I told him I was looking at the High Energy 268H - Lift. 40 thick? Bore was slightly larger than the cylinder but don't know how much.I have looked at a few cam's and for the life of me couldnt figure out exactly what I need or want without hurting the performance of the car so I called Comp Cams support today for help This is from the manufacturer's data sheet water Can't remember now if they were 4 or 8 cc I think they were 8. Piston (+/- CC's for valve reliefs/domes) Flat top pistons with two eyebrows. The deck has been milled to 0' above the pistons. Here's more specs.įactory tolerances or set up more as a race motor? More as a race motor. I need to know size and PSI you are running. Total Lift and based on what rocker ratio Link to MFG's web page or cam card would be best but. *-* Tube length to collector (this can be your best guess, but the more accurate, the better) Type of intake (Single plain, dual plane, again link if you can find it). If these are stock heads, try to give me a casting or something) *-* Head flow numbers (Please provide them or a link to MFG's website, I don't want to have to search for info. Piston (+/- CC's for valve reliefs/domes) Selecting the cam based on you heads, goals, and RPM band are crucial.įactory tolerances or set up more as a race motor? One set of heads may flow killer mid/low lift where the other tends to flow a bit more at mid/high lift. Heads are going to make drastic changes to average/peak power outputs. Most the time I won't even put somones info in with out the info bellow. Although I don't mind a noticeable idle with some lope to it, I also want to keep the idle bearable.

Pro Lightning aluminum 180 Heads (Same cast as the RHS heads) with 2.08/1.60 valves Another significant difference is in the LCA. And although the Comp Cam has slightly less duration it has significantly more lift. 489/.504 LCA 110Īs you can see the cams are fairly close in spec. Going strictly on peak HP the X4270H makes more HP (417) but less avg HP and torque.Īdv 268/280 224/23 1 Lift. I'm curious to see how another dyno software package would estimate this.

The Comp Cam software says it should make 413 peak HP, 436 peak torque, 253 Avg HP and 295 Avg torque. Using the Comp Cams Cam Quest Selection Software the 268XFI H13 comes up with the best overall peak and average horse power and torque for my engine. I currently have a Comp Cams Magnum 280 but with the LCA ground on 114 and I think I'm rounding off a lobe.

I may be doing a cam swap in the near future and I'm looking over my choices.

77 chevy 350 270 magnum cam