GM Performance 034 Bowtie Heads Phase 2 SBC 350 Small Block Chevy 14011034

Description

GM Performance Parts (GMPP) 034 Bowtie Heads Phase 2 part #14011034.
2.02 intake valves, 1.60 Exhaust valves, 184cc intake runners, 64cc combustion chamber.
Unmolested heads, no cracks, repairs, broken bolts or pitting, never milled or ported. Removed off a running engine with only a handful of passes. Heads have Manley double beehive springs that can handle up to .600 lift. Manley Stainless intake and exhaust valves and GM Performance rocker studs and guide plates. Springs look to be in great shape, valves have some carbon build up but don’t look bad. Heads may be usable as is but I would take them apart and inspected at the very least. Springs and valves may be reusable but again I’m making no guarantees on that have them inspected when they are taken apart. May need valve work may not I haven’t taken them apart so I don’t know. The heads themselves are in great condition. They have very little use they were on a drag car that saw no street use and only had a handful of passes with the engine these heads were on. They are great flowing heads in stock form but with some port work they can flow crazy numbers.
The Phase 2 Bow Tie cylinder head (casting P/N 14011034) has the highest performance potential of any cast iron Chevrolet head. Although the Phase 2 cast iron Bow Tie cylinder head has the same casting number (14011034) as the Phase 1 head it replaced, there are several significant differences between these two heavy-duty cylinder heads. The Phase 2 cast iron Bow Tie head can be identified by its redesigned outer water jacket wall with a machined bar between the exhaust manifold flange. The area around the tapped water temperature sensor hole is also machined flat on the Phase 2 head. The Phase 2 Bow Tie head has a revised combustion chamber design with a true volume of 64cc's. The quench areas beneath the spark plugs are filled to increase compression in competition engines. The intake valve seats are machined for 2.02" diameter valves; the induction hardened exhaust valve seats are finished for 1.60" diameter valves. The intake and exhaust ports are identical in Phase 1 and Phase 2 cast iron Bow Tie heads. The 184cc intake runners will satisfy the airflow requirements of most competition engines while enhancing throttle response and mid-range torque. In unmodified form, the Phase 2 Bow Tie head will flow more air than any production cast iron small-block head. Extra-thick wall sections allow the ports to be enlarged to increase their flow capacity. The manifold heat riser passages are deleted in Phase 2 Bow Tie heads to produce a cool, dense intake charge