CYLINDER HEADS
Chevrolet Big Block 396-454 (Cont.) Brodix SR20 Series Aluminum Heads The Brodix SR20 cylinder head is the cutting edge of the conventional big block Chevy style heads. Inspired by TPSA technology, the SR20 boasts a .500" raised CNC-ported 440cc intake port flowing 507 CFM and the exhaust 335 CFM right-out-of-the-box. The newly designed 95cc combustion chamber houses a 2.400" intake and 1.800" exhaust (11/32" stem diameter) valves. The intake valve angle of 20 degrees requires custom pis- tons, Brodix valve covers, head studs, shaft rockers, and a Brodix intake manifold specifically designed for the SR20 heads. Sold individually. BRO2208000
Intake Runner
Comb. Chamber
Port Type Rect
Valve Angle 20°/13° 20°/13°
Intake Valve 2.400" 2.400"
Exhaust Valve
Part No.
Description
BRO2208000 BRO2208100
Bare
440cc 440cc
95cc 95cc
1.800" 1.800"
Assembled - 1.645" Spring, 315 Lbs. Seat Pressure/Titanium Retainers
Rect
Dart Heads Iron Eagle Head Economical cast iron, rectangular port head is available with high velocity 308cc or big dis- placement, high revving 345cc intake runners, raised exhaust ports, heart-shaped combus- tion chambers, and hardened exhaust seats. Sold individually.
DRT15100010
Intake Runner
Comb. Chamber Port Type
Valve Angle 24°/15° 24°/15° 24°/15° 24°/15° 24°/15° 24°/15° 24°/15° 24°/15°
Intake Valve 2.250" 2.250" 2.250" 2.300" 2.300" 2.300" 2.300" 2.300"
Exhaust Valve
Part No.
Description
DRT15100010
Bare
308cc 119cc 308cc 119cc
Rect Rect Rect Rect Rect Rect Rect Rect
1.880" 1.880" 1.880" 1.880" 1.880" 1.880" 1.880" 1.880"
DRT15100111 Assembled, 1.550" Single Spring, 145 Lbs. Seat Pressure
DRT15100112 Assembled, 1.550" Double Spring, 215 Lbs. Seat Pressure 308cc 119cc
DRT15200030
Bare
345cc 119cc
DRT15200132 Assembled, 1.550" Double Spring, 215 Lbs. Seat Pressure 345cc 119cc DRT15200136 Assembled, 1.625" Double Spring, 275 Lbs. Spring Pressure 345cc 119cc
DRT15370030 DRT15372136
CNC Ported - Bare - Iron
330cc 126cc 308cc 126cc
CNC Ported - Assembled - 1.625" Dual Spring - 250 Lbs. Seat Pressure
Dart Heads Pro 1 Aluminum Head Pro 1 head has rolled over valve angles, raised exhaust ports and fast-burn combustion chambers. Available bare or fully assembled in three different intake runner sizes. Sold individually.
DRT19100112
Intake Runner
Comb. Chamber
Port Type Rect Rect Rect Rect Rect Rect
Valve Angle 24°/15° 24°/15° 24°/15° 24°/15° 24°/15° 24°/15°
Intake Valve 2.250" 2.250" 2.250" 2.250" 2.300" 2.300"
Exhaust Valve
Part No.
Description
DRT19100010
Bare
310cc 310cc 325cc 325cc 345cc 345cc
119cc 119cc 119cc 119cc 119cc 119cc
1.880" 1.880" 1.880" 1.880" 1.880" 1.880"
DRT19100112 Assembled, 1.550" Double Spring 275 Lbs. Seat Pressure
DRT19200010
Bare
DRT19200116 Assembled, 1.625" Double Spring 275 Lbs. Seat Pressure
DRT19300030
Bare
DRT19300136 Assembled, 1.625" Double Spring 275 Lbs. Seat Pressure
DRT19900010
Dart SHP Aluminum Head The NEW Dart SHP aluminum head features a compact heart-shaped 110cc combustion chamber for increase compression on stock type big blocks. Features include; 2 degree rolled valve angles, improved spark plug location, extra long intake valves, raised exhaust ports, multi-angle intake and radiused hardened exhaust seats, long wear bronze guides, screw in studs, hardened exhaust seats are all standard. Sold individually.
Intake Runner
Comb. Chamber
Port Type Oval Oval
Valve Angle 24°/15° 24°/15°
Intake Valve 2.250" 2.190"
Exhaust Valve
Part No.
Description SHP, Bare SHP, Bare
DRT19900010 DRT19900070
275cc 275cc
110cc 110cc
1.880" 1.880"
2018 ENGINE BUILDER CATALOG
161
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