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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.
The following head build kits apply to part number range: SM3002 | SM3003 | SM3009 | SM3010 | SM3101
HEAD BUILD KIT OPTIONS:
TYPE HEAD BUILD KIT CLOSED SEAT PRESSURE OPEN SEAT PRESSURE MAX. LIFT
Hydraulic Flat Tappet Solid Flat Tappet Hydraulic Roller Solid Roller Race Solid Roller |
HBK01 HBK02 HBK03 HBK04 HBK05 |
110 LBS 125 LBS 145 LBS 210 LBS 300 LBS |
|
|
300 LBS 320 LBS 360 LBS 450 LBS 700 LBS |
. 550”. 580”. 580”. 650”. 800” |
The following head build kits apply to part number range: SM3020 |
|
Hydraulic Flat Tappet
Solid Flat Tappet
Hydraulic Roller
Solid Roller
Race Solid Roller
|
HBK11 HBK12 HBK13 HBK14 HBK15 |
110 LBS 125 LBS 145 LBS 210 LBS 300 LBS |
300 LBS 320 LBS 360 LBS 450 LBS 700 LBS
. 550”. 580”. 580”. 650”. 800”
HEAD GASKETS The head gasket we recommend for our 23deg. heads used on 327 / 350 / 383 / 400 SBC engines without steam holes is Felpro # 1003. On engines using the GM 400 block, or aftermarket blocks with steam holes, use Speedmaster # SM5213 or Felpro # 1014.
INTAKE GASKETS Our heads are manufactured with both the conventional intake manifold bolt pattern, and the Vortec bolt pattern. If you’ re installing a Vortec manifold, use Felpro # 1255 gaskets. If you are using a convential intake manifold, use Speedmaster # SM3283 or Felpro # 1266 gaskets.
PUSH RODS Our aluminum 23deg. heads typically use +. 100”( longer than stock) pushrods, Depending on the components used, it is possible that you may need pushrods shorter or longer than that so we recommend that you use an adjustable pushrod to dial in your rocker geometry and order pushrods to match.
SPARK PLUGS All Speedmaster 23deg. SBC heads use standard 14mm. x 750” reach, 5 / 8 hex, gasket seat sparkplugs like NGK R5671A-7, Autolite 3924, Champion RC12YC, etc. Remember that higher compression / boost require a colder heat range sparkplug.
HEAD BOLTS / STUDS Our 23 degree heads utilize standard head bolts or studs. Our part number for head bolts is SM2451-BOLT, and the head studs are SM2451. For the 15 degree heads, we recommend SM2451-15DEG. headstud kit with 3 / 8” reduced shank on the studs between intake ports. The ARP head bolt part number is 134-3601, and ARP head studs 234-4301 for the 23 degree heads. ARP also makes a head stud kit that is compatible with our 15deg. heads on cast iron blocks with part number 234-4723.
EXHAUST GASKETS We recomend the use of our Exhaust gaskets # SM5120 or Fel-Pro # 1405 on our 23 degree heads. On our 15 degree heads, use SM5121 or Fel-Pro # 1409.
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