CYLINDER HEADS
Chevrolet Big Block 396-454 (Cont.) GM Performance Bowtie Rectangular Port Aluminum Head This head is NHRA legal. and is a replacement for 1969 L88 cylinder heads used on 1969 Camaro and 1968-1971 Corvette big block engines.
GMP12363408
Intake Runner
Comb Chamber Port Type
Valve Angle Stock
Intake Valve 2.190"
Exhaust Valve
Part No.
Description
GMP19331427
Bare, Bowtie Rectangular Port
315cc
118cc
Rect
1.880"
GM Performance High Output Crate Engine Iron Head
GM Performance High Output Crate Engine cast iron cylinder head are designed for use with the 454/502 Gen V, VI big block crate engines. Features high flowing 325cc rectangular intake ports, 118cc open combustion chambers, hardened seats to fit 2.180" intake and 1.880" exhaust valves. Sold individually.
Intake Runner
Comb Chamber
Plug Angle
Port Type
Valve Angle
Intake Valve 2.180"
Exhaust Valve
Part No.
Description
GMP12562925
Bare
325cc
118cc Angled Rect.
15°
1.880"
ENQCH454B
Engine Quest BB Chevrolet Cast Iron Rectangular Port Head The EQ cast iron big block Chevy rectangular port cylinder head can support over 850 horse-
power right-out-of-the-box. Features include; revised water jackets for improved cooling , thicker deck surface, 3-angle valve finished intake seats, radiused hardened exhaust seats and manganese-bronze valve guides. Sold individually.
Intake Runner
Comb Chamber Port Type
Intake Valve 2.250" 2.300"
Exhaust Valve
Part No.
Description
ENQCH454A ENQCH454B
BB Chevrolet, Iron 320cc - Bare BB Chevrolet, Iron 360cc - Bare
320cc 360cc
119cc 119cc
Rect Rect
1.880" 1.880"
FLOTEK BB Chevrolet Aluminum Heads The FLOTEK aluminum big block Chevy rectangular port cylinder heads features include; 121cc combustion chambers, 128cc exhaust runners, thicker deck surface, 5-angle valve finished intake seats, hardened exhaust seat, phosphor-bronze valve guides, swirl polished stainless valves, hi-performance springs, PC seals, hardened locks, steel retainers, 7/16" screw-in studs and guide plates. Intake runner at .625" lift flows, 326.6 CFM, exhaust at .600" lift flows 223.0 CFM. Sold individually.
FTC4075056
Intake Runner
Comb Chamber
Port Type
Intake Valve
Exhaust Valve
Part No.
Description
BB Chevrolet 320, Assembled, 1.46" Spring - 178 Lbs Seat Pressure, .600" Lift BB Chevrolet 320 - Assembled, 1.46" Spring, 205 Lbs Seat Pressure, .700" Lift BB Chevrolet 320 - Assembled, 1.46" Spring, 230 Lbs Seat Pressure, .800" Lift BB Chevrolet 360 - Assembled, 1.46" Spring, 178 Lbs Seat Pressure, .600" Lift BB Chevrolet 360 - Assembled, 1.46" Spring, 205 Lbs Seat Pressure,.700" Lift BB Chevrolet 360 - Assembled, 1.46" Spring, 230 Lbs Seat Pressure, .800" Lift
FTC3055056
320cc
121cc
Rect.
2.250"
1.880"
FTC3055057
320cc
121cc
Rect.
2.250"
1.880"
FTC3055058
320cc
121cc
Rect.
2.250"
1.880"
FTC4075056
360cc
121cc
Rect.
2.250"
1.880"
FTC4075057
360cc
121cc
Rect.
2.250"
1.880"
FTC4075058
360cc
121cc
Rect.
2.250"
1.880"
2018 ENGINE BUILDER CATALOG
165
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