Dart IMCA Hobby Stock Cast Iron Cylinder Head, Fits Chevy Small Block

Description: This Dart cylinder 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 Info IMCA Approved Stock Replacement Dart 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 IMCA Dart 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 retainersStock Car versions are .080" max flat milled w/ intake surface corrected to max out the compression rule for the IMCA Stock CarHobby Stock heads feature Speedway Motors 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. 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 Installation Tips 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 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 1.94 Spring Diameter 1.25 Stud Diameter 0.38 Exhaust Valve Diameter 1.5 Exhaust Valves Included Yes Intake Runner Volume Range 160cc - 169cc Exhaust Runner Volume Range 60cc - 69cc Exhaust Runner Volume 65cc Intake Runner Volume 165cc Intake Valve Angle 23 Valve Guide Material Integral, cast into head MFG. Part # 91624360-HS Reviews Nice casting but all 4 required surfacing Rated by JP on October 15, 2021 Summary: Bought 4 bare heads. Way cleaner casting quality than the EQ counterpart we were using prior. Made in the USA is a big plus for me. Required 2 passes on the surfacing machine to get them truly flat so you will spend a little on the touch up. Seats were spot on and sealed perfect out of the box. Spring pocket depth was spot on consistent. Yes, I recommend this product. I recommend this product to anyone Rated by Trev on January 26, 2021 Summary: Good product Yes, I recommend this product. Related Items / Suggested Parts Manley SBC Head Bolts and Washers Kit Tech Support We're here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through eBay Messaging and a knowledgeable Speedway Motors team member will be happy to help. 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 72 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.

Price: 574.99 USD

Location: Lincoln, Nebraska

End Time: 2024-12-11T03:55:57.000Z

Shipping Cost: 0 USD