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Technical information
Big block Chevrolet 330 CC rectangular port information Intake valve size 2.25” exhaust valve size 1.88” Intake port volume 330 CC Combustion chamber volume 121 CC. Mill .006 flat or .010 angle mill per approx 1 CC volume reduction. Head bolt/studs are for Dart Pro1, AFR heads. Bolts – ARP# 135-3605 Studs – ARP# 235-4106 Verify threads are not too long or short to give correct clamping/torque to engine block. Use Fel-Pro 1017-1 on Mark IV block or equivalent head gasket. Note, if using these heads on a Gen V or IV Block you will need to use head gasket for the later model block to prevent over heating. Fel-Pro 1047, Cometec C5434 or equivalent. Intake gasket: MRG 121 or equivalent. Use thread sealer if head bolt holes in block inter the water jacket. Torque in circular fashion per engine manufactures spec. Torque rocker stud to 45 ft lbs. Use sealer on rocker studs that protrude into intake port. If adjustable guide plate option has been purchased position guide plates so they land the rocker arm in the center of the valve stem. Tighten guide plate center clamp screw to 20 in pounds. Check pushrods for correct length Exhaust ports are raised .300". Alternator bracket hole located above the exhaust port is raised as well. The bracket will need to be modified to use this bolt hole. Spark plug recommendations: 3/4 reach 14mm thread Race NGK R5671-7 4091 hottest NGK R5671-84554 NGK R5671-95238 NGK R5671-105820 coldest Street NGK FR4 NGK FR5 Torque heads to 70 lbs or manufacture recommendation. Use hardened washer under head bolt/stud. Re-torque after several heat cycles. Break one bolt loose at a time and re-torque to bolt/stud spec. Rocker studs torque to 45lbs Always check piston to head clearance as well as piston to valve clearance. If you run a large dome piston it may be necessary to index the spark plug gap to be pointing down to avoid hitting the piston dome. If ground strap is too close use copper index spacer washers to obtain proper clearance. If using high lift roller cam springs. Use exhaust rocker stud that the base stud will reach all the way into the bottom hole such as: ARP 235-7203 or ARP 235-7206
Big block Chevrolet 305 CC oval port information. Intake valve size 2.25” exhaust valve size 1.88” Intake port volume 305 CC Combustion chamber volume 121 CC Mill .006 flat or .010 angle mill per approx 1 CC volume reduction. Head bolt/studs are for Dart 320 heads. Bolts – ARP# 135-3603 Studs – ARP# 235-4103. head bolts are available from Bruco Performance as well. Verify threads are not too long or short to give correct clamping/torque to engine block. Use Fel-Pro 10171 or equivalent head gasket. Needs 4.5" bore size. Note, if using these heads on a Gen V or IV Block you will need to use head gasket for the later model block to prevent over heating. Fel-Pro 1047 or equivalent. Intake gasket Fel-Pro 1212 or equivalent. Use thread sealer if head bolt holes in block inter the water jacket. Torque in circular fashion per engine manufactures spec. Torque rocker stud to 45 ft lbs. Use sealer on rocker studs that protrude into intake port. If adjustable guide plate option has been purchased position guide plates so they land the rocker arm in the center of the valve stem. Tighten guide plate center clamp screw to 20 in pounds. Exhaust ports are raised .300". Top alternator bolt hole above the number 1 and 2 exhaust port are raised to clear the higher exhaust port. Your alternator bracket will need to be modified to use this hole. Spark plug recommendations: Race 3/4 reach 14mm thread NGK R5671-7 4091 hottest NGK R5671-84554 NGK R5671-95238 NGK R5671-105820 coldest Street ¾ reach X 14mm thread NGK FR4 NGK FR5 Torque heads to 70 lbs or manufacture recommendation. Use hardened washer under head bolt/stud. Re-torque after several heat cycles. Break one bolt loose at a time and re-torque to bolt/stud spec. Rocker studs torque to 45lbs Always check piston to head clearance as well as piston to valve clearance. If you run a large dome piston it may be necessary to index the spark plug gap to be pointing down to avoid hitting the piston dome. If ground strap is too close use copper index spacer washers to obtain proper clearance. If using high lift roller cam springs. Use exhaust rocker stud that the base stud will reach all the way into the bottom hole such as: ARP 235-7203 or ARP 235-7206
Big block Chevrolet 290 CC CNC oval port information Intake valve size 2.25” exhaust valve size 1.88” Intake port volume 290 CC Combustion chamber volume 112 CC. Mill .006 flat or .010 angle mill per approx 1 CC volume reduction. Head bolt/studs are for Dart, AFR heads. Bolts – ARP# 135-3703 Studs – ARP# 235-4713. Verify threads are not too long or short to give correct clamping/torque to engine block. Use Fel-Pro 1017-1 on Mark IV block or equivalent head gasket. Note, if using these heads on a Gen V or IV Block you will need to use head gasket for the later model block to prevent over heating. Fel-Pro 1047, Cometec C5434 or equivalent. Intake gasket AFR 6863 Use thread sealer if head bolt holes in block inter the water jacket. Torque in circular fashion per engine manufactures spec. Torque rocker stud to 45 ft lbs. Use sealer on rocker studs that protrude into intake port. If adjustable guide plate option has been purchased position guide plates so they land the rocker arm in the center of the valve stem. Tighten guide plate center clamp screw to 20 in pounds. Be sure to check pushrods for correct length. Exhaust ports are raised .300". Alternator bracket hole located above the exhaust port is raised as well. The bracket will need to be modified to use this bolt hole. Spark plug recommendations: 3/4” reach 14mm thread Race NGK R5671-7 4091 hottest NGK R5671-84554 NGK R5671-95238 NGK R5671-105820 coldest Street NGK FR4 NGK FR5 Torque heads to 70 lbs or manufacture recommendation. Use hardened washer under head bolt/stud. Re-torque after several heat cycles. Break one bolt loose at a time and re-torque to bolt/stud spec. Rocker studs torque to 45lbs Always check piston to head clearance as well as piston to valve clearance. If you run a large dome piston it may be necessary to index the spark plug gap to be pointing down to avoid hitting the piston dome. If ground strap is too close use copper index spacer washers to obtain proper clearance. If using high lift roller cam springs. Use exhaust rocker stud that the base stud will reach all the way into the bottom hole such as: ARP 235-7203 or ARP 235-7206
