Part Number

Description

Casting Number

Material

Combustion Chamber

Valve Diameters

Intake Vol. (cc)

Intake Port Type

Exhaust Port

Notes

6260482

Service replacement

6272990 or 14096188

Cast iron

Open 118cc

I: 2.19"
E: 1.88"

325

Rect.

Square

Used on LS-6 and LS-7. Open or closed chamber pistons. Originally produced 1968-71.

12562926

Service Replacement

14097088

Cast Iron

Open 118cc

I: 2.19"
E:1.88"

325

Rect.

Square

Use with Gen Vbig-block engine P/N 12568782-20 "BARE"

12562920

Service Replacement

14097088

Cast Iron

Open 118cc

I:  219"
E: 1.88"

325

Rect.

Square

Use with Gen Vbig-block engine P/N 12568782-20. Complete with springs and valves.

12552888

Service Replacement

10114156

Cast Iron

Open 118cc

I: 2.07"
E: 1.72"

—

Round

Square

Use with Gen VI big-block engine P/N 12361054. Complete with springs and valves.

12363399

Bow Tie performance

12363391

Aluminum A356-T6

Semi-open 110cc

I : 2.19"
E: 1.88"

290

Oval

Square

Standard intake and exhaust port locations. No valves.

12363392

Bow Tie performance

12363391

Aluminum A356-T6

Semi-open 110cc

I : 2.19"
E: 1.88"

290

Oval

Square

Head includes springs and valves

12363390

Bow Tie performance

12363391

Aluminum A356-T6

Semi-open 110cc

I : 2.25"
E: 1.88"

290

Oval

Square

Head includes springs and valves

12363408

Bow Tie NHRA Legal

12363401

Aluminum A356-T6

Semi-open 118 cc

I : 2.19"
E: 1.88"

315

Rect.

D-Port

Legal for NHRA Competition – Replaces RPOL88 Head

12363410

Bow Tie performance

12363401

Aluminum A356-T6

Semi-open 118cc

I : 2.19"
E: 1.88"

315

Rect.

Square

Standard intake and exhaust port locations. No valves.

12363400

Bow Tie performance

12363401

Aluminum A356-T6

Semi-open 118cc

I : 2.25"
E: 1.88"

315

Rect.

Square

Head includes spring and valves

12363425

Bow Tie performance

14044861

Aluminum A356-T6

Open 115cc

I: 2.19"
E: 1.88"

380

Rect.

Rect. w/vane

Second design raised intake and exhaust port. No valves.

10051128

Symmetrical port Bow Tie

10051128

Aluminum A356-T6

Semi-open 72cc

NA

400

Round

Rect.

Evenly spaced intake runners, raised exhaust ports. Pro Stock head. No seats and guides.

10051129

Raw symmetrical port Bow Tie

10051129

Aluminum A356-T6

Semi-open 72 7scc

NA

400

Round

Rect.

Unmachined casting

10045427

Pontiac Super Duty

10045427

Aluminum

Open 91c

I: 2.40"
E: 1.90"

460

Rect.

D-shaped

Pontiac Motorsports head for 600ci racing engines. Guides not installed.

10093386

Pontiac Super Duty

Aluminum

61.4cc

I: 2.40"
E: 1.90"

365

Rect.

D-shaped

Pontiac Motorsports head for all Chevrolet big-block engines.

10093385

Pontiac Super Duty

Aluminum

60.4cc

I: 2.40"
E: 1.90"

420

Rect.

D-shaped

Pontiac Motorsports head for all Chevrolet big-block. No machining.

14044876

Bow Tie

14044861

Aluminum A356-T6

Open 105cc

Not
Machined

380

Rect.

Rect. w/vane

Raised First design "casting only" intake and exhaust.

12480010

DRCE Semi-Finished

24502585

Aluminum A356-T6

Semi-Machined

NA

Rect.

Rect.

Use with 4.900" bore centers

24502585

DRCE Raw casting

24502585

Aluminum A356-T6

Raw casting

NA

Rect.

Rect.

Use with 4.900" bore centers.