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.

More From This Category

Trick Flow Head Combo, GenX Top-End, 485 hp/460 ft.-lbs. Torque, For Chevrolet, Small Block, LS1, Kit

Trick Flow Head Combo, GenX Top-End, 485 hp/460 ft.-lbs. Torque, For Chevrolet, Small Block, LS1, Kit

$9,219.10