Mercury Racing 525 replacement style heads. Three intake runner sizes offer potential for increased levels of performance. We’ve retooled Dart’s PRO1 BBC castings to produce a true bolt on upgrade for the Mercury Racing 525 engine. The PRO1 24° 525 MMR is available with 310cc, 325cc or 345cc intake runners and has the correct exhaust bolt pattern for the factory manifolds. A grey chromate surface treatment inhibits salt corrosion for marine usage.

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AFR Intake Manifold Gasket, BBC s .120 thick for 345cc, 357cc, 377cc & 385cc

AFR Intake Manifold Gasket, BBC s .120 thick for 345cc, 357cc, 377cc & 385cc

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