Page 706 - 2021-22 Auto Performance_Circle Track
P. 706
EXHAUST HEADER SUFFIX DESIGNATION GUIDE
Suffix
Description Suffix Description
Crate Motor Application Y Tri-Y Header
Straight-Out Short Headers
have short primary tubes for crisp
curve. Available in standard port design.
Suffix
**
Collector Dia. x Length
Collector Dia. x Length
Description
Crate 602
V
“Stepped” Primary Tubes
N
Ford “N” Head Application
18
18° Chevy
CM
SP
Spread Port Application
Long Tube Headers (LH Straight Out/ RH Rear Exit)
Left-side header is a straight-out
style and right-side header is a con- ventional rear exit. Available for standard and spread port exhaust small block Chevys.
Standard
Part No. Description
Angle-Back Headers
Primary Tube Dia.
SCH162B
Chevy Headers
1-3/4"
3-1/2" x 8"
Standard Part No.
Description
Primary Tube Dia.
Collector Dia. x Length
Offered for small block Chevys only in standard port design.
SCH1172
Chevy Headers
1-3/4"
3-1/2" x 8"
SCH1176
Chevy Headers
1-3/4"
3-1/2" x 8"
SCH1176V
“Step” Headers
1-3/4"-1-7/8"
3-1/2" x 9"
‡RH Downswept *RH Upswept
L Series Headers 20-1/4" out on left side.
Standard
Part No. Description
Tri-Y Headers
Primary Tube Dia.
SCH172
Chevy Headers
1-3/4"
3-1/2" x 8"
SCH173
Chevy Headers
1-7/8"
3-1/2" x 9"
Standard Part No.
604 Crate Part No.
Description
Primary Tube Dia.
Collector Dia. x Length
Larry Shaw and Victory
—
SCH1155LCM2
Headers
1-5/8"
3"
—
SCH1155LV3CM-3
"Step" Headers
1-5/8"-1-3/4"-1-7/8"
1-7/8" x 3-1/2"
—
SCH1155LVCM-3
"Step" Headers
1-5/8"-1-3/4"
3"
SCH1156L
—
Headers
1-3/4"
1-3/4" x 3-1/2"
SCH1156LV
—
Step Headers
1-3/4"-1-7/8"
1-7/8" x 3-1/2"
with “stepped” primary tubes delivers increased torque. Available for standard,
spread port or 18° small block
Chevy.
Straight-Out Headers
One-piece headers utilize a straight-out primary tube and collector. Small block Chevy headers are for standard ex- haust ports.
Part No. Description
Standard Spread Port Part No. Part No.
18° Part No.
Description
Primary Tube Dia.
Collector Dia.
Small Block Chevy - Fits Harris, Hoffman, J-Car, Impressive, Bob Pierce, and Victory chassis
SCH1185VY
—
—
“Step” Headers
1-5/8"-1-3/4"
3"
SCH1186VY
SCH1186VYSP
SCH1186VY18
“Step” Headers
1-3/4"-1-7/8"
3-1/2"
Fits Larry Shaw, J-Car and Elite Chassis
SCH1195VY
—
—
“Step” Headers
1-5/8"-1-3/4"
3"
SCH1196VY
—
—
“Step” Headers
1-3/4"-1-7/8"
3-1/2"
Mid-Length Primary Fits BMS, Dirt Works, GRT, Harris, Hoffman, Jet Racing, and Larry Shaw Chassis.
SCH1106VY
—
SCH1106VY18
“Step" Headers
1-3/4"-1-7/8"
3-1/2"
Primary Tube Dia.
Collector Dia. x Length
SCH161
Chevy Headers
1-5/8"
3" x 8"
SCH162
Chevy Headers
1-3/4"
3-1/2" x 8"
Two-Piece Adjustable Headers
Headers have removable collectors and employ a “stepped” primary tube design for increased horsepower and torque. Adjustable feature means existing collectors may be replaced with different slip-over collectors to allow adjustment of engine location.
Primary Collector LH-Style 6 Description Tube Dia. Dia. x Length RH-Style 8
LH-Style 9 RH-Style 8
LH-Style 9H RH-Style 8
Tube Dia. I.D.
Small Block Chevy
Standard Chevy
1-5/8"-1-3/4"
3"x8"
—
SCH161-98
SCH161-98H
Standard Chevy
1-3/4"-1-7/8"
3-1/2" x 9"
—
SCH162-98
SCH162-98H
Small Block Ford
Windsor
1-5/8"-1-3/4"
3"x8"
—
—
—
Dart/“N” Head
1-3/4"-1-7/8"
3-1/2" x 9"
SCH362-68N
—
—
Note: Use chart below as reference for collector styles. Replacement Adjustable Slip-Over Collectors
Style Style Style Style Style 3 6 8 9 9H
SCH162-98
No. of Tubes
LH Style 3
LH Style 6
LH Style 9
Collector Dia.
SCHSO63043
SCHSO63046
SCHSO63048
SCHSO63049
—
1-5/8"
3"
4
SCHSO73543
—
SCHSO73548
SCHSO73549
SCHSO73549H
1-3/4"
3-1/2"
4
704 TRACK
CIRCLE 2021-22
RH Style 8 LH Style 9H
