Using 400 SBC cylinder heads on a 305 engine
M&M CUSTOM (Talk | contribs) (Adding detailed information pertaining to this subject.) |
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YES you can. | YES you can. | ||
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| + | All first and second generation Chevrolet 262 through 400 CID small block engines use the same head bolt pattern, and as a result all heads are able to be bolted on any other engine in this group, although not recommended in some applications (such as swapping out a set of 64cc heads for 76cc heads- which will significantly reduce the compression ratio). | ||
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| + | The main difference in any 400 cid small block head compared to any other small block head is the "steam holes" between the combustion chambers, due to the 400 block having siamesed cylinders (meaning they are physically connected to each other due to the bore size being as large as it is and the design being a part of the structure necessary for durability of the engine block) and the usual coolant passages not having the normal small block engine designed flow charactaristics. | ||
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| + | The 400 heads with the steam holes can be physically bolted to other blocks without problem, and non-400 heads can be properly installed on the 400 block by simply laying a correct 400 head gasket with steam holes on the head and drilling the steam holes in the non-400 head, this is best done using a fabricated jig on a drill press to keep the head-to-engine mating surface at a 90 degree angle to the drill bit.--[[User:M&M CUSTOM|M&M CUSTOM]] 05:47, 6 February 2009 (PST) | ||
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| + | A good editorial with pictures can be found here. [http://www.gregsengine.com/350to400.htm] | ||
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