7 or 5 heads?
#1
7 or 5 heads?
I am reading that 5 heads flow better compared to the rest of heads...
what is the truth? 7 heads have larger valves.
what head suit better the 403 application with a stock short block engine.
which head is better?
Nic
what is the truth? 7 heads have larger valves.
what head suit better the 403 application with a stock short block engine.
which head is better?
Nic
#2
![Smile](https://classicoldsmobile.com/forums/images/icons/icon7.gif)
Best head for a 403 is an aftermarket aluminum one.
Jmo
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December 7th, 2020 06:43 AM