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CHEVY SMALL-BLOCK V8

24502615 -- Aluminum Cylinder Head, 15° This new 15° aluminum cylinder head is designed for small displacement racing engines that run competition eliminator. This head is identical to the 18° head, except the head is rolled by machining the deck surface at a 2° angle and thereby removing more material from the exhaust side of the head than the intake side. The valve guide holes are also tipped 1° in the casting to produce a total of 3° in valve angle. Smaller combustion chambers are the main advantage. The head does not have valve seats or valve guides and has 35 to 37cc chambers instead of 42 to 44cc in the 18° head. Technical Note: P/N 24502615 is made from the same casting (101343633) as the 10134364. This is not a "CNC" ported cylinder head. 24502559 -- SB2 Aluminum Racing Head These new SB2 (small block second generation) heads are designed for maximum effort competition, improved durability, simplified preparation procedures, and reduced overall cost of building and maintaining an S/B V8 racing engine. The intake valve ports are relocated to orient the intake runners toward the carburetor. The result is a distinctive "mirror port" arrangement that is a significant advance over conventional siamesed and symmetrical port designs. The exhaust ports remain in the traditional siamesed center port design with coolant passages between the ports that eliminate the need for additional machining and auxiliary water lines. SB2 heads provide "out of the box" airflow performance that is comparable with highly modified conventional castings. The revised valve layout improves valvetrain reliability by improving pushrod angularity and reducing or eliminating rocker arm offset. It also enhances piston durability by changing the depth and location of the valve pockets in the piston tops. The intake valve angles are 12° by 4° and the exhaust valve angles are 8°. The as-cast combustion chamber volume is 28cc; intake volume is 196cc. Recommended intake valves are 2.15" and exhaust valves 1.625" with valve length of 5.55" and valve seat intake 2.20" x .312" and exhaust 1.67" x .275". Technical Note: A Special block P/N 24502600 (with revised lifter spacing/ angles) is required only when using a flat tappet camshaft. These heads also require the following special components: upper intake manifold P/N 24502588, lifter valley cover P/N 24502587, spring oiler kit P/N 24502597, head gasket P/N 10185054 and rocker cover (not available). The following aftermarket items are available: head bolt kit from ARP P/N 234-4722; camshaft from crane flat tappet with 106° lobe separation P/N PL950266 and 109° lobe separation P/N PL950276 and roller cams are also available; rocker arms from Jesel; pistons from JE; special gaskets are required from Fel-Pro; valley cover P/N 1242; rocker cover P/N 1655; intake manifold, .030" thick P/N 1237, .045" thick P/N 1237-2, .060" thick P/N 1237-3, .090" P/N 1237-4, .120" thick P/N 1237-5. Wrench clearance for the nut on the short outer studs is limited. A 7/16" 12 point box end torque adapter (Mac Tools P/N XB142 with 3/8 drive) is recommended. 24502560 -- SB2 "CNC Ported" Aluminum Racing Head The CNC ported cylinder head is the same as base head P/N 24502559 except it is CNC ported. See the Quick Reference Head Chart in this section for port volume and related information.

24502517-- Splayed-Valve Cylinder Head "The splayed-valve cylinder head has 240cc intake runners." The splayedvalve casting has a .240" minimum port wall thickness that permits extensive modifications by cylinder head specialist seeking even more airflow. The intake valves are angled 16° to the deck surface and tilted (splayed) 4°. The exhaust valves are 11°, with a 4° tilt. This cylinder head has symmetrical intake and exhaust ports and can accommodate a 2.20" diameter intake valve and a 1.65" exhaust valve. Its nominal combustion chamber volume is 45cc, although the actual volume will depend on the seats and valves installed. Technical Notes: Does not include seats or valve guides. The intake valve location moves the valve .050 closer to the bore center line than the earlier P/N 10185040. The following items are available from GM for the installation of this cylinder head: Rocker arm stand P/N 10185041, Intake gasket P/N 10185042, Rocker cover gasket P/N 10185043, and Rocker cover P/N 10185045. The intake manifold and remaining valvetrain components will have to be purchased in the aftermarket or be fabricated.

