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HEAD BUILD KITS
Speedmaster offers most of our heads as bare castings, or professionally assembled. When we assemble heads, extra time is taken to set them up for YOUR application. All you have to do is choose the head casting you want and the type of cam you want the springs to work with.
HEAD BUILD KIT OPTIONS:
TYPE HEAD BUILD KIT CLOSED SEAT PRESSURE OPEN SEAT PRESSURE MAX. LIFT Hydraulic Flat Tappet Hydraulic Flat Tappet Solid Flat Tappet Hydraulic Roller Hydraulic Roller Solid Roller Race Solid Roller
HBK61 HBK61-10 HBK62 HBK63 HBK63-10 HBK64 HBK65
110 LBS 110 LBS 125 LBS 145 LBS 145 LBS 210 LBS 300 LBS
300 LBS 300 LBS 320 LBS 360 LBS 360 LBS 450 LBS 700 LBS
. 550”. 550”. 580”. 580”. 580”. 650”. 800”
INTAKE / EXHAUST GASKETS The Speedmaster heads are designed around using factory replacement gaskets.
We offer two different styles of intake gaskets. The Speedmaster SM-IG304 is a paper style gasket for people looking for the lowest cost option, or head porters that are want a plain gasket they can trim to fit enlarged ports. We also have a premium Printed Sealer type gasket, Speedmaster PN # SMIG304R.
HEAD GASKETS Because our VN head is designed as a performance replacement for the factory head, you can use any OEM style head gaskets.
We prefer our Speedmaster MLS head gasket pn # SM5229. With all stainless construction, you won’ t find a better gasket anywhere! If you prefer Fel-Pro, use Fel-Pro # 1059 headgaskets.
HEAD BOLTS / STUDS The head bolts / studs required are the same as factory Holden heads.
Speedmaster offers a 190,000 psi. head stud kit to suit our VN perfectly! the part number is SM2462
ARP also offers both head bolts and head stud kits. Their head bolt kit is # 205-3601 and the head stud kit is # 205-4601. Be careful to torque the heads following the OEM sequence in 3 steps to a final torque setting of 65lbs. using high pressure molly lube under the nuts and on the exposed threads of the studs.
SPARKPLUGS Our Holden 304-308 cylinder heads require the use of a 14m. thread, 5 / 8” hex,. 750” reach spark plug. Below you will find a list of some plugs that fit and work with our heads:
NGK- BCPR6ES, R5671A-7, R5671A-8 Autolite- 3923, 3924, AR3933, AR3934 Champion- RC12YC, RC10YC4, RC9YC3 Remember that you need a COLDER plug when you make more power, ie. N2O, Turbo and Supercharging!
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