That is the location for the road draft tube and possibly the optional
PCV system. I have never actually seen in person an original V-8 pcv
system, but I don't think it used a rubber grommet. Most of the early
systems were hard piped. I do know that the 55 car shop manual shows a
PCV valve that is threaded on both ends.
Probably what you have is a later add-on. I did this to a 265 years ago.
I took a freeze plug and drilled it so that a late model grommet fit in
the center, then removed the road draft tube and drove the freeze plug
into the hole. i worked very well.
The thing to remember is that PCV is NOT a pollution control, Its
designed to reduce blowby condensing in the crankcase and diluting the
oil or causing corrosion. That's why it was Standard equipment on all
big GMC (series 400 & above) trucks from the 40's up.
--
John Dorsey
Wauchula, FL
'49 Chevy Panel http://www.strato.net/~jrdorsey/truck.htm
'52 GMC Firetruck http://www.strato.net/~jrdorsey/fire/fire.htm
'51 Chevy suburban http://www.strato.net/~jrdorsey/burb/
McGillis@aol.com wrote:
>
> My newly acquired '55 Cameo V8 seems to be missing a breather tube at the
> rear of the engine. It looks like a 1.5" diameter hole in the top of the
> block has a rubber doughnut in it with a .5" diameter hole. A PCV valve
> might fit nicely. Should a draft tube be there? I have read about a factory
> optional closed crankcase ventilation system, would it have used a PCV valve?
>
> Thanks,
>
> Dennis McGillis
> ('36 Lowcab pickup, '55 Cameo)
> 949-551-4821 phone
> 949-551-1162 fax
> 949-533-7211 cellular
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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