Steam holes in heads but not in block - Team Camaro Tech
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post #1 of 3 (permalink) Old Jan 6th, 05, 07:05 PM Thread Starter
Senior Tech
Join Date: Jun 2003
Location: Tampa, FL
Posts: 957

My Canfield heads came delivered with steam holes already drilled. My big bore Bow-Tie Sportsman block does not have steam holes and I was not planning to drill them. Do I need to plug the steam holes in the heads or will the gasket without steam holes seal them up?

Also, when looking in the block's water jacket, I can see where the water jacket ends between the siamesed cylinders. If I did drill the steam holes, they would be behind the water jacket. What would I be drilling into? Is it solid casting? If so, what is the point with the steam holes?

Thanks. -Neil
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post #2 of 3 (permalink) Old Jan 6th, 05, 07:29 PM
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Join Date: Feb 2002
Location: N.W. Washington
Posts: 7,963

unless you plan on idling around town daily for hours on end, don't worry about the steam holes. they were there for cars that spent thier life idling, (i've actually heard under 1500rpm continuous) and never had a good steady flow of coolant moving around the block, esp. at the siamesed area. thus creating hot spots and steam pockets.
none of my half dozen or so buddys or myself with 406's have ever drilled them, most of our cars are street strip cruisers, but we have all driven them extensively on the street as well. mine runs 180 all day, any weather, with a 3 core copper brass radiator.
as for your steam hole issue, just run them and the gasket will take car of the rest. mines the same way, only holes in the block. they will seal fine.
of course, as always just my opinion from my experiences.

good luck with it [img]graemlins/beers.gif[/img]


1968 rs with an old school 354" SB2.2 pump gas motor.

Repetition does not transform a lie into a truth.

Franklin D. Roosevelt
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post #3 of 3 (permalink) Old Jan 7th, 05, 10:15 AM
DOUG G's Avatar
Join Date: Mar 1999
Location: Maryland, USA
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Just ordered new Protoplines (200's w/ 72cc)and shop said no holes needed.So I'm gonna try them without the hole and see what happens.Most say 50/50 shot.

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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