Ford 185 CC cylinder head information Intake valve size 2.02” exhaust valve size 1.6” Intake port volume 185 CC Combustion chamber volume 64 CC Mill .006 flat mill. .010 angle mill per approx 1 CC volume reduction. Torque heads to manufactures bolt/stud spec. Use hardened washer under head bolt/stud. Use thread sealer if bolt holes in block inter the water jacket. Torque in circular fashion per engine manufactures spec. Verify your head bolts protrude through the cylinder head a sufficient length to insure a good gasket seal when torqued to the proper spec. If they are two short you will need to purchase a quality after market bolt and washer to insure proper head gasket seal. Use the supplied head bolt inserts when using 7/16 head bolts Verify you have correct piston to valve clearance. These heads have a smaller combustion chamber than some factory head and clearance may differ from the factory heads. If you're running a factory stock piston, check valve to piston radial clearance as well. Factory pistons do not have the valve relief for a 2.02 valve. Depending on the lift and duration of your camshaft the radial clearance of the valve relief may be insufficient. Check this! If your factory heads have a smaller intake valve than 2.02" verify valve pocket in piston is sufficient diameter to clear larger intake valve. ARP 154-3601 or 154-3701 or equivalent for proper bolts. Torque to manufactures spec. Torque rocker stud to 45 ft lbs. Use sealer on rocker studs that protrude into intake port. Spark plug requirements NGK R5671-7 4091 hottest NGK R5671-84554 NGK R5671-95238 NGK R5671-105820 coldest Lots of nitrous or boost. Street NGKFR4 NGKFR5 These heads use a rocker stud style that requires the end user to adjust valve lash. They are not torque down style as some years of Ford SBF heads are. If the user is unfamiliar with how to adjust valves in this particular manner it is strongly suggested to have a qualified mechanic/engine assembler do this for them. Spark plugs mentioned are recommendations. You may use which ever brand you chose to as long as they are 3/4" X 14mm. SBF 289-302 Windsor blocks that use 7/16 head bolts must use the press in bolt reduction buttons. SBF 351 Windsor blocks have 1/2 head bolts will not need the bolt reduction buttons. Head gasket: Fel Pro 1011-1 or equivalent for SBF Intake gasket: Fel Pro 1262 or equivalent for SBF Push rods must be hardened guide plate compatible If end user is assembling these heads purchased bare/empty on their own, it is the end users responsibility to verify all clearances are sufficient for their application.
How to adjust your valves How to adjust your valves. I get questions on a regular basis on how to adjust the valves after installing the heads. Here are a couple of different ways to accomplish this. I strongly suggest you adjust your valves before you install the intake manifold. With the intake manifold off it allows you to see the lifters and pushrods easily and you can also twist the pushrod between your fingers to help tell when the lifter plunger is about to be depressed. I also suggest leaving the spark plugs out as you will probably be turning the engine over by hand from the front dampener bolt. This 1st method also requires marking your harmonic dampener every 90 degrees from TDC. This will allow you to rotate your engine through its firing order as you move from cylinder to cylinder. Bring number 1 cylinder up to TDC compression stroke. When the #1 cylinder is at TDC compression, both of those lifters will be low in the lifter bore. Compare their position to cylinder #6, those lifters should be positioned higher in their bores. For #1 cylinder to be on its compression stroke both of the lifters will be lower in their bores than #6. If the opposite is true you need to rotate the engine another 360 degrees. Once you have established #1 cylinder is TDC on its compression stroke start tightening the adjusting nut on either the intake or exhaust valve. While tightening the valve rotate the pushrod between your fingers until you feel it starting to get some resistance between the rocker arm and the lifter. As you tighten down the adjusting nut you will see the lifter plunger start to collapse or the valve start to open. At that point tighten the adjusting nut 1/2 to 3/4 of a turn. Do this procedure to both valves of that cylinder. Once both valves have been adjusted for #1 cylinder turn engine over 90 degrees and move to the next cylinder in the engines firing order. Repeat the procedure of cylinder #1. Continue rotating the engine over 90 degrees at a time and run through the engines firing order until all 8 cylinders have been adjusted. A second way to adjust your valves is to rotate engine until the exhaust valve just starts to open. At that point adjust that cylinders intake valve in the same manner as described above. Continue going all the way down that engine side as each exhaust valve starts to open adjust is companion intake valve. When the intakes are adjusted start watching the intake valve motion. When the intake valve fully opens and is almost closed set its corresponding exhaust valve. Continue this procedure until all the valves have been adjusted on that side. After completion of exhaust and intake valves, move to the opposite side and repeat the procedure. When all else fails call me at 480 437 4997 and Ill try and walk you through it.