Should I go to a 4.3" stroke or stay 4.15"

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Should I go to a 4.3" stroke or stay 4.15"

Post  512Fairlane on September 23rd 2012, 10:16 pm

I don't have the motor completely apart yet after my unfortunate mishap at Indy last weekend but I know I will be buying a new crank for sure. All other things being equal (P-51 heads and possibly the same cam) how much more torque/hp could I expect going to a 4.3" crank from my 4.14". I was planning on getting the cast crank out of there eventually but now I know I need something different. I'm hoping the cam wasn't hurt but I'm not sure yet. If I can save the block it would have to be a 4.440" bore unless there is enough meat left to go 4.5". If I have to use my other block it will stay .030" over.
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Re: Should I go to a 4.3" stroke or stay 4.15"

Post  c.evans on September 23rd 2012, 10:49 pm

Now would be a good time to go to the 4.300" stroke crankshaft. You'll be glad you did.

Charlie

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Re: Should I go to a 4.3" stroke or stay 4.15"

Post  dfree383 on September 23rd 2012, 10:52 pm

Go 4.5 if you buying a new one and don't already have the 4.3.
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Re: Should I go to a 4.3" stroke or stay 4.15"

Post  Dave De on September 23rd 2012, 11:09 pm

As long as the compression height is 1.35 so if you have 6.7 rods go 4.5 stroke. If you have 6.8 rods then go 4.3 stroke.
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Re: Should I go to a 4.3" stroke or stay 4.15"

Post  richter69 on September 23rd 2012, 11:16 pm

I like 4.3 cranks.
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