[DML] Re: B280 heads on B28 engine

[wingd2@xxxxxxx]

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


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