Thread: 428 or 390
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12-13-2006 03:28 PM #1
You would also need to check the stroke. A rough measurement can be done through the spark plug hole with a small rod. Run the piston up to tdc, insert the rod and put a mark on it in line with the spark plug thread. Then run that cylinder to bdc, mark the rod at the same point off the plug thread. Measure the distance between the two marks.As you can see from Denny's chart, the 428 and 410 have the same stroke (same crank) but the 390 has a smaller stroke and a smaller bore. You will have to pull a cylinder head to measure the stroke...Yesterday is history, tomorrow is a mystery, Live for Today!
Carroll Shelby
Learning must be difficult for those who already know it all!!!!
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12-13-2006 03:36 PM #2
Thank you guys!
Anyway, can we do something with the numbers?
I will check the block casting number, can it tell anything?






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