MLP00Z28

iTrader: (4)

I have seen awsome numbers on 317 ported heads, the bad thing is I have NA engine and looking forward to 11.5:1 CR, could you mill them to 60cc or 61cc without having problems or would you weld them instead?

gao8302

iTrader: (12)

Are you building a motor because you could go with a domed piston. 317s are 71cc to begin with. You would be better off with a set of 243 heads. They flow almost the same as the 317 but are 64-65cc. If you need a set of 317 i have a set for sale.

MLP00Z28

iTrader: (4)

I have a set of 317 already, just not sure if they'll work for my app

gao8302

iTrader: (12)

317= low CR for FI
243=high CR for NA

You would have to take a hell of alot off to make them work and your piston to valve clearance would suffer. Taking that much off for cr would kill those heads. They dont come with that thick of a deck to begin with.

santiago

iTrader: (28)

i milled mine to 66cc i didnt wanna go anyfurther.

MLP00Z28

iTrader: (4)

Well I'll take them to the shop and see how much thay can shave, if anyone has a lower than 66cc 317 I'd like to know about it, thanks

MLP00Z28

iTrader: (4)

TTT for the night crew

orangeapeel

iTrader: (18)

I would just sell them and go with a 243 or 241 instead and have them .030'ed. would work much better for achieving your CR goal.