Dart IMCA Approved Cast Iron Small Block Chevy Cylinder Heads

#91624360

Dart IMCA Approved Cast Iron Small Block Chevy Cylinder Heads

Name: Dart IMCA Approved Cast Iron Small Block Chevy Cylinder Heads
Brand: Speedway Motors
SKU: 91624360
Rating: 4.2 (6 reviews)

6 Reviews

2 Questions

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$463.99

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Product Summary

Bare Cylinder Head Style, Cast Iron, Natural

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Key Specs

Cylinder Head Style	Select Style
Material Type	Cast Iron
Finish	Natural
Combustion Chamber Volume	Select Style
Intake Runner Volume	165cc

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Details

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 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 high performance valve springs 180671515

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

CARB Warning

For race/ off road use only

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA WARNING:

Can expose you to lead, a carcinogen and reproductive toxicant. See www.P65Warnings.ca.gov

CARB warning

Specifications

KEY SPECS
MFG. Part #	Select Style to see
Brand	Speedway Motors
Cylinder Head Style	Select Style to see
Material Type	Cast Iron
Finish	Natural
Combustion Chamber Volume	Select Style to see
Intake Runner Volume	165cc

GENERAL
Exhaust Runner Volume	65cc
Combustion Chamber Volume Range	60cc - 69cc
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	1.94"
Intake Valves Included	Select Style to see
Intake Valve Angle	23 °
Exhaust Valve Diameter	1.5"
Exhaust Valves Included	Select Style to see
Valve Spring Included	No
Spring Diameter	1.25"
Damper Spring Included	Select Style to see
Valve Seat Machine Style	3-angle
Valve Seats Machined	Yes
Valve Seat Material	Powdered Metal
Valve Guide Material	Integral, cast into head
Locks Included	Select Style to see
Lock Style	7 Degree
Retainers Included	Select Style to see
Retainer Material	Steel
Stud Diameter	0.38"
Oiling Style	Through Pushrod
Sold in Quantity	Each

Ratings & Reviews

4.2

6 Reviews

Overall Assessment

Customers appreciate the product for its excellent casting quality, performance, and consistency, which are superior to competitor EQ. Also, the product being 'Made in USA' receives considerable appreciation. While customers have had to perform initial surfacing, the spot-on, consistent spring pocket depth and perfectly sealing seats out of the box are impressive. The product may require initial touch-ups, but its overall performance makes it a recommended purchase.

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4.2

6 reviews

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I would buy this product again

4.0

a year ago

Joe Shoup

Lamar Colorado

Verified

Hi Ron AMCA sport mode perfect for the class best flowing head there is.

Would Recommend

I would purchase this item again

5.0

a year ago

Riverside ia

Verified

Using on a sport mod. Good valve seating without any work

Would Recommend

great head for the money

5.0

4 years ago

don

bad xxx right out of the box love them no problmes

Would Recommend

Nice casting but all 4 required surfacing

4.0

5 years ago

Clovis CA

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.

Would Recommend

Heads

2.0

5 years ago

Evan

I bought these heads bare. Finally putting them together and not one valve seals up on the valve seats. So off to the machine shop to get fixed. Not a set of cheap affordable heads when you need to get them machined right out of the box.

Would Not Recommend

I recommend this product to anyone

5.0

5 years ago

Trev

Yreka ca

Verified

Good product

Would Recommend

Showing 6 of 6 reviews

Questions & Answers

2 Questions • 2 Answers

Sort Questions

using these on an IMCA Hobby stock, what spark plug do these take?

by Jeremy

• 2 years ago

1 answer

View Answer

On the impact hobby stock dart heads what is the max lift for the springs it comes with

by Eddie

• 4 years ago

1 answer

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2 of 2 questions shown