In a message dated 3/31/2004 brobertson@xxxxxxxxxxxx writes: From: "content22207" <brobertson@xxxxxxxxxxxx> Subject: Re: B280 heads on B28 engine "---Problem: B280/Chrysler/Renault 3.0 is even fire. Valve timing will be totally off. Besides, I don't think intake ports on those heads mate up to our manifolds. Cylinder diameters should be the same however (displacement is the same, rounded up by Chrysler/Renault for marketing purposes). Are timing chain sprockets interchangeable?---" Bob, The heads from either engine have nothing to do with the valve timing. It's the camshafts that control valve timing. And the camshafts from either engine will fit either set of heads, so you could take the B280 heads and put them on a B28 engine by using the B28 cams. The cam bearing bores and centers and all the valve locations and rocker arm spacing is the same and the parts will swap from one head to the other. The timing chain sprockets will also interchange. You are correct, the intake ports are different between the two sets of heads, and the intake manifolds cannot be swapped. So a B28 intake will not directly work on B280 heads. A few other problems with this head swap are - the cylinder diameters ARE different between the two blocks, both ID bore and OD sleeve size, so gaskets and mating/sealing surfaces are different. The B280 heads have bigger combustion chambers, which will lower the compression ratio if installed on the B28 engine. The B280 heads also are not machined to accept the ignition distributor from the B28 engine nor are they machined to accept fuel injector nozzles from the K-jet system. The head bolt pattern is the same, along with the valve cover and timing cover bolt patterns. The exhaust ports are also the same bolt pattern. So you could physically bolt a set of B280 heads onto a B28 block, but installing B280 heads on a B28 engine will not, in itself, give any performance gains. Just a lot of work to have something "different." Marty [Non-text portions of this message have been removed] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/