Too much slop in the timing chain?
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Teching In
Joined: Jul 2005
Posts: 46
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Too much slop in the timing chain? I just finished a freshing up/ upgrading my LT1. I'm using the stock timing chain since it only has 30,000 on it and shows no obvious signs of wear.
My question is as follows: When I rotate the motor by hand, at four distinct points in the rotation (N.E., S.E., S.W., AND N.W.) the cam will snap forward, taking up the timing chain slack on the back end.
My valve spring pressure is 125# on the seat and 320# open; Comp Cams Xtreme lobe pattern with lift at 556 I/ 520E. I'm using the Comp Cams 1.6 Pro Mag rr's.
My machinist said that this cam lunge is normal on higher lift/ stiffer spring roller cam motors and I shouldn't worry. Also, the lifters are slightly bled down since they have been out of commission for over a year. Anybody else experience this?
Cheers,
JD
My question is as follows: When I rotate the motor by hand, at four distinct points in the rotation (N.E., S.E., S.W., AND N.W.) the cam will snap forward, taking up the timing chain slack on the back end.
My valve spring pressure is 125# on the seat and 320# open; Comp Cams Xtreme lobe pattern with lift at 556 I/ 520E. I'm using the Comp Cams 1.6 Pro Mag rr's.
My machinist said that this cam lunge is normal on higher lift/ stiffer spring roller cam motors and I shouldn't worry. Also, the lifters are slightly bled down since they have been out of commission for over a year. Anybody else experience this?
Cheers,
JD
