One pair of 3973487 heads for small block Chevrolet

They will fit 283, 302, 305, 307, 327, 350 and 400.

LT1 high performance heads

Date codes H 11 0 and H12 0, August 11th and 12th 1970.

1.94″ Intake valves and 1.5″ exhaust.

75cc chambers

Resurfaced to 80 microns RA

Pressure tested

Guides replaced as necessary

Valves and seats cut and lapped

Valve guide tops machined to .500″ for Competition Cams Teflon positive stop stem seals

Can be supplied with new springs, retainers and locks suitable for your camshaft.