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CHEVY SMALL-BLOCK V8

12480011 -- SB2.2 Aluminum Cylinder Head This aluminum cylinder head, designed for Winston Cup competition style racing, is very similar to the SB2 head P/N 24502559 released in 1996. This head was designed to improve durability, simplify preparation procedures, and reduce the overall cost of building and maintaining a small block racing engine. Intake ports are a "mirror" design; exhaust ports remain the same as original SB2. All eight ports are angled toward the center of the engine. The SB2.2 has an 11° by 4° intake valve angle and 8° exhaust. The intake valves centerlines were moved 0.250" closer to the intake flange and 0.080" toward the cylinder bore centerline. We recommend a 2.15" intake valve and overall length of 5.65", and the exhaust valves were moved 0.014" outward. The spark plug holes were moved 0.125" toward the center of the bore for combustion efficiency. This head is redesigned to use shaft mounted aftermarket rocker arms, and the rocker cover rail was rolled five degrees toward the intake flange to increase clearance for the intake rocker arms. The valve spring pads were increased for use of 1.625" valve springs. Material has been added to the deck surface for a 48cc combustion chamber, and with a flat top piston it gives 12.1:1 compression.

NOTES:

®NEW

12480021 -- Cylinder Head "SB2.2" This "CNC" SB2.2 aluminum small-block cylinder head is fully ported. It is the same as cylinder head P/N 12480011 except for the porting and beryllium copper valve seats and bronze valve guides.

NOTES

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CHEVY SMALL-BLOCK V8

SMALL-BLOCK V8 CYLINDER HEADS QUICK REFERENCE CHART

Part Number

10125377 12356026 3987376 464045 12558060

Intake Combustion Casting Runner Chamber Valve Description Number Material Volume (cc) Volume (cc) Diameter

Cyl. Head w/Valves Cyl. Head w/Valves Service replacement Service replacement L31 Service w/Valves L31 Service Bow Tie Corvette Design for 350 HO service engine LT4 service only Fast Burn w/valves Phase 6 Bow Tie (Bare) Raised Runner Bow Tie 14101083 14011083 14096217 3991492 462624 Iron Iron Cast iron Cast iron -- -- 157 161 170 64 64 64 76 64 I: 1.94" E: 1.50" I: 1.94" E: 1.50" I: 2.02" E: 1.60" I: 2.02" E: 1.60" I: 1.94" E: 1.50" I: 1.94" E: 1.50" I: 2.02" E: 1.60" I: 1.94" E: 1.50" I: 2.00" E: 1.55" I: 1.55" E: 2.00" NA NA

Spark Plugs

Straight Straight Straight Straight Straight

Heat Risers

Yes Yes Yes No No

Notes

350 285 HP service head w/valves & springs. 350 /300 HP service head w/ valves & springs. Screw-in studs, pushrod guideplates. LT1 1970 Design with guideplates. LT1 Design Port w/valves & springs. LT1 Design Port Off-highway cast iron head. Assembly with springs, valves, studs, and no guideplates. For LT1 or LT4 usage only Fast Burn w/valves & springs No seats, guides, and pushrod holes. Intake ports are .200" higher than standard location; no seats, guides, and pushrod holes. Guides supplied but not installed. 18° valve angle; no seats, guides. 18° valve angle; no seats, guides. 18° valve angle; no seats, guides. 18° valve angle; for 9.1 compression 18° valve angle; no seats, guides; for 9.1 engines. 18° CNC Ported for 9.1 Engines 15° valve angle; no seats,guides. Splayed Valve design. Intake valve at 12° & 4°. Intake valve at 12° & 4°. 8° Exhaust CNC w/seat & guides

10239906 Cast Iron or 12558062 10239906 Cast Iron or 12558062 14011034 10088113 Cast iron Aluminum

12529093 10134392 12556463

170 184 163

64 64 58

Straight Angled Angled

No No No

12363287 12464298 14011049 10051101

NA 12367713 14011049 10051101

Aluminum Aluminum Aluminum Aluminum

195 210 180 196

54.4 62 55 55

Angled Angled Angled Angled

No No No No

10033867

Pontiac Motorsports Bow Tie Low-Port Bow Tie High-Port Bow Tie High-Port CNC Machined Bow Tie High-Port Bow-Tie CNC High Port Bow-Tie Splayed Valve SB2 SB2 CNC Ported SB2.2 SB2.2 CNC Ported

10033867

Aluminum

196

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I: 2.100" E: 1.625" NA NA NA I: 2.150" E: 1.620" NA I: 2.150" E: 1.620" N/A NA I: 2.150" E: 1.625" I: 2.150" E: 1.625"

Angled

No

10134352 10134363 10134364 24502569 24502580 24502582 24502615 24502517 24502559 24502560 12480011 12480021

