Thread: 305 vs 307 (whats the main difference?)

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You must have missed the first paragraph of my last post:

"Nova, be aware though, that nobody does this because of the cost of custom pistons with a 3.875" bore and a modified pin location to accomodate the additional stroke"

Using a 307 piston with the 350 crank will push the piston out of the bore by 0.115". Won't work with standard 307 pistons. You must spend big bucks to have Venolia, Ross or one of the other piston manufacturers make a custom piston with the pin location moved up 0.115" higher than the stock 307 pin location. It's not worth it for the modest gain. Drive the snot out of the 307 until it quits, then find a good small block 400 to rebuild and drop in.