Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - how much hp does a stock 454 oval port push?
View Single Post
  #9 (permalink)  
Old 01-03-2013, 01:23 AM
cobalt327's Avatar
cobalt327 cobalt327 is offline
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Posts: 5,031
Wiki Edits: 1616

Thanks: 128
Thanked 616 Times in 565 Posts
Originally Posted by Dean Pearson View Post
I have an 85 454 out of a suburban I plan to use in my Studebaker project.
It has cast iron rectangular port heads and the rest is stock.
What will give me the most bang for the buck as far as bumping up the H.P.

Thanks ,

What's the casting number of the heads? There are small and open chamber rectangle port heads, this will have a big effect on the compression ratio (CR). Also, what size is the piston dome, or a part number? Or are they flat tops? Do you have the heads off? If you do, measure how far down the deck of the piston is at TDC.

Reason is, you need to know what the CR is before you can choose a cam that will work the best for you. If you have FT pistons about the most CR you're going to see is 9:1, that's with 100 cc chambers. 8.5:1 w/108 cc, and 8:1 w/118 cc. You can get away w/less CR than a SBC, but you can't go too radical w/the cam timing before you start to lose bottom end and the off idle and low end response gets soggy.
Reply With Quote