10134352 10134363 10134363 10134363 10134363 10134363 10134363 10185040 24502559 24502559 12480011 12480011

Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum

223 210 210 258 215 245 210 240 196 280

42 to 44 42 to 44 42 to 44 65 60 65 35 to 37 45 28 38 48

Angled Angled Angled Angled Angled Angled Angled Angled Angled Angled Angled

No No No No No No No No No No No No

I: 2.150" E: 1.625"

Angled

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CHEVY SMALL-BLOCK V8

GROUP 0.289 HEAD GASKETS AND COMPONENTS

12484788 -- Intake Valve Seat This valve seat fits fast burn cylinder head P/N 12464298. The diameter on this seat is 2.149" O.D. and 1.85" I.D. with a plus or minus .0005" and it is .312" thick with plus or minus of .002". Technical Note: The material iron alloy JP200 and heat treat to RC 33-39. 12484789 -- Exhaust Valve Seat This exhaust valve seat fits fast burn cylinder head P/N 12464298. The diameter on this seat is 1.688" O.D. and 1.330" I.D. with a plus or minus .0005", and it is .3125" thick with plus or minus of .0025". Technical Note: The material iron alloy JP200 and heat treat to RC 33-99.

Small-block cylinder head gaskets are available in a variety of materials and thicknesses to suit different applications. When selecting a head gasket, keep in mind the engine's intended usage and the minimum piston-to-head clearance required. (One gasket per part number.)

10159455 -- Composition Head Gasket This composition head gasket with stainless steel jacket is used on Chevrolet V8 302 - 400 CID engines with bore diameters from 4" to 4 1/8". The gasket has a compressed thickness of .039". 14096405 -- Composition Head Gasket This composition gasket has stainless steel on one side and graphite on the other side This gasket has a compressed thickness of .028".

10105117 -- Composition Head Gasket (Cast Iron or Aluminum Head) This composition head gasket with stainless steel faces is recommended for stock and mildly modified engines with 4.00" cylinder bores. Its compressed thickness is .028". 3830711 -- Steel Shim Head Gasket Recommended for stock and mildly modified engines with 4.00" cylinder bores. Compressed thickness is .026". 12557236 -- Composition Head Gasket For Corvette production aluminum cylinder heads. Compressed thickness is .051". This gasket's stainless steel fire rings prevent galvanic action between the aluminum head and cast iron block. (This gasket is used on 350 HO engines.) (Can be used on cast iron or aluminum heads.)

GROUP 0.293 HEAD BOLTS AND STUDS

585927 -- Cylinder Head Dowel Pin For all V6/90° and small-block V8s. 5/16" diameter by 9/16" long. 12495499 -- Bolt Kit, V8 Cylinder Head This kit includes all head bolts to complete the installation of iron or aluminum cylinder heads. These high quality bolts include thread sealer and washers. Technical Notes: This kit includes the following bolts : 14 of P/N 10168525, four of P/N 10168526, and 16 of P/N 10168527.

10185054 -- Heavy-Duty Composition Head Gasket This Teflon-coated gasket has solid pre-flattened wire O-rings around each cylinder. It is highly recommended for competition engines with 4.00" to 4.125" cylinder bores. Compressed thickness is .041". (Use with iron or aluminum heads). Technical Notes: This gasket does not require retorquing. Drill steam holes when using this gasket on 400ci small-blocks. This gasket has a bore of 4.166" and compressed volume of 9.1cc. 12363763 -- Head Gasket "Special Competition" This heavy-duty composition head gasket for iron or aluminum heads is teflon coated and has pre-flattened steel fire rings (this feature reduces head and deck surface galling). This gasket features a 4.200" bore for bowtie, 400 small blocks and aluminum blocks. This gasket does not have steam holes required for the production 400 S/B. It does have revised coolant hole pattern (this reduces coolant temperatures between the center bores). This head has compressed thickness of .038" with volume of 8.9cc and this does not require retorquing.

10168525 -- Long Head Bolt with Washer 7/16-14 x 313/16", for Corvette aluminum head. 14 required. 10168526 -- Medium Head Bolt with Washer 7/16-14 x 31/16", for Corvette aluminum head. 4 required. 10168527 -- Short Head Bolt with Washer 7/16-14 x 13/4", for Corvette aluminum head. 16 required. 14011040 -- Hardened Washer .45" ID x .778" OD 10051155 -- Hardened Washer .45" ID x .750" OD, for Phase 6 and raised runner aluminum heads.

14011040

10051155

60

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