Date: Tue, 18 Dec 2012 13:54:20 -0800 (PST) From: Nick ALFANO<71amx@xxxxxxxxxxxxx> Frank, as for putting 4 bolt mains on a 360 and smaller engine, on a regular block it can't be done. They don't have the structural webbing across the mains that the 390 and 401s have. ======================================== It was obviously a 390/401 block that I've seen the 4-bolt cap in then. I wasn't sure if the smaller displacement blocks could have a 4-bolt main cap in them or not. I seem to recall the extra bolts were 3/8" instead of 1/2" like the factory main bolts, but I may be mistaken on that too. Thanks for clarifying! -- Frank Swygert Editor - American Motors Cars Magazine www.amc-mag.com _______________________________________________ AMC-list mailing list AMC-list@xxxxxxxxxxxxxxxxx http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com