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Joined: 5/12/2008(UTC)
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Whats the maximun that can be plained off the pre pollution 308 heads?
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Rank: Member
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Joined: 12/10/2005(UTC)
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There are a couple of things that will determine the answer to that.
1 - Cam lift, and valve length
2 - Type of pistons used. Also 3 - Might also want to consider compression ratio with octane rating of fuel been used.
Its all relative - Clearance,
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Rank: Member
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ok, cam is a crow 495" with 240@50 on a 110ls pistons are flat top ACL hypers with zero deck hieght street use ? no drivability? who cares!! its in an HZ 1 ton with 4.44s & a spool with 27" tall slicks, trans is a trick trimatic with a 3800 converter Edited by user Saturday, 3 January 2009 8:44:20 AM(UTC)
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Rank: Member
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OK, we have some figures to work with - but guessing 40 thou is not the answer. First thing I would do is set the head up in a Head fixture on a flat steel bench. Then set up a DTI (Dial Test Indicator) with a valve in the head and the plunger of the DTI
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Rank: Member
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I have done a dummy assembly with plastersence putty, when I do a few rotations of the crank I have 4mm between the valve and piston, I picked .040 as a safe number not wanting to alter valve to rocker geomertry to far, rockers are YT5032s the last cam Edited by user Saturday, 3 January 2009 7:14:54 PM(UTC)
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Rank: Member
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Joined: 26/07/2008(UTC)
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Providing they havent had heaps off them before .040 is fine providing you know what it will do to your comp. Ive machined .080 off them before and know others have done more, even with .040 off though double check rocker geometry and intake manifold fit
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