VCuomo

Here's my setup:

383 stroker
Edelbrock aluminum 64cc Performer RPM heads
Edelbrock Air Gap dual quad manifold
Two Edelbrock Thunder Series 500 cfm carbs
1.5:1 roller rockers
Comp Cams roller lifters
Approx. compression ratio 10.5:1
M20 4-speed tranny
Standard/stock rear-end ratio (3.36:1 ???)
No air conditioning
No power brakes

The speed shop sold me a Comp XR276HR, which is way too wimpy (and getting lots of pinging/detonation). Before I rebuilt the 350 into a 383 (it's a ZZ3 4-bolt block), I was running a Chet Herbert hydraulic roller cam (243/243 @ 0.050, 558/558 lift, 110 lobe sep) which worked well (although I won't be using it anymore due to reports of premature cam failure).

Do you guys think that a Comp XR288HR (236/242 @ 0.050, 520/540 lift, 110 lobe sep) would be a good match for my setup?

Any other recommendations?

Thanks much!!!

Little Mouse

I would look for a cam with more lift, the 520 lift on the
comp cams intake is a little on the wimpy side.

Crower Cams high lift series
hydraulic roller part # 00471
.050 int. dur.236
.050 ex. dur. 240
adv. int. dur. 286
adv. ex. dur. 292
LSA 110
lift int. 555
lift ex. 559
power range for 383-400, 2400-5900

Crower cams phone # 619-661-6477 Fax # 619-661-6466

VCuomo

What the heck, I decided to call Comp and see what they suggest.

They said I should use their Magnum line instead of the Xtreme Energy line (XE's apparently have fast open/close ramp times which they said are worse for detonation than the Magnums). They suggested their Magnum 286HR (duration @ 0.050 is 230/230, lift is 560/560, 110 LSA, power range is 2500-6000).

Sounds pretty close to what you've suggested, Little Mouse!

Little Mouse

Go for the magnum much better lift then the extreme.

ajrothm

I think that Crower that LM posted would be a better match.. Thats a nice looking little cam.

Little Mouse

The chet herbert that you liked but are afraid to run now has
.050 duration figures closer to the crower cam then the comp
magnum. You may want to look at that as a plus for the crower
if you liked the power range on the chet herbert. If its between
the two comp cams the lift of the magnum would get my vote.
The power monger that I'am would pick the crower for the xtra
duration even if I had to change gearing when I could afford it.

VCuomo

I noticed that the Crower Cams catalog says "Small base circle cams available for 383 and 406."

Do I have to use a "small base circle cam" for a 383, or is it optional?

Thanks!

Little Mouse

The chet herbert cam had high lift was it a small base circle cam??
are the rod bolt heads ground down, do you have the rods that are
called stroker rods?? Crower says just add an S on the end of the
part # for a small base circle cam. You can play it safe and get the
small base circle.

VCuomo

Don't know about the Herbert cam (I doubt it was a small base circle cam, and I think Herbert is no longer in business).

Don't know about the rod bolts or if the rods are "stroker rods" - I can ask the speed shop on Monday.

C3 Stroker

This is the cam in my combo and I'm very satisfied with it. Of course, I'm always wishing for more, but it is a good combo. 3.90 - 4.11 gears would unleash its potential. I have good idle at 850 rpm with 12-13" of vacuum, nice lope, and 11.6s in the 1/4.

Little Mouse

The only thing I did not like about the extreme cam was the 520
intake lift thats seems a little weak for a roller cam.
magnum or crower both look good to me.

63mako

That is the cam I used. See www.ryanscarpage.50megs.com/combos1.html Combo # 17 is my motor. I went with a 114 LSA, AFR Hydra rev kit, a tripower and bumped the compression to 10.2 to 1. I like the lift on the cam, anything more has pretty radical ramp rates, spring rates increase and an overall shorter valvetrain life expectancy. Think your setup is well matched for that cam but the pinging is another matter. More overlap on the bigger cam may help bleed off some of your dynamic compression and reduce detonation so I would stay with the 110 LSA. Good Luck!!