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Old 09-04-2008, 06:12 PM
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307 or 350

1970 gmc.......small block with a 2 bbl.......without being able to see casting #'s on the back of the block....any other quick visuals to determine 307 or 350......
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Old 09-04-2008, 06:53 PM
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Harmonic balancers are the best way to tell. 350 balancer is solid all the way around and about 1.25" wide x 6" in dia. 307 will be narrower and smaller in dia.
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Old 09-04-2008, 07:54 PM
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Shine a light on the rear of the block on the drivers side and get the casting numbers.
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Old 09-04-2008, 08:34 PM
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Did a 350 in a pickup even come with a 2 bbl in 1970? There should be a sticker on the back of the glove box door that lists the options as they were originally installed from the factory, at least that's where it is on the Chevys. It may or may not still be there. Of course that sticker only helps if the truck still has the original engine.

There is also a small pad just in front of the passenger side cylinder head that should have some numbers stamped on it. Post those and somebody can help you decode them.
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Old 09-11-2008, 06:06 AM
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307 or 350

is the carb a larger base or small base 350 use a larger base carb and 307 like 283 use small base carbs an yes 350 on trucks had 2 barrles.
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Old 09-11-2008, 12:50 PM
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In front of the passenger side head is a pad on the block with stamping numbers. List those.

And since its a truck, reading the block casting number on the back is easy. Get a brush and a can of carb cleaner and scrub it off.

Numbers are the only reliable way to tell.
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Old 09-11-2008, 04:31 PM
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answer might be as simple as a little white sticker on the core support area right on top...but that is probably not there. get a mini mag light and a small wire brush with a magnifying glass. hold the mini mag in your mouth and look at the deck in front of the passenger head while you scrape that area clean. get the suffix code and look it up online


http://www.73-87.com/chevy_ids/scmenu2.htm


i know it says 73-87 but it has more
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