xr264hr 212/218 duration, .487/.495 lift 110 lsa

will comp 981 springs control this cam, if not what will?

Or should i go with the xr258hr 206/212 .480/.487 lift 110 lsa

This will be a daily driven 350, ported 305 heads, 750 cfm carb, performer intake, long tubes bullet mufflers, 700r4 stock stall 3.42 rear.

thanks

Kevin

 

http://www.compcams.com/catalog/056_057.html

Comp recommends 986.... 1.45" outer diameter

I'm running that cam with 1.6 rockers and 987 springs (next step up) in a 305. Runs OK, for a 305.

 

http://www.sdpc2000.com/cart.asp?act...2060&pid=81626


What about these springs, they say .550 max lift.

 

I run the next size up Comp cam (in sig) & had to go to the 987 springs to cure valve float over 6k. This was as per Comp's techline reps reccomendation.

 

well the car is a daily driver and it will never see over 5500 rpms.

 

They are inadequate. They're 1.25" diameter. They're not going to control an agressive roller cam.

Believe the cam mfr's recommendations. They will not warranty the cam if used with inferior springs that don't meet their minimum specs, like those GM stock ones. And the engine won't run nearly as strong with valve floaters like those stock springs, as it will with something that has enough nads to do the job right.

 

Is that an indirect message?

 

I'm not a big fan of stock valve springs..... they're pretty weenie

Catch me sometime right after I've had to deal with yet another broken one, I'll tell you how I really feel.