Just picked up a slightly used set of Pac racingsprings Part#Pac-1206X They say 700 max left and my not cam is 525\525 is this to much spring?

Installed 145@1.800
Open 411@1.150
Rate 409
Coil Bind 1.000

 

Better do some other valvetrain upgrades. A spring that stiff is going to put your pushrods through hell.

 

So besides the hotcam and springs, a you suggest a set of hardend pushrods?

 

Yes. Those springs have a ton of open pressure. Your stock pushrods wouldn't last very long at all. I'm not even sure how well the lifters will handle that much pressure.

 

As of now my block is getting a cross hone,new pistions and I have a set of brand new ls7 lifters, trunion upgrade also. Everything is on a fresh rebuild

 

Probably way more srping than needed. Also, in my opinion, there are certain parts I would never put on my car used. Valve springs and clutches come to mind right away. You are spending a bunch of money on all that work. A set of appropriate springs are not that much more.

 

I would highly recommend bigger pushrods for any spring. The 1206X at 1.8" only will have 360lbs open. You’re not overkilling your combo. Like mentioned before, I would only worry about how much use the springs got and if they were taken care of during install and removal.

We were doing an LS1 Tech sale for our kits. if interested I will give you the same deal. PAC-KS15 for $215.00

 

I'd run beehives with a hotcam. Better harmonics and more RPM potential. Plus those lobes aren't hell and won't beat down a beehive spring. PSI1511 or PAC1218 come to mind.