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Chevy Small-Block v-8
Service Replacement Heads
These cylinder heads are direct replacements for OEM heads
on 1987-and-newer GM Small-Block V-8 engines. Save time and
worry by replacing tired or damaged cylinder heads with new
ones from GM Performance Parts.
Service Replacement Head Technical Notes:
• Cast-iron
• Use 1.94"/1.50" valves
• Straight spark plug design
• No heat risers provided
The Phase 3 Cast-iron Bowtie Head
The Phase 3 Bowtie cylinder head is a true cast-iron performance
head that’s designed for off-highway, competition use only. Racers
who are required to run a production-style cast-iron cylinder head
can obtain optimum performance with this head because it outflows
all production cast-iron heads. The Phase 3 casting is extra
thick, which allows ample room for port modifications.
93438649
Cylinder Head Assembly With Valves For 290 HP
(not shown)
This cast-iron cylinder head is for use on 350/290 HP crate
engines and Goodwrench base 350 V-8 (P/N 10067353).
• Bare head P/N 93438648
• Standard 6-bolt intake manifold pattern
• 76cc combustion chamber
This head is assembled with the following components:
12550909 Exhaust Valves 10241744 Intake Spring Retainer
10241743 Intake Valves 14042575 Exhaust Spring Retainer
94666580 Valve Springs 10212810 Intake Seals
24503856 Valve Locks 12564852 Exhaust Seals
A
Cast-iron Vortec Cylinder Head (exhaust)
Phase 3 Cast-iron Bowtie Head (exhaust)
B
B. 12480034
Phase 3 Cast-iron Bowtie Head
• Extra-thick walls for porting
• Machined for 2.02"/1.60" valves
• Exhaust seats are induction hardened
• Valve spring seat is machined for 1.50" competition springs
• 184cc intake runner
• 64cc combustion chamber
• No heat riser
• Angled spark plugs (5/8" hex, 3/8" reach, tapered plugs)
• Requires early model intake manifolds
• Valve spring seat is machined for 1.50" competition springs
• Use P/N 12495497 screw-in studs for 3/8" rocker arms
• Use P/N 3921912 screw-in studs for 7/16" rocker arms
• Use P/N 3973418 guideplates for hardened pushrods
Chevy small-block v-8
Vortec Cylinder Heads
An easy way to gain 20-40 horsepower on any 1955-and-newer
Small-Block Chevrolet V-8 (except later-style LT1/LT4 engines
with reverse-flow cooling) is by installing a set of Vortec cylinder
heads. These value-priced cast-iron cylinder heads use modified
combustion chambers and high velocity port technology to provide
improved performance. Vortec cylinder heads significantly outflow
non-Vortec service replacement cylinder heads and earlier OEM
cast-iron heads. These cylinder heads are ideal for applications
up to 350 horsepower, but they require Vortec-specific intake
manifolds.
1967 Camaro SS 350
A. 12558060
Cast-iron Vortec Cylinder Head Assembly
• Completely assembled with 1.94"/1.50" valves
• Uses bare head 12529093
• 64cc combustion chamber
• Straight spark plugs
• No heat risers
• Requires Vortec-specific intake manifold
• Camshafts with more than 0.475" lift require machining
valve guide bosses and checking valve seal to valve
spring retainer clearance
• Can be machined for 2.02"/1.60" valves
• Rocker arm studs can be pinned or drilled and tapped
to 3/8"
• Valve spring seat diameter is 1.28"
• Casting number 10239906 or 12558062
This head is assembled with the following components:
10241743 Intake Valves 10241744 Valve Spring Retainer
12550909 Exhaust Valves 10212810 Intake Seals
10212811 Valve Springs 12564852 Exhaust Seals
24503856 Valve Locks
A
Cast-iron Vortec Cylinder Head (intake)
Phase 3 Cast-iron Bowtie Head (intake)
B
“Smile When You Call It Detroit Iron,” smirked the ads
featuring the first Camaro Super Sport. Right out of
the gate, the ’67 Camaro lineup burst onto the ponycar
scene with a host of performance options that
brought smiles to the faces of performance-car fans
across America. At the heart of those options was the
’67 Camaro SS motivated by the immortal 350-cubicinch
Small-Block engine—an engine displacement
created just for the new Camaro.
There were more than 80 different factory options
for the ’67 Camaro, but the 350 SS was the classic
combination. Supported by heavy-duty springs and
shocks, and fed by a Rochester four-barrel carburetor,
the SS 350’s 295-horsepower Small-Block propelled
this classic to 15.4-second quarter-mile ETs, as tested
by Motor Trend. Test drivers had a hard time putting
down all 380 lb-ft of torque from beneath the SS
hood. It wouldn’t be the last time tires had trouble
handling the output of a Camaro SS.
A
Cast-iron Vortec Cylinder Head (combustion chamber)
Phase 3 Cast-iron Bowtie Head (combustion chamber)
B
146 Buy online at www.gmperformanceparts.com
Additional components required
for installation. See page 155.
Available for purchase online at
gmperformanceparts.com
147