The front and rear height measurements listed in the Specs section are referencing the overall height with the top plate installed. Please see the diagrams in the product images for other dimensions. 

The LS3/L92 Lo-Ram manifolds base intake manifold is designed with a low height to aid the packaging of a plenum mounted air-to-water intercooler for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm. The Holley LS3 Lo-Ram intake manifold kits are designed for GM LS Gen III and IV engines equipped with GM LS3/L92 cylinder heads. These intake manifolds will work with OE or aftermarket cylinder heads. The Lo-Ram intake manifolds are designed for forced induction (supercharged or turbocharged) engine applications and the 105 mm throttle body part number 112-581 or similar models. The base intake manifold is designed with a low height to aid the packaging of a plenum-mounted air-to-water intercooler. Additional manifold designs include both single and dual injector options. Available with both as-cast satin and black power-coat finishes. High volume fuel rails for eight and sixteen injector configurations. Mounting hardware included with 3/4-16 O-ring ports (8 AN)

• Designed for GM LS Gen III and IV engines equipped with GM LS3/L92 cylinder heads

• Provides best performance for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm, depending on the application

• Dual-injector, separate-passage, high-volume fuel rails with mounting hardware, dual-fuel capable, 8 AN o-ring ports

• Low height to aid the packaging of a plenum mounted air-to-water intercooler in a top-feed configuration

• Available with both as-cast satin and black power-coat finishes

• High volume fuel rails for eight and sixteen injector configurations. Mounting hardware included with3/4-16 O-ring ports (8 AN)and mounting hardware included with 3/4-16 O-ring ports (8 AN)