If you go with one of the big name Pontiac Builders, such as Spotts, Butler, Pacific etc, to buy a stroker kit, they will put it together based on your what you want to end up with and your specific engine. They will ask questions like what is your deck height after milling? What compression ratio do you want to end up with? What heads are you using? Are they going to be milled and/or street ported? You will need to use a longer rod and a shorter height piston. Rods for a 4.250 crank would be 6.800 and are readily available. Pistons will have to be custom made anyway so they will order them based on what you want to end up with. Plus they are willing to provide phone support and answer questions. I would not recommend buying the parts piecemeal on your own. JMHO Jim
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