Plenum Gasket Set, standard 1/32" thickness.  Fits 90~95 ZR-1 LT5. Sold by the set which contains 2 individual gaskets as shown.

• Same thickness as the original GM gasket.
• Direct replacement on stock, un-modified engines. oversized gasket port size does not affect function or engine operating characteristics.
• Port size increased to 37.5mm for modified, ported intake. For siamesed porting, simply cut out the center bifurcation.
• Coolant flow for throttle body heat can be enabled or blocked by simply orienting the gasket as desired.
• Gaskets are die cut to exact dimensions taken from GM LT5 engine drawings. Port alignment may vary slightly due to core shift when parts were cast.

These die-cut precision gaskets, are made exclusively for Jerry's Gaskets, utilizing original engine drawings for dimensions. Made from Pro-Formance/MicroPore, non-asbestos gasket material with a fully cured nitrile butadiene rubber binder, 12~20% compressibility for excellent sealability and a max temp rating of 550F.

See part #571 in the diagram.