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Old 03-26-2011, 02:04 PM
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Old topic new spin

Ok, so I'm a new member to this website, but i've been reading your forums for some time now. One topic that has always intrigued me is the old 305-334 Stroker motor. I'm very interested in this project and plan on doing it to my 92 camaro RS.........However, today's question is this.... from what i know about engines, and from what i gather from the forum is that a 305 and a 350 are exactly the same engine blocks, with the exception of the bore sizes and smaller heads, the blocks are the same size. So when people mention boring out a 305 to a 334, or just buying a 350 and boring it out to 383, why cant you just bore out the 305 to the 350 bore size or 383?

More simply, If the blocks are the same, then there should be the appropriate amount of space between the cylinders to go more than a .030 bore due to a 305 being the same black just smaller bore to begin with. So why cant a 305 be bored out more than .060 over to create a 350 or 383?

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Old 03-26-2011, 03:35 PM
richard stewart 3rd's Avatar
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Welcome to Hotrodders.com Glad to have you with us

When the 305 block was pored it had a 3.75" bore/hole with a wall thickness of lets say .060 before hitting water

where the 350 started with a 4" bore/hole

So if you only have .060 before hitting water, you can only remove .030 that will add about 5CID. And you just can't get there from here.
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Old 03-26-2011, 04:47 PM
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305 and 350 are not the "same" block, just share most all bolt patterns, external size, and dimensions. The 305 block has a smaller cylinder barrel core in the casting, there is no way you can bore that small 305 3.746" cylinder to even stock 350 4.000" bore size. You will hit water jalket long before you get there. you can't even bore it to stock 283/307 3.875" bore size.

While the 334 seems like a lot of fun on paper, it's only real use is if you are mandated by emissions laws to retain the stock 305 block. The biggest problem is the small bore size of the 305 limits how big a head you can put on it, which limits power. A 350 will do everything better than the 305 stroked to 334, and cost about 1/3-1/2 less to build.
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