GMP SBC Head

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Part #	12558060	25534351	25534371	25534445
Cast #	10239906 12558082	25534351c		25534371c
Valve		Small	Large	Revised
	Stock	Vortec	Vortec	Lg Vortec
Intake	Vortec	Bow-Tie	Bow-Tie	Bow-Tie
.100"	62	67	63	60
.200"	133	136	133	132
.300"	179	182	182	198
.400"	218	223	228	247
.500"	211	251	258	279
.600"	213	240	255	281
.700"	217	240	261

Exhaust
.100"	47	53	50	45
.200"	99	100	100	99
.300"	128	128	134	138
.400"	139	145	154	167
.500"	143	152	168	184
.600"	143	164	168	192
.700"	145	166	169

Port & Combustion Chamber Spec's
Intake	170 cc	181-186 cc	214-215cc	225cc
Exhaust		66 cc	84 cc	77 cc
Chamber		65 cc	65 cc	65 cc

Notes:
Stock Vortec head used 1.94" & 1.50" valves.
Fast Burn & Bow-Tie Vortec heads used 2.00" & 1.55" valves.
Vortec Bow-Tie heads used Manley stainless valves.
Most aftermarket use Larger 2.02" & 1.60" valves.
Revised Vortec numbers with 2.00" / 1.55" valves.

Part # 25534445 - Bare Head

Part # 25534446 - Complete Head

The bow-tie version of the Iron Vortec cylinder head has been updated with 65cc combustion chambers, 225cc intake runners and 77cc exhaust runners. Designed for a 2.00 inch intake valve and 1.55 inch exhaust. These heads are a direct replacement for many performance applications.

Complete Head Includes:

25534407 Intake Valves

25534408 Exhaust Valves

12551483 Valve Springs

12552126 3/8" Rocker Studs

10212808 Valve Spring Retainers

10212810 Valve Stem Seals

24503856 Valve Locks

Additional Features Include:

No Heat Risers

Hardened Exhaust Valve Seats

Dual Bolt Pattern Valve Covers

Dual Bolt Pattern for both Vortec and early model Intake Manifolds.

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