one red rod?
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Senior User
Joined: Dec 2010
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From: wichita ,kansas
one red rod?
so i pulled the 390 out of the truck and pulled it apart and found one the rods was red and the bottom of the piston also ,read the steve christ book and checked on line and could not find anyone else with this problem.the piston tops all look good with little build up ,going to have a machine shop do the heads ,just want make sure the engine is ok before i put her back end and i have been off work so i do not have extra change to do a full on overhall,
i will post more pic's we i get her back together and ready to put back end
i will post more pic's we i get her back together and ready to put back end
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
IIRC this was discussed in another thread and there was no consesus on whether it had any significance or not.
I'd pull the cap on that rod and a couple of others, if they look the same put the caps back on, torque them down and don't worry about it.
I'd pull the cap on that rod and a couple of others, if they look the same put the caps back on, torque them down and don't worry about it.
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Senior User
Joined: Dec 2010
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From: wichita ,kansas
thanks mike i will keep on keeping on , might be a few weeks out on the machine shop so that gives me time to check that out, clean and through some paint at it ,
now i just need to get the headers on order
now i just need to get the headers on order
Tennessee Hillbilly
Joined: Jan 2012
Posts: 196
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From: East TN
Years ago if one(or more) cylinder was bored out of tolerance they had slightly oversize piston/ring assemblies to put in place of a stock size. I've seen main bearings pulled from stock engines also that read .0003-.0008 (3 to 8 ten thousandths undersize) to get the correct clearance.
Not saying this is your answer, just that things like that were done to get engines going and installed in vehicles. This could have also been one that was perhaps replaced at a dealer under warranty? who knows?
I fixed a Jeep a few monthes ago that had a skirt on the piston broken off. The factory piston assemblies were coded A-F according to the size, which varied
from about .002 -.005 oversize.
Measure everything closely to be sure.....Good Luck with it!
Not saying this is your answer, just that things like that were done to get engines going and installed in vehicles. This could have also been one that was perhaps replaced at a dealer under warranty? who knows?
I fixed a Jeep a few monthes ago that had a skirt on the piston broken off. The factory piston assemblies were coded A-F according to the size, which varied
from about .002 -.005 oversize.
Measure everything closely to be sure.....Good Luck with it!
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