So I'll cut to the chase. I'm currently building an olds 403 and am debating on what cylinder heads to use. The heads are either olds #7 heads or the edlebrock performer heads. With the performers running what I believe to be a 77cc chamber the compression ratio will be a little over 10:1. The #7 heads will take it to what I'd imagine to be around or over 11:1. If the numbers I'm throwing out there are a little high it's because I've got the mondello flat topped pistons which obviously raise the compression ratio. Now I know that the #7 heads will take machining to work but will be significantly cheaper in my case as well as porting and polishing seems to be cheaper. I know that the performers have bigger valves but is it worth opting to smaller chambers? I guess what I'm looking for is a direct shootout answer pertaining to number 7 heads vs edlebrock performer heads. As always thank you for your time and input!
Cylinder heads and compression ratio help needed.
- Thread starter Solidhank
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Edelbrock RPM or Procomp heads are what you want. The Procomp heads have chamber size similar to the orginal 4A heads out of box. What size cam do you have? 11 to 1 with iron heads is way too high for pump gas.
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