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How much valve lash to allow for cold setting with aluminum heads.

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Author	Topic: How much valve lash to allow for cold setting with aluminum heads.
ted Journeyman Posts: 75 From: Central Texas Registered: May 2003	posted 08-06-2003 10:32 PM I'm assembling a 331 SBF with a R302 block topped off with AFR aluminum heads. Is there a rule of thumb cold valve lash allowance for a solid lifter or roller camshaft to compensate for the head expansion as they grow upwards as they're heating up? Stated differently, how much additional valve lash does the valve train need when performing the cold setting? ------------------ Ted E. Fe's are plenty fast, but "Y"'s are fun when they run in the nines. IP: Logged
afret Gearhead Posts: 212 From: Lancaster, CA Registered: Feb 2003	posted 08-06-2003 11:12 PM I think Crane recommends setting the lash tighter by .006 when cold with Al heads on an iron block. That worked out pretty close for me recently on a solid roller. Just double check it when hot. http://www.cranecams.com/master/adjustvt.htm [This message has been edited by afret (edited 08-07-2003).] IP: Logged
steve'66 Gearhead Posts: 9476 From: Sonoma,CA,USA Registered: Mar 2000	posted 08-06-2003 11:13 PM Ted, Add .004 with aluminum heads cold, then double check them whe up to operating temp. SteveW IP: Logged
ted Journeyman Posts: 75 From: Central Texas Registered: May 2003	posted 08-07-2003 07:23 AM Thanks for the input. This will give me a good starting point. I'll re-check the lash hot and see just how close it is to spec before readjusting. Thanks again. ------------------ Ted E. Fe's are plenty fast, but "Y"'s are fun when they run in the nines. IP: Logged

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