Alto DA-108 GM Big Block Marine Damper Plate | 13-1/4 in. | 26-Spline | 250–310 HP | Replaces Barr AS5-K2C
Alto DA-108 GM Big Block Marine Damper Plate | 13-1/4 in. | 26-Spline | 250–310 HP | Replaces Barr AS5-K2C
Alto
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Alto DA-108 — GM Big Block Marine Flywheel Damper Plate | 13-1/4 in. OD | 26-Spline | Replaces Barr AS5-K2C | Velvet Drive 1004650008
Alto DA-108 is a marine flywheel damper plate designed for late 5.7L GM Big Block engines producing 250 to 310 HP. It features a 13-1/4 in. outside diameter, 26-spline hub, and 8 white springs, with multiple bolt hole patterns to accommodate various applications. Important: Do not use with lower HP engines — this plate is rated for 250–310 HP applications only. Using it outside this HP range risks improper engagement and potential drivetrain damage. Confirm your engine’s HP rating and flywheel bolt pattern before ordering. Alto DA-108 replaces Barr AS5-K2C and Velvet Drive 1004650008. Alto Products Corp. is a leading manufacturer of marine flywheel damper plates and transmission components for GM, Velvet Drive, and related applications.
Confirm Fitment Before Ordering
This damper plate is specific to late 5.7L GM Big Block engines in the 250–310 HP range — confirm your engine HP rating and flywheel bolt pattern before ordering. Contact us with your engine model, serial number, and transmission model and we’ll verify correct application by email, text, or live chat.
Part Specifications
- Alto Part Number: DA-108
- OEM Cross-References: Barr AS5-K2C, Velvet Drive 1004650008
- Outside Diameter: 13-1/4 in.
- Spline Count: 26-spline
- Springs: 8 white springs
- Bolt Pattern: Multiple bolt holes for various applications
- Application: Late 5.7L GM Big Block marine engine — 250 to 310 HP only
- Warning: Do not use with lower HP engines
- Vendor: Alto Products Corp.
Additional Information
- Vendor: Alto Products Corp.
- Part Number: DA-108
- OEM Cross-References: Barr AS5-K2C, Velvet Drive 1004650008
- Outside Diameter: 13-1/4 in.
- Spline Count: 26-spline
- Springs: 8 white springs
Installation Notes
Installation should be performed by a qualified marine technician following the applicable service manual for your GM Big Block engine and transmission combination. Verify HP rating and flywheel bolt pattern compatibility before installation.
Frequently Asked Questions
Q: What does Alto DA-108 replace?
A: Alto DA-108 replaces Barr AS5-K2C and Velvet Drive 1004650008.
Q: What HP range is Alto DA-108 rated for?
A: Alto DA-108 is designed for late 5.7L GM Big Block marine engines producing 250 to 310 HP. Do not use with lower HP engines — the spring rate and engagement characteristics are specific to this HP range. Confirm your engine’s HP rating before ordering.
Q: What are the specifications of Alto DA-108?
A: Alto DA-108 features a 13-1/4 in. outside diameter, 26-spline hub, 8 white springs, and multiple bolt hole patterns to fit various GM Big Block flywheel configurations.
Q: Will Alto DA-108 fit my GM Big Block if it is not a late 5.7L?
A: Alto DA-108 is specified for the late 5.7L GM Big Block in the 250–310 HP range. If your engine is a different displacement, earlier production, or lower HP rating, contact us before ordering to confirm whether DA-108 is correct for your application or whether a different damper plate applies.
Q: What transmission does Alto DA-108 work with?
A: Alto DA-108 interfaces with Velvet Drive marine transmissions on late 5.7L GM Big Block applications. It replaces Velvet Drive 1004650008. Contact us with your full engine and transmission model information to confirm compatibility before ordering.
! Compatibility references are provided for informational purposes only and do not constitute a fitment guarantee. Part numbers, application listings, and "replaces" cross-references are based on manufacturer data and are intended as a starting point for identification — not a guarantee of fit for your specific engine, hull, or installation.
Buyer is solely responsible for verifying compatibility with their engine model, serial number, model year, and trim configuration before purchase. If you are unsure whether this part fits your application, contact MacombMarineParts.com before you buy — we're available via text, email, or online chat to help verify compatibility for your specific application.
MacombMarineParts.com is not liable for parts ordered based on assumed fitment. Returns due to buyer-selected incorrect fitment are subject to our standard return and restocking fee policies.