How to identify a Chevy 350 block?

[physcult]

My pistons are marked L2403 040 (probably old TWR forged blower pistons) and I need to go the next size up. All numbers have been filed off the block and the heads are after-market World S/R 1 -052.

How do I know if I can take my block out to the next size up? Is + 60 wise on a SBC or should I start looking for another block?

[adey]

for a blower i would personally not be happy with plus 60, i prefer plus 30 as a max on my blown motors.

[physcult]

Looks like I may be in the market for another block then because the piston has 040 stamped into it:mad: Would you look for a roller block?