View Full Version : compatible aussie roo 10-02-2007, 06:18 AM Gday,Can anybody tell me if 1970 455 heads are compatible with a 1967 400 block and also do they function from idle to a performance level without radical engine mods Thanks Aussie roo Troys69GS 10-02-2007, 06:22 AM If they have the stock valves in them then you should have no problem. You will want to doulble check the cylinder diameter and the valve width measurement just in case you get odd heads that may have the bigger valves in them. bob k. mando 10-02-2007, 04:28 PM just in case you get odd heads that may have the bigger valves in them by which, Troy means "Stage 1" heads. just so you know that, if you have them, you aren't exactly stuck with a pair of sows ears. they just likely won't be the best performers for you due to the valves being shrouded by the narrow diameter bores of the 400. time to upgrade to a Tomahawk! :bgrin: ( check out page 23 of the catalog ) http://taperformance.com/PAGES%20PDF/2007_D2_WEB.pdf |