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Username Post: cyl.heads        (Topic#247151)
Valued Contributor
Posts: 3588
Age: 48
Loc: ansley,MS
Reg: 01-09-02
08-09-10 04:24 PM - Post#1958300    

Looking for some info,just got a set of gm heads the cast.# is 14011034.They have angle plugs, 2.02/1.6,screw in studs,64cc chambers.Anybody have any dealings with these?What year made are they still available? Thanks for any info and help.
49 mercury 302 chevy/turbo350
`67 chevyll 6.0/4l60e
`51 ford f-1 355 chevy
`34 ford vicky 383 chevy

Dedicated Enthusiast
Posts: 5188

Loc: south western pa.
Reg: 01-25-00
08-09-10 05:04 PM - Post#1958314    
    In response to cpr

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 offhighway
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 heavyduty
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. no longer available
retired race engine builder,former NASCAR tech inspector. new corvettes owned 1959,1962,1963,1964,1965, 1966,1997,1999,2002,2005, 2008 plus 30+ other chevy cars and trucks along the way. 2008 corvette sold and waiting on a C-7.

Edited by motorman on 08-09-10 05:12 PM. Reason for edit: No reason given.

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