Comp cams xe268h for 318

Wyrmrider said

if you have low compression look at a voodoo or Howard with the (15) footnote and think about using one size shorter cam and you will find more lift anyway
cheers

Click to expand...

Dang wyrm..... you just helped me out. I had never looked for a catalog download from Howard's.. I just looked at the online offerings. When you mentioned the (15) footnote, I was scratching my head over that, but FINALLY saw the catalog download. Looking in the SBM flat hydraulics cams, I saw the 15 footnoted cams.

That makes it pretty clear about the .904 lifter cam lobes. Looking at a non-15 footnoted cam with intake duration of 269 and .050" duration of 215, lift is .455"... the normal standard stuff. Now looking at a 15 footnoted cam with intake 265 advertised duration. .050" duration is 218 but lift is way up to .502.... that is QUITE a difference. Even if the heads don't flow any more at .500 lift than at .450 lift, they still will get to peak flow faster and hold it longer. Better than a VooDoo or XE.

It creates a new problem of how to accommodate all that lift in a simple build. Guess you back down to the 255 adv. duration one, and still get the same lift as the 262 VooDoo... same lift, maybe a tad less area under the curve so the top end is a few HP less but low end torque is up a bit. OK.... now the note for that 255 cam of "Best in 273-318" makes sense!

I am pretty good at digging into details but I missed that one altogether up to now. Thanks for bludgeoning that into my wee brain.