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#1
01-09-2000, 11:30 AM
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I have a question, I'm just finishing my "fresh-up" on my race 455 and have a question regarding valve lash for my solid cam. Ultradyne recommends a lash setting of .026 (hot), but what should it be cold? When I first put this motor together I still set them at .026 (cold) any opinions? Thanks in advance.
Guy - O.P.R.A. |
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#2
01-09-2000, 11:30 AM
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I have a question, I'm just finishing my "fresh-up" on my race 455 and have a question regarding valve lash for my solid cam. Ultradyne recommends a lash setting of .026 (hot), but what should it be cold? When I first put this motor together I still set them at .026 (cold) any opinions? Thanks in advance.
Guy - O.P.R.A. |
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#3
01-09-2000, 02:38 PM
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I would just set them at .026 cold for starters. Once you get the motor hot, measure the clearance on the intake and exhaust. The difference between your cold lash and the lash you have now hot will give the difference between the cold setting lash and the hot lash: i.e. if you have .024 hot then you know that .028 should be your cold setting. Anyway, what the cam manufacturer recommends is just a suggested initial setting, you can play with lash for tuning. With my cam Crower says I can use .016 to .030.
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#4
01-09-2000, 03:27 PM
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Rule of thumb is if they recommend .026 you add .002 if your setting them cold, so set them at .028, and do the same for both intake and exhaust. At the track you can play but never go more the .010 under what the recommended setting calls for. At the track do the intake first, if you don't pick up
any ET, then try the exhaust.
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#5
01-22-2000, 12:23 AM
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I always wondered why they called for setting lash hot. Iknow that's because that's with everything at temp amd expanded for correct clearances. But even if you are FAST at setting them by the time you get to last cylinder motor has cooled considerably so not as accurate a setting as the first ones.
Skip Fix
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#6
01-23-2000, 12:35 AM
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With out challenging Gach, I set my E-heads .005 tighter. When the motor warms up I usually only need to readjust a few valves.
------------------ 10.949@122.54 6.982@99.75 brooksa@gte.net
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1994 Formula 535ci NA CV-1 - single 1050 with c14 - 940hp@7000/825tq@5200 Pontiac Powered 4th Gen Project Progress 
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#7
01-24-2000, 11:53 AM
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Has anyone else noticed that the lash (after being set a cople of times) says the same on the drivers side but always is loose on the pass side. Or is this cause I'm lefthanded?
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#8
01-24-2000, 10:45 PM
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Hey Dude, you run those non street E-heads, have you notice any differnce in setting the valve lash over iron heads. Hey Warped congratulations! on getting the GP in the 10's.
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#9
01-24-2000, 11:07 PM
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Thanks for all posts. My motor went bye-bye on sat 22nd at Pontiac Drag Days race #1.
I have a broken wrist pin (Butler lightweight) on #7 cyl (detonation?)Otherwise performance was good, (11.41 @116.00 at 2800 ft elev)Too bummed right now to pull it,I'll keep all posted on what I find. Thanks, Guy Mazza - O.P.R.A. |
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