RHS Bare Block Engine 4.120" Bore 9.250 Deck Standard Main - 6-Bolt Mains AA0220BG2T64 and reliability

and reliability

Rollin' Thunder camshafts feature more aggressive lift profiles than possible with conventional flat-tappet hydraulic cams

Advance weight pins are staked and tig welded to the plate

GM Fullsize Truck 1971-72

RHS Bare Block Engine 4.120" Bore 9.250 Deck Standard Main - 6-Bolt Mains AA0220BG2T64 and reliabilityThis block has a 9. 240 deck height with a 4. 125 bore and a 5. 87 cylinder sleeve length. Cylinder walls are Siamese cast with press in cast iron sleeves. 12AN feeds for dry sumps. Aircraft quality A357 T6 aluminum. 6 Head Bolt Design. In recent years, LS engine technology has revolutionized the GM performance aftermarket. Gen IV engines have set a new standard for factory horsepower and torque. To meet the growing demand of today's high performance