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HOLDEN 304- 308 PERFORMANCE ALUMINUM CYLINDER HEADS
The Speedmaster V8 Holden VN cylinder head is a definite step above the rest. We utilize high flow ports and larger diameter hardened seats that offer improved flow and increased longevity when used with today’ s low lead fuels. Not only do you get more performance out of the box than OEM heads, our heads are significantly lighter since they are made of“ Gravity Die Cast” Aluminum. There is absolutely no reason to rebuild your set of OEM castings when you can use a higher flowing, lighter, more detonation resistant cylinder head. You won’ t find a head that offers better value. Period.
Finished PN #’ s
SM3071 SM3072
Valve Sizes
2.02”/ 1.60” 2.02”/ 1.60”
Int. Vol.
195cc. 205cc.
Chamber Volume
64cc. 68cc.
Comp. valvejob
No Yes
Port Finish
As Cast CNC
Chamber Finish
As Cast CNC
Flow Results Speedmaster # SM3071 These Flow Numbers are as Cast Intake Valve- 2.02” Exhaust Valve- 1.60”
LIFT INTAKE EXHAUST
0.100 |
69.3 |
46.0 |
0.200 |
126.6 |
99.2 |
0.300 |
177.0 |
131.3 |
0.400 |
210.2 |
149.3 |
0.500 |
226.1 |
160.9 |
0.600 |
232.4 |
167.5 |
0.700 |
236.1 |
171.7 |
0.800 |
237.5 |
172.9 |
Intake Port: 195cc Combustion Chamber: 64cc
Flow Results Speedmaster # SM3072 These Flow Numbers are CNC Ported Intake Valve- 2.02” Exhaust Valve- 1.60”
LIFT INTAKE EXHAUST
0.100 |
69.3 |
46.0 |
0.200 |
126.6 |
99.2 |
0.300 |
177.0 |
131.3 |
0.400 |
210.2 |
149.3 |
0.500 |
226.1 |
160.9 |
0.600 |
232.4 |
167.5 |
0.700 |
236.1 |
171.7 |
0.800 |
237.5 |
172.9 |
Intake Port: 205cc Combustion Chamber: 66cc
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