My friend has a set he bought for his vette, he bought them direct from AFR, they are the 74cc milled down to 60cc center bolt
with sender tapped, L98 plug angle, he sold the car so he no longer needs them.

My question would it be much of a performance gain with the stock L98 cam? what is my head cc at now? is it 64cc, if I decided to cam swap I think the ZZ4 is about right with my induction combo, would this idle fine without driveablity problems with the SLP prom or would I have to burn a new one.

The deal is to good to pass up, I just want to know if you would install them now with the stock cam or wait until I can afford to do the cam and rebuild.

 

come on guys, I need your input

 

I know of someone with a 2nd gen Camaro that dropped a full second off their quater mile times by going to 195cc AFRs from stock heads with a very mild cam...if memory serves me right it was a flat tappet hydraulic under 215@.050 and around .450 Lift or so..I don't think it would be a waste, you would def. feel the difference.

Don't be scared of the large ports of the 195s with a small cam, new head manufactuers have discovered ways to keep the velocity up even with larger ports.

 

Power is made with the heads...buy the set if the price is right...

Remember that the heads determine HP potential and the cam determines powerband (RPM range)

Sure, your stock cam will mean that your powerband is lower and that you can't develop higher RPM HP...but I would try it and see what you think...

 

If those heads are 1000 or less, gobble them up. I think you'd gain about .4 in the 1/4 and you'd gain a couple mph. If you throw on a stealth ram you'd probably gain another .4 of a sec. The intake and heads are about equal when it comes to the biggest bottleneck on a stock TPI 350.

 

I would only caution one thing: plug-to-header clearance. Your headers are designed for the cast iron L-98 heads with stright plugs. Have a look and try to at least visualize where the plugs will be pointing and see if there's going to be any obvious massive interference.

The plug angle on those heads is the same as a set of Corvette aluminum L-98 heads.

 

Though of one other thing- 14cc is a LOT to mill off the heads. Your intake might have problems lining up and sealing up unless you mill the sides on the intake a little. Any machine shop can do this for you.

 

Oh, dammit! One more. Vette TPI systems always used an old style 86-down intake bolt pattern. If your F-body TPI intake is 87-up you will also have to have the 4 center bolt holes redrilled to match the older 86-down style bolt pattern. Again, a machine shop can do this for you.

I think that's really it this time.

 

This is getting embarassing.....

Vette's didn't use an exhaust crossover passage like your F-body TPI system does. As such, the AFR heads might not be drilled for an exhaust crossover passage. It'll still bolt up but your EGR system will become non-fuctional unless the heads have been drilled for the exhaust crossover passage.

AFR can machine them in for you, I bet, if that's important to you.

 

thanks for the insight I will look at them tonight