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#1
02-04-2021, 05:06 PM
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Newest ideas for coolant holes in aftermarket blocks
So what is the newest thoughts for what coolant holes and where on aftermarket blocks not dry deck running? Just copy factory size and locations?
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune [email protected] 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
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#2
02-04-2021, 05:25 PM
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some of the original are way close when you go to bigger bore
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#3
02-04-2021, 06:10 PM
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Cometic has a MLS gasket available with small water holes.
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) Best time 5.13 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
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#4
02-04-2021, 06:10 PM
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I think the butlers make a larger bore gasket . Believe it locates the holes away from the bore some.
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Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
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#5
02-04-2021, 06:27 PM
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When we did my IA2 block for my street 505 engine Pontiac Dude furnished us with details where he drilled his blocks that used revised smaller cooling holes. Among other considerations, as suggested above away from the bore some.
Based on it we had Cometic make a custom gasket for us. It has specific part number assigned to the design by Cometic with a 4.380" bore / .040" thick. .
__________________
'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) Best time 5.13 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
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#6
02-04-2021, 07:09 PM
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A fwiw, regarding the special gaskets I mentioned in post #3 above I was told they have 20 percent smaller cooling holes in certain locations.
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__________________
'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) Best time 5.13 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
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#7
02-04-2021, 08:53 PM
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Steve I think I got the same from Dude.
Bore is going to probably be 4.350, but way smaller as delivered on the aluminum IA. Not sure if they are thicker around than the iron blocks since they have the sleeve and the aluminum support or it. or any siamesing in there, like where the "421" hole is. Cometics can make them with custom sized holes. Butler's holes are "proprietary" and they will not sell his gasket pattern to someone else.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune [email protected] 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
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#8
02-04-2021, 09:54 PM
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Just drilled my 48s for coolant between the center exhausts. Block has been done awhile ago.
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