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Re: 400/406 Builds
With flat top pistons and a small chamber head such as the 'camel humps' I believe you are going to be closer to 11-1. This is too high to run pump gas especially with a mild cam and the less efficient combustion chamber of those heads. With those pistons you will need a head with a combustion chamber of around 72-76cc. You will also want to choose a cam with a intake valve closing point that will help create a streetable dynamic compression.
Sorry to say but those AFR 227 heads are way too big for street use. The low and mid range power is going to suffer. I would recommend a head with a intake size of 190-195cc. Depending on what you want a 180cc head would likely be just fine.
Changing the Vic Jr for a Performer RPM air gap as well as upgrading to a roller cam is a good decision.
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