S-10 4.3 V6 Replacement Mounts for 1988–2004 S-10 Trucks & Blazers Mounts - V8 Swaps by JTR Stealth

S-10 4.3 V6 Replacement Mounts for 1988–2004 S-10 Trucks & Blazers


JTR Stealth

  • $95.00

Why You Might Need These. The stock S10 4.3 V6 engine mounts use large, soft rubber isolators to reduce engine vibrations that go into the cab of the S10 trucks. The soft rubber isolators are not well suited for performance applications because they allow too much engine movement, which can lead to problems with headers contacting the frame and the steering shaft, as well as axle hop problems.

Because the stock 4.3 V6 mounts are made from rubber bonded to steel, the mounts often fail, with the rubber tearing away from the steel, allowing the engine to contact the hood. The fan can also contact the fan shroud, damaging the fan and shroud.

Stealth Conversion's high-performance 4.3 V6 mount assembly uses a Chevrolet 2.8 V6 S-10 replacement mount (part # S10-106) and the JTR 2.8 to 4.3 V6 conversion mount (part # S10-109).

The mount-assembly is stiffer than the stock S10 4.3 V6 mounts but is soft enough to be used on street driven vehicles without transmitting excessive noise and vibration into the truck. The 2.8 V6 replacement mount has the rubber surrounded by steel. This mount is the most common mount to use in the S-10 V8 swap -- it has proven itself to be strong enough for even the most powerful V8’s, yet compliant enough to prevent noise and vibration from entering the cab.

High-performance replacement mount kit, S10, Stealth ConversionsThis kit will bolt directly into most S-10 trucks and Blazers with the 4.3 V6, using the original mounting holes on the S-10 frame, and on the 4.3 V6 engine. 

Note: This kit will not work on ZR2 trucks.

Comparison of Corvette motor mount to 2.8 V6 mount

Corvette motor mount comparison, Stealth Conversions

The 2.8 V6 mount is very similar to the mount used in the 1984-1991 Corvette. They both use rubber isolators surrounded by a steel shell. The Corvette mount will not bolt to the S-10 frame because the mounting holes are slightly different.

The 2.8 V6 style rubber isolator is also used in stock 4.3 V6 Astro Vans. The reason we mention this is because these mounts are designed for the 4.3 V6 and are soft enough to keep the 4.3 V6 S-10 smooth and quiet in the S-10 application.

Recently, the prices at Chevrolet have gone up quite a bit for 2.8 V6 rubber isolators, which now retail for over $110 each. That’s $220/pair, which is more than most people are willing to spend.

The aftermarket 2.8 V6 rubber isolators can normally be purchased at auto parts stores for about $30/pair. They are good quality although slightly stiffer than the stock Chevrolet 2.8 V6 mounts. The aftermarket 2.8 V6 rubber isolators are similar in stiffness to the Corvette rubber isolator.

Polyurethane Mounts
If you want to use polyurethane mounts, you can use the polyurethane inserts for the Chevrolet brand 2.8 V6 mounts (part # S10-107). However, these will not fit into the aftermarket 2.8 V6 steel shell (shown on the right) -- they will only fit in the Chevrolet 2.8 V6 steel shell (center).

The lowest cost way to use polyurethane mounts is to purchase the 2.8 to 4.3 V6 adapter mounts (S10-109), the polyurethane inserts (S10-107), and get the Chevrolet 2.8 V6 style of mount from a wrecking yard. The 2.8 V6 style of mount came on the following vehicles:1985-2005 Astro Vans with the 4.3 V6, 1982-1993 S-10's with the 2.8 V6, and the 1982-1992 Camaro's with the 2.8 V6 and 3.1 V6.

As a word of caution, the polyurethane mounts are very stiff, and transmit a noticeable amount of vibration into the truck. We do not recommend the polyurethane inserts on 4.3 V6 trucks and Blazers that are used as commuter vehicles.

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