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#21
January 31st, 2016, 11:44 PM
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Re: 1967 gmc
I can't see why they wouldn't have. Replacing a 305 in a pickup to a larger 351C upon request from a dealer was not to uncommon during that era. GMC did promote repowering all brands of trucks with their V6 engines including their own older trucks, dealers were set up to do conversions.
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#22
February 4th, 2016, 02:47 AM
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Re: 1967 gmc
Could I plug that hose if I run a breather on the valve cover?
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#23
February 4th, 2016, 04:32 AM
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Re: 1967 gmc
Your 67 has a closed positive ventilation system, plugging the hose is not a good idea you may build up too much pressure in the crancase system and the valve cover breather without a tube that runs to the air cleaner will not be adequate. It's not that difficult to come up with an attachment to the air cleaner. My 68 does not have the tube that runs from the back breather, I use a K&N open air cleaner setup but I have retained the factory ventilation system which uses a breather cap with tube to the air cleaner, modifcations were relatively simple
 I will post a pic of the setup in another post.
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#24
February 4th, 2016, 04:51 AM
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Re: 1967 gmc
Guess I need to fix mine. lol Been running just an oil breather and that's about it.
__________________
"Excuse the rust I use my truck" 1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. 1964 Chevy C20 292/SM420 1966 Chevy C10 292 hotrod 6/TKO600 My youtube channel aka Military Chevy: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
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#25
February 4th, 2016, 05:51 AM
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Re: 1967 gmc
What you can do is update it to the 68-74 style valve cover breather with tube, eliminate the rear breather/filter and just cap it off with an expansion plug. I'll post a pic of my 68 setup tomorrow when I get home.
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#26
February 5th, 2016, 07:51 AM
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Re: 1967 gmc
What type of motor oil do you guys like in the 305?
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#27
February 6th, 2016, 02:47 AM
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Re: 1967 gmc
Quote:
__________________
"Excuse the rust I use my truck" 1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. 1964 Chevy C20 292/SM420 1966 Chevy C10 292 hotrod 6/TKO600 My youtube channel aka Military Chevy: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
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#28
February 6th, 2016, 03:36 AM
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Re: 1967 gmc
I too am running 15W-40 in my 478M but using Rotella oil which already has zinc in it
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#30
February 6th, 2016, 08:47 AM
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Re: 1967 gmc
Quote:
__________________
Ed Snyder Medford, Oregon 1962 1000 Pickup 401M & Muncie 318 with overdrive 1962 K1000 Suburban 401M & SM420 1965 2500 Suburban 351C & SM420 with Watson overdrive 1967 CM1500 pickup 351E & NP435
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