Whats size tap for head bolts

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Jan 6, 2002 | 10:01 PM

Mkos1980

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From: Macedonia ,OH

Car: Formula

Engine: 6.0 LSX

Transmission: 4L60E

Axle/Gears: 9 Bolt 3:27

Whats size tap for head bolts

I am cleaning the holes before the new heads. What size tap?

Jan 6, 2002 | 11:09 PM

88WS6TA

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From: Birmingham, AL

IIRC it is a 7/16-14. I would not use a tap but instead pick up a thread chase available at summit or a local tool supply. A chase is not as sharp and is easy to get to start in the threaded hole.

Jan 7, 2002 | 05:38 AM

ede

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From: Jackson County

yep 7/16-14 i use a tap on the block but a thread chaser might be better. i use a wire brush on my grinder to clean up bolts but the sealer on head bolts is hard to get off so i use a thread chaser on them first.