68276 PWHeads Chevrolet LS3 LSx 273cc 15 Degree Rectangle Port Aluminum Cylinder Heads Pair (bare)
Alternative Views:	LS3 15 Degree Rectangle Port Chevrolet heads designed to fit LS large bore engines. 273cc intake runners, 69cc combustion chambers. 2.165" intake and 1.59" exhaust. Machined for 1.30" springs. 6-bolt per cylinder design (Fits LSX blocks too). Requires OE LS3 rocker arm rails (GM#12600936). Manufactured from A356-T6 aluminum. Each pair comes with a detailed flow sheet. Sold bare and ready for assembly. Pair. Download Data here - DOWNLOAD NOTE: MUST USE THREAD SEALANT ON ROCKER STAND BOLTS AS THEY INTERSECT THE INTAKE PORTS! Everyday Low Price: CDN $1,149.99 Stock Status:In Stock Product Code: 68276 Qty:

Description Technical Specs   LS3 15 Degree Rectangle Port Chevrolet heads designed to fit LS large bore engines. 273cc intake runners, 69cc combustion chambers. 2.165" intake and 1.59" exhaust. Machined for 1.30" springs. 6-bolt per cylinder design (Fits LSX blocks too). Requires OE LS3 rocker arm rails (GM#12600936). Manufactured from A356-T6 aluminum. Each pair comes with a detailed flow sheet. Sold bare and ready for assembly. Pair. Download Data here - DOWNLOAD NOTE: MUST USE THREAD SEALANT ON ROCKER STAND BOLTS AS THEY INTERSECT THE INTAKE PORTS! NOTE: MUST USE THREAD SEALANT ON ROCKER STAND BOLTS AS THEY INTERSECT THE INTAKE PORTS! Uses standard length LS3 2.165" x 4.89"/1.59" x 4.91" valves Head Gasket Cometic #C5751-051 or equivalent Head Bolt Torque Refer to OE spec Head Bolts ARP #134-3610 Head Studs ARP #234-4317 Rocker Arms OE LS3 style (rails required) Intake Port (cc) 273cc Intake Port Dimensions 2.60" x 1.285" Exhaust Port (cc) 90cc Exhaust Port Location Stock Exhaust Port Dimensions 1.47" x 1.64" Exhaust Gasket Fel-Pro #1438 or equivalent Intake Valve Size 2.165" Exhaust Valve Size 1.59" Valve Angle 15° Valve Spring Pocket O.D. 1.30" Valve Guide Size 8mm .500" (Top) .560" (Base) Deck Thickness .625" Combustion Chamber (cc) 69cc Spark Plug Size 14mm x .750" Gasket (eg. Autolite #3923) Spark Plug Location/Angle OE/Angle Optional Parts Intake Valves = PW #360050 Exhaust Valves = PW #360049

Share your knowledge of this product. Be the first to write a review »

Browse for more products in the same category as this item: Categories A-H > Cylinder Heads (PW Heads) > Chevrolet Cylinder Heads