Generation IV External Engine - LS3 - thread pitch for holes on front/back of head?



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2efnfast
08-09-2012, 11:09 PM
On an LS3 525 crate engine (L92 heads I think) does anybody know what thread pitch the holes are on the front and back of the heads (where you bolt accessories, etc...) to?

3/8 course thread fits but I get some resistance after several turns .... I don't have any metric bolts to test with.

2efnfast
08-10-2012, 05:52 PM
M10x1.5 for them incase anybody ever needs it.
Mike454SS
08-16-2012, 08:36 AM
On an LS3 525 crate engine (L92 heads I think) does anybody know what thread pitch the holes are on the front and back of the heads (where you bolt accessories, etc...) to?

3/8 course thread fits but I get some resistance after several turns .... I don't have any metric bolts to test with.

M10x1.5 for them incase anybody ever needs it.

Every fastener is metric on these engines.