LS1 SuperMax 250, Aluminium Cylinder Heads 11deg, Holden Chev, Bare

Proflow does not sacrifice quality for a low price--you get both with our aluminium cylinder heads. The lightweight heads are cast from A-356 aluminium alloy with a large choice of engine, for SB & BB Chevrolet, LS Chev Holden Ford SB 289-351W, 302, 351 Cleveland 2V & 3V & BB FE, and Chrysler SB & BB. They have phosphorous bronze valve guides, and ductile iron valve seats for use with unleaded gas. They're also end-milled and drilled for accessories. The fully assembled heads have stainless steel valves, high performance valve springs, 7 degree valve locks, rocker arm studs, and guideplates. Perfect for your Mild or High performance Hot Rod. 

Proflow's  SuperMax LS1 Cylinder Heads feature our Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. This budget friendly head is perfect for your OEM engine operating below 6300 RPM.

Spec;s

Head Gasket Cometic #C5475/5751-051 or equivalent
Head Bolts ARP #134-3610
Head Studs ARP #234-4317
Rocker Arms OE LS3 style ONLY (no stud/guideplate conversions etc.)
Intake Port (cc) 250cc
Intake Port Dimensions 3.22" x 1.12"
Exhaust Port (cc) 101cc
Exhaust Port Location Stock
Exhaust Port Dimensions 1.63" x 1.73"
Intake Valve Size 2.08"
Exhaust Valve Size 1.60"
Valve Angle 11°
Valve Spring Pocket O.D. 1.55"
Valve Guide Size 8mm .500" (Top) .560" (Base)
Deck Thickness .750"
Combustion Chamber (cc) 62cc
Spark Plug Size 14mm x .750" Gasket 
Spark Plug Location/Angle OE/Angle