Goopool LS Swap Motor Mounts for 1973–1998 Square Body & OBS Trucks — Adjustable Cold‑Rolled Steel Brackets

Goopool LS Swap Motor Mounts are adjustable steel brackets that let you install Chevrolet LS and Vortec engines into 1973–1998 Square Body and OBS C/K trucks with reliable alignment for a variety of automatic transmissions.

These motor mounts were engineered to adapt modern LS-family and compatible Vortec engines to classic Chevy and GMC full‑size trucks—covering both the 1973–1987 "Square Body" models and the 1988–1998 OBS C/K series. The brackets are made from high‑carbon cold‑rolled steel, include slotted adjustment for engine positioning, and accept common transmission pairings so you can use factory and aftermarket driveline combinations.

Which engines and trucks will these mounts fit?

These mounts are designed for virtually all Chevrolet LS engines and many Vortec truck engines from late‑1990s to early‑2010s, plus the original small‑block clamshell setups used in older trucks. They cover LS1 through LS9 and a broad list of GM truck V8s, and they are compatible with both 2WD and 4WD full‑size Chevy/GMC models from 1973 to 1998.

• All LS family engines: LS1, LS2, LS3, LS6, LS7, LS9 and other listed LS variants.
• Vortec truck engines: 4.8L, 5.3L, 6.0L, 6.2L (1999–2013 variants listed).
• Fits classic trucks: Square Body (1973–1987) and OBS C/K (1988–1998) including C10, K20, Suburban, Blazer, Sierra, Silverado.
• Also accommodates vehicles originally using SBC clamshell mounts (305, 350, 400 and 5.0L/5.7L variants).

How do these brackets handle engine placement and transmission compatibility?

The mounts include slotted adjustment points so you can fine‑tune engine fore/aft and lateral position to clear steering, crossmembers, and accessory drive components. They are built to accept a wide range of transmissions, making it easier to match with stock or popular aftermarket gearboxes.

• Slotted mount holes for incremental engine positioning and alignment.
• Designed to pair with 4L60E, 4L65E, TH350, TH400, TH700R4, 4L80 and similar automatics.
• Allows clearance adjustments for accessories, exhaust, and steering linkage.

What materials and construction quality should I expect?

Goopool mounts are fabricated from cold‑rolled high‑carbon steel for strength and consistent dimensional accuracy. The robust construction reduces flex and helps keep engine and transmission alignment stable under load while simplifying installation for experienced DIYers and professional shops.

• Cold‑rolled high‑carbon steel for improved rigidity and repeatable fitment.
• Precision accessory hole locations to match vehicle and engine interfaces.
• Durable finish ready for underhood exposure and aftermarket coating if desired.

What should I know before buying and installing these mounts?

Verify your engine block type and original mount style to ensure compatibility with these brackets, and confirm transmission clearances and crossmember position for your chassis. Basic welding or bolt‑on skills are useful during installation; consult a professional if you’re unsure about mount placement or driveline angles.

• Confirm engine model (LS or specified Vortec codes) and truck year/type before purchase.
• Check transmission tunnel, crossmember, and driveshaft length for fitment needs.
• Professional alignment or installation recommended if unfamiliar with engine swaps.

Who is this for: These Goopool LS Swap Motor Mounts suit builders updating classic Chevy and GMC full‑size trucks to modern GM powerplants—hot rodders, restorers, and custom shops seeking a strong, adjustable mounting solution that supports common automatic transmissions and broad engine compatibility without fabricating mounts from scratch.