Small Block & Big Block Chevy Specific - 1990 454 ss

Hey I'm looking to remove the peanut port heads on the big block will anything older work. Don't want to spend a ton just change compression without doing pistons. If possible keep the TBI on it now. Thanks for the replies and help.

I think the heads are different from the old ones, i have never messed with the newer stuff.

All the 454 SS trucks used blocks compatible with the earlier heads so any will work. Just avoid the Gen 5 and 6 stuff.

Kerry

I have a set of 4291 heads but with the 113cc they will drop the compression to much its low now. I think its like low 8's its say 8.5 but some say as low as 7.9 range. Thats why I was thinking of smaller cc heads. Thanks for the replies.

R

The big block heads changed in 1992, thats when they went to GEN V. They can still interchange, but you don't need to worry about that.

I increased the compression on mine, and went from peanut port to large oval and it made a huge difference.
I even kept the peanut port TBI intake. Everything bolts right up.

If you want a better intake to go with bigger ports you can either get a carb intake with a TBI adapter or get the edelbrock TBI intake.
The edelbrock has small ports but enough material to open them up, it'll take a good day to port one to large oval size too, it's a lot of work.