Fel-Pro OS34407R PermaDry One-Piece Oil Pan Gasket – Big Block Chevy 454 Gen V & Gen VI (1991–2000)

What it is

A one-piece molded rubber pan gasket for the later 454 with built-in torque limiters, so the pan bolts stop at the right compression and the gasket cannot squeeze out or split. One piece means no corner seams to leak, which is the usual failure of four-piece cork sets on these engines.

Fits

Gen V (1991–1995) and Gen VI (1996–2000) 7.4L big blocks in C/K 2500/3500 trucks, Suburbans, G-vans and P-chassis motorhomes. The earlier Mark IV 454 has a different pan rail and uses a different Fel-Pro set.

What's in the box

One gasket.

Installation

Clean both rails, set the gasket dry (a dab of RTV only at the timing-cover and rear-seal corners per Fel-Pro), torque bolts to spec in sequence; the limiters prevent over-tightening. Reusable at the next pan drop.

Why Fel-Pro

PermaDry one-piece gaskets are what the dealer uses on these engines; the limiters make a dry, repeatable seal possible for a DIY owner lying under a truck.

Chevrolet/GMC 7.4L 454 Gen V and Gen VI big block, 1991–2000 trucks, vans and motorhome chassis, with the one-piece rear main seal. Not for Mark IV (1965–1990) blocks.

Fitment data from the manufacturer catalogue. Check your engine before ordering, or call us.

Shipping. Free on every order, US only. Orders arrive in 2–4 days.

Returns. 30-day returns, except in extreme cases.

Support. Our team is available 24/7 for fitment mismatches or any other reason.

Warranty. Full manufacturer guarantee.