I was given a set of these heads. Are they any good? Dont know much about them other than they have had a valve job and been ported. Can anyone chime in to if these are better than stock 85 heads?

 

10134392 Phase 2 Cast Iron Bow Tie Head
The Phase 2 Bow Tie cylinder head (casting P/N 14011034) has the highest performance potential of any cast iron Chevrolet head. It is intended for off-highway applications only. 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 flanges. (Phase 1 castings have a raised parting line between the exhaust manifold flanges.) 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.
Technical Notes: The valve spring pockets in cast iron Bow Tie heads are machined for up to 1.50" diameter competition valve springs. The rocker stud bosses are tapped for screw-in studs; studs and pushrod guideplates are not included. Use GM Performance Parts studs P/N 3973416 (3/8") or P/N 3921912 (7/16") and hardened pushrod guideplates P/N 3973418. Use 5/8" hex-head spark plugs with tapered seats and 3/8" reach. A bare casting weighs approximately 42 pounds. Valve seats are heat-treated.

I have them on my 85,w/comp cam, they work great, I think they have great potential once the stock tpi is dealt with

 

Thats great to know. I guess I'll plan on using them. Did they work with the original system. (ie intakes) The prior owner already has put an aftermarket cam in and headers so I figure next is to let it breathe to take advantage of the other mods. What intake setup did you use with yours. i was thinking AS&M long tubes with an accel base. Any suggestions are appreciated.

q2balster for the info.

 

Everything bolted up ok, only problem was I had to remove the heat sheilds from the exhaust manifolds due to spark plugs hitting, with stock plug wires they will clear the headers w/shields removed, but my msd wires hit and burnt so Im sticking with stock wires until I put decent headers on.

 

When did they start making the phase two heads? I want to try to see if these are an original set or phase 2 set.

 

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 flanges.

 

Well it looks like I have an original phase 1 set of heads So I guess these arent as good as the phase 2 set correct?

 

I think the biggest change was the combustion chamber design, I wouldnt htink theres 15hp difference bewtween them if that.