Dart 31161211 Special High Performance Chevy Block, 4.125 Inch Bore

Dart's Special High Performance (SHP) small-block meets the need for an affordable, precision-machined cast-iron block with superior features. Designed for high-performance and heavy-duty applications producing up to 600 horsepower, the SHP block is the ideal starting point for hot rodders, drag racers, circle track competitors, off-roaders, and high-performance marine enthusiasts. The SHP block as all the features needed without spending the big bucks and having to wait on your machine shop.

• All new, precision machined
• Cast from high nickel iron
• Priority main oiling system
• Siamese 4.125" bores
• At 4.165" bore, .230" wall thickness
• Clearance for 3.75" stroke w/ steel rods
• Decks parallel within .002"
• Made in USA
• Blind head bolt holes
• 350 main journals
• Splayed 4-bolt center main caps
• Two piece rear main seal
• Accepts OEM roller rockers and cams
• Uses 1981-85 oil pans & dipsticks
• Accepts standard starters and bellhousings

Dart SHP Block Instructions (PDF)