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  #21  
Old 05-18-2022, 09:03 PM
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Stan Weiss Stan Weiss is offline
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Quote:
Originally Posted by Gary H View Post
Did the change result in a larger bore than 4.375? Or was it done to unshroud the valves?
A standard bore spacing cast iron block should be about to go to 4.4X I would guess the 0.040" over bore spacing in a race application could be run very close or at 4.500" bore.

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  #22  
Old 05-19-2022, 08:51 AM
mgarblik mgarblik is offline
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We ran a stock iron IA II at a 4.425 bore. It was very thin at that bore. It did not crack any cylinder walls and ran OK at that bore. We began at 4.375 and as we killed it numerous times learning how to tune 600 HP nitrous stages, it ended up at that larger bore from many, many rebuilds. I am not recommending this bore size, but it worked for us.

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  #23  
Old 05-19-2022, 01:00 PM
cfmcnc cfmcnc is offline
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Larger bore to unshroud valves and more cu in.

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