Cometic Nissan SR20DE/DET S14 87.5mm Bore .051in MLS Head Gasket w/Both Additional Oil Holes

Cometic MLS Head Gasket — Nissan SR20DET RWD, 87.5mm Bore, .051" (C4576-051)

An 87.5mm oversize multi-layer steel gasket for the SR20 — the one you need when the block has been bored past standard.

MLS provides maximum sealing performance and requires no sealants. Multiple layers of stainless steel give increased strength plus the ability to rebound and resist corrosion — that rebound is what keeps the seal alive through heat cycles instead of crushing once and staying crushed.

The outer layers are embossed and coated both sides with Viton, a fluoroelastomer rubber heat resistant to 250°C / 482°F, designed for harsh sealing environments, load conditions, and surface finishes. The center shim layer is uncoated stainless, and its thickness sets the compressed height.

No re-torque needed — the embossing design promotes an even clamp load across the sealing surface, which measurably reduces bore distortion.

Ideal for aluminum heads to aluminum blocks and aluminum heads to cast iron blocks, withstanding the shearing force created between two materials with different expansion rates.

Specs: 87.5mm bore, .051" (1.3mm) compressed thickness. RWD configuration.

Fitment: Nissan SR20DET RWD — S13, S14, S15 240SX and Silvia. Oversize bore — this is for a block that's been machined past standard.

Measure your actual bore before ordering. An 87.5mm gasket on an 86.5mm bore leaves the fire ring hanging into the cylinder, and that's a failure on the first heat cycle.

Head studs are effectively required. An MLS gasket on stock head bolts under real boost is how people end up doing this job twice.