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SMALL BLOCK CHEVY CYLINDER HEADS
All Speedmaster 23deg. Small Block Chevy heads are available with Straight or Angled sparkplugs. Standard valve sizes are 2.020” Intake, and 1.60” Exhaust, both +. 100” length. While the 2.02” valves are standard issue, all of our 23deg. aluminum heads can accept a 2.05” intake valve with minimal additional work. Some of our CNC ported heads( SM3010) are designed around 2.05” Intake valves. Our cast iron heads use 1.94” intake valves, and 1.50” exhaust valves. For those racers looking for a head with 800 + hp potential, step up to our new 15deg heads! These heads have room for huge 2.180”- 2.200” intake valves. We even have the matching rockers!
Speedmaster CNC ported cylinder heads are machined on dedicated 4-axis and 5-axis CNC machining centers to ensure accuracy and cost effectiveness.
Combustion Chamber, Exhaust and Intake Ports all fully CNC machined for better flow. CNC combustion chambers offer superior control over flame travel and quench area. CNC Ported heads eliminate human error and variation from port to port. Unsurpassed repeatability from one cylinder head to another that is commonly found in“ Hand porting & Polishing”
Combustion chambers are exact in volume- so every cylinder has the same compression ratio. Each port is the same cross section- so every cylinder can reach higher true RPM potential. CNC machining produces ports and chambers to within tolerances of no more than. 002”; in turn every cylinder can reach the same power potential and accurate tuning.
FINISHED PN #’ S
SM3002A SM3002A-68 SM3002A-74 SM3002S SM3002S-68 SM3002S-74 SM3003A-59 SM3003A SM3003A-68 SM3003A-70 SM3003A-74 SM3003A-59 SM3003S SM3003S-68 SM3003S-70 SM3003S-74 SM3009A-68 SM3009A-68VJ SM3009A-70 SM3009A-70VJ SM3009A-74 SM3009A-74VJ SM3009S-68 SM3009S-68VJ SM3009S-70 SM3009S-70VJ SM3009S-74 SM3009S-74VJ SM3010A-64 SM3010A-64VJ SM3010A-70 SM3010A-70VJ SM3010A-74 SM3010A-74VJ SM3010S-64 SM3010S-64VJ SM3010S-70 SM3010S-70VJ SM3010S-74 SM3010S-74-VJ SM3020 SM3020CNC SM3101A SM3101S
VALVE ANGLE
23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 23 deg. 15 deg. 15 deg. 23 deg. 23 deg.
VALVE SIZES
2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.02” / 1.60” 2.05” / 1.60” 2.05” / 1.60” 2.05” / 1.60” 2.05” / 1.60” 2.05” / 1.60” 2.05” / 1.60” 2.05” / 1.60” 2.05” / 1.60” 2.05” / 1.60” 2.05” / 1.60” 2.05” / 1.60” 2.05” / 1.60” 2.150” / 1.60” 2.180” / 1.60” 1.940” / 1.60” 1.940” / 1.60”
INT. VOL.
190cc 190cc 190cc 190cc 190cc 190cc 205cc 205cc 205cc 205cc 205cc 205cc 205cc 205cc 205cc 205cc 217cc 217cc 217cc 217cc 217cc 217cc 217cc 217cc 217cc 217cc 217cc 217cc 215cc 215cc 215cc 215cc 215cc 215cc 215cc 215cc 215cc 215cc 215cc 215cc 230cc 285cc 190cc 175cc
CHAMBER VOLUME
64cc 68cc 74cc 64cc 68cc 74cc 59cc 64cc 68cc 70cc 74cc 59cc 64cc 68cc 70cc 74cc 68cc 68cc 70cc 70cc 74cc 74cc 68cc 68cc 70cc 70cc 74cc 74cc 64cc 64cc 70cc 70cc 74cc 74cc 64cc 64cc 70cc 70cc 74cc 74cc 61cc 61cc 64cc 59cc
COMP. VALVE JOB
NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO NO YES NO YES NO YES NO YES NO YES NO YES NO YES NO YES NO YES NO YES NO YES NO YES NO NO NO NO
CHAMBER FINISH
As Cast CNC CNC As Cast CNC CNC CNC As Cast CNC CNC CNC CNC As Cast CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC As Cast As Cast
PORT FINISH
As Cast As Cast As Cast As Cast As Cast As Cast As Cast As Cast As Cast As Cast As Cast As Cast As Cast As Cast As Cast As Cast CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC CNC As Cast CNC As Cast As Cast
CASTING MATERIAL
Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Alum. Iron. Iron.
Flow Results Speedmaster # SM3002S
These Flow Numbers are un-ported Intake Valve 2.020” Exhaust Valve 1.600” LIFT INTAKE EXHAUST
0.100 |
58.0 |
52.0 |
0.200 |
113.5 |
97 |
0.300 |
159.2 |
132.8 |
0.400 |
199.7 |
162.0 |
0.500 |
227.6 |
179.8 |
0.600 |
244.2 |
187.7 |
0.700 |
248.3 |
191.0 |
|
Intake Port: 190cc Exhaust Port: 72cc Combustion Chamber: 64cc |
|
Flow Results Speedmaster # SM3003A
These Flow Numbers are un-ported Intake Valve 2.020” Exhaust Valve 1.600” LIFT INTAKE EXHAUST
0.100 |
63.0 |
52.2 |
0.200 |
117.1 |
97.8 |
0.300 |
163.1 |
132.9 |
0.400 |
203.5 |
161.9 |
0.500 |
230.3 |
180.0 |
0.600 |
248.2 |
189.2 |
0.700 |
252.2 |
192.1 |
|
Intake Port: 205cc Exhaust Port: 72cc Combustion Chamber: 64cc |
|
Flow Results Speedmaster # SM3009A-68
These Flow Numbers are CNC ported Intake Valve 2.020” Exhaust Valve 1.600” LIFT INTAKE EXHAUST
0.100 |
67.9 |
52.1 |
0.200 |
42.2 |
110.8 |
0.300 |
193.6 |
160.2 |
0.400 |
238.9 |
197.7 |
0.500 |
272.7 |
223.9 |
0.600 |
295.1 |
235.8 |
0.700 |
299.1 |
240.4 |
|
Intake Port: 217cc Exhaust Port: 78cc Combustion Chamber: 68cc |
|
Flow Results Speedmaster # SM3010A-64
These Flow Numbers are CNC ported Intake Valve 2.055” Exhaust Valve 1.600” LIFT INTAKE EXHAUST
0.100 |
66.1 |
52.1 |
0.200 |
143.1 |
101.6 |
0.300 |
202.5 |
150.9 |
0.400 |
245.1 |
196.4 |
0.500 |
276.8 |
215.7 |
0.600 |
296.8 |
225.8 |
0.700 |
305.3 |
231.5 |
|
Intake Port: 212cc Exhaust Port: 76cc Combustion Chamber: 64cc |
|
Flow Results Speedmaster # SM3020CNC SBC 15 degree head These Flow Numbers are CNC ported Intake Valve 2.180” w / Sunnen VCS6090 cutter Exhaust Valve 1.600” w / Goodson FT05B cutter LIFT INTAKE EXHAUST
0.100 |
73.6 |
51.8 |
0.200 |
162.8 |
105.7 |
0.300 |
223.5 |
159.2 |
0.400 |
272.5 |
210.7 |
0.500 |
316.6 |
245.1 |
0.600 |
345.4 |
258.0 |
0.700 |
363.3 |
264.3 |
0.800 |
373.2 |
268.0 |
Intake Port: 283cc Exhaust Port: 92cc Combustion Chamber: 61cc
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