bsoutlaw32

Hello

Couple questions for the people that have built a few 460's. I have built a 547 ci storker for my 69 mustang fastback and would like to know what kind of hp I can expect to get. I started with a 1986 truck engine bored it .40 over with kb 402 pistons, these show to give 9.4 cr with 97cc heads! I used the stock heads off the 86 with stock valve size. I cleaned up all the ports and removed the smog bumps from exhaust port. I milled all the towers and installed screw in studs and added roller tipped rockers! I do all my own head work so no money wasted, just time! I plan to add better heads later that is why I used the stock heads. I have aftermarket 6.7" I beam rods with 4.5" stroke. Engine was balanced. I am going to use a Edelbrok performer intake toped with a 850cfm demon carb. Cam is by Comp Cams 34-341-4 Magnum solid with these specs

Camshaft Specification Table
Part Number 34-341-4
Engine 1968-1994 Ford
429ci-460ci
8cyl.
Grind Number FF 282S-10
Description

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Intake Exhaust
Valve Adjustment 0.022 0.022
Gross Valve Lift 0.57 0.57
Duration At 0.015 Tappet Lift 282 282

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Valve Timing At 0.015
Open Close
Intake 35 67
Exhaust 75 27

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These Specs Are For The Cam Installed At 106 Intake CL
Intake Exhaust
Duration At 0.05 236 236
Lobe Lift 0.33 0.33
Lobe Separation 110

I know the heads are the cork in the engine right now, how much HP and torque do you think and how much do you think I am giving up with these heads? Is the 9.4 cr about right on these engines for pump gas on a street car?

Thanks

Paul Kane

These big engines need a lot of air to breathe, and increased compression ratio helps this part of the equation a lot.

I'm going to take a wild guess and estimate 500HPas-is, but I think that your motor has more potential with a bigger cam, bigger carb, and well ported iron heads...all of which could add 80HP or more.

Paul

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