454 Build Questions

[Tom Fox]

I recently picked up a 1984 vintage 454 from a motorhome with only 60K miles on it. Pulled the heads and the bore look good but a little surface rust from sitting!! I still see a little crosshatch on the cylinder walls. I may yank the crank and pistons and give it a quick ball honing and put new bearings and rings in....

Anyway...the heads on these are those wonderful tiny peanut port ones..They are now under the workbench!

I picked up a set of PROCOMP (I know..but the price was right!) Aluminum heads PC3021-396 Closed Chamber oval port heads to use.

I also got another screaming deal on a complete COMP CAMS Mutha Thumper ROLLER cam kit cam #11-601-8

I also plan on running a tunnel ram on this motor as well.

This will be in a 2800lb sedan.

Comp cams says the cam works best with 9:1 compression...I'm pretty sure this motor was 7.8 or 8.1:1 from the factory. By using the closed chamber heads I'm sure compression will go up a tad...Think this combo will work decent?? Should I just go for some compression with new pistons while its apart?? The car is just in a Saturday night cruiser. Thanks!



-Tom

[pat mccarthy]

the chamber size i have only seen with the pro comp stuff is 120 or 115 cc chamber head? i would have to look your number up. i did not do that but . you will need a small dome for the cc of the head chamber to get to 9to1 . head gasket fire ring size and if in the piston are in the hole abit that plays in to it as well .with a flat top with a 3cc valve cut your going to be 9.7 @96.5 cc ..8.4 cc @115 cc and 8.2 @119cc .so if the new pistons in the hole about .010 and head gasket is 9.5 cc .039x4.370 bore =9.5 cc with a 18 cc dome piston like icon #ic779 .190 dome you will be at 9.3 . so no them heads will not work with flat top as they are for 9to1