Subtotal: NZD $91,045.13
Subtotal: NZD $91,045.13
NZD $2,855.85
2 in stock
Proflow Cylinder Heads, AirMax 290, Aluminium, BB Chevrolet, Bare
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Proflow does not sacrifice quality for a low price–you get both with our aluminium cylinder heads. The lightweight heads are cast from A-356 aluminium alloy with a large choice of engine, for SB & BB Chevrolet, LS Chev Holden Ford SB 289-351W, 302, 351 Cleveland 2V & 3V & BB FE, and Chrysler SB & BB. They have phosphorous bronze valve guides, and ductile iron valve seats for use with unleaded gas. They’re also end-milled and drilled for accessories. The fully assembled heads have stainless steel valves, high performance valve springs, 7 degree valve locks, rocker arm studs, and guideplates. Perfect for your Mild or High performance Hot Rod.
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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 | Aftermarket |
Suggested Manifold | Victor Jr |
Suggested Manifold | RPM Performer |
Spark Plug Starting Range | Autolite 3924 |
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