I purchased a Lingenfelter 213/219 468/472 112 cam and I'm looking to upgrade the springs. Heads are off and getting rebuilt. Machine shop said they like to use teh 986 Comp springs over the regular single spring ones. Does this sound right? Will the 135lbs seat pressure be too much for this small cam? Are we better off int he long run with these springs? Mods are Forged 355 lower end. Ported Cast L98 Heads, TPI intake and 12lbs ATI. He said that cutting new seats would be 60 bucks. for th elarger springs. Sound about right?

 

sounds like a lot of spring to me. do they happen to have a set of the comp springs sitting there they'd like to get rid of? i looked up a similar cam in lunati catalog and the spring for it was a 73943, 100 # seat pressure. even if there was a differance in the lunati cam and your cam there are still a lot of springs in between the two.

 

I think they just looked at a Comp Cams and saw what spring was recommended.

 

that's what i did, lift was within .002 and 112. however there could of been some point i missed since i looked real quick. i'd check out what linginfelter recommends for the cam.

 

I looked quick on Lingenfelters site and all they said is a 1.437 Double Spring. They said to use this with their. 211/216/219 cam combo's

 

I am looking into this cam and wondering the same thing. On Lingenfelter's site I believe this cam is recommended for stock heads and manifold. Wouldn't this mean the heads are fine as they are? I would talk to Lingenfelter either way, but I believe this cam was designed for stock heads with its low-lift characteristics.

 

986 will work on even a stock cam. Just make sure theyre properly set up, at the correct installed height. They sound like exactly what LPE is spec'ing for use with that cam - yerbasic 1.45" spring.

 

LPE wants all their ams set up at 1.900 Wouldnt that require alot more machinework

 

Cams don't have a valve spring installed height spec. Springs and valves do.

So don't worry about what LPE specs their springs at if you're not using their springs.

986s will be inadequate set up at 1.900". They'll give about 50 lbs on the seat at that height. Don't do it.

They are supposed to be set up at 1.800". Set up at that height, they're good to about .550" of lift; and will give you about 115 on the seat and 260 at .500". About perfect for a typical little street hyd roller like that one.

That's what I'd suggest you do, if you use those springs. Basically follow the spring mfrs instructions. To get that height, use longer valves and/or offset keepers to increase installed height without machine work, and shims to decrease it; and a valve spring height micrometer to measure it.