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CHAMPIONSHIP ENGINE COMPONENTS<br />
MADE IN THE USA<br />
SHORT BLOCKS TOP KITS BLOCKS HEADS MANIFOLDS CRANKSHAFT ACCESS SBC LS BBC SBF HON COATINGS BILLET<br />
11°<br />
555cc<br />
CNC<br />
OVAL PORT<br />
QUICK INFO >>><br />
Maximum Top Sportsman, Top Dragster, Pro Mod and<br />
Pro Street competition. Excellent with alcohol and nitrous,<br />
over 7,000 RPM, over 500 cubic inches.<br />
The latest Big Chief evolution with an 11°<br />
valve angle, this head features a multitude of<br />
revisions: relocated valve centers, relocated<br />
port cores, and a redesigned valve train for<br />
increased power and reliability.<br />
With our sophisticated CNC machining programs,<br />
we can tailor a pair of Big Chief II<br />
heads to fit your exact engine combination.<br />
Copper seats are standard and assemblies come<br />
with Titanium valves. Standard 2.500"/1.850"<br />
intake/exhaust valves.<br />
Heads are sold individually.<br />
BIG CHIEF II 11° 555cc CNC - ALUMINUM (Oval Port Heads)<br />
PART NO. CONFIGURATION CNC PORTING PORT VOL. VALVES SPRINGS CYL. BORE<br />
18500000 Bare Head No Porting<br />
18575070 Bare Head Full Port 555cc 2.500"/1.850" 4.600"<br />
18575179 Assembly Full Port 555cc 2.500"/1.850" 1.650"T 4.600"<br />
BIG BLOCK CHEVY<br />
CAST ALUMINUM CYLINDER HEADS<br />
See page 94<br />
RECOMMENDED MANIFOLD<br />
BIG CHIEF II 11° 555cc CNC SPECS<br />
Material:<br />
RMR Cast<br />
Aluminum Alloy<br />
Valve Angle: 11°<br />
Intake Port Volume: 555cc CNC<br />
Intake Valve: 2.500”<br />
Exhaust Valve: 1.850”<br />
Chamber Volume: 56-90cc<br />
Intake Port Shape: Oval<br />
Port Location: Spread port<br />
FLOW DATA w/ 2.500-1.850 valves<br />
LIFT INTAKE EXHAUST<br />
.200” 168 136<br />
.300” 262 186<br />
.400” 338 232<br />
.500” 399 279<br />
.600” 456 321<br />
.700” 501 348<br />
.800” 521 357<br />
.900” 522 363<br />
1.000” 534 364<br />
43144000<br />
Box Ram<br />
Not intended for sale or use with pollution controlled vehicles.<br />
92<br />
248.362.1188 / DARTHEADS.COM Connect with us socially, search: DART MACHINERY
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