Legally upgrade your 604 crate engine with this valve lock set. Valve locks fit beehive springs. Sold as a complete set of 16 half locks (8 pairs) which is for 1 cylinder head. Legal upgrade For GM 604 crate engine For beehive springs Sold as a set of 16 half locks (8 pair) Sold as a set for 1 cylinder head
Must purchase 2 sets if upgrading 1 engine or 2 cylinder heads