07-08-2013, 02:49 AM
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CC Member
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Join Date: Feb 2006
Location: Gore. New Zealand.,
SI
Cobra Make, Engine: DIY Coupe, F/T ,MkIV.
Posts: 808
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Not Ranked
Quote:
Originally Posted by DAVID GAGNARD
Actually all of the Roush/Yates engines used in cup cars use a 3.25 stroke crank......
David
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I thought the idea was to start out at ~4" bore & 3.5" stroke then each time the engines were rebuilt to increase bore & reduce stroke to maintain the 355 cu in, hence virtually everything we see for sale is on its 'last' life so to speak, or have they since found the 3.25" stroke & ~4.185" bore is the better combo and now just going straight to those dimensions... the bigger bore does increase the valve/bore distance.
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Jac Mac
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