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#1
02-11-2009, 02:03 PM
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389 catalina motor question
i found a guy who has a 64 389 for sale. the heads and intake and block say its a 64 389. He says its been rebuilt (not by him) and they put $2000 in the rebuild and went .010 overbore. it has a 2bbl intake on it. He doesnt want alot for it, and im wanting to know if the 2bbl 389 motors were any good or not? i was thinking of just changing to a 4bbl intake and go with it.
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#2
02-11-2009, 02:15 PM
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rusty,
I doubt seriously it's ".010" over" unless all the parts were bought NOS from a dealer. Pistons are not "readily available" in .010". .020, .030, .040 and .060" are the common Pontiac oversizes. Not much difference between the 2-bbl. and 4-bbl. engines for the "big car" except cam and induction. What is the price? And what is the application you want it for? Jim |
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#3
02-11-2009, 04:08 PM
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Check the motor mount hole locations. I think they are different on the 64 and earlier blocks. It may not fit your car if its a 65 or newer without modifications.
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1965 GTO 389 Tri-Power 4-Speed  Johnny |
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#4
02-12-2009, 09:03 AM
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Reelfun,
The "2-bolt" mounting flange was first found on the '59 389. It remained "constant" through '69. The belhousing "pattern" is a bit different on pre-64 "A-body" engines (uses 7/16" bolts instead of 3/8) and the starter mounts to the bellhousing instead of the block. There are some other "subtle" differences. Jim |
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#5
02-12-2009, 10:09 AM
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Thanks for the clarification.
__________________
1965 GTO 389 Tri-Power 4-Speed Johnny |
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#6
02-12-2009, 11:05 AM
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he wants 600 dollars for it and i was going to put it in a 64 gto. i was wondering about cam size and HP along with compression ratio. Ive got a 455 that i was going to get rebuilt but i found this 1964 389 and it just got me to thinking..
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#7
02-13-2009, 02:09 PM
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Nothing wrong with going for a period-correct 389, but they're a little more expensive to rebuild since parts like pistons are harder to find. I'm rebuilding a 389 for a customer with a '65 GTO. I found out the original block was punched out .090 over and had .030 400 pistons in it, so the owner wanted a replacement 389- that cost $500, but it was a standard bore and made it straightforward ordering new pistons.
The story behind your 389 sounds fishy to me- .010 over? You might get lucky when you tear down the 389 to inspect it and find it was rebuilt, then all it would need is a rehone and new rings. But if the seller stiffs you and you find a ridge in the cylinders and you're starting at square one. But for $600, a rebuildable but complete 389 is still fair. Geno |
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