Dart IMCA Hobby Stock Cast Iron Small Block Chevy Cylinder Head

Description

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
Dart IMCA Hobby Stock Cast Iron Small Block Chevy Cylinder Head
Sku # 91624360-HS
Mfr. Part # 91624360-HS
Condition
New
Brand
Speedway Motors
Sold
Each
Details
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.
Info
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
(SCBARE) - IMCA Stock Car Bare Cylinder 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
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
WARNING: Cancer and Reproductive Harm -- p65Warnings.ca.gov
California Customers: This part has been identified as emissions sensitive and can only legally be installed on race-use only vehicles, off-road-use only vehicles, or pre-1965 vehicles in the State of California in accordance with the California Air Resource Board (CARB) requirements. Once your order is placed you will be contacted by Speedway Motors within 2 business days so that you can certify that you will only use such parts on these types of vehicles in California.
Specs
Sold in Quantity
Each
Finish
Natural
Cylinder Head Style
Assembled
Spark Plug Style
Straight
Material Type
Cast Iron
Combustion Chamber Volume
76cc
Intake Port Location
Standard
Intake Port Shape
Rectangle
Exhaust Port Shape
Square
Exhaust Port Location
Standard
Retainer Material
Steel
Lock Style
7 Degree
Valve Seat Machine Style
3-angle
Valve Seat Material
Powdered Metal
Oiling Style
Through Pushrod
Intake Valves Included
Yes
Damper Spring Included
Yes
Retainers Included
Yes
Locks Included
Yes
Valve Seats Machined
Yes
Intake Valve Diameter
1.940
Exhaust Valve Diameter
1.500
Exhaust Valves Included
Yes
Intake Runner Volume Range
160cc - 169cc
Exhaust Runner Volume Range
60cc - 69cc
Exhaust Runner Volume
65cc
Intake Runner Volume
165cc
Spring Diameter
1.250
Stud Diameter
0.380
Intake Valve Angle
23
Valve Guide Material
Integral, cast into head
MFG. Part #
91624360-HS
Reviews
I recommend this product to anyone
Rated
by Trev on January 26, 2021
Summary:
Good product
Yes, I recommend this product.
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About
Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 69 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.
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