yyz28

I've got a set of stock L98 heads, with brand new (1000 Miles) stock Z28 springs. How much cam can I put in the motor without needing new springs?

Current Cam Specifications:
* Advertised duration: 282 intake/282 exhaust
* Duration at .050 in. cam lift: 224 intake/224 exhaust
* Gross valve lift: .465 in. intake/.465 in. exhaust
* Lobe separation: 114 degrees
* RPM range: 2,200 to 5,200

Desired Cam Specifications:
* Advertised duration: 292 intake/292 exhaust
* Duration at .050 in. cam lift: 234 intake/234 exhaust
* Gross valve lift: .488 in. intake/.488 in. exhaust
* Lobe separation: 114 degrees
* RPM range: 3,000 to 6,200

Thoughts?

Electron_Blue

what kinda rocker studs are you running? if pressed in i would get them pinned or some screw in ones especially if you go with a bigger cam. General rule of thumb is after 4.75" lift IIRC. About the cam, im not sure. i though most z28 sprngs are made for .49 lift....the new cam would be cutting it close but theres only one way to really find out....worse comes to worst you have a built in rev limiter / buy bigger sprigngs later

yyz28

Press in.

Well, the cam is avaliable, so I think I'm going to give it a shot.

Electron_Blue

lol..if it was me id throw it in too...jsut be careful....if a rocker starts chattering and you have to retighten multiple times...then worry bout the stud.

formularpm

What height are the springs assembled at?

ede

z28 springs aren't good for any lift. trash them and the factory rotators and buy a set of good springs like comp or lunati sells.