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Marine

68mm Mercruiser Throttle Body

TPIS Dual Bore 68MM Throttle Body for Mercruiser Mag 454 & 502 Engines - Have you upgraded y...

TPIS Dual Bore 68MM Throttle Body for Mercruiser Mag 454 & 502 Engines - Have you upgraded your stock Mercruiser Big Block Chevy to a 540 or larger engine?  Increasing the bore size from 60mm to 68MM, this throttle body will let your big displacement engine breathe.  We fully dis-assemble each throttle body, CNC machine the bores, machine the throttle shafts for better air flow, and install new CNC machines throttle blades.  These are available on an exchange basis or we can modify your ...

$279.95

Aqua-Lung Throttle Body

TPIS Aqua-Lung Throttle Body for Mercury Racing HP525 Engines - Is your stock HP525 throttle body...

TPIS Aqua-Lung Throttle Body for Mercury Racing HP525 Engines - Is your stock HP525 throttle body holding you back?  Your big cube Big Block needs one of these! An industry first, these units are designed for engines making over 620 HP, this throttle body has a massive 5" inch X 3.25" inch opening.  Bolts onto HP525 intake manifolds, and features an integral flange for mounting a flame arrestor or air filter of your choice.  * We can modify your HP500 or early HP525 to accept this throttle bo...

$574.95

Marine Throttle Body

TPIS Mono Blade TB For Mercury Racing HP Series Engines - This Monoblade throttle body is a no-br...

TPIS Mono Blade TB For Mercury Racing HP Series Engines - This Monoblade throttle body is a no-brainer upgrade from your stock HP twin bore 58MM throttle body.  Perfect for use when upgrading your 502 c.i. to a 540 c.i. or larger engine.  Accepts Factory TPS and IAC Motor.

$479.95

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