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#9151272
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400 mains Main Journal Style, 3.875" Engine Stroke
| MFG. Part # | Select Oversize |
| Cylinder Bore Size | Select Oversize |
| Connecting Rod Type | H-Beam |
| Piston Style | Flat Top |
| Piston Material | Forged Aluminum |
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855.313.9176Quick and Easy Returns
Return PolicySpeedway 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 (must be purchased separately, part # 91510201). 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.
NOTE: Piston rings are not included and must be purchased separately. Use Style E rings.
50 cc 14.0:1 compression ratio
Kits feature:
Kits feature:
Application
| KEY SPECS | |
|---|---|
| MFG. Part # | Select Oversize to see |
| Brand | Speedway Motors |
| Cylinder Bore Size | Select Oversize to see |
| Connecting Rod Type | H-Beam |
| Piston Style | Flat Top |
| Piston Material | Forged Aluminum |
| GENERAL | |
| Main Journal Style | 400 mains |
| Engine Stroke | 3.875" |
| Connecting Rod Length | 6.000" |
| Connecting Rod Material | Forged 4340 Steel |
| Connecting Rod Weight | 634 grams |
| Connecting Rod Bolt Diameter | 7/16" |
| Piston Diameter | Select Oversize to see |
| Piston Weight | 427 grams |
| Piston Ring Style | E |
| Crankshaft Material | Forged 4340 Steel |
| Rear Main Seal Style | 2-piece |
| Wrist Pin Diameter | 0.9272" |
| Main Journal Diameter | 2.650" |
| Rod Journal Diameter | 2.10" |
| Bearing Construction | Bi-metal |
| Bearing Undersize | Standard |
| Narrowed Bearing | Yes |
| Coated Bearing | No |
| Sold in Quantity | Kit |
5
4 Reviews
Customers are consistently satisfied with the product's exceptional quality and outstanding performance. With its high-quality materials, it has proven to be highly practical and robust, achieving 520 HP on Premium with AFR 220 heads. The product's usability and reliability are also praised, having been tested in numerous drag races with 200 shots of nitrous without any issues. Users have also noted the product's excellent value for the price, given its decent quality parts, with many making repeat purchases. Customers strongly recommend this product over competitors due to these proven superior capabilities.
5
4 reviews
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Yes great item
5.0
a year ago
Bmase 757
Va
Verified
Plenty of torque
Would Recommend
I would buy again
5.0
5 years ago
Magnum matt
Hickory pa
Verified
Great product
Would Recommend
second time I have purchased this item
5.0
8 years ago
55 / 57 Wheelman
Riverton Wy
Verified
With 76 cc AFR 220 heads and a Hyd roller cam this motor makes 520 HP on Premium I have drag raced this engine a lot with a 200 shot of nitrous no problems yet just wanted an identical spare
Would Recommend
excellent value for the price
5.0
9 years ago
rocket
wash st
Verified
most parts were decent quality
Would Recommend
Showing 4 of 4 reviews
6 Questions • 6 Answers
Is there a certain power that his rotating assembly is rated for? Also is it nitrous friendly if the rings are gapped accordingly?
by Cohen
• 3 years ago
1 answer
View Answer
What is the part# for the piston rings i need
by Nick
• 3 years ago
1 answer
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what is the compression ratio with a 64cc head on this kit?
by cj
• 10 years ago
1 answer
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Does this kit include the wrist pins?
by Bill
• 11 years ago
1 answer
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what additional machine work must be beyond balancing for internal clearances? I have a good 400 block (2 pc rear main) at 4.155 bore and want to know what additional machine work must be done to clear the cam / piston skirts, etc. Thanks
by scott32
• 11 years ago
1 answer
View Answer
the compression ratio listed is 10.7 what cc of head is that with?
by pro23
• 13 years ago
1 answer
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6 of 6 questions shown
