Around 250. Stock 230. With headers and different intake, might get up to 270. Just an educated guess...It has factory cast iron heads.....And stock pistons. 67 was more desirable in that the piston height, compared to the deck, is favorable. Not to far down in the hole...10 to 1 comp ratio...I cc'd the heads, 62 cc. 714 heads are same as 302 heads. Casting number. Swirl port and hardened seats...