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Big Chief 18* Pro 1 - Assembled

$2,169.00

DART Big Chief 18* Heads

  • Pro 1
  • Assembled w/ 1.625" Dual Springs - 100% All DART Components, Not Cheap replacements!
  • PN: 18474136
  • Priced Per Head (2 required)
  • Rectuangular Port
  • 4.500 or 4.600 Cylinder Bore - Please specify

Dart Big Chief cylinder heads are the most powerful big-block heads you can buy! These heads put Pro Stock technology within the reach of every racer and engine builder. They have what it takes to win today: spread intake ports, shallow valve angles, efficient combustion chambers, raised exhaust runners, and a valvetrain that’s reliable at high-rpm.

NEW 11° and 14° oval port designs raise the performance bar even further, with flow rates as high as 545 cfm. With our sophisticated CNC machining programs, we can tailor a pair of Big Chief heads to fit your exact engine combination.


We have everything you need to build a complete Big Chief engine, including intake manifolds, valve covers, gaskets, and valvetrain components.
If you’re serious about winning, run with the Big Chiefs - or stay on the trailer!

Specs from DART:

Part#

18000000 I-038A

Material:

355T6 alum alloy

Comb Chambers:

85cc as cast (95cc Tit, 100cc SS w/CNC)

Intake Valve Dia:

2.400”

Intake Port volume:

395cc as cast, SM-402cc, FP-424cc

Intake Port Dim:

1.800” x 2.500” (as cast), 1.810” x 2.525” (S/M), 1.890” x 2.530” (F/P)

Int Port Location:

Raised 1.500” Spread ports

Intake Gasket:

Fel-Pro# 1298

Exh Valve Dia.:

1.900”

Exh Port volume:

175cc (S/M), 185cc (F/P)

Exhaust Port Dim:

(As cast & S/M) 2.000” x 1.680”, (F/P) 2.100” x 1.800”

Exh Port Location:

Raised .900” Std chevy bolt pattern

Exhaust Gasket:

Mr Gasket 5914

Flow, Intake:

(S/M) 444 cfm @ .800”, (F/P) 492 cfm @ .900” lift/28”

Flow, Exhaust:

(S/M) 301 cfm @ .800”, (F/P) 343 cfm @.900” lift/28”

Manifold:

Dart Big Chief (opening - 1.750”x 2.350”) 8.00” tall

Milling:

Min. 92cc / .020” max (.006” = 1cc) Flat mill only.

Pistons:

Must use pistons for Big Chief.

Push Rod length:

Should always measure

Retainers:

Titanium 10°

Spark Plug:

.750” reach, gasketed. Autolite AR3932

Spring Cups:

1.625” - .035 cup

Spring 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-11

Valve Angles:

Int - 18°, Exh - 9°, 4° cant

Valve Length:

Int - 6.600” Exh - 6.450” Our assemblies w/ SS – 6.380”

Valve Stem Dia:

.3415” - 11/32”

Valve Train:

Jesel or T&D rocker system

Valve 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. 4.375” bore

Valve Seats:

Ductile Iron, .006” press

Valve Seat dim.

Int. - 2.490” x 2.000” x .375” Exh - 2.000” x 1.600” x .375”

Valve Seat angles:

Int = 32° - 45° - 60° - 70° Exh = 37° - 45° - radius

Studs, head:

Must use Big Chief stud kit #66120015

Titanium Valves

Must use lash caps

Torque:

Manifold = 35 ft/lb

Head Bolts = 70 ft/lb Dart’s inner head studs 3/8-7/16 = 50 ft/lb

Block Use:

Mark IV, Gen V, Gen VI with proper head gasket

Weight:

42 lbs

Add to Cart:

  • Model: 18474030
  • Shipping Weight: 45lbs
  • 100 Units in Stock
  • Manufactured by: DART


This product was added to our catalog on Friday 28 December, 2007.