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MAIN CAP GIRDLES
PRW Steel Main Cap Girdles
PRW Billet Steel Main Girdles are engineered to help eliminate the block flex and cap walk that occurs as a result of stress while under extreme loads, including nitrous oxide power bursts in high-performance engines. PRW main girdles are manufactured from premium 1045 billet steel. These kits include high-quality steel studs, spacers, and nuts (limited machining may be required for proper fitment).
PQX0935000
MAIN BEARING CAPS
Billlet Speedworks Billet Main Bearing Caps
Billet main caps offer increased bottom end strength. Many of the billet caps listed are for converting a two-bolt main block to the more durable four-bolt main configuration.
PGESB350CFS4
Steel Main Caps
Ductile main caps use splayed outside bolts which pull from the side walls of the block instead of flimsy main web area. Main caps, bolts, washers, and a drill bushing are included in each kit. In addition to engines listed, main cap kits are available on a special order basis for many Chrysler, Oldsmobile, and Pontiac engines.
Part No.
Description
Chevrolet
PQX0935000
350 Small Block Chevrolet
PQX0940000
400 Small Block Chevrolet
Part No.
Description
Caps
Block
Register
Chevrolet Small Block 327-400
PGESB350F
327-350 Front Cap, Large Journal
2-Bolt
2 and 4-Bolt
Stock Step
PGESB400F
400 Front Cap
2-Bolt
2 and 4-Bolt
Stock Step
PGESB350CFS4
350 Center Caps, OEM Rep.
4-Bolt
4-Bolt
Stock Step
PGESP350C15S
350 Splayed Center Caps
4-Bolt
2-Bolt
Stock Step
PGESB350CFA
350 Splayed Center Caps
4-Bolt
2 and 4-Bolt
Flat
PGESB350CSA2
350 Splayed Center Caps
4-Bolt
2-Bolt
Stock Step
PGESB350CSA4
350 Splayed Center Caps
4-Bolt
4-Bolt
Stock Step
PGESB400CFA
400 Splayed Center Caps
4-Bolt
2-Bolt
Flat
PGESP400CSR
400 Center Caps Sportsman
4-Bolt
4-Bolt
Stock Step
PGESB400CSA
400 Splayed Center Caps
4-Bolt
2-Bolt
Stock Step
PGESB350RWS
350 Rear Main Cap, Wet Sump
2-Bolt
2 and 4-Bolt
Stock Step
PGESB350RWSL
350 Rear Main Cap, Wet Sump, 1-Pc.
2-Bolt
2 and 4-Bolt
Stock
PGESB400RWS
400 Rear Main Cap, Wet Sump
2-Bolt
2 and 4-Bolt
Stock Step
Part No.
Application
Caps
Block
Register
MIL11050
283-327 Small Block Chevrolet
4-Bolt
2 or 4-Bolt
—
MIL11150
350 Small Block Chevrolet
4-Bolt
2-Bolt only
Narrow
MIL11160
350 Small Block Chevrolet
4-Bolt
4-Bolt only
4.450" Wide
MIL11180
400 Small Block Chevrolet
4-Bolt
2 or 4-Bolt
4.450" Wide
Dart Main Caps
Dart’s steel and ductile iron main caps are designed for maximum strength, stability, and balance.
Howards Main Caps
MIL11050
Part No.
Application
Caps
Block
Register
DRT32731030H
SBC Steel “Little M” 350 Mains, Interior Cap, Ea.
4-Bolt
4-Bolt
Standard
DRT32751030H
SBC Ductile Iron “Little M” 350 Mains, Interior Cap, Ea.
4-Bolt
4-Bolt
Standard
Billet main caps are CNC-machined from low-carbon 1020 material. They come available as stock replacements (straight bolt) or with splayed outer bolt holes. Splayed caps feature 10° angled outer holes to positively reinforce and tie the block together.
HRCH350F
Part No.
Application
Caps
Block
Register
HRCH350F
SBC Front Main Cap
2-Bolt
2 or 4-Bolt
Stock
HRCH350FS
SBC Front Main Cap Support Strap
—
—
—
HRCH350RSWS
SBC 350 Rear Main Cap Support Strap
—
—
—
HRCH350RWS
SBC 350 Rear Main Cap - Wet Sump
2-Bolt
2 or 4-Bolt
Stock
HRCH350R
SBC 350 Center Main Caps
4-Bolt
4-Bolt
Stock
HRCH350S
SBC 350 Splayed Center Caps
4-Bolt
2-Bolt
Stock
28 2021-22 ENGINE BUILDER CATALOG
CHEVROLET SMALL BLOCK