I was just discussing my motor that im having built and he asked me if iwas going to run double springs. I said that i thought i was but havent gotten that far. He about came unglued, he said i shouldnt use them. Is he right?? he was a mechanic for years, he says the double springs are for high rapping motors. i plan on runnin mine no higher that 6 grand if even that high
heres my combo thus far

402 bored 30 over
about 10-1 comp
290 heads, 2.19 1.88 valves, using smaller stem
port work, bowl clean up, gasket match
cam is a comp cam, 274/280 duration 568 578 lift
solid
pete jackson gear drive, 750 double pumper Hei distributor

Should i run the double springs or listen to my grandpa and run single springs.

Really what you should do is call the cam company and see what they recommend. They will be able to tell you exactly what you need. That cam might make power past 6000 also, that is what you need to think about. They will recommend springs made for the rpm range the cam is meant to run in. Solids require a little more pressure anyway.

Daniel

i have yet to see a need to run double springs.............for bbc with cams smaller then 262-273 @ .050 for solids...................even at 7000 rpms............just see what the came needs for spring pressue at seat and lift and go find a single spring that is rated at or near what is being recommended.........for me it is better to run less spring coils as possable just so its easier on calve train parts.......why buy a double spring with the same rating as a single spring.........ya im sure someone will say it will last longer but honestly they will last longer then one thinks......im still running a set that are 13 years old that is a single spring with .600 lift....they still go to 7000 rpms...........

Cam card should have the recommended springs to use for that cam....

I'd say to use the recommended springs on the cam card or call Comp and ask them for the exact PN# for the springs you need...but use the recommended springs.

I think of it like this..If your gonna put all that time,effort and cash into an engine, is it really worth using stock single springs and running the possibility of ruining your engine because of a broken spring/dropped valve ????

Also, all this talk about double springs being harder on the valve train is a bunch of horse doo doo. See the way the spring works is that the inside spring is softer than the outers, so when the dual springs compress the inner absorbs most of the pressure then the outers start to absorb some pressure. A dual spring is also snappier than a single. and thats what you want

just my .02

Originally posted by sapper92310:
I'd say to use the recommended springs on the cam card or call Comp and ask them for the exact PN# for the springs you need...but use the recommended springs.

I think of it like this..If your gonna put all that time,effort and cash into an engine, is it really worth using stock single springs and running the possibility of ruining your engine because of a broken spring/dropped valve ????The recommended spring is not always the correct spring. Many Comp cams have recommended springs that will not install at the correct seat pressure to get the lift required. This happen to a buddy of mine recently.

Using a single spring does not necessarily mean using a stock spring. I have 1.445" singles in my SB engine and they handle the .544" lift and 7000 rpm shifts just fine. There are smaller diameter single springs that can handle more lift and higher rpm than my springs.