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Old 06-19-2006, 09:44 PM
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66geeto 66geeto is offline
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Default motor blown on break-in, machinist's fault

Well to say the least, this has been the worst week of my nearly 21 years of existence on this planet. I have been working on my 66 gto since i was fifteen putting any reasonable money i could make (started sweeping the shop floor in a local body shop when i was 14 and they couldn't pay me so they tought me what i could learn and bought parts for me) and last weekend I finally had the chance to break the cam in and hear it run. After 4 min at about 2000 rpm i heard the most awful noise ever. the motor wouldn't turn afterwords, I removed the spark plugs to find that the number 7 piston does not move in the sleeve as i turn the engine over (got it to turn it turns freely now but it can't make a full revolution). So i'm assuming the machinist didn't torque the last rod cap. Which is beautiful. #s matching 389 block for my car and it is bored over to the 400 specs so there is no bore left on it if it's messed up. I would give more details but I am not going to tear it apart until my machinist comes and sees the whole set up....(oil in the pan water in the rad. i put top end on ok.)
He gave it to me as a balanced shortblock and assembled it from there. I don't think the rod could have snapped, can a stock pontiac rod be that soft? and if it messed up my original block how much money am i out in the long run so i have a few more bargaining chips when i call tweedle dumass.

 


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