302 vibration issue
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Fleet Mechanic
Joined: Mar 2007
Posts: 1,532
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From: northeast Ga
302 vibration issue
using a late 60s 302 , out of a boat that had 400 hours ,trans is a c4 . when we start the motor , there is a bad vibration , so bad it tears the trans apart when driven ,, two trans have been ruined . must be a balance problem , owner thinks the motor is internally balance .I told him to check harmonic pulley to see if it has spun , any ideals ?
Fleet Owner
Joined: Jul 2004
Posts: 27,303
Likes: 1,062
From: NM
The 28 and 50 oz flex plates are definitely not the same. I think 50 oz are late 70's and newer, so if you are sure it's a 60's engine you should be in the clear with a 28 oz. But there are a bejillion combinations of balance, ring gear tooth count, converter bolt pattern, etc. Thanks, Ford! 
https://www.summitracing.com/parts/s...view/make/ford
https://www.summitracing.com/parts/s...view/make/ford
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Fleet Mechanic
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From: northeast Ga
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Phantom of the Phorum
Joined: Jan 2011
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From: Kentucky
These letters are above the starter
More info on what the characters mean: https://www.enginelabs.com/engine-te...ers-1952-1996/
Hotshot
Joined: Oct 2009
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From: Burbank, WA
In the above photo, the engineering number starting with C5 shows the engineering was done in 1965, but the date code 7A25 shows the block was cast in 1967 January 25.
Phantom of the Phorum
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From: Kentucky
Casting codes on early 302's are located behind the starter on the right rear side of the block. You need to find the cast identifier/engineering number, and the date code that looks like a little tag screwed onto the side. The info in the "it still runs" link above isn't entirely accurate.
Hotshot
Joined: Oct 2009
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From: Burbank, WA
You could. There's certainly other websites with more correct info. The worst part was where they said the engineering number was the manufacturing date, which is totally wrong. I hate seeing that kind of misinformation propagated.
Hotshot
Joined: Oct 2009
Posts: 16,199
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From: Burbank, WA
using a late 60s 302 , out of a boat that had 400 hours ,trans is a c4 . when we start the motor , there is a bad vibration , so bad it tears the trans apart when driven ,, two trans have been ruined . must be a balance problem , owner thinks the motor is internally balance .I told him to check harmonic pulley to see if it has spun , any ideals ?
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