Page 209 - 2021-22_EngineCatalogAP

CYLINDER HEADS
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 exhaust with 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° requires custom pistons, Brodix valve covers, head studs, shaft rockers, and a Brodix intake manifold specifically designed for the SR20 heads. Sold individually.
Dart Iron Eagle Heads
Economical cast iron, rectangular-port head is available with high-velocity 308cc or big displacement, high-revving 345cc intake runners, raised exhaust ports, heart-shaped combustion chambers, and hardened exhaust seats. Sold individually.
DRT15100010
Part No.
Description
Intake Runner
Comb. Chamber
Port Type
Valve Angle
Intake Valve
Exhaust Valve
BRO2208100
Assembled, 1.645" Springs,
315 lbs. Seat Pressure/Titanium Retainers
440cc
95cc
Rect.
20°/13°
2.400"
1.800"
Part No.
Description
Intake Runner
Comb. Chamber
Port Type
Valve Angle
Intake Valve
Exhaust Valve
DRT15100010
Bare Head
308cc
119cc
Rect.
24°/15°
2.250"
1.880"
DRT15100111
Assembled, 1.550" Single Spring, 145 lbs. Seat Pressure
308cc
119cc
Rect.
24°/15°
2.250"
1.880"
DRT15100112
Assembled, 1.550" Double Spring, 215 lbs. Seat Pressure
308cc
119cc
Rect.
24°/15°
2.250"
1.880"
DRT15200030
Bare Head
345cc
119cc
Rect.
24°/15°
2.300"
1.880"
DRT15200132
Assembled, 1.550" Double Spring, 215 lbs. Seat Pressure
345cc
119cc
Rect.
24°/15°
2.300"
1.880"
DRT15370030
Dart Iron Eagle Pro CNC, Bare Head
330cc
126cc
Rect.
24°/15°
2.300"
1.880"
Dart Pro 1 Aluminum Heads
DRT19100112
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.
Part No.
Description
Intake Runner
Comb. Chamber
Port Type
Valve Angle
Intake Valve
Exhaust Valve
DRT19100010
Bare Head
310cc
119cc
Rect.
24°/15°
2.250"
1.880"
DRT19100112
Assembled, 1.550" Double Spring 275 lbs. Seat Pressure
310cc
119cc
Rect.
24°/15°
2.250"
1.880"
DRT19200010
Bare Head
325cc
119cc
Rect.
24°/15°
2.250"
1.880"
DRT19200116
Assembled, 1.625" Double Spring 275 lbs. Seat Pressure
325cc
119cc
Rect.
24°/15°
2.250"
1.880"
DRT19300030
Bare Head
345cc
119cc
Rect.
24°/15°
2.300"
1.880"
DRT19300136
Assembled, 1.625" Double Spring 275 lbs. Seat Pressure
345cc
119cc
Rect.
24°/15°
2.300"
1.880"
DRT19474030
Dart Pro 1 CNC Ported Aluminum Heads
The first fully CNC-machined production head, available with 335cc or 355cc intake runners, rolled valve angles, raised exhaust ports, and fast-burn combustion chambers. Assembled versions include extra-long valves, 1.625" double springs, retainers, locks, and seals. Sold individually.
Part No.
Description
Intake Runner
Comb. Chamber
Port Type
Valve Angle
Intake Valve
Exhaust Valve
DRT19474030
CNC Ported, Bare Head
335cc
119cc
Rect.
24°/15°
2.300"
1.880"
DRT19574030
CNC Ported, Bare Head
355cc
119cc
Rect.
24°/15°
2.300"
1.880"
DRT19574136
Assembled, CNC,
1.625" Double Spring, 275 lbs. Seat Pressure
355cc
119cc
Rect.
24°/15°
2.300"
1.880"
2021-22 ENGINE BUILDER CATALOG 207
CHEVROLET BIG BLOCK