Just freshened up the 454 in my 69 Convertible over the last couple of weekends. Didn't have the time to stick it on the dyno so am wondering if anyone can give me a theoretical on what kind of HP the following build spec will have.

454 - Std 4.25 x 4 bore and stroke
Std Crank and Rod diameters
50cc domed alumnium pistons
1/16 performance rings bore matched
113 cc Oval Port Cyl heads, ported and polished with new 2.19 / 1.88 valves and seats
268/276 Lunati voodoo cam with .542/.554 lift Intake / Exhaust
Hydraulic flat tappet lifters
Aluminium Roller rockers
Weiand 8005 Intake Manifold
1 7/8 inch head pipes to 4 inch collectors on 3 inch highflow exhaust system
750 holley double pumper

According to my calcs it runs about 13.7/ 1 comp ratio, I have it tuned to about 16 deg advance and it is running 98 octane premium unleaded fuel.

Can anyone give me a ball park.?

 

How did you come up with 13.7:1? It's quite possible with domed pistons, but you held back a couple of factors that's needed to calculate c.r. and h.p. You need to give your engine block deck height, compressed head gasket thickness, and head gasket bore diameter.

 

Good point. short fall on my part. Head gaskets are Felpro thickness compressed is 39 thou head gasket bore diameter is 4.37 Inch. As for the deck height assuming standard is 9.800 inch then the only mod is a 5 thou deck of the block and heads.

As for how i can up with it, when i was doing some research regarding the 781 heads and 7040 piston numbers, there was a page that listed theoretical comp ratios based on various combinations. If you could set me in a better direction i would be appreciative.