Getting ready to do a cam / head install.
What's the pro's and con's of getting a cam grinded with the lift I want using the 1.5rr's versus getting a cam grinded with a smaller lift but using the 1.6rr's to get the desired lift that I want.
The only thing I can tell looks like the 1.5 would be a little easier on the valve train.

Any thoughts?

 

The same valve lift with 1.5s would be a little harder on the valve train than with 1.6s. The cam lobe would have to be 'steeper' (more lift per degree of rotation), and the lifter and pushrod would move farther, faster and create more force for the springs to manage.

With the 1.6's only the valve, the parts attached to it, and a portion of the rocker arm move the full amount. Theoretically you'd need a little less spring force with the 1.6s.

If I knew what lift and duration I needed (the most difficult part!), I'd go for a cam that gave me those numbers with 1.6's instead of 1.5s.

 

Whats the matter Ken, car's not fast enough for ya??

 

It depends on what you are looking for Ken. I am running 1.6s on the intake and 1.5s on the Ext. This gave me the lift I wanted with the cam I have.

Like mentioned if you pick a cam that has the lift you want with the 1.6s you will have a cam that is easier on the lifters. The springs will not care either way. I would stay away from the CXE stuff. They tend to be peaky and hard on parts.

I am running a GM #847. This cam is almost identical to GTPs GTP6 only cost $200 less. Oh yeah and it has been around for about ten years With my split rockers I get .575 lift on the intake and .565 on the Ext.

Before I had the heads done I dyno'd 348.76 RWHP and 407.17 RWTQ. After I had the heads done it dyno'd at 392.72 RWHP and 421.89 RWTQ.

I picked up 44 RWHP and 14 RWTQ from nothing more then having my heads done. This was with out any tuning at all between tests

Good luck man and choose your cam wisely

 

That's right, need more speed.

OneFlyn95z28-
Still trying to decide which cam to pick from.
Need something where the torque stays about the same RPM maybe a little higher and maybe not have to turn the motor as high maybe about 6500.

Just trying to look at this at different angles, so many options.

Thanks for the response, if you have any more input it will be appreciated.

 

Ellis-
What is the part # for that cam that you run?? Sounds like it makes some decent power.

 

Hey Ken good luck with the heads and cam install..Seen your post and thought I would say Hi...

 

The number is GMPP #12370847.

It made 422RWTQ at 2,700 and had a slow tapper to 300RWTQ at 6,900.

http://groups.msn.com/WashingtonFBod...to&PhotoID=439

It Feels good

I would look at at 230/236 CXE billet core cam ona 112 LS

Good luck Ken