Cam lift and valve spring question

[Greg]

Doing a cam swap this spring on the 97' Z28 (LT1,M6) and think I found one I like. Specs are 226 / 234 - .569/.570 - 110 LSA with the operating range of 2000-6200rpm. Question is about my valve springs. According to a post I found by Lloyd Elliot "If you set the Crane springs (Crane 99893) up at 1.750", they will have plenty of pressure to handle XFI lobes and up to .580 lift spinning 6500 RPM." Is that an acceptable safety margin to run? 99% of the time it will be shifted at no more than 6200 rpms. Got a good deal on the springs and really want to use them. The rest of the vavle train will be built for overkill. Just want to make the summer toy a little faster and sound a little meaner.

 

[Sean]

Just get a set of the Patriot Performance Dual Golds for the LT1 engine. Complete kits, they rev to 6800rpm easily are lightweight and are super easy to install in the facotory valve pocket.

Buy the kits, follow the instructions and enjoy 620 lift capable springs that have good longevity.

If you want more lift "not that the retainers will clear" the Patriot Extremes" are good for around .660 lift.

You'll have to check retainer to guide clearance for any cam over .560 with a on a lt1.

IIRC the partiot kit does add some room.