Bonneville America Forums Forums Technical Forums Performance Mods 1200 cc Wiseco big bore kit sited

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Yes the case has to be bored, as does the 1100cc kit to fit the larger pistons. And both kits will also need a Jojje made aluminum head, because the stock head isn't big enough for the 101mm pistons. That'll cost you about $500.

The 1100cc is recommended over the 1200cc stroker, because of streetability issues, and costs for the stroker crank(very expensive). You'll also want to get your crankshaft dynamically balanced, which also allows you to elminate the 8 lbs of counter balancers. And although Wiseco says you don't need Carillo/forged rods, it's suggested you get them.

I got all this info off of this Delphi forum where Bill Gately, owner of Bonneville Performance and the developer of all the Wiseco big bore kits, posts info and dyno runs, and will answer questions. If you're even thinking about putting in a Wiseco big bore kit, I highly recommend you join that Delphi forum.

Btw, here's a shot of the pistons. From left to right; 68mm, 92mm, 101mm, 101mm stroker.

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