cam degreeing kit?

dodge freak said
More exhaust duration does help peek H.P. and let the motor has more power after its tuned RPM range. But most of the time low and mid range power will be lower. The motor may get less MPG too.

The intake manifold needs to be flowed with the head to see the ratio difference from intake to exhaust.

Best is to try both and see what happens. Heres a quote I copied from speedtalk...

I've had good luck with some street engines using single pattern cams. These are usually 550 hp type pump gas motors with full exhaust. What I've found in those applications is that extra exhaust duration just causes more problems than it solves. My guess is the back pressure from the exhaust system causes more problems on the bottom end of the torque curve than the extra duration solves on the top end.

I did some dyno testing a few years back and the best cam was a 40 year old single pattern design from Mopar Performance. It worked better than the whole box full of "new" cam designs that Comp sent me. All of the Comp designs were split pattern cams but none worked better than that old school Mopar cam.
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Andy Finkbeiner
AR Engineering

There are allot of differing opinions on this subject. I have read several that show where dual pattern cams work better and only a few that tout the single pattern cams. You are right about a single pattern usually has more low end torque. When your running a 3,000 plus stall converter though low end isn't as much problem.

The guy that I took my heads to when I got them done porting flowed them and he has a $2000 computer program that is supposed to be a "know all" program. Not your everyday Desktop Dyno program. He also believed a dual pattern would help mine from the info on his program. I realize a computer program is only as good as the one who wrote it and the user but he has also had a considerable ammount of experience building race engines and tuning them on a dyno. He showed me dyno print outs of a few different small blocks that make 600-800 hp.

When I first put my 360 together I put a straight grind Wolverine cam in with 224 @.050 and it was'nt all that hot. Sluggish out of the hole. Top end was ok but not as good as the next 2 cams but then again they are larger. Then I put a Comp xe274 in it. It ran much stronger throught the whole range but I had problems with lifters twice. They worked fine when I put them in but after awhile would start making noise on startup then finally got to where they clattered all the time. BTW: My oil pressure was 55-60 lbs. I read where comp had allot of lifter problems for awhile so I switched to a Lunati 60404 which has a much larger split in duration and lift than the comp but the intake is similiar size. The Lunati made alot more power down low but didn't seem to have any more top end. It also gets 2-3 mpg better even though it has slightly less vacuum. Go figure.

I never dyno'd my results. Just went by seat of the pants feel and how I had trouble getting it to hook up with the Lunati compared to the Comp and Wolverine.

Again these were just my results with only a butt dyno. So to sum it up this is just MHO

I don't by any means claim to be a engine guru. I feel my head flow tech is though after talking with him and seeing his results.

Have a good day.:-D