.020 over 347
 

got my 347 out, took it to the machine shop. said apparently it had a lot of dirt in it, so right off the bat they replaced the main bearings, line honed it, resized my rods, and now apparently my cylinder walls are bad so they gotta take it out to .030 over. i was surprised when he said this because i did not know you could make a 347 with just .020 over. is this engine not actually a 347?

are the skirts on the piston walls notched at the bottom for rod bolt clearance??

i dont believe they were.

EDIT: it had eagle h-beam rods if that makes any difference.

hmmm .020 over, no notched piston cylinder skirts.........hmmm doesn't seem like a 347, maybe a331, better see if you can get a part number off the rods or crank

okay i will try tomorrow when i goto the machine shop to drop off the windage tray. the machinist called and told me the crank was stamped from 1999 so apparently thats when the currently assembly was put in. i also found a ad for the car from july of last year when the car was still in florida and that said it was a 347 too but i guess its just been a long chain of mis-informed people.

OK here is math, it does not lie. Bore x bore x stroke x .7854 x number of cylinders = displacement. Ask machine shop for measurements break out the calculator.

A 347 would have a bore size of 4.030.
Have somebody measure the pistons...........

The rods are the same size either way, look on the front of of the crank and get the part # stamped on it. It will either be a 3.25 or a 3.4 stroke crank.

If it is from the year 99 I doubt it is a 347

they really were not all that popular back then with the shorter rod and the motor would most likely us a lot of oil from the pin intersecting the oil ring

Something isnt right either you were told its something its not or the machine shop didnt measure right.