Re: 1964 GMC "crustine" semi-build.
Quote:
If this is a 305e it should not have a pvc valve. Should be closed caps. The crank case takes air in though the breather at the back of block and vents through check valves in cylinder.
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Through its years of production, the hole behind the left cylinder head of the V6 transitioned from a road draft tube to a filter canister to a casting plug. You're describing the "middle aged" V6.
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Ed Snyder
Medford, Oregon
1962 1000 Pickup 401M & Muncie 318 with overdrive
1962 K1000 Suburban 401M & SM420
1967 CM1500 pickup 351E & NP435
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