Rebuilt 302 casting heads available through Rockauto

66jim said

302 heads require less timing which is their biggest advantage. Back when they first appeared where advertised as 'fast burn' similar to Chevy Vortec.

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They have the same size ports as any 318 head. There is no difference between them other than the closed chamber...and that aside from raising the compression a tad will only benefit you if the piston is close enough .050-.030 from the closed side of the chamber to achieve quench effect.

I'd use them to raise the comp or incorporate quench. I have a set sitting on the shelf for probably 12 yrs. I measured the chambers at 64cc. They are stock and in great shape. 124 cc int runner.
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They take a lot of work to make them into a 360 head. The runners are not quite as tall so the volume is never really the same as a full ported 360 which falls around 185-190cc max. Can't really get then any bigger without then being paper thin and crack prone. The 302,675,310 when flowing 200cfm ime the int port volumes are about 132-135cc and anything flowing more than 205cfm..usually is easier with a 1.88 valve and therefore ex. 220cfm =138-140cc int port. I'll add that some of the early closed chamber 273 heads are 66-67 cc from the factory.