For Sale: Pair of Big Block Chevrolet Cylinder Heads casting number 3993820. These heads are very similar to 353049 or 336781. Heads are oval port ready to bolt on with new bronze guides, hardened seats, 2.19/1.88 stainless valves, GM 454/502 HO new valve springs, teflon seals, ARP rocker studs(new), and GM guideplates and the heads are open chamber and have been surfaced .010". All new stuff, never ran.

Date codes on these heads are A-12-71 and A-14-71.

I will ship or deliver (see below) these heads as pictured, or assembled.

Springs are 1.480 Diamater, Installed at 1.880 = 110 lbs, coil bind at 1.270. These are good for .560 Lift flat tappet camshafts.

I have close to $650 in these Heads, I'd like $550 or best offer + Shipping. Pay Pal is my preferred method of payment, but I am flexable. Heads are located in West Plains, Missouri, and I will deliver within 75 miles.

See this link for pictures: www.lt1swap.com/bbcheads/index.html