UDHarold,

I know that to properly answer this question, there are a lot of variables here. I'm just looking for a ball part idea, as I know Cubes/stroke as variables, has a direct effect on how a cam performs.
This Flat tappet Solid cam (see below) is listed on the Holley/Lunati Web site. The engine listed is not by Cubic inch, but just states Big Block Chevy. But no indications of which size, if I remember correctly. My question is this, the rpm states 2800 to 7000, but my guess would be that is rpm range is for a 396. As the 454 may only be (a guess) 2500 to 6800 or lower. How does Holley/Lunati rate thier RPM, on the smallest engine or mid size, etc in the listing?

Solid Good cam for 9.5:1+ CR engines, headers, 2800 SS or 4-speed. Power 2800 to 7000.
282 292 248 255 ..57 0.586 0.335 0.345 112 106 18 BTDC 50 ABDC 65 BBDC 10 ATDC 402A4LUN UF16 UF2 02-UF16-UF2-12-A01

Thanks,
Fred.

Fred,

I don't know how Holley rates cams, but I rated this one based on the 454, on which I rate all of my Big Block cams. A 396 would add another 250 rpm, or more, depending on the intake port volume.
The following is true for all engine families, where you have different displacements for the same basic block and head: Bigger intake port volumes RAISE the basic RPM band, longer strokes LOWER the RPM band. Obviously there are trade-offs when you increase the port volume and increase the stroke as well---Experience becomes the watchword.

UDHarold

UDHarold,

Thanks for the reply. I guess when your looking at a solid, I should possibly expect that it may be based on the Rect ports heads (depending on rpm range etc). Much smaller cams would most likely be the Large ovals, and smaller cams - etc. Matching the parts of the engine, this would make sense. Slowly this is all falling into place, and now makes a lot more sense.

Thanks alot,
Fred.