i have the motor apart and i want to put a cam in it but i put the heads back on...so i dont want to change springs...everything is stock wondering what id the biggest cam i canput on the stock springs...safetly...
dont care but if i have a choice between 2 the exact same i kinda want a smoothe idle

i was thinkin the lt4 hotcam prolly??? i want a gm 847 mayb a cc306 but i think i need new springs for both

thanks Daniel

 

Honestly you'll need new springs for just about any larger cam you put in there. Springs aren't just all about clearing the cam lift either, RPM range is a factor as well.

 

every1 else agree...i need new springs for any new cam with bigger lift??? or how big can the stock springs hold???
Daniel

 

Yeas you need new springs no matter what aftermarket cam you go with!

 

The biggest cam with stock springs is stock, and that's pushing it.

 

yes you have to change the springs. the stock ones didn't even last for me on the stock setup, snapped one in half. also if its any consolation you can replace the springs with the heads on. o yeah and the cams you listed are what id considered to be a little large if you want a smooth idle although a tune can smooth out most of those. JMO

 

your going to have to change springs for just about any cam out there. Its no big deal to change springs with the heads on. Especially if the motor is sitting on a stand. Just turn the motor over till the piston is up top (watch the lifters, exhaust is just about closed and the intake begines to open). When you pull the springs off the valve will only drop 1/4" or so.