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Ships within 48 hours · Estimated delivery Nov 13 - Nov 18
STS BB-1 427 - 502 12
The Dart Special High Performance blocks are machined using precision
Polished NOVI-1200 420HP 385TQ make offer 1001852 2007-2008 4
RR BB-O 270cc 119cc 2
AFR 1680/1690 LS1 245/65 OR 73CC .650 LIFT ASSEMBLED YOUR CHOICE OF CHAMBER SIZE injection STS BB-1 427 - 502CALL SHANON AT 507 445 3235 WITH ANY QUESTIONS. Our max effort cathedral port head for the LSX platform is recommended for race applications or radical "Pro Street" builds with displacements up to 454 cubic inches, operating at or below 6800 RPM. Requires a minimum bore size of 4. 000" to clear the supplied 2. 165" intake valve. 245cc Aluminum LS1 Cylinder Heads Part # Description Combustion Chamber 1680 Large Bore (4. 000+) 65cc 1690 Large Bore (4.