Quote Originally Posted by DwayneD View Post
I'm building up an old 429CJ motor that is destined for an FFR Cobra kit car. 429 Pistons that will make a pump gas friendly compression ratio are hard to come by since I want to use the stock D0OE-R cast iron CJ heads so I am considering putting the Eagle cast 460 crank in it and Eagle I-Beam rods. 460 piston selection is much better than the 429s and I am looking at the Probe P2404F's or the Speed-Pro L2404F's forged pistons as they should get me around 9.5 to 1. It had already been bored .030 over and .040 wouldn't clean it up so it is going to .060. It came with an Offenhauser "Dual Port" intake on it with Holley 650 double pumper. The question I have revolves around cam selection. I'm not looking to build a Viper slayer here but I'd like to stick with the original valve train if at all possible so looking for some guidance on lift/duration that will work well with this setup. I also know the 650 Holley might need to be upgraded to a 750 or more in order to make it breath. Also wondering if anybody knows the stock push rod length for this motor? Any suggestions would be greatly appreciated.
The OEM 460 crankshaft is fine for your application; we have used them to well past 1000 hp. OEM pushrod length is around 8.55", but that dimension is out the window and you will need to re-optimize valve train geometry once you have selected a cam, valve springs, etc. Also the exhaust pushrods will be a different length than the intake pushrods. Be aware that if you want this engine to fit underneath the Cobra hood without a scoop that you will be limited in intake manifold choices.

Camshaft selection: How much horsepower are you targeting, and what do you want the peak rpm of this engine to be?

Paul