| Re: Building a boost friendly 400 |
Subject: Re: Building a boost friendly 400 by PeteK on 2013/11/14 23:07:53 There are 3 issues on a stock 400 block that contribute to the heat issue, in my opinion. The cylinder walls are siamesed, so coolant flow is slightly restricted (restricted may be the wrong word, but close enough). Connecting rods are approx. 1/4 inch shorter than other small blocks, so the side loading on the cylinder wall was greater. All production 400's had crappy iron heads. In a performance build, the rod used is normally 6 inch, so that brings the side loading in line with a stock 350. One thing is certain. If building a 400 or so cube small block and boosting it to the 700 hp level, heat will be an issue that will need mitigation. The siamesed cylinders (in my opinion) are such a tiny portion of the equation, that is not worth thinking about. |
