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ZL1 Cam Cold Lash
From what I could find, the 9181 ZL1 has a hot lash of I=.024, E=.026 ? Anyone care to give a cold lash setting? I’m guessing subtract .002 off the above specs? Any help appreciated. Thanks sYc.
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69 SS/RS 396 M20 X22 Nor 12B,72B,712 bought 1979 FULL OWNER HISTORY 69 Dick Harrell tribute Day II 427 M20 4.10 X11 76 orig pnt, 711 67 Super Stock 302 Camaro re-creation |
#3
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What if engine has factory aluminum heads? Still add .002?
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#4
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I set mine as per specs w/alum heads and had no issue. Larry
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#5
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Quote:
Block material? |
#6
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__________________
69 SS/RS 396 M20 X22 Nor 12B,72B,712 bought 1979 FULL OWNER HISTORY 69 Dick Harrell tribute Day II 427 M20 4.10 X11 76 orig pnt, 711 67 Super Stock 302 Camaro re-creation |
#7
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Iron heads & block add .002. With aluminum heads set cold lash tighter about .005-.006 on a rat motor. If it’s aluminum block & heads about .010 tighter cold. The thermal expansion of aluminum causes the lash to increase hot.
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#8
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Like you said, I would go .002” LESS than the hot lash spec. for break-in. Then
with the engine at running temp, shut it off, and set the valves on one cylinder to the Hot lash on the cam card. Let the engine fully cool down. Measure the lash on that cylinder that you set hot. That will be the cold lash setting to use on all the cylinders. |
#9
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If it is a aluminum block and heads set .012 tighter when cold. .012 .014 You will be very close to your .024 .026 when hot.
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The Following User Says Thank You to KenMaisano For This Useful Post: | ||
bbbentley (07-10-2020) |
#10
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Quote:
__________________
69 SS/RS 396 M20 X22 Nor 12B,72B,712 bought 1979 FULL OWNER HISTORY 69 Dick Harrell tribute Day II 427 M20 4.10 X11 76 orig pnt, 711 67 Super Stock 302 Camaro re-creation |
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