the same books went into great detail describing the proper way to notch the bore so that a 273 could then be able to accept 340 heads. Many years later I found out, you can just bolt them on, "factory book" be damned. .
roycrown, is this true? Have you actually done this? Tell me more. I know this post is about 4 barrels on 318's but I have never heard of anyone doing this before w/o a notch. pm me if you need to.