Bore size
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74 inch motor - 3-7/16 bore 3 -31 /32 stroke
80 inch motor -3 -1/2 bore 4-1/4 stroke
3-5/8 bore requires an over size engine block as the cylinders do not just slide in - but the 74 and the 80 use the same block, as the bore on the 80 inch is a .060 over piston bore in a 74 cylinder, but the rods have a different length so it all goes
if you clean the top of your piston carefully, it will have the over bore size on it, and I can give you the correct hastings ring set numbers to get
80 inch motor -3 -1/2 bore 4-1/4 stroke
3-5/8 bore requires an over size engine block as the cylinders do not just slide in - but the 74 and the 80 use the same block, as the bore on the 80 inch is a .060 over piston bore in a 74 cylinder, but the rods have a different length so it all goes
if you clean the top of your piston carefully, it will have the over bore size on it, and I can give you the correct hastings ring set numbers to get
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NELS (12-30-2017)
#5
John , you are the man. Thank You. Top of piston has a zero . I believe it should all be stock as its under 10k miles. Must have loaned out all of my stuff over the years and it didn't come back. Ridge reamer ( although there isn't a ridge) cyl. hone , but do have the ring compressor. I was in automotive for many years but haven't done a Harley since my '47 Knuck. I really do appreciate all your help.
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NELS (12-31-2017)
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