HELP! what is the difference between 302 & 351 distributor ? - Vintage Mustang Forums
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Old 07-29-2008, 09:16 AM   #1 (permalink)
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I think I have been sent the wrong dizzy. I mic'd my OEM 302 distributor base (where it slides into the block) and it measures exactly 1.500".

The new dizzy won't even go down into the distributor hole. The base on it measures 1.546" - or 46 thousandths of an inch over.

Is this a machining error - or do I have a non 302 dizzy ?
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Old 07-29-2008, 09:59 AM   #2 (permalink)
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351 dizzy is taller than the 302 dizzy due to taller block.
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Old 07-29-2008, 11:04 AM   #3 (permalink)
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Old 07-29-2008, 11:13 AM   #4 (permalink)
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The only other difference is the diameter of the oil pump shaft. IIRC, the 351W has a 3/8" drive shaft, whereas the 302 is only 5/16".
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Old 07-29-2008, 11:15 AM   #5 (permalink)
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The gear is different too, I believe.
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Old 07-29-2008, 02:12 PM   #6 (permalink)
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It rotates in the opposite direction, I'm told. If so, it's the gear.
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Old 07-29-2008, 03:23 PM   #7 (permalink)
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The gears should be the same, except for hole in the center where the dizzy shaft goes through the gear. The engines rotate the same direction, so the teeth pattern are the same. You can swap cams with a 302 and 351W with no problems. When I was running my 351W, the cam was for a 289/302. I just had make sure I had the correct firing order.
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Old 07-29-2008, 05:40 PM   #8 (permalink)
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So, basically it must be a maching / tollerance problem...
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