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Ring gap on a 496 -8.1L vortec engine ?

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Ring gap on a 496 -8.1L vortec engine ?


Old 04-05-2013, 04:21 PM
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Join Date: May 2005
Posts: 12
Smile Ring gap on a 496 -8.1L vortec engine ?

Hi all !
Is there any who have experiance with how narrow ring gap its ok to use in a 496 HO 420hp engine ? Its going in a Mastercraft so possible most light load.
Thanks a lot.
espen is offline  
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Old 04-06-2013, 07:03 AM
Join Date: Feb 2012
Location: westville, NJ
My Boat: 1967 34 Hatteras summer house. 2000 Crownline 248ccr her boat. 79 Pantera 24 Sport.
Posts: 3,980

add a couple thousandths to the spec. boats run hot pistons in cool bores frequently. the heavy load will heat the pistons while the very large cooling system (atlantic ocean? ohio river?) is keeping the block temps low. result can be pistons and rings expanded to the max in bores that haven't expanded much at all.
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Old 04-07-2013, 09:28 AM
Join Date: Dec 2009
Location: berea,ky.
My Boat: 03 checkmate 300
Posts: 101

go with .018/.024 gap.Hasting rings are pre-gapped to the larger gap .
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