• Application-Specific Fitment – Designed for adapting Flathead Ford engines to C4 transmissions using a small bellhousing and a 157-tooth starter ring., • Correct Converter Spacing – Built to match torque converter stud spacing of 10.5 inches center-to-center on the 157-tooth configuration for proper alignment., • Heavy Duty Steel Construction – Crafted from strong steel for dependable performance and long service life in street, strip, or restoration builds., • Precision Machined Dimensions – Features a 3.989-inch crank pilot I.D. and 4.526-inch O.D. mounting surface to ensure a secure and accurate fit., • Multiple Tooth Count Options – Available in both 157- and 164-tooth versions to suit small or large bellhousings; compatible with 7/16-inch Chevy flexplate bolts.
Flexplate, Flathead Ford to C-4 Ford Transmission 157 Tooth Speedway Motors
Flexplate, Flathead Ford to C-4 Ford Transmission 157 Tooth
Sku # 91628900-157
Mfr. Part # 91628900-157
Condition
New
Brand
Speedway Motors
Sold
Each
Details

916-28900-157: 157 Tooth Version.

  • This starter ring is used with small bellhousing.
  • The torque converter stds should measure 10 1/2" center to center.

916-28900-164: 164 Tooth Version.

  • This starter ring is used with big bellhousing.
  • The torque converter stds should measure 11 1/2" center to center.

Use 7/16" Chevy flexplate bolts Specs

MFG. Part #
91628900-157
Outside Diameter
13.25"
Tooth Count
157
Flange Thickness
.405"
Material Type
Steel
Sold in Quantity
Each
Notes
Crank mounts have an I.D. of 3.989" and O.D of 4.526"
Reviews

Very good quality recommended

Rated
Product Rating
by Aldo Suarez on December 04, 2025

Summary: I installed it on my ford 1953 customline with a c4 transmission and it turned out very well

Yes, I recommend this product.

Flexplate Flathead to Ford C4 Transmission

Rated
Product Rating
by JNM on April 30, 2025

Summary: Installed the replacement flex, no problems.

Yes, I recommend this product.

Flex Plate

Rated
Product Rating
by big Red on July 08, 2021

Summary: Used on a 1950 Merc C-4 tranny

Yes, I recommend this product.

Fits as described.

Rated
Product Rating
by Matt on May 29, 2020

Summary: Fits and seems good quality.

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Tech Support
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About
Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.