I currently have the lt4 hotcam and i want to step up a little bit and buy a compcams 503 the specs are 224 intake and 230 exaust duration. the lift is 503 and 510 on 1.5 ratio rockers. I have the lt4 hotcam springs, 1.6 rollerrockers, and pcm tuning so could i just buy the cam and just get the computer retuned, or do i need to buy different springs and retainers.


thanks for the help, Josh

 

not sure how the lift translates on 1.6 rocker arms but im pretty sure the hot cam springs will only hold to .525 lift and the cam may exceed those specs

 

Like 94z28L said, you will have to change your valve springs, you can reuse the rockers though.

 

if they're the GMPP rockers i would junk em and upgrade wile you're in there

 

The LT4 HOT cam springs are rated to .530" max lift.

IMO, those 2 cams are so close it is not worth changing. It is only worth going straight to the CC503 instead of the hot cam.

The little extra lift is not worth going for - same as the +4 duration intake and +2 exhaust.

You'll get all done, having spent time and money, and tell us "I can't really tell the difference."

The GMPP rockers are fine - they are made by Crane and are good quality parts.

Jim

My Site: http://home.mindspring.com/~jim_fisk/id1.html

 

I would not change for that cam...to close like said above. Try out the compcam XFI grinds for the lt1. They work great...and tune like a dream. There lift is with 1.6 rockers also. You will just need to get some 918 springs and retainers and your good to go.