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Old 07-04-2006, 10:45 AM
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SBC valve spring & cam timing 383

i have a chevy small-block 383 . the heads are cast 400 heads angle milled to 60 cc 2.02 in 1.60 ex bowl blended and gasket matched i was wondering if i could use stock dia springs the cam i am planing to run is 500 lift 300 duration . the heads have been cut for 1.440 springs cut with a .060 shim in place . would save me some money if i could run some high performance
stock dia springs. valves are set up @ 1.830 . or if i could find a 1.440 spring
that would have about 125lb @ 1.830 . i have 15 good double springs. all i have been able to find are complete sets . also need 2 retainers & 10 degree locks. also need advice on cam timing i run this cam with same components
before 350 . all I'm changing is the pistons & crank form 350 to 383 . & compression increase from 11.1 to about 12.1 . 350 ran better with 2 degree retard bushing. should i start out at 2 degree retard or 0 degree with the 383. the 350 ran 12.50 in 1/4 mile 1.75 60 ft.. 79 camaro 4.56 gear 3500 stall power-glide apox weight 3000
thanks

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Old 07-04-2006, 03:10 PM
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Quote:
Originally Posted by jsteve068
i have a chevy small-block 383 . the heads are cast 400 heads angle milled to 60 cc 2.02 in 1.60 ex bowl blended and gasket matched i was wondering if i could use stock dia springs the cam i am planing to run is 500 lift 300 duration . the heads have been cut for 1.440 springs cut with a .060 shim in place . would save me some money if i could run some high performance
stock dia springs. valves are set up @ 1.830 . or if i could find a 1.440 spring
that would have about 125lb @ 1.830 . i have 15 good double springs. all i have been able to find are complete sets . also need 2 retainers & 10 degree locks. also need advice on cam timing i run this cam with same components
before 350 . all I'm changing is the pistons & crank form 350 to 383 . & compression increase from 11.1 to about 12.1 . 350 ran better with 2 degree retard bushing. should i start out at 2 degree retard or 0 degree with the 383. the 350 ran 12.50 in 1/4 mile 1.75 60 ft.. 79 camaro 4.56 gear 3500 stall power-glide apox weight 3000
thanks
We would need to know the cam spec's to see what springs and advance you need.
They make a stock diameter spring that will run up around .500 lift , about $30 set.
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Old 07-04-2006, 04:40 PM
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I would run the springs rates recommended by the cam manufacturer in a spring that fits the cutout. Smaller diameter springs can be used if you can get spring cups that will center the spring. Cups will offset the price of the correct springs. Don't forget that smaller springs will also necessitate smaller retainers. Springs are the most important component of any engine. This is not a place to try to save $ 30.

If you insist on finding one more spring I would check with machine shops. Most all keep a box of used springs that come as take offs, and with a few minutes work finding and checking the poundage they can probably give you another one for $ 10 or so. (their time is money)

Springs are the most important component of any engine. This is not a place to try to save $ 30.

Larger cubes need more breathing.
First the 350 preferring retarded says that the cam was a little on the short side or the LSA a tad wide for what the combination wanted.

You will be undercammed 6-8* using that same cam in a 383. Upping the cubes usually means 2* less LSA desired. Most 383s like 106.

Generally speaking.... uh huh.

This is a 7000 rpm drag car. You cannot run junk springs.

You are not going to find any new dual spring sets for $ 30 that "I" would ever install. YIKES

www.readershotrods.com

Last edited by xntrik; 07-04-2006 at 04:50 PM.
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