Dart BBC Pro1 345 Cylinder Heads

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Product Description

Part#19300000

Material: 355T6 alum alloy
Comb Chambers: 121cc
Intake Valve Dia: 2.300”
Intake Port Dim: 1.700” x 2.430”
Int Port Location: Stock
Intake Gasket: Mr Gasket# 121
Exh Valve Dia.: 1.880”
Exh Port volume: 129cc
Exhaust Port Dim: 1.650” x 1.800”
Exh Port Location: Raised .300” Std bolt pattern
Exhaust Gasket: Fel-Pro 1412
Exhaust Bolts: 1” longer than stock (4) ea.
Flow, Intake: (310) 369 cfm (325) 376 cfm (345) 397 cfm @.800 lift/28”
Flow, Exhaust: 266 cfm @.800 lift/28” (Our valves, +10/15 cfm better)
Head Bolts/studs: Bolts – ARP# 135-3603 Studs – ARP# 235-4103
Manifold:Rect. Port Dart (opening – 1.575”x 2.250”) 6.25” tall
Milling:Min. 108cc. (.005” = 1cc) Flat mill only.
Pistons: Most aftermarket pistons.
Dart BBC Adjustable Guide Plate
Retainers: 1.625” – Tit / 1.550” – Moly Steel (10°)
Spark Plug: .750” reach, gasketed. Autolite Ar3933 Street AR3924
Spring Cups: 1.625” – .035 cup / 1.550” – ID locator
Spring Pockets: 1.740” OD for 1.625” cup (.030” deeper max)
Springs: Our Assembly:1.550S = 145# @1.900” / .660” max Comp 936
1.550D = 195# @ 1.900” / .690” max Comp 954
1.625D = 250# @ 2.000” / .790” max Vasco-Jet H-11