My '75 Scamp 383 Build

roadrunnerh said
1968 Factory Service manual (4.2495" - 4.2515")
Number Top Bottom
#1 4.252 4.246
#2 4.252 4.247
#3 4.255 4.250
#4 4.252 4.247
#5 4.252 4.250
#6 4.251 4.247
#7 4.252 4.2515
#8 4.252 4.248
* Pistons 1,5,7,and 6 have a number (casting?) 2863116 inside piston.

*Pistons 2,3,4, and 8 have number 2863115

I read in my 1968 parts book that there were .005" over pistons and standard size. (in addition to .020 and .040 over pistons available.
Do I have some cylinders which were .005" over from the assembly line? The part numbers in my book are 3004524 and 3004525 (.005 O/S).
Can anyone help out with a 1969 Parts book?
This is a 9-17-68 casting block for a 1969 Charger 383 2Bbl.

Some of the performance articles of the period stated that left and right bank OEM pistons were different.
The piston pin was off-set slightly to reduce slap on cold starts, this may account for the different casting numbers you've noted. The performance trick was to swap the pistons to the opposite bank. This was said to slightly reduce friction, thereby increasing power. I don't believe any aftermarket pistons are off-set in this manner.
As far as boring the block, forget it! I mean is this a daily driver that you're expecting 100k mile plus service from?
I hope you and I live long enough to wear this engine out! I do agree that tru-ing the block decks is a good move if you've got the bucks. Just carefully put it together and go have fun!!