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compression change

78freewheeler

78freewheeler

117
2
alabama
Ok I have finally talked myself into gettin some aussie heads. My question is how much will my compression change and will I have to run octane boosters or premium fuel. I have sealed power 8.5to1 pistons right now. Another question is is will adding these heads affect my torque curve to where I'm gonna have to turn it up more to get that added power and how much of a gain should I expect to see from this
 
UNRULEE

UNRULEE

^LARGE carbon footprint^
5,412
424
Coal Country, ND
^^^^^^^^^^^^^what he said^^^^^^^^^^^^^^
 
Bax

Bax

149
3
Fl.
The aussie heads will make better torque / power at the same RPM so you will not have to turn the engine harder. They are closed chambered so your compression will be raised. You will need most likely need to go to premium fuel. Without fuel injection / timing control it is hard to stop the pinging with anything over 9.5 to 1 compression ratio. Unless you work on the quench some but that is new pistons. Tim Meyer is a great source for these heads. Your performance gain will be noticeable.
 
money_pit

money_pit

84
0
You will be better off with your stock heads. With those dished pistons that are likely a lot more than .030 in the hole, you will just be chacing your tail around with detonation.
 

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