by my side! Thanks again and keep doing your great job!
I just picked up a clean set of 292’s for $200. They have good guides no rust pitting and passed the magnaflux inspection. They still have stock valves and don’t appear to have had any work done to them. Are these heads good candidates for a performance build?
Pretty amazing power and broad torque with a smallish cam and iron heads. I really didn’t think it would pull that high with only 315 cfm available at peak cam lift Very nice work I build a lot of strokers myself!
Doing fixes seem to be the standard thing with pro comp stuff consistency in the casting and machining is always nowhere defiantly better to pay for the US made heads if you don't wanna mess around for average results.
I picked up a set of 1971 820's about a year ago for 100 bucks. Had them checked, everything renewed for another 150, I have no extreme build, but about 450 Hp with about 425 -450 ft pounds of trq.
Picture looks like you plugged the oil filter Bypass I personally would never do this because A big block engine bypasses oil anything over 2500 Rpm!!!
I know this post is older I bought an 89 camaro with a 327 stroked. 30 over 11to 1 pistons and hydraulic roller cam. Honestly it's plenty of power it rips I have edlebrock proflow efi I'm obsessed with this car I make excuses to drive it 🤣 anyhow plenty of power enough to have fun!
Putting k lines in new cast iron guides seems like extra work to me, i would have just put in thick walled bronze guides in, only thing i can think of is he probably didnt have any or possibly the right size bronze reamer as they are different for cast and bronze.
Wow so many commenters still didnt listen to what he had to do . Junk save up and buy some real heads or Marks worked irons Bet the owner spent more in the end than if he bought some afrs. And would make more power for sure. Dont lie to yourself...lol
