I'm replacing my #14 head and installing a #18. Found that the 2 front internal hex bolts, down by timing chain, require a longer bolt on the #18 head.
Anyone know the length that's required?
Thx.

original where Allen head machine screws M8 X 30mm, later heads #17 and above used same configuration M8 X 50 mm length

I had to do that when I replaced a #14 head with a #20. My 602/603 engine manual says the original M8x30mm Allen head cap screws are to be replaced with M8x50mm.

Jeremy

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"Buster" in the '95

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Ok, appreciate the info. Just wasn't sure how much longer they had to be.

Oh, 1 more ?. The turbo oil drain tube interfaces with an oring to a casting that bolts to the side of the oil pan; which has a gasket. Can't locate that gasket anywhere.

The original part number is # 603 187 00 80 and the upgrade part is #603 187 06 80 if that helps any. Should be available for a couple dollars, even from the stealership.

Don't break or lose that aluminum casting it's NLA from MB

Ok, cool. Thx alot.