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Joined: Oct 2010
Posts: 202
5
'Bolter
'Bolter
5 Offline
Joined: Oct 2010
Posts: 202
I am rebuilding a 261.The cylinder head that came with he engine was a 235 (848) without drilling the steam vents drilled in the proper locations. I am having the machine shop drill them for me while refurbishing the head. The question they have is are the holes drilled perpendicular to the head surface or are they drilled at some angle?

Thanks in advance
Walt Williams
La Verkin,Ut

Last edited by 54Belair; 07/08/2013 6:32 PM.
Joined: Aug 2001
Posts: 1,299
G
'Bolter
'Bolter
G Offline
Joined: Aug 2001
Posts: 1,299
at an angle. I think there is good info on inliners.org if you want to do a search for it over there.

Joined: Sep 2001
Posts: 29,269
Bubba - Curmudgeon
Bubba - Curmudgeon
Joined: Sep 2001
Posts: 29,269

If you expect steam in your coolant passages, you should also expect trouble. Jim Carter started the steam-hole/steam-vent foolishness and it has persisted.

GM referred to the six extra coolant passages in the 261 block/head as water holes and here is a discussion on 235-head drilling angles.

Joined: Sep 2001
Posts: 29,269
Bubba - Curmudgeon
Bubba - Curmudgeon
Joined: Sep 2001
Posts: 29,269

Greg beat me to the inliners reference - it is the link in my post above.



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