Reply to "Beehive spring"

garth66"When speed is the only thing that counts"

Do NOT use the PAC-1220 spring - you will experience coil bind with your cam. I used that spring and my cam spec was only .588" lift, but due to some of the springs being out of spec (I trusted the mfgr spec and didn't measure each spring's compressed height myself) I suffered a coil bind situation and broke a valve spring after only 987 miles! The valve dropped down into the cylinder - piston damage, head damage, destroyed valve guide and metal bits through the engine, etc. Had to pull the engine and spend another $4,000 rebuilding the engine AGAIN! Went with time-tested conventional dual valve springs the 2nd time around.

If you use the PAC-1220X spring, you MUST measure each spring under full compression and use that measurement with your calculations of actual cam lift and head seat height measurements to verify you will not have a coil bind situation.

1/19/1511:57 AM

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