okay so i am about to purchase a zz4 camshaft along with springs and retainers . anyone running zz4 camshafts in there 305's?, i want to know what else i would need to run this setup

 

If you're using stock heads, I think that cam's lift is too great. It'll hit the valve guides causing all sorts of problems.

 

yeh i was plannig on using stock heads, what would you suggest? anyone running this cam with stock heads have any problems?

 

my friend ran it in his stock l98 heads without problems if that helps any

 

thats what i want to hear , well to bad the engine isnt going to be put together any time soon, im aiming for the summer for my tpi regal to be running

 

I installed a ZZ4 cam in my 91' chevy truck along with TPI. The motor in my truck is a 93' caprice crate motor with stock iron heads. No problem! I believe the heads are the same or similiar to L98 heads. Don't know anything about the heads on a 305 though. I also have a ZZ4 crate motor in my 67' Camaro with TPI as well. I set this car up in 1999, and have had no problems after 7 years and 85000 miles.
The cam works very well with TPI!!! You don't loose any low end performance and idles nice too.

 

I didn't have enough retainer to valve seal clearance on my 083 heads. IIRC, the intake side cleared, but the exhaust side would crash the seal.

Best thing to do is measure.

 

I have the ZZ4 cam in my car with stock 083 heads and a mixed set of 1.5/1.6 rockers. The 1.6s are on the intake. The valve guides were NOT milled down and it works just fine. The safe limit was .060" for retainer to guide clearance and my exhaust was running .045" IIRC. So its close, but the most it'll do (in my case) is bump the seal.

 

Im planning to use this combination: world products s/r torquer heads, ZZ4 cam, ported TPI intake with 52mm BBK, 1.5 roller rockers,21lbs injectors, Haltech e6gmx. Hopefully it will run in summer

 

yeh ive heard of using the 1.6 for the intake being that zz4 has alot of exhaust lift. thanks for all the replies fellas

 

Actually, that's the safe limit for retainer to valve seal clearance. Bumping the seal isn't a great idea. It may be OK for you, but I wouldn't do it.

This can easily be remedied by buying some offset locks and a spring shim. As long as you have at least 0.050"-0.060" before coil bind you should be OK.

 

okay so i lost the auction for the zz4 kit on ebay :-\, where can i find the camshaft now, summit doesnt sell them i checked jegs only thing i come up with is the actual crate motor


edit: never mind i found this one guy on ebay that has one to many for sale. 139 plus 15 shipping, now i just need the springs,

 

Jim Pace Performance: 800-7483791
Just bought the cam 1 month ago price $192.95
They are a GM performance outlet!!!
My motor was already a hydraulic roller block, reused all lifters etc.