Does anyone have a GMPP HOT cam .525 lift W/1.6s INT & EXH, with stock L98 heads and a stock L98 base?

If so does it run good? Can that combo breathe enough air?

Anyone with this cam please respond.

 

Not a great idea. That cam is made to create power higher than the stock tpi can handle. It'll probably make more power than the stock cam, but you won't get near it's potential. Especially without working on the heads--which will need new springs at the very least.

 

Thank you for your insight.

rezinn, do you think the TPI setup would be capable if the plenum were ported and it had SLP runners and a ported base, as well as the heads getting pot work too. Or does that set up, even modified, just not cut out to operate at higher RPMs. Thanks for your opinion.

 

I agree with rezinn on the fact that the heads are going to be worthless to you but I have a freind that is running the LT4 hot cam with the LTR setup and would be getting in the 12's if he actually had some traction. Now he is running the TF 23* heads so that is a huge difference.

 

I(1992 Z28) already have the SLP ported runners and ported the base some, with the LT4 hot cam(1.5 rockers) I run 8.2's on motor(1/8), I have about 1.7 60ft and run about 80-82mph.

 

The stock heads will need to be machined to accept larger springs, screw-in studs, and have the valve guides cut down to accept that much lift.
The best cam you can use with a stock TPI intake and heads is the Compucam 2032, and even then I would change the springs anyway. Manley makes a good set of 1.25" springs that will fit.

 

Are you talking about the stock L98 cast iron heads? I wouldnt fool with them personally. I would go with a set of aluminum L98 vette or vortec heads instead of messing with the stock L98 cast iron heads. Putting money onto the stock cast heads will be a waste of time and money in my opinion. I know this isnt what you were asking but I wouldnt mess with the stock iron heads. They wont flow to your satisfaction.

 

I disagree. The L98 cast irons can be ported and worked to flow as well as some of the better out of the box aftermarkets (IMO).

What I do agree with is that you MUST port/valve job your stock cast irons or get some better heads but there is no way you can keep them and fully enjoy an aggressive cam like the hotcam.

 

Portmatch the plenum to your runners, and buy an aftermarket base, while trying to get some reimbursement elsewhere for your stock piece. The stock piece can be worked, but it just wont reach the flow of an aftermarket piece out of box.

I would even go as far to portmatch the heads to the intake and exhaust manifold.

Im big on portmatching

 

I am currently trying to prove the L98 heads and cam from '89 and up are not as choked as everyone thinks.

In the spring, my car WILL RUN a 12.99 or better with the stock untouched heads and stock cam.

 

Thank you guys for your input. I think, because I'm building a house and that put a screeching halt to my racing budget, I will try to play with the L98 iron heads. I already have the HOT cam springs(not installed yet) and 1.6 GMPP roller rockers. Cam selection might change to suit the LTR setup before the project is over. Thanks again. If anyone else has an opinion my ears are open.

 

I'd go for it. Right now I am running the LT4 hotcam, TPIS zz9 STOCK diameter valve springs, stock pushrods, lifters, comp 1.6 rockers, intake style retainers on ALL the valves, and NO machining of the valve guides is necessary when running these intake retainers on ALL the valves! I do not have screw-in rocker studs either. I am running IRON L98 heads that I midly ported with stock size valves with a valve job. I am also running a siamesed STOCK intake base, STOCK runners, and STOCK throttle body. My car has other mods too, and I know it is NOT an optimum setup yet, but I figured I'd build the shortbolck first and drive it until I could afford better heads and a better intake. Right now with traction and better tuning it will run a 13.5 or better. I'm running high 13's on a stock 305 chip and basically stock motor minus the cam and a few things. I'd run the hotcam if I were you and then save for heads/intake. Just IMHO! Later!