1975 ( Grand National Engine ) details

Here’s reference to square port W-2’s. From other paperwork they were having foundry issues with them and that might have killed them being available to public. Not sure if any survived to actually race.

I cant find my other reference to W-2-1/2 and W-3. Not sure if this “square port W-2” is also called a W-2 1/2.

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