Proflow Engine Block- SB Chev 1 Piece Rear Main Seal, 86-later 

When building a mild Small-Block performance engine, blocks from Proflow offer strength,accuracy and peace of mind that can't be assured in a rebuilt core.And, unlike so many of the used cores, nearly all of ours feature four-bolt main caps for extra strength. Each cylinder block is machined to production-spec tolerances and is manufactured to the exact specifications of post-1986 engines.

• Must use GMP-14088556 rear seal adaptor
• SH1796S cam bearings required

SBC Iron Small Block 1 Piece RMS
Deck Height ..................................................... 9.025"
Bore ..................................................... 4.00" 
Main Bearing Size ..................................................... 350 (2.45") 
Weight ..................................................... 205 lbs

OE roller cam compatible.........................................
Largest Recommended Bore ................................…… 4.030"
Camshaft Bearing Diameter ................................…… SBC - 2.00"
Camshaft Position ..........................................……… Standard SBC
Deck Thickness, min ..........................................……… .675"
Torque Specs - Main Caps 1 - 5 7/16" bolts 65 ft lbs  1 & 5 3/8" outer 40 ft lbs