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Shovelhead help

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Old Nov 19, 2018 | 12:34 AM
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Tony Sullivan
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Default Shovelhead help
I bought a shovelhead and was told it's a 93in. Tore the top end down and it Has a 4in stroke and 3 5/8 bore with 5.530 long cylinders . Pistons and cylinders are toast and have to be Replaced. What combination can I go back with using the 4in stroke
 
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Old Nov 19, 2018 | 05:59 AM
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Sure it is not a 3 31/32" stroke? (74"stroke)
The cylinders can be bored.
Scott
 
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Old Nov 19, 2018 | 06:30 AM
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Originally Posted by Hillsidecycle.com
Sure it is not a 3 31/32" stroke? (74"stroke)
The cylinders can be bored.
Scott
I'm sorry yes 3 31/32 stroke x 3.625 bore It just looked funny with the piston deck way down in the cylinder. Like .600 from top of fire ring. One cylinder is busted . Would it be better to have 5.330 cylinder length to get the compression up instead of 5.530 length?
 
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Old Nov 20, 2018 | 10:50 AM
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The lack of compression in that combination negates all goodness of the larger bore.
IF in need of a crank whatsoever, now would be the time as long as the broken fin(s?) would not be an eyesore.
Scott
 
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Old Nov 20, 2018 | 05:00 PM
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Would there be any issues using the stock 74 cylinders since the cases and heads have been cut for the big bore cylinders ?
 
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Old Nov 23, 2018 | 05:30 AM
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Last edited by cficole; Nov 23, 2018 at 05:35 AM.
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Old Nov 26, 2018 | 06:21 AM
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Originally Posted by Tony Sullivan
Would there be any issues using the stock 74 cylinders since the cases and heads have been cut for the big bore cylinders ?
We do not subscribe to that, but know of folks that have done it w/o issues.
Scott
 
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