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| Specifications & Features: | |
| Material | A356.2 Aluminum |
| Intake Port Volume | 290cc |
| Intake seat size | 2.25 OR 2.30 |
| Exhaust seat size | 1.88 |
| Intake Port Dimension | 2.030"H x 1.830"W x1/2 Radius |
| Intake Port Location | Stock |
| Exhaust Port Volume | 135cc |
| Exhaust Port Dimension | 1.770"H x 2.010" W |
| Exhaust Port Location | .375" Raised |
| Combustion Chamber Size | 112cc |
| Valve Cover Bolt Pattern | Perimeter Bolt |
| Valve Angle | 24°/4° Int, 15°/4° Exh |
| Valve Spring Pocket Diameter | 1.725" O.D |
| Max Valve Spring Pocket Machining | 1.750" O.D |
| Deck Thickness | .750" |
| Minimum Bore Diameter | 4.250" |
| Flat Mill | .006" per cc/ Maximum 102cc |
| Angle Mill | .009" per cc/ Maximum 97cc |
| Note:Angle mills might require a .120" Thick intake gasket. | |
| Minimum Cross Sectional Area | 2.895 sq. in. |
| Spark Plug Dimensions | 14mm x .750" w/Gasket Seat |
| Intake Valve Seat Machine Style: | 5-angle |
| 11/32" Intake Valve, 2.250" x 5.500" O.A.L |  |
| 11/32" Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve Length | |
| Racing Springs#1940 1.550" O.D. Hydraulic Roller Dual Valve Spring, 175 lbs. on seat, .725" maximum lift, 473lbs @ .600 lift, Max RPM 6500-6700 | |
| Racing Spring 1.550 O.D. Solid Roller Valve Spring, 220lbs on seat, .710" Maximum Lift, Max RPM 7200-7400 (upgrades available) | |
| Manley 10° Steel Retainers 1.500" O.D x 1.120"I.D x .705" I.D | |
| 10° 11/32" Valve Locks with lashcap recess | |
| ARP 7/16" Rocker Exhaust Studs | |
| ARP 7/16" Rocker Intake Studs | |
| 3/8" Guide Plates | |
| 11/32" Viton Valve Seals | |
| Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D | |
| Intake Valve Seats 2.450" O.D x 1.950" I.D x .375" Deep | |
| Exhaust Valve Seats 2.000" O.D x 1.580" I.D x .375" Deep | |
| 11/32" Intake Bronze Valve Guides .502" O.D x 2.10" O.A.L | |
| 11/32" Exhaust Bronze Valve Guides .502" O.D x 2.25" O.A.L | |
| Recommended Components: | |
| Intake Port Gasket | |
| Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit the heads. | |
| Exhaust Port Gasket | |
| Head Gasket, Fel-Pro #1047 (Mark V and VI) | |
| Head Gasket,, Fel-Pro #1017-1 (Mark IV) | |
| Head Bolts, ARP 135-3703 (Mark IV) | |
| Head Bolts, ARP 135-3707 (Mark V) | |
| Head Studs, ARP 235-4713 | |
| Head Bolt Washers, Manley | |
| Stud Girdle | |
| 7/16 Stud Mount Rocker Arms - 1.7 Ratio (For Optimized Geometry) | |
| 1.7 Shaft Mount Rocker Arms T&D | |
| Suggested Manifold | Victor Jr |
| Suggested Manifold | RPM Performer |
| Spark Plug Starting Range | Autolite 3924 |
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