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Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head

Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head

Chevy Small Block V8, Assembled Cylinder Head Style, Cast Iron, Natural

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Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
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Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
Dart IMCA Stock Car Cast Iron Small Block Chevy Cylinder Head
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  • This head is engraved with IMCA logo and serial numbered to make it approved for use in IMCA classes that allow the CH350I cylinder head
  • High-velocity 165cc/65cc intake/exhaust runners deliver strong mid-range torque
  • Assembled versions include 1.94"/1.50" standard length stainless steel valves, performance valve springs, retainers, keepers and 3/8" screw-in studs
  • SM version (Sport Mod) also has upgraded Comp Cams valve springs and lightweight Ferrea tool steel retainers
  • SC version (Stock Car) also has upgraded Comp Cams valve springs, lightweight Ferrea tool steel retainers, .080" milled deck w/ corrected intake for max compression

Details

Cylinder Head Style:
Assembled
Material Type:
Cast Iron
Finish:
Natural
Combustion Chamber Volume:
64cc
Intake Runner Volume:
165cc
Exhaust Runner Volume:
65cc
Intake Runner Volume Range:
160cc - 169cc
Exhaust Runner Volume Range:
60cc - 69cc
Spark Plug Style:
Straight
Intake Port Shape:
Rectangle
Intake Port Location:
Standard
Exhaust Port Shape:
Square
Exhaust Port Location:
Standard
Intake Valve Diameter:
1.940"
Intake Valves Included:
Yes
Intake Valve Angle:
23 °
Exhaust Valve Diameter:
1.500"
Exhaust Valves Included:
Yes
Spring Diameter:
1.250"
Damper Spring Included:
Yes
Valve Seat Machine Style:
3-angle
Valve Seats Machined:
Yes
Valve Seat Material:
Powdered Metal
Valve Guide Material:
Integral, cast into head
Locks Included:
Yes
Lock Style:
7 Degree
Retainers Included:
Yes
Retainer Material:
Steel
Stud Diameter:
0.380"
Oiling Style:
Through Pushrod
Sold in Quantity:
Each
MFG. Part #:
91624360-SC

Info

Garage Sale Product

This is garage sale priced because it was partially installed.

No Warranty, No Returns on Garage Sale Items    

 

IMCA Approved Stock Replacement Cylinder Heads

These Dart IMCA Approved cast iron Small Block Chevy cylinder heads are approved stock replacement heads for Hobby Stock, Northern & Southern Sport Mod, and Stock Car classes (using the 500 carbuertor). We begin with a Dart 10024360 Iron Eagle S/S 165 casting. Each head is engraved and serial-numbered to conform to IMCA rules.

After extensive research and development regarding the airflow capabilities and performance characteristics of this cylinder head versus previous models, IMCA approved this Speedway Motors-exclusive cylinder head and it's available for fast shipment in bare or assembled configurations.

Featuring precision cast ports and chambers, they have outstanding air flow. Assembled versions have optimized valve sizes for maximum performance within IMCA rules. 

(BARE) - Bare cylinder head

(HS) - IMCA Hobby Stock Heads

(SM) - IMCA Sport Mod Heads (Northern and Southern SportMod)

(SC) - IMCA Stock Car Heads 

Complete assembled versions include high-performance springs, 1.94"/1.50" standard length stainless steel valves, 7 degree locks and steel retainers with 3-angle valve jobs. 

  • Sport Mod and Stock Car versions includes high-performance COMP Cams valve springs and handle 0.550" net valve lift, with Ferrea tool steel retainers
  • Stock Car versions are .080" max flat milled w/ intake surface corrected to max out the compression rule for the IMCA Stock Car
  • Hobby Stock heads feature Speedway Motors USA-made high performance valve springs 180671515

Notes

  • Approved for IMCA Hobby Stock, Sport Mod and Stock Car classes (using 500 carb) as of 4/27/2020.
  • Assembled heads take approximately 1-2 days for assembly and will be shipped out promptly afterward. 

Specs

Material: Cast Iron

Comb Chambers: 64cc (SC) 76cc (SM/HS/BARE)

Intake Valve Dia: 1.940"

Intake Port volume: 165cc

Intake Port Dim: 1.100" W x 1.925" H

Int Port Location: Stock

Intake Gasket: Fel-Pro# 1204 or OEM type

Exh Valve Dia.: 1.500"

Exh Port volume: 65cc

Exhaust Port Dim: 1.340" W x 1.300" H

Exh Port Location: Stock location & bolt pattern

Exhaust Gasket: Fel-Pro# 1404

Flow, Intake: 210 cfm @ .500" lift / 28"

Flow, Exhaust: 138 cfm @ .500" lift / 28"

Head bolts: Stock bolts can be used

Milling: Min. 62cc = .060" (.0065" = 1cc) Flat Mill

Pistons: Most 23° aftermarket pistons.

Push Rod length: Stock (Stock length = 7.800") * Must measure *

Push Rod Guide: Stock type, integral

Retainers: Steel 1.250" = (7° )

Rocker Arm stud: Use screw-in stud w/integral nut

Spark Plug: Straight, .460" reach, tapered seat

Spring Cups: N/A, Use hardened shim or locator

Spring Pockets: Cut for 1.250" OD (.030" deeper max)

Valve Angles: 23°

Valve Length: STD = 4.890"

Valve Stem Dia: .3415" - 11/32"

Valve Guides: Integral cast into head

Valve Guide clearance: .002" - .0025" (with .3415 dia. valve stem)

Valve Guide Spacing: 1.890" moved .030" from stock

Valve Seals: Cut for umbrella seals

Valve Seats: Exh = Powdered Metal, .006" press

Valve Seat dim: Exh - 1.650" x 1.280" x .350"

Valve Seat angles:

  • Int = 32° - 45° - 60° - 70°- 80°
  • Exh = 37° - 45° - radius

Torque Specs:

  • Head Bolts = 70 ft/lb (w/ oil)
  • Rocker Studs = 55 ft/lb
  • Manifold = 35 ft/lb

Block Use: Any SBC, Iron or Aluminum

 

Weight: 52 lbs Bare – 58 lbs Assembled

Important Messages

  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
Some parts are not legal for use in California or other states with similar laws/regulations

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