Ok all you Engine guys. Come across something today kinda got me stummped and also interested all at the same time. Got a 327 in on trade sapose to run ( never herd it run ). so me being me i tore it apart to see how i screwed my self. LOL well all looks good has some good parts to it BUT. 1,3,5,2 are .030 and 4,6,8,7 are standard. Now this engine has been balanced and there is no signs of it ever comming apart from a blow up or anything. So i am trying to figure out is this some old guys idea gone wrong or is it some sorta racers way of making power or Lots of RPM. Not sure where it would help anything or do any good but just seams to be to " on purpose " to be a mistake on the builders part. Come on weve all built an engine with a case of beer before but could you really screw one up the bad and eavenly all at the same time.
Its stamped .030 on the 4 of the pistons. Just kinda odd that eaven with there being diffrent size pistons in it i have seen that. But to be placed in the block the way they are is where its strange to me. Then to have the 2 bolt to 4 bolt conversion on it ( which i did not state above ) and to be all balanced out that can't be a Autozone motor.
got out the mic 4.00 on the standard and 4.279 to 4.299 on the 30 over side i dont have an actual bore scope all i could use was my mic on the top ridge. There is no build up on the ridge as the motor does not have much run time on it.
Yep it is. Casting number shows 68 to 79 350 or 327 ( 3970010 ) i just went with the 327 just because i had my hopes up when i got it. lol Not going to pull the crank out to check any further at least not till i get to here it run then maybe i will.
This is common for a part store reman.. As far as balancing, that is easy for a shop. It use to be a way to cheat on a "stock" class car, leave #1 stock and bore the rest. Becouse tech would only check #1, thats why now they check cylinders at random.
What you can get by with, on an internal balanced motor, seems to be a lot. Heavier .030 over popup domed pistons, and not be balanced, and then take it to 8,000rpm, etc. I ran a 273 crank in a .040 over 340 motor for 18 years, street, and strip use. It did shake some at 7,200rpm. I took a Chev 400 external balanced motor, in to be balanced, and they had a fit. I had damaged a piston, and bought a new one, and it was 31 grams too heavy. That is about an once, and they said the piston cannot be lightened that much. The shop said that the pistons can be heavy or light, but they must be the same. How can you call a Chev 400 balanced anyway, with over three pounds on the outside of the Flywheel.