New to the Group

[JCHef]

Good morning all. Bought my 65 GMC from a family friend in NM and hauled here to CA. I was surprised to find how rare the V6 305 was and wow are the parts few and far between. So far we have cleaned the fuel lines and tank, replaced all the rubber fuel hoses. Changed the oil and filter and put a new battery in. Fired right up! There is some fuel seeping from the carb and fuel pump as well as fuel spitting from the vent hole. I'd like to go slow and fix things that we find wrong along the way. Eventually get it as close to full restore as possible. Love the fact it has a 4 speed manual trans, can't wait to tech the wife to drive it.

[Funky61]

Welcome to the Forum JCHef!

Nice looking fenderside you have and glad to hear you will keep the V6!



More photos when you are able

[Ed Snyder]

Originally Posted by JCHef

Good morning all. Bought my 65 GMC from a family friend in NM and hauled here to CA. I was surprised to find how rare the V6 305 was and wow are the parts few and far between. I'd like to go slow and fix things that we find wrong along the way.

I'd like to "second" Funky's comments. We're all glad you're keeping the V6. Way too many V6s get pulled, scrapped, and replaced with small block Chevy engines. Many parts for the V6 are easier to find than you might think. If you get stumped looking for something in particular, just let us know.

Keep us informed on your progress!

[jmfurgason]

What is opinion of Castrol GTX 10w30 conventional oil for use in 1963 305E ?/ Thanks JM

[tbucketnut]

Welcome aboard, the help and people here are first class.
Jm, I recently did some research on oil and have found I like and use Shell Rotella T4 --10W30 is ok. I like the T4 because it has enough zinc in it. Oils for the most part are devoid of zinc these days because most camshafts have a roller follower, as you know the GMC mighty V6 has a flat tappet mechanical cam so zinc is what you are required to have to sustain good long life in the camshaft arena. One could argue that it is sufficient with having just the cam in a constant oil bath like this engine has but for 16 bucks a gallon for the T4 why risk it. I would stay with dino oil and away from synthetics unless you have new seals. My humble opinion only.
You could also stay with your favorite brand and buy a zinc oil additive too, you have options.

Steve

[LEWISMATKIN]

I know this goes against the recomendations of most, but unless you live in a cold climate for at least 6 months of the year, I recommend a single weight series 3 diesel engine oil preferably SAE 40 for several reasons. Zinc content, which has previously mentioned, is one. Second, I recommend single weight oils for the reason that a single weight oil gives more cushion than a "mulit-viscosity" engine oil. Engine oils do not get thicker when the oil temprature rises. If you want to see what your multi-viscosity oil looks like at 200 deg. F., mix one quart of your oil with one quart K-1 Kerosene. That oil is super thin, and has no cushion. Years ago, a Standard Oil distributor (now called Chevron) told me what the mulit-viscosity rating means. The first number (using 10w-30 as an example) is the base of the oil. In a 10w-30 oil, the 10w is a SAE10 winter grade oil (approx SAE 8) with the additive package that gives the oil the surface tension of a SAE 30 oil without the body or cushion of the SAE 30 oil. Our V6 engines came from the factory with more verticle oil clearance than the typical passenger car engine. As a dealer fix for the "covey of quails" noise upon initial start up, my dad would install .002 U.S. rod bearings in a customer's engine to stop the noise created by the verticle oil clearance of the connecting rod bearings. In giving my reasoning, I only seek to ensure the longevity and protection of the bearings and other moving parts of these engines.

cordially,
Lewis Ellis Matkin, Jr.
Ridge Manor, Florida 33523
1965 1002 GMC V6-305E (soon to be 401M)

[LEWISMATKIN]

Originally Posted by JCHef

Good morning all. Bought my 65 GMC from a family friend in NM and hauled here to CA. I was surprised to find how rare the V6 305 was and wow are the parts few and far between. So far we have cleaned the fuel lines and tank, replaced all the rubber fuel hoses. Changed the oil and filter and put a new battery in. Fired right up! There is some fuel seeping from the carb and fuel pump as well as fuel spitting from the vent hole. I'd like to go slow and fix things that we find wrong along the way. Eventually get it as close to full restore as possible. Love the fact it has a 4 speed manual trans, can't wait to tech the wife to drive it.

I also welcome you tho the group!!!

[jmfurgason]

Great forum, much needed info,any one know if Castrol GTX 10w30 conventional has adequate ZINC ? this oil was highly recommended, however this is my 1st change 1963 GMC 305E 1000

[LEWISMATKIN]

Originally Posted by jmfurgason

Great forum, much needed info,any one know if Castrol GTX 10w30 conventional has adequate ZINC ? this oil was highly recommended, however this is my 1st change 1963 GMC 305E