SB Mopar Valve springs?

[George Mirza]

Looking for a good valve spring for a 340 stocker motor. This is for a stock type lifter, not Schubeck/Smith.

[GTX JOHN]

Isky 3105 (I think) 1.47 od set up @ 165 lb at 1.68......may need to shim again after 100 passes. If you need more info
racer7411@yahoo.com John Irving

[Jeremy]

I have used the Howards 98215 "Zero Tolerance 1.25 Drop in springs, they have good pressures, and there a small diameter Chevy spring that give lots of rocker arm clearance.
Good Luck

[older racer]

hi, the comp cams, 926 -16 is a tough spring, fits great in a 340. has a high spring rate.

[George Mirza]

Thanks guys,

John
I have used the Isky 3105 in the past, I got them from Don Studley. He used to coat them. They seem ok, but I'm looking for a little bit more pressure, Isky catalog put them at #130@1.700 and #320@1.200. I miss talking with Don, he was a nice man.

Old Racer,
I have been using the Comp 926, but I put a new set in at the beginning of the season, set them up the same as the last ones and they must be junk, lost a good 500-700 finish line rpm from the old springs. Unfortunately I didn't test them before I put them in. I wonder if anyone else has had a problem with this spring?

Jeremy,
Did you have to machine the spring seats to get the Chevy spring to fit?

Thanks again,
George Mirza 1236 D/SA '71 340 Duster

[Jeremy]

No machining, just shimed the bottom step level. These springs last well and have a low height set up. You can get about any pressure you would like.

Many small block Chevys are using this spring with success in Stock.

At the time I was using these I had a longer than stock valve, I'm not sure how the heights will work out with stock length valves.