phenyxTA

I'm running the R1 in a stock shortblock car with just mild headwork, and stock valves. I gained 57rwhp compared to the T1. I would think that a bigger cube motor would gain even more from a bigger duration cam. The car pulls hard all the way to 7000rpm which is where I have the rev limiter set. Any higher would pretty much be suicide on a stock shortblock.

MEAN LT1

iTrader: (2)

Look at some of the blower/n20 cams some of the bigger tuner compnies are using. I know im an lt1 and your cam profilw iwll be different from mine but it wont look too much different. I have a 224/236 cam on 114lsa. I have about 3* of overlap on my cam which inst a whole lot but it will do. Im sure some of the tuners will help you out. I personally like thunderracing.

CHRISPY

Overlap is more a function of LSA than duration split between intake and exhaust.

The added exhaust duration is necessary as the intake charge is forced. (positive pressure) The exahust side has to have more duration than an NA grind to help evacuate all the gases.

You will lose a bit of boost from efficiency increases but make much more power. Boost is only a measure of restriction not HP.

With 114LSA your overlap will be fine. With the 236/244 split duration you will be maximizing the intake and exhaust valve opening/closing points for max power between 4000-7000rpm.

If run too narrow an LSA you can run the risk of pushing the combustion charge out by the exhaust valve or worse into the header. We are talking pretty narrow LSA's though 109-110 etc.

Cheers,
Chris

BIGBOS

So I've got two choices I've come up with...

236/244 .565/.575 114lsa with advance ground in

or

230/240 .560/.570 114lsa


What to do, what to do....

MEAN LT1

iTrader: (2)

I think both of these cams will work good for you but I would personlly choose the 236/244 on a 114. Speed inc had a good article on cam swaps when they were building there 1le ss. They went from a cam simaler to the 236/244 on 114 to almost the same grind on a 117 and gain like 5-7psi of boost

BIGBOS

The Speed cam I posted above, they took out their 244 cam, and put in the

226/234 .598/.599 117lsa cam

Would I be better off running this cam....

117 will want to rev high, would I be better off running this cam on a 114lsa?

CHRISPY

You could compromise and go 232/242 on 114LSA

CHRISPY

I would not run that 117LSA cam.

Cheers,
Chris

BIGBOS

Yea, I don't plan on 117lsa, thats way too high in the powerband for what I want to do....

But they saw GAINS removing the larger 244 cam and putting in the 226/234 cam...

I want to get the most I can get out of my setup at the current amount of boost....

BIGBOS

TTT

Pro Stock John

iTrader: (34)

You might want to revisit this with Speed Inc, I recall them picking up HP when they went to the 226/234/117 cam.

I'm running a 230/237/115 +2 cam for my smaller bore motor.

BIGBOS

Yea, I'm thinking I might do that cam, its had success in other cars as well...

BIGBOS

TTT on this....

It looks like I might just be tuning the car with the 214/218 cam, and seeing what I can get out of that on a 100oct. tune.....at 12psi

mike m

iTrader: (6)

i too am looking into a different camshaft, i am only a 346 though, but i have heard of a 236-240 in the 570 lift are on a 116 making some serious power. if anyone has a comp cams catalog the specs are in there.

Pro Stock John

iTrader: (34)

IMO I would get the belt/blower alignment issue revolved, dyno the car with a 11.5-12.0 AF at WOT, and see where it peaks. Let's see what your RWHP and RWTQ look like. If we can get 600rwhp with the cam you have I say run it like that for a while.

BIGBOS

Yea, thats what I'm planning to do....

Hopefully I can get some good HP....