GM Performance Parts GM Crate Engines
GM Crate Motors

CHEVY SMALL-BLOCK V8
CYLINDER HEADS

Part Number

Description

Casting Number

Material

Intake Runner Volume (cc)




Combustion Chamber
Volume (cc)

Valve Diameter

Spark Plugs

Heat Risers

Notes

10125377

Cyl. Head w/valves

14101083

Iron

64

I: 1.94"
E: 1.50"

Straight

Yes

350 285 HP service head w/valves & springs.

10159552

Cyl. Head
Bare

14011083 14096217

Iron

6 4

I: 1.94"
E: 1.50"

Straight

Yes

350 /300 HP

12480092

Service replacement

3991492

Cast iron

157

64

I: 2.02"
E: 1.60"

Straight

Yes

pushrod guideplates.

12558060

L31 Service w/valves

10239906 or12558062

Cast Iron

170

64

I: 1.94"
E: 1.50"

Straight

No

Vortec Design Port w/valves & springs.

12529093

L31 Service No valves

10239906 or12558062

Cast Iron

170

6 4

I: 1.94"
E: 1.50"

Straight

No

Vortec Design Port less valves

88958692

Bow Tie

3991492

Cast Iron

157

6 4

I: 2.02"
E: 1.60"

Straight

Yes

For leaded Fuel No Valves

12480053

Bow Tie Phase II

14011034

Cast iron

184

64

I: 2.02"
E: 1.60"

Angled

No

Off-highway cast iron head.

12480034

Bow Tie Phase III

12480034

Cast iron

184

64

I: 2.02"
E: 1.60"

Angled

No

Off-highway cast iron head.

25534351

Vortec
Bowtie

25534351C

Cast iron

175

65 I: 2.00"
E: 1.55
Straight
No
Vortec design
small port bare.

25534321

Vortec
Bowtie
25534351C Cast iron

175

65 I: 2.00"
E: 1.55
Straight
No
Vortec design
small port w/valves

25534371

Vortec
Bowtie
25534371C Cast iron

206

65 I: 2.00"
E: 1.55
Straight
No
Vortec design
large port bare

25534431

Vortec
Bowtie
25534371C Cast iron

206

65 I: 2.00"
E: 1.55
Straight
No
Vortec design
large port w/valves

12556463

Corvette Design for 350 HO service engine

10088113

Aluminum

163

58

I: 1.94"
E: 1.50"

Angled

No

Assembly with springs, valves, studs, and no guideplates.

12363287

LT4 service only

12555690

Aluminum

195

54.4

I: 2.00"
E : 1.55"

Angled

No

For LT1 or LT4 usage only

12497186

Fast Burn No valves

12367713

Aluminum

210

62

I: 2.00"
E: 1.55

Angled

No

Fast Burn. No valves.

12464298

Fast Burn w/valves

12367713

Aluminum

210

62

I: 2.00"
E: 1.55"

Angled

No

Fast Burn w/valves & springs. Vortec design.

24502569

CNC Machined

10134363

Aluminum

258

65

I: 2.150" E: 1.620"

Angled

No

18° valve angle; for 9.1 compression

24502580

Bow Tie High-Port

10134363

Aluminum

215

60

N/A

Angled

No

18°valve angle; no seats, guides; for 9.1 engines.

12370855

Bow Tie High Port

10134363

Aluminum

215

60

N/A

Angled

No

18°valve angle; no seats, guides; for 9.1 engines x-ray head. Hipped.

24502582
Discontinued
For Reference Only

Bow-Tie CNC High Port

10134363

Aluminum

245

65

I: 2.150" E: 1.620"

Angled

No

18° CNC Ported for 9.1 Engines

24502615

Bow-Tie

10134363

Aluminum

210

35 to 37

N/A

Angled

No

15° valve angle; no seats,guides.

24502517

Splayed Valve

10185040

Aluminum

240

45

N/A

Angled

No

Splayed Valve design

12480146

Splayed Valve

10185040

Aluminum

240

45

N/A

Angled

No 

Semi-Machined

12480147

Splayed Valve

10185040

Aluminum

240

45

N/A

Angled

No

Semi-Machined

12480011

SB2.2

12480011

Aluminum

284

48

-

Angled

No

8° Exhaust

12480021

SB2.2 CNC Ported

12480011

Aluminum

287

54

I: 2.150" E: 1.625"

Angled

No 

CNC w/seat & guides

 


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