Volvo Penta Mounting Kit for GM 305/350 CID Engines – Fits AQ & BB Models (Replaces HOT20935-MK, 20935-MK)
Volvo Penta Mounting Kit for GM 305/350 CID Engines – Fits AQ & BB Models (Replaces HOT20935-MK, 20935-MK) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Volvo Penta Mounting Kit for GM 305/350 CID Engines – Fits AQ &...
Product Details
This Volvo Penta Mounting Kit for GM 305/350 CID Engines is engineered to secure the exhaust elbow to the manifold on Volvo Penta AQ & BB series sterndrives. It is designed for models equipped with GM 305/350 CID (5.0L/5.7L) V8 gasoline engines manufactured between 1973 and 1993.
This kit serves as a direct interchange for Volvo Penta part number 20935-MK and aftermarket reference HOT20935-MK.
- Features a straightforward bolt-on installation.
- Made from durable steel and metal for long-lasting service in marine environments.
- Provides the essential hardware for a secure, leak-free connection.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 20935-MK |
| Aftermarket | HOT20935-MK |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is compatible with the following Volvo Penta engine models:
| Brand | Model | Years | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Volvo Penta | AQ200C | 1977–1986 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | AQ200D | 1977–1986 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | AQ200F | 1985–1986 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | AQ211A | 1986–1989 | 4- Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | AQ225C/D | 1977–1986 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | AQ225E/F | 1985–1986 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | AQ231A/B | 1986–1989 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | AQ255A/B | 1978 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | AQ260A/B | 1979–1986 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | AQ271A/B/C/D | 1986–1989 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | AQ280A | 1978–1979 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | AQ290A | 1979–1985 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | AQ311A/B | 1986–1989 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | BB225A/B/C | 1973–1977 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | BB231A | 1987 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | BB260A/B/C | 1978–1987 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | BB261A | 1988–1989 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | 500A/B | 1989–1993 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | 501A/B | 1989–1993 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | 570A | 1989–1993 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | 571A | 1989–1992 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
| Volvo Penta | 572A | 1991–1993 | 4-Stroke | 20935-MK | For GM V8 305/350 CID engines |
Technical Specs
- Product Type
- Exhaust Elbow Mounting Kit
- Application
- For securing exhaust elbow to manifold on GM V8 305/350 CID engines
- Installation
- Bolt-on
- Fuel Type
- Gasoline
- Material
- Steel/Metal
- Product Dimensions
- 19.0 × 15.0 × 3.5 cm (7.5 × 5.9 × 1.4 in)
- Product Weight
- 0.26 kg (0.57 lb)
What’s in the Box
- 1 × Volvo Penta Mounting Kit (HOT20935-MK)
Installation Notes
- Ensure the engine is completely cool before beginning installation.
- Disconnect the battery to prevent any accidental starts.
- Drain any remaining water from the exhaust system.
- Carefully remove the old mounting hardware and exhaust elbow.
- Thoroughly clean the mating surfaces on the manifold and elbow to remove any old gasket material or corrosion.
- Position the new hardware (and a new gasket, sold separately) for installation.
- Attach the exhaust elbow and tighten the mounting bolts to the manufacturer's specified torque.
- Reconnect any hoses or sensors that were detached.
- Reconnect the battery, start the engine, and carefully check for any exhaust or water leaks.
Troubleshooting & FAQ
Will this kit fit my engine?
This kit is designed for Volvo Penta AQ and BB series engines using the GM 305/350 V8 block from 1973–1993. Please cross-reference your engine model and part number with the compatibility lists on this page to ensure a perfect match.
What are the signs my current mounting kit is failing?
Common symptoms include visible rust or corrosion on the bolts, water leaks around the joint between the manifold and elbow, or the sound of an exhaust leak (a hissing or ticking noise). Failure to replace worn hardware can lead to significant engine damage.
Is a gasket included with this kit?
This package contains the mounting hardware (bolts/studs) only. Gaskets are sold separately. Please ensure you have the correct gasket for your specific application before installation.
OEM vs. Aftermarket? What's the difference?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
