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Old 03-17-2012, 12:13 PM
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1959' Pontiac 336

Allright i was given a V8 engine. I know it came out of a 1959 GMC (log truck) if i remember correctly it was called a 370? im told the engine was a Pontiac 336. thats about all i know. im interested in finding out more about it and also looking for parts.

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Old 03-17-2012, 01:06 PM
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Look at the date codes to determine the year. A 370 would have been a correct size available for 1958. The 389 was first built in 1959. The 336 was called the 326, even though it was actually a 336 CID . It was made in 1963 IIRC. It was a cheater as it was really 10 CI bigger than it was supposed to be.
Date code and casting number will tell you what block/CID you have.
The 370 was a screamer. My dad had one when I was a kid and my oldest brother was allways hotwiring it and scalding the tires off.

Last edited by latech; 03-17-2012 at 01:16 PM.
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Old 03-17-2012, 02:53 PM
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In 1959, although Pontiac built the first 389, the engines used in GMC trucks had a smaller bore and were actually a 336.

Last edited by latech; 03-17-2012 at 02:55 PM. Reason: Other.
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Old 03-17-2012, 07:34 PM
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The Valve covers says GMC. i just confirmed with my uncle the truck was a GMC 370 and hes sure the engine was called a 336. the block reads 531395 and D28 if i remember correctly, i apologize im in forth bragg NC and the engine is back home in northern NY. do u know where i can find any other info on it? or parts as far as ik all it has is a fly wheel and belt housing.
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Old 03-17-2012, 09:31 PM
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Ifound this at Wikipedia:

GMC's own V8 was the 336-cubic-inch (5.5 L) OHV/pushrod engine. It used a 3.875 in (98.4 mm) bore and was produced only in 1958 and 1959.

While both the '58 and '59 GMC V8 engines were advertised as 336-cubic-inch (5.5 L), the '58 version was based on the Pontiac 370-cubic-inch (6.1 L), but with a smaller 3.875-inch bore giving 336.1 cubic inches (5,508 cc). The '59 version was based on Pontiac's 389-cubic-inch (6.4 L), but with a smaller 3.78-inch bore giving 336.9 cubic inches (5,521 cc).
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