Quote:
Originally Posted by north
btw no apologies required for the engine mod takeover of the thread, I'm doing the engine in my Bonneville convertible as we speak, 428HO with original 62 heads but I swapped in a 455 crank and cast pistons that result in 9.5 compression. I can't think of the brand but the cam is basically a 067 but with greater lobe separation to address octane concerns, I've run the same cam in a 400 with similar compression and like how it runs and sounds. We have 94 octane here but it has ethanol so we have to run 91 octane to get pure gas.
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North, the Summit 2800 is similar to the 066/067 cams 204/214 vs 200/211 at .400"/.422" vs. .410"/.410" ground on a 112 LCL. If it isn't too late, you should consider the Summit 2801 cam which is 214/224/112 at .422"/.444" which will work with stock valve springs if needed. The 2800 will make a 9.5 to 1 455 a detonation machine and will need a very sharp tune to run on 93/94 fuel. I run the Summit 2802 cam (224/236/114 at .444"/.466") in my 9.9 to 1 455 (464) and even with 93 octane fuel, I have to run the best cooling system (alum rad., big vane wp and small pulley), watch the ignition curve, and jet on the rich side. I think the RAIV cam with Rhoads lifters would work better with my compression. I think the 2802 would help your driving situation and it runs and idles like a smaller cam, you would think you had an 067 in there. However, you would need aftermarket valve springs to allow the lift of the cam.
Dennis