Big Chief 14 degree Oval Port CNC
PN: 18275179
Fully CNC Ported, Assembled Cylinder Heads, priced for EACH (2 needed)
1.650 Spring, Titanium Valves - Full package
Intake Port: 440cc Rect Port
Material: Aluminum
Chamber Size: 74cc or 85cc
Valve Size: Up to 2.40/1.90"
Maximum Pro Mod, Pro Street, Top Dragster& Top Sportsman Competition, excellent with alcohol & nitrous; Rectangular Port Design over 8000 rpm, over 500 ci
Dart
14 Degree Big Chief Aluminum Cylinder HeadPart#
18100000 thru 18300000Material:
355T6 alum alloyComb Chambers:
75cc as cast (82cc Tit, 87cc SS w/CNC)Intake Valve Dia:
2.400" std up to 2.500"Intake Port volume:
395cc as cast, FP CNC - 440cc Capable of 475cc +Intake Port Dim:
1.840" x 2.480" (as cast), , 1.890"w x 2.530"h (F/P)Int Port Location:
Raised 1.500" Spread portsIntake Gasket:
Fel-Pro# 1298 / Dart# 65124101Exh Valve Dia.:
1.900" stdExh Port volume:
170cc (as cast), 185cc (F/P)Exhaust Port Dim:
(As cast) 1.720"w x 1.680"h, (F/P) 2.100"w x 1.800"hExh Port Location:
Raised .900" Std chevy bolt patternExhaust Gasket:
Mr Gasket 5914Flow, Intake:
(F/P) 480 cfm @ .900" lift/28"Flow, Exhaust:
(F/P) 341 cfm @.900" lift/28"Manifold:
Dart Big Chief (opening-1.75"x 2.35") 4 bbl = 8" / Tunnel Ram = 10" tallMilling:
Min. 79cc / .020" max (.006" = 1cc) Flat mill only.Pistons:
Must use pistons for 14° Big Chief head.Push Rod length:
Should always measureRetainers:
Titanium 10°Spark Plug:
.750" reach, gasketed. Autolite AR3932Spring Cups:
1.625" - .035 cupSpring Pockets
1.740" OD for 1.625" cup (.030" deeper max)Springs:
optional triple: 1.625T = 330# @ 2.100" / .910" max Comp 948
Our Assembly: 1.625D = 250# @ 2.000" / .790" max Vasco-Jet H-11Valve Angles:
Int - 14°, Exh - 7°, 4° cantValve Length:
Int - 6.600" Exh – 6.450"Valve Stem Dia:
.3415" - 11/32"Valve Train:
Jesel or T&D 14° rocker systemValve Guides:
1/2" OD Mag - bronze Cut for .530" PC seals (.002" press)Valve Guide length:
3.000"Valve Guide clearance:
.0014" - .0021" (with our .3415 dia. valve stem)Valve Guide Spacing:
Widened for use on min. 4.400"- 4.625" boreValve Seats:
Ductile Iron, .006" pressValve Seat dim, Int
Program #3815 & #384 - 2.520" x 2.00" x .375" / Program #385 - 2.570"Exh
2.000" x 1.600" x .375"Valve Seat angles:
Int = 32° - 45° - 60° - 70° Exh = 37° - 45° - radiusStuds, head:
Must use Big Chief stud kit #66120015Titanium Valves
Must use lash capsTorque
Manifold = 35 ft/lb
: w/oil Head Bolts = 70 ft/lb Dart’s inner head studs 3/8-7/16 = 50 ft/lbBlock Use:
Mark IV, Gen V, Gen VI with proper head gasketWeight:
42 lbs
This product was added to our catalog on Friday 28 December, 2007.