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Old 01-02-2018, 01:49 PM   #1
parrisc19844x4_468
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034 Phase II Heads?

I bought these heads from a local circle track racer. I dont have the heads here at home, but the guy building my 400 sent me these pictures. Can someone verify these as 034 phase II. Only mark I can see is the bowtie.

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Old 01-02-2018, 09:30 PM   #2
PGSigns
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Re: 034 Phase II Heads?

Only way to know for sure what they are is a picture of the casting numbers.
Jimmy
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Old 01-03-2018, 02:44 PM   #3
parrisc19844x4_468
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Re: 034 Phase II Heads?

Quote:
Originally Posted by PGSigns View Post
Only way to know for sure what they are is a picture of the casting numbers.
Jimmy
casting number is the same for both phase I and phase II. 034
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Old 01-04-2018, 08:41 PM   #4
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Re: 034 Phase II Heads?

Text is not mine, highlight is. I'd say they're the Phase 2 version based on that.

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.
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Old 01-04-2018, 09:07 PM   #5
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Re: 034 Phase II Heads?

I read that paragraph and look at the picture and think phase 1.

I see a parting line and not a machined bar
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Old 01-05-2018, 03:49 PM   #6
parrisc19844x4_468
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Re: 034 Phase II Heads?

thanks. I was told by the seller they were phase I but he want real sure.
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