Quote:

Quote:

FWIW, I run the Whiplash cam. 229/242 at 0.050, 518 lift, 107 LSA. This is on my 383 with 346 heads milled 0.030, ported/blended, 3 angle valve job, stamped steel rockers. No other mods to the heads. Am using the same springs that I used with the Comp Cam XE262, the one that is recommended by Comp Cams for the 262. Running the Hughes lifters with the cam. The engine runs strong to 6000 RPM. May go higher with no problem, don't know, that's where is shift.



Okay, again i am confused...

Just comparing Comp cam/springs to Comp cam/springs here and leaving Hughes outta this...

The springs spec'd for your XE262 cam (either set, there are two options) are stiffer/rated heavier than the springs spec'd for the Comp cam XE275High-Lift cam i bought my springs for. Shouldn't a considerably stouter cam need stouter springs...??? Something's amiss here.

Either way, its looking like a possible go. Not optimal... but doable. The springs i have were spec'd for an aggressive ramp lobe (again, Comp XE275HL - 231/237 @ .050 and .525"? lift). In fact, ALL the high-lift Comps 'recommend' that spring, even the XE295HL (251/257 and .564" lift).

i think i'm overthinking the original question now... especially seeing how well some seemingly mis-matched combos work, but now its the spring recommendation questions that have me wondering. Anyone...???


All I can tell ya is what I've done and learned. I'm running the recommended springs for the XE262. If you look at the Comp Cams web site, at the XE cams, you'll see they post part numbers for lifters and springs and stuff for each cam. Look at the springs part number for the XE262 and you'll see that it's the same part number for the next two larger cams (maybe it's three larger cams, I can't remember) which are "bigger" than the 262.

I called Comp Cams and asked them questions concerning that particular part number and told them what cam I was going to install. They told me no problem.

So I left the springs on the heads and swapped the cam. Engine runs great. I've taken the engine to 6000 RPM many, many times now. Buzzes right up there. It loves it.

BTW, I forgot to say that the pistons (flat top) are 20 in the hole. Also run the steel shim head gaskets.

Call Comp Cams and talk to them.

2010 Black Challenger SE <> 3.5 V6
Custom Shift Knobs www.flameball.com Check It Out