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I have a 64.5 that I just bought and then VIN# says it is a 260 engine. I was looking at it and there is a tag on the intake and it says 289. What is the easiest, fastest way to tell the what engine it is. It has a 5 bolt bell housing and oil filler cap on left vaive cover. The distributor has a oil port also. It still has the generator installed.
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Most likely it is still the 260 or could but unlikely be a 5 bolt 289, Casting number is on the block where the starter is, probably have to take out the starter to see the numbers on the block.
 

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If you find it is a 260 which it probably is, it could have heads, intake etc from a 289. You can take off the valve covers if you want to know what heads are on it, 260 or 289 should be stamped in there.
 
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