Proflow does not sacrifice quality for a low price- you get both with our aluminium cylinder heads. Our LS3 cylinder heads are designed for street / race performance engines to give the ultimate in flow at a competitive price. Cast from A356 aluminium, these 15 LS3 rectangle port heads are designed to fit LS series engines with a 4.00" or larger bore. These bare 275cc heads accept 2.165" diameter intake valves and 1.60" exhaust valves and have a 0.625" deck thickness. Suits 6-bolt standard or LSX block designs.

SPECIFICATIONS
Combustion Chamber 70 cc
Intake Port Volume 260 cc
Intake Port Dimensions 2.62” (H) x 1.31” (W)
Exhaust Port Volume 104 cc
Exhaust Port Dimensions 1.70” (H) x 1.815” (W)
Spark Plug Location OEM
Intake Valve Diameter 2.165”
Exhaust Valve Diameter 1.60”
Valve Stem Diameter 8 mm
Valve Spring Pocket ID 1.64”
Valve Guide OD 0.502” (0.560” at base)
Maximum Valve Lift 0.750”
Rocker Stud Thread Size OE LS3 Style
Valve Angle 11
Deck Thickness 0.750”

Proflow does not sacrifice quality for a low price- you get both with our aluminium cylinder heads. Our LS3 cylinder heads are designed for street / race performance engines to give the ultimate in flow at a competitive price. Cast from A356 aluminium, these 15 LS3 rectangle port heads are designed to fit LS series engines with a 4.00" or larger bore. These bare 275cc heads accept 2.165" diameter intake valves and 1.60" exhaust valves and have a 0.625" deck thickness. Suits 6-bolt standard or LSX block designs.

SPECIFICATIONS
Combustion Chamber 70 cc
Intake Port Volume 260 cc
Intake Port Dimensions 2.62” (H) x 1.31” (W)
Exhaust Port Volume 104 cc
Exhaust Port Dimensions 1.70” (H) x 1.815” (W)
Spark Plug Location OEM
Intake Valve Diameter 2.165”
Exhaust Valve Diameter 1.60”
Valve Stem Diameter 8 mm
Valve Spring Pocket ID 1.64”
Valve Guide OD 0.502” (0.560” at base)
Maximum Valve Lift 0.750”
Rocker Stud Thread Size OE LS3 Style
Valve Angle 11
Deck Thickness 0.750”

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