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Old 12-03-2010, 07:02 PM   #1
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Question Which engine do I have?

Alright so I finally found and purchased a 67 that according to the owner had a swapped 302 from a previous owner after the orig 289 had crapped out. Upon removing the valve covers today to do the gaskets I found "289" stamped into the heads. Is the block a 302 block with 289 heads and an intake? How do I figure out what I have?
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Old 12-03-2010, 07:31 PM   #2
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The block will have a casting number on it, but it is hard to see because it is behind the starter.

If you can read it, you will know what the block is. It sounds like you have a 289, but it could be a 302 block with 289 heads. Hmm, for that matter, I think some folks were stroking 289s to be 302s back in the day. If that is the case, even the casting number won't really tell you what it is!
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Old 12-03-2010, 07:38 PM   #3
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Alright, I'll climb under and take a look. Pretty sure this isn't stroked though, it doesn't look like it was owned by anyone into modding since everything is almost bone stock. I'm thinking its prob a 302 with the 289 heads, will update tomorrow when I climb under it.
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Old 12-07-2010, 01:27 PM   #4
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Quote:
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Alright so I finally found and purchased a 67 that according to the owner had a swapped 302 from a previous owner after the orig 289 had crapped out. Upon removing the valve covers today to do the gaskets I found "289" stamped into the heads. Is the block a 302 block with 289 heads and an intake? How do I figure out what I have?
The only way you are going to know the displacement for sure is to measure the stroke. 289s have a 2.87 inch stroke and 302s have a 3.00 inch stroke. Basically an 1/8th inch difference.

You can easily measure the stroke using a piece of 1/4in wooden dowel about 6in long. Remove one spark plug and place the dowel into the cylinder until it bottoms (rests) on the top of the piston. Slowly turn the crankshaft clockwise by hand using a breaker bar until the dowel is at its lowest point of travel. Make a pencil mark on the dowel where it is even with the top of the spark plug hole. Then slowly turn the crankshaft until the dowel is at its highest point of travel and make another mark. The distance between the marks is the stroke. Take your time and measure carefully (an assistant is very helpfull for this procedure) as an 1/8th inch isnt much.

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Old 12-07-2010, 08:52 PM   #5
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Alright, thanks Paul for that idea, seems like I'm going to have to go that route. I spend a half hour looking for casting number but couldn't see anything near the starter (maybe after some degreasing it'll reveal itself) found some number on top of the motor in the back drivers side right where the intake ends, pretty hard to make out though, will have to check with better light next chance I have.
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Old 12-07-2010, 09:05 PM   #6
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Quote:
Originally Posted by 94gtstang50 View Post
Alright, thanks Paul for that idea, seems like I'm going to have to go that route. I spend a half hour looking for casting number but couldn't see anything near the starter (maybe after some degreasing it'll reveal itself) found some number on top of the motor in the back drivers side right where the intake ends, pretty hard to make out though, will have to check with better light next chance I have.
Yes, just measure it using the dowel. That seems to be a good method!

Next time you have the starter out you will be able to see it pretty clearly. The starter pretty well hides it.
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Old 12-08-2010, 10:04 AM   #7
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Yea, between the starter and the manifold its pretty well hidden, lol.
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Old 12-08-2010, 10:57 AM   #8
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Or drop the oil pan and check the crank casting number on the front counterweight.
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Old 12-10-2010, 12:42 PM   #9
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In reality you don't need to know if the guts are 289 or 302. It's basically all the same. In 67 they were using the last of the 289 stuff so you could have gotten a combination of parts. Not sure but the VIN is supposed to be stamped on the block for 67 (maybe started in 68). Look on the flat machined area by the firewall below the head.
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Old 01-06-2011, 10:08 PM   #10
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If it has 4 bolts holding the lower pulley on its a 302. if it has 3 it could be a 289 or early 302
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