LS Springs

Who's LS springs work the best?

Max Weg

Comp 918, PAC 1218 or PAC 1518. It will need an LS specific valve seal and you'll need to open the shims up about .015 to sit over the guides.

A 1218 is PAC's variant of the 918 and the 1518 is the nitride version that is an endurance spring rated for a little bit more lift.

Great info!!

Thanks
Max Weg

The above springs listed by Alex are good for the older 5.7 and 6.1 heads. There are better options for eagles and apache heads

i am currently working on the older heads but I have som appache and I am looking for some eagles. Any info would be greatly appreciated.

Max Weg

this is what BES runs on the newer heads and I bought this kit. it comes with a shim pack. springs and retainers. I looked to see if you can piece part cheaper but I couldn't do it. You could probably get away with not buying the retainers which are stupid money. part numbers are there

http://www.highhorseperformance.com/PSI_Valve_Spring_Manley_Titanium_Retainer_p/1515springkit2.htm

Thanks I appreciate the help!! I am currently building 2 Gen 3 hemis to do some testing with so anything i can learn is much appreciated.

Max Weg

Eagles and Apache heads run a different spring. I use a PAC 1220 which is an ovate beehive big block Chevy spring.

PAC has a 1535 for the older heads that is a direct drop in for the old 5.7/6.1.

1218x on my old style 5.7 heads.

Alex used to sell FRI and GTP cylinder heads. He knows his stuff.

I'm using Manley Nexteks.

GOOD INFO...love this section

i am using LS1511 behive springs with locators and shims since the cages of the stock springs broke...

GM performance has factory springs good to .570 lift and they are only around $60 shipped for a set of 16. I think they are ls9 or ls6 factory springs... just installed a set in my ls1.