Re: [FWDLK] INTERCHANGEABLE HEADS AND INTAKE MANIFOLD

[Dave Homstad <dhomstad@xxxxxxxxxxx>]

All Dodge Hemi heads will fit on all 55 - 58 Dodge Poly engines, and when those engines are installed in a 55 - early 56 Plymouth. Some considerations: 
1. Dodge 315/325 Poly engines had relocated pushrod holes in the block, requiring a boss cast toward the engine center at the head/block interface. This may not seal with Hemi heads on a tall Poly block. No problem with the short stroke blocks. 
2. The location of valve notches in the pistons are different. May not be a problem for lower compressions and stock cams. 
3. All stock cams are wimpy. To take advantage of the improved Hemi heads will require a reground cam with additional lift and duration. 
4. Only Hemi exhaust manifolds fit Hemi heads. Poly exhaust manifolds are totally different. 
5. Hemis used different length pushods. 

Dave Homstad 
56 Dodge D500

---- Archangel1390@xxxxxxx wrote: 
> 
> 
> If the 55 Plymouth 260 and the Dodge  270 poly engines are interchangeable, 
> then does that mean the 55 and 56  Plymouth's with the 270 poly engines 
> could use the Dodge Hemi heads if they  changed the intake and exhaust 
> manifolds.
>  Will the 55, 56 Dodge Hemi heads fit anything  else?
>  
>         Ron
> 
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