Just Purchased Virgin 340 Short - What to do with Pistons

Mattax said

Factory ever use a piston with 4 valve clearence 'eyebrows'?

That's strictly aftermarket, isn't it?

Click to expand...

1972 and 1973 340's came with 4 valve reliefs in the pistons. Around 8.5 compression ratio.
1968 thru 1971 340's came with 2 valve reliefs in the pistons. Around 10.5 compression ratio.