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For the 250-4203 Head Studs
2000 and 2400 five-speed automatic transmission
Replacement filter cartridge for 1064012
Same actuator used on Screamer turbos
2001-2004 Duramax LB7 SoCal Billet Main Caps 2003 Ford Air Intake & Accessories For the 250-4203 Head StudsOEM main caps tend to collapse in on themselves when subjected to high horsepower. As the cap collapses, the dimension across the parting line becomes smaller, eventually causing the edge of the bearing to begin scraping oil off the crankshaft, leading to bearing and crank failure. SoCal Diesel main caps solve the collpase issue by using high strength aircraft quality steel. Blanchard ground, precision machined. Recommended for engines above 800 RWHP.