Quote:

This article has more cam testing that I did with that engine.

http://www.compcams.com/Community/Articles/Details.asp?ID=-1849542054

(all of these articles are in the tech archives on this board)



Good article Andy. What are the piston specs, head volume and gasket volume? The article says 10.2:1 compression, but I though the first article mentions a zero deck height flat top piston?
My assumptions were:
Bore=4.375"
Stroke=3.875"
Rod Length=6.760"
Block Deck height=9.980"
Piston compression distance=1.283" (zero deck?)
Piston valve reliefs=4cc ?
Felpro 1009 head gasket (4.410" bore, 0.039" thick, 9.9cc volume)
Cylinder head chamber volume = 84cc (as advertised by Edelbrock?)

Anyhow, with the above I calculated 10.76:1 compression? What specs, or combination of changes resulted in the lower compression ratio?

Just curious, because I am trying to figure out a cam for my 4.25" stroker 440 (505") that I may run manifolds on.
I have been looking at using a hydraulic roller because the engine may sit for months at a time between being driven, and I fear wiping out another flat tappet cam.
I have been considering the Comp highlift magnum profile #3122 (290/236/160,@0.006/0.050/0.200"), 0.608" lift @ 1.6:1 ratio for the intake (looks pretty agressive with 160@0.200"?)
I havent decided on the Exhaust lobe yet, I just started on this awhile ago.