Boring or bigger sleeve??

Boring or bigger sleeve??

Postby ABW » Sat Mar 11, 2017 1:34 pm

What is the biggest you can make a 4.2. Can you stroke a 4.2?
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Re: Boring or bigger sleeve??

Postby ca434sbc4 » Sun Mar 12, 2017 10:45 pm

Bore wise - the diameter is restricted by available head gaskets. Make the bore bigger - the gasket hangs in the bore.

Stroke - its already under square and rod/bore clearance is tight.

Better to work on the airflow - via porting and cams if you don't want to go forced induction.
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Re: Boring or bigger sleeve??

Postby CNC-Dude » Tue Mar 14, 2017 4:04 pm

Getting a copper head gasket made or even a good quality composition one in a custom bore size is not that expensive, especially if you're boosting the engine and need something a little bit better quality than what's already available.
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Re: Boring or bigger sleeve??

Postby ca434sbc4 » Thu Mar 23, 2017 12:46 pm

The stock head gasket is a multilayer steel type much like a cometic. GM did there homework on it...
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Re: Boring or bigger sleeve??

Postby CNC-Dude » Sat Mar 25, 2017 6:14 pm

I meant MLS, not composition. I"m used to the pre-historic older inlines and am trying to ween myself away from them and those associated with them and join the 21st century.LOL
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