351c Short Block screw Up - MustangForums.com


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Old 07-28-2013, 04:18 PM   #1
5.0liter_rice_eater
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Default 351c Short Block screw Up

So, I picked up a 1972 Q-Code 4v 351c to drop in my 1986 GT. The shortblock had been balanced, blue-printed, bored .30 over, etc. Basically a complete machine shop freshening up, but that was 7 years prior to me purchasing it.

Last night I disassembled the short block to make sure everything was in good order still. I marked each piston's orientation in the block (arrow pointing foward), and scribed a line in the base of the rods and caps to keep them paired.

However, i forgot to number the pistons to remember which cylinder they belong to... Basically what i am trying to find out is can i put it back together (possibly mixed up order) without it shaking itself apart when i fire it up? Or do i need to take somewhere to have it re-balanced? Any help would be appreciated. Thanks guys.

Last edited by 5.0liter_rice_eater; 07-28-2013 at 04:19 PM. Reason: words...
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Old 07-28-2013, 05:00 PM   #2
Duncan_GT
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My shop told me it doesnt matter. However, mine is internally balanced. I believe as long as the bob weight stays the same, you are good to go
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Old 07-30-2013, 04:05 PM   #3
rmodel65
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if its truly balanced then they should be close enough to be smooth probably smoother than any factory assembled mass produced engine
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Old 07-30-2013, 04:40 PM   #4
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Just make damn sure they're facing the right direction, especially if you have valve relief pistons
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Old 08-21-2013, 09:43 PM   #5
5.0liter_rice_eater
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Thanks for your help guys. Luckily I marked them for the direction. The pistons are cut so I'm going to have to make sure they are correct to clear the cam I plan on running. Thanks again.
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