Yup. Exhaust ports go out.
With that out of the way, check for the accessory mounting bosses for the AC
and alternator. They go on the front, and there are probably none on the
back of the heads.
Mark
> -----Original Message-----
> From: owner-gmcmotorhome
> [mailto

wner-gmcmotorhome]On Behalf Of Rob Teed
> Sent: Friday, February 05, 1999 7:45 PM
> To: Gmcmotorhome Org
> Subject: Re:GMC: Cylinder Heads
>
>
> I have a 455cid motor in my 74 GMC. I just had the heads redone. Getting
> ready to put them back on. Is there a Right and a left? I cant see a
> diffrence
> between the two.
> Thanks,
> Rob Teed 74 Painted Desert
>