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#9151250
Forged SB Chevy Rotating Assembly, 383 Flat Top, H-Beam, 5.7 Rods
- Kit includes crankshaft, forged pistons, H-beam connecting rods, and main & rod bearings
- Forged 4340 Steel crankshaft and connecting rod
- Forged aluminum pistons
$2,105.99
/each
On Backorder
This part is Backordered. We currently do not have an estimate when this item will ship.
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Product Summary
350 mains Main Journal Style, 3.750" Engine Stroke
- Kit includes crankshaft, forged pistons, H-beam connecting rods, and main & rod bearings
- Forged 4340 Steel crankshaft and connecting rod
- Forged aluminum pistons
- 5.7" rod length
- 4" piston diameter
Comes as a Kit
View Kit Components
Key Specs
| MFG. Part # | 9151250 |
| Brand | Speedway Motors |
| Connecting Rod Type | H-Beam |
| Piston Style | Flat Top |
| Piston Material | Forged Aluminum |
Need To Know
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Return PolicySpeedway Motors 9151250 Details
Speedway Motors 9151250 Details
Speedway introduces forged rotating assemblies, with an optional balance job. Includes new 2-pc rear main seal crank, rods and pistons. Cranks are new so they use standard size bearings.
All Scat 4340 cranks are 2-piece rear main seal, internally balanced and weigh approximately 51-55 lbs. All balancing is done with our state-of-the-art Hines balancer by race mechanics with over 30 years of experience! A kit purchased with the optional balance job will ship in 24-48 hours. These rotating assembly engine rebuild kits may require additional charges for heavy metal.
If you are going to run this crank in a sprint car motor, you must have the crank flange turned down prior to balancing the crank to allow it to go through the motor plate.
Chevy 383: 4.000" bore x 3.75" stroke
NOTE: Piston rings are not included and must be purchased separately. Use Style C rings.
Item Details
Flat top, 476 g.
Features internally balanced 383 crankshaft - use balance option # 915-10200
C/R 58cc=12.0, 64cc=11.1, 76cc=9.8
Piston/Pin Weight: 609 g
Rod Length: 5.7"
Kits feature:
- Scat 4340 Forged Steel Crankshaft
- Standard size journals
- Straight shot and chamfered oil holes
- Nitride hardened and shot peened
- Lightening holes in all rod throws
- Large radius on all journals
- KB Signature Series Forged Pistons
- 2618 aluminum alloy construction
- T-6 heat treated
- 4.000" bore pistons available in standard, .030, .040, or .060 sizes
- Speedway 4340 H-beam Connecting Rods
- Full floating pin in silicon bronze bushing
- Precision bolt bushings to positively locate cap
- 5.7" lengths
- 622 grams
- Weight matched set of 8 rods
- King HP Series Main and Rod Bearings
- 0.015" thick top layer for superior macro particle embedability and conformability
- 40 Vickers hardness to resist overlay migration and extrusion
- 450°F heat threshold for superior protection against friction and overheating
- Mains are 3/4 grooved for improved oiling to the rod journals
- Bi-metal aluminum silicon alloy featuring fine micro-bore finish
Kits feature:
- Scat 4340 Forged Steel Crankshaft
- Standard size journals
- Straight shot and chamfered oil holes
- Nitride hardened and shot peened
- Lightening holes in all rod throws
- Large radius on all journals
- KB Signature Series Forged Pistons
- 2618 aluminum alloy construction
- T-6 heat treated
- 4.000" bore pistons available in standard, .030, .040, or .060 sizes
- Speedway 4340 H-beam Connecting Rods
- Full floating pin in silicon bronze bushing
- Precision bolt bushings to positively locate cap
- 5.7" lengths
- 622 grams
- Weight matched set of 8 rods
- King HP Series Main and Rod Bearings
- 0.015" thick top layer for superior macro particle embedability and conformability
- 40 Vickers hardness to resist overlay migration and extrusion
- 450°F heat threshold for superior protection against friction and overheating
- Mains are 3/4 grooved for improved oiling to the rod journals
- Bi-metal aluminum silicon alloy featuring fine micro-bore finish
Speedway Motors 9151250 Specifications
Speedway Motors 9151250 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 9151250 |
| Brand | Speedway Motors |
| Connecting Rod Type | H-Beam |
| Piston Style | Flat Top |
| Piston Material | Forged Aluminum |
| GENERAL | |
| Main Journal Style | 350 mains |
| Engine Stroke | 3.750" |
| Connecting Rod Length | 5.700" |
| Connecting Rod Material | Forged 4340 Steel |
| Connecting Rod Weight | 622 grams |
| Connecting Rod Bolt Diameter | 7/16" |
| Piston Diameter | 4" |
| Piston Weight | 476 grams |
| Piston Ring Style | C |
| Crankshaft Material | Forged 4340 Steel |
| Rear Main Seal Style | 2-piece |
| Wrist Pin Diameter | .9272" |
| Wrist Pin Weight | 133 grams |
| Main Journal Diameter | 2.448" |
| Rod Journal Diameter | 2.10" |
| Bearing Construction | Bi-metal |
| Bearing Undersize | Standard |
| Narrowed Bearing | Yes |
| Coated Bearing | No |
| Engine Balance | Internal |
| Notes | Torque rod bolts to 63 ft./lbs. |
| Sold in Quantity | Kit |
Ratings & Reviews
Ratings & Reviews
Questions & Answers
Questions & Answers
5 Questions • 5 Answers
Will this fit an LT1?
by Mark
• 8 years ago
1 answer
View Answer
Do you have a forged.40 over 350 kit with a 3.75 stroke crank in the 10.5 to 11 range
by Rory
• 8 years ago
1 answer
View Answer
I would like right around say 11.8 ish to1 compression. On my 64 cc head. Do you carry about a .125 dome ? And if so am I on target for the range I'm seeking? Thank you
by Clutch
• 9 years ago
1 answer
View Answer
Does the block need clearanced for this kit?
by Gas man
• 9 years ago
1 answer
View Answer
what is the compression ratio with a 64cc head
by cj
• 10 years ago
1 answer
View Answer
5 of 5 questions shown
Fitment
Fitment
1973-1975 Chevy Bel Air
Gen 1 L48 Small Block Chevy
1972 Chevy Blazer
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
1973-1974 Chevy Blazer
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
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1973-1982 Chevy C10
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Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1983 Chevy C10
2-Piece Rear Main Chevy 350
1984 Chevy C10
Gen 1 L48 Small Block Chevy
1985 Chevy C10
2-Piece Rear Main Chevy 350
1972-1982 Chevy C10 Suburban
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1983 Chevy C10 Suburban
2-Piece Rear Main Chevy 350
1984 Chevy C10 Suburban
Gen 1 L48 Small Block Chevy
1985 Chevy C10 Suburban
2-Piece Rear Main Chevy 350
1982-1987 Chevy C15
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1972-1982 Chevy C20
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1984 Chevy C20
Gen 1 L48 Small Block Chevy
1972-1982 Chevy C20 Suburban
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1984 Chevy C20 Suburban
Gen 1 L82 Small Block Chevy
1972-1982 Chevy C30
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1984 Chevy C30
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1983-1987 Chevy C35
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Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
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Gen 1 L48 Small Block Chevy
1973-1982 Chevy Caprice
Gen 1 L48 Small Block Chevy
1983 Chevy Caprice
2-Piece Rear Main Chevy 350
1984 Chevy Caprice
Gen 1 L48 Small Block Chevy
1985 Chevy Caprice
2-Piece Rear Main Chevy 350
1973 Chevy Chevelle
Gen 1 L48 Small Block Chevy
1973-1974 Chevy Corvette
Gen 1 L48 Small Block Chevy
1980 Chevy Corvette
Gen 1 L48 Small Block Chevy
1984 Chevy Corvette
Gen 1 L83 Small Block Chevy
1985 Chevy Corvette
2-Piece Rear Main Chevy 350
1973-1977 Chevy El Camino
Gen 1 L48 Small Block Chevy
1978-1979 Chevy El Camino
2-Piece Rear Main Chevy 350
1983 Chevy El Camino
2-Piece Rear Main Chevy 350
1984 Chevy El Camino
Gen 1 L81 Small Block Chevy
1975-1982 Chevy G10
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1984 Chevy G10
Gen 1 L82 Small Block Chevy
1970 Chevy G10 Van
2-Piece Rear Main Chevy 350
1972-1974 Chevy G10 Van
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1975-1982 Chevy G20
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L82 Small Block Chevy
1972 Chevy G20 Van
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1973-1974 Chevy G20 Van
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L82 Small Block Chevy
1975-1982 Chevy G30
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
1970 Chevy G30 Van
2-Piece Rear Main Chevy 350
1972-1974 Chevy G30 Van
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
1973-1982 Chevy Impala
Gen 1 L48 Small Block Chevy
1983 Chevy Impala
2-Piece Rear Main Chevy 350
1985 Chevy Impala
2-Piece Rear Main Chevy 350
1972-1982 Chevy K10
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1972-1982 Chevy K10 Suburban
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1972-1982 Chevy K20
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1972-1982 Chevy K20 Suburban
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1972-1974 Chevy K30
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1977-1982 Chevy K30
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1970-1974 Chevy K5 Blazer
2-Piece Rear Main Chevy 350
1975-1982 Chevy K5 Blazer
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1983 Chevy K5 Blazer
2-Piece Rear Main Chevy 350
1984 Chevy K5 Blazer
Gen 1 L48 Small Block Chevy
1985 Chevy K5 Blazer
2-Piece Rear Main Chevy 350
1973-1975 Chevy Laguna
Gen 1 L48 Small Block Chevy
1976 Chevy Laguna
2-Piece Rear Main Chevy 350
1973-1982 Chevy Malibu
Gen 1 L48 Small Block Chevy
1970-1971 Chevy Monte Carlo
2-Piece Rear Main Chevy 350
1973-1975 Chevy Monte Carlo
2-Piece Rear Main Chevy 350
1976-1977 Chevy Monte Carlo
Gen 1 L48 Small Block Chevy
1982-1983 Chevy Monte Carlo
2-Piece Rear Main Chevy 350
1975 Chevy Monza
Gen 1 L48 Small Block Chevy
1973-1974 Chevy Nova
Gen 1 L48 Small Block Chevy
1975 Chevy Nova
2-Piece Rear Main Chevy 350
1976-1979 Chevy Nova
Gen 1 L48 Small Block Chevy
1975-1979 Chevy P30
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
1980-1983 Chevy P30
2-Piece Rear Main Chevy 350
1985 Chevy P30
2-Piece Rear Main Chevy 350
1970 Chevy P30 Van
2-Piece Rear Main Chevy 350
1972 Chevy P30 Van
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
1973-1974 Chevy P30 Van
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
1967 GMC C15/C1500 Suburban
2-Piece Rear Main Chevy 350
1980-1984 GMC C1500
2-Piece Rear Main Chevy 350
1980-1986 GMC C1500 Suburban
2-Piece Rear Main Chevy 350
1967-1972 GMC C25/C2500 Pickup
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1967-1972 GMC C25/C2500 Suburban
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1967-1974 GMC C35/C3500 Pickup
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Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
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2-Piece Rear Main Chevy 350
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2-Piece Rear Main Chevy 350
1967-1974 GMC G15/G1500 Van
2-Piece Rear Main Chevy 350
1979-1986 GMC G1500
2-Piece Rear Main Chevy 350
1975-1978 GMC G25
2-Piece Rear Main Chevy 350
1967-1974 GMC G25/G2500 Van
2-Piece Rear Main Chevy 350
1979-1986 GMC G2500
2-Piece Rear Main Chevy 350
1975-1978 GMC G35
2-Piece Rear Main Chevy 350
1967 GMC G35/G3500 Van
2-Piece Rear Main Chevy 350
1970-1974 GMC G35/G3500 Van
2-Piece Rear Main Chevy 350
1979-1986 GMC G3500
2-Piece Rear Main Chevy 350
1974-1977 GMC Jimmy
2-Piece Rear Main Chevy 350
1983-1984 GMC Jimmy
2-Piece Rear Main Chevy 350
1975-1978 GMC K15
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1975-1978 GMC K15 Suburban
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1967-1974 GMC K15/K1500 Pickup
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1967-1974 GMC K15/K1500 Suburban
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1979-1984 GMC K1500
2-Piece Rear Main Chevy 350
1979-1980 GMC K1500 Suburban
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1975-1978 GMC K25
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1975-1978 GMC K25 Suburban
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1967-1974 GMC K25/K2500 Pickup
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1967-1974 GMC K25/K2500 Suburban
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1979-1984 GMC K2500
2-Piece Rear Main Chevy 350
1979-1986 GMC K2500 Suburban
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1994-1999 GMC K2500 Suburban
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1967-1974 GMC K35/K3500 Pickup
Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy
1973-1977 GMC Sprint
Gen 1 LM1 Small Block Chevy
1967 GMC Suburban
Gen 1 L46 Small Block Chevy
1987-1991 GMC V1500 Suburban
350 Chevy Small Block V8
1987 GMC V2500
350 Chevy Small Block V8
1987-1991 GMC V2500 Suburban
350 Chevy Small Block V8
1987-1991 GMC V3500
350 Chevy Small Block V8