So as far as i am aware a 305 has a 3.75" bore and a 3.48" stroke. My question to all you 305 hatin people out there is what is the absolute maximum safe stroke on one of these?

I have also heard that there are issues with getting cyl. heads that breath enough air for this thing to make power. Don't know about this and was curious.

I am only asking to confirm if I will eventually build one. I know, i know... "get a 350...," go ahead and say it. lol

 

I wouldn't stroke a 305 because the bore will shroud the valves, also, a stroker kit for a 305, last time I checked, costs more than one for a 350.

you could probably go to 3.75-3.875 with the stroke, but again, you would have poor breathing, and make less power, and cost more money.

 

actually, you can go to a 4" stroke, and a 3.796" bore, but that's it.

 

You can put a 400 crank into the 305 block and make a 334 but for the cost, it's not worth it with the small bore. You could build a simple 350 instead of a 334 and you would have a bigger engine. You can then take the 350 and stroke it to a 383.

Maximum stroke is limited to clearances. The rods need to clear the bottom of the block and also need to clear the camshaft and bottom of the cylinders.

Deck height is the same on all SBC blocks so the maximum stroke allowed is limited to all of them. The piston will always stop at the top of the cylinder but increasing the stroke means it needs to go farther down into the cylinder. There's only so much length in the cylinders for stroke without using exotic short skirt pistons and having the wrist pin up into the oil rings. When the piston is down in the cylinder, the crank counterweights need to clear the piston. Going to very long strokes means using very special parts so that everything clears.

Stick with the common 400 crank for a stroker. If you want to go longer, an aftermarket block is the best way to do it.