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800.979.0122

(CST) 7am - 10pm

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Mon-Fri 8am - 5pm

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RHS Pro Action Small Block Chevy Cast Iron Heads, 200CC / 50CC

SAME DAY SHIPPING! Order within the next 4 hours 44 minutes and receive same day shipping

RHS Pro Action Small Block Chevy Cast Iron Heads, 200CC / 50CC
RHS Pro Action Small Block Chevy Cast Iron Heads, 200CC / 50CC
RHS Pro Action Small Block Chevy Cast Iron Heads, 200CC / 50CC
RHS Pro Action Small Block Chevy Cast Iron Heads, 200CC / 50CC
RHS Pro Action Small Block Chevy Cast Iron Heads, 200CC / 50CC
RHS Pro Action Small Block Chevy Cast Iron Heads, 200CC / 50CC
RHS Pro Action Small Block Chevy Cast Iron Heads, 200CC / 50CC

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Details

Reviews

Q & A

What's in the Box

These heads deliver significant gains in both power and torque for all Small Block Chevy applications - right out of the box. Available for a variety of applications (see chart). All heads feature a multi-angle Serdi valve job.
  • Standard port 23° head
  • Accepts standard Chevy rocker arms and valve train components
  • Advanced port/runner/chamber design & modified water jacket for optimal performance & added reliability
  • Multi-angle intake & radiused exhaust valve seats for up to 5% more airflow 
  • 200cc recommended for 327-350 c.i. up to 400+ HP
  • 220cc recommended for 383-400+ c.i. up to 550+ HP

Application Chart (GIF)

Roller Ready - Please specify cam lift when ordering. 

Complete heads are made to order, please allow 3-4 days to assemble.

Specs

  • Recommended Spark Plug: 14 mm-5/8", .480 reach, tapered shaft
  • Approximate Compression Ratio Chevy 350 w/ Keith Black 474-120 flat top pistons:
    • 50cc = 12.04 to 1 

Customer Reviews

Rated 5 out of 5 by 1 reviewers.
RATING BREAKDOWN
1 reviews
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RECOMMEND THIS PRODUCT:

Raceaholic
Verified Purchaser
Tennessee

WOW !

February 25, 2011
These heads will wake up a lazy engine.
Yes, I recommend this product.
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Dart Iron Eagle Assembled Chevy Heads, Angle Plug, 200cc/64cc
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These complete Dart Iron Eagle Platinum cylinder heads are professionally assembled right here at Speedway Motors. We offer three different versions of each head (Street Ready, Flat Tappet Ready, Roller Ready) to perfectly suit your racing needs.

  • Standard 23 degree valve angle
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  • Spark plug holes are machined for tapered seat 5/8" hex "peanut" spark plugs
  • Dual bolt pattern accepts flange mount and center bolt valve covers

Head Application Chart (GIF)

Roller Ready - Please specify cam lift in comments section when ordering.

Iron Eagle Tech Notes (PDF)

Dart Installation Note (PDF)

Recommended Spark Plug: 14 mm, 5/8" hex, .460 reach, taper seat

Item Details

Angle Plug
200cc Intake Runner, 64cc Combustion Chamber
World Sportsman II Small Block Chevy Iron Heads, Straight Plug
(Part #8241122)
                        

The industry’s most popular true high performance cast iron cylinder head has been continuously improved since its introduction over 20 years ago. With 200cc intake and 69cc exhaust ports, World’s Sportsman II heads offer 30-70 horsepower gains over OEM heads, yet are 50-state emissions legal.

  • Bolt on from 30 to 70 additional H.P. (Dyno Proven)
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  • Recommended spark plug is a 14mm-5/8", .460" reach with a tapered seat

Sportsman II Application Chart (GIF)

824-1112 Instructions (PDF)

Please specify cam lift in comments section when ordering heads.

Assembled heads are built to order. 

Item Details

Straight Plug, 64cc Chambers
Autolite AR93 Power Tip Spark Plug 5/8 Hex .708 Reach Tapered Seat Med
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Autolite Racing spark plugs feature a cut back ground electrode, anti-corrosive nickel plating, and large ground electrode for better heat transfer. Heat range medium. 

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  • Non-resistor
  • Vendor Number: AR93

Note: Please use the Vendor Number to reference the PDF chart links listed.

Heat Range Chart (PDF)

Racing Plug Tech Note (PDF)

Understanding Heat Range (PDF)

Autolite Cross Reference Chart (PDF)

Item Details

.708" Reach 5/8" Hex Tapered Seat Power Tip
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Autolite Racing spark plugs feature a cut back ground electrode, anti-corrosive nickel plating, and large ground electrode for better heat transfer. Heat range medium. 

  • Standard tip
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Note: Please use the Vendor Number to reference the PDF chart links listed.

Heat Range Chart (PDF)

Racing Plug Tech Note (PDF)

Understanding Heat Range (PDF)

Autolite Cross Reference Chart (PDF)

Item Details

Medium
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Speedway 1957-85 Chevy 283-350 Complete Gasket Set
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Speedway Chevy gaskets are for 2-piece rear main blocks. Oil pan gasket can be used with either RH or LH dipsticks and includes both thin and thick seals. Valve cover gaskets are 5/16" rubberized cork suitable for racing.

  • Suitable for engines up to 600 h.p. 
  • Intake Gasket: 1205 style, 1.28" x 2.09"

Item Details

1957-85 w/ 4.00" Bore