Thread: Y-blockers?! will these springs work with with my cam?

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the cam is .425" lift 260 duration.

the springs are 95# seat pressure and 240# open pressure and max lift is .450" installed height is 1.750"

the engine is a 312 Y-block. any idea?

sounds good to me

That sounds like an Isky grind. If it is, the springs to use are as follows:
Dual with damper, chrome silicon
Visual i.d. blue-orange/yellow
O.D. 1.005"/1.430"
I.D. 0.730"/1.070"
Seat pressure:
135# @ 1.750"
285# @ 1.200"
Rate per inch: 275#
Coil bind: 1.120"
Max net lift: 0.550"

How's that for an answer?????

Originally Posted by techinspector1

That sounds like an Isky grind. If it is, the springs to use are as follows:
Dual with damper, chrome silicon
Visual i.d. blue-orange/yellow
O.D. 1.005"/1.430"
I.D. 0.730"/1.070"
Seat pressure:
135# @ 1.750"
285# @ 1.200"
Rate per inch: 275#
Coil bind: 1.120"
Max net lift: 0.550"

How's that for an answer?????

yeah it is an isky, and that is a very detailed answer! i remembered i have some 427 "orange" springs that i can use on it, so ill probly just run those.

I saved the spring info Richard provided above, since I'm planning on running this mild mannered cam in a new motor. Recently I posted the same spring specs on a Y forum. The response was that the pressures were high and the dual springs unnecessary. Guides would reportedly require machining for inner spring to go on.
One respondent who races Y's has a motor with a more agressive cam than the 260, which has been above 6500 rpms many times, no valve float. It has springs that are 93# on seat and 250 lb open. That is getting very comparable to the spring specs Thunder1957 first mentioned. The pressures also are supported by data in John Mummert's adds which appear in Y-BLOCK MAGAZINE, as well as Schumann Sales. Both businesses cater to the Y's Guys.
The stronger the spring, the higher the rate of cam and lifter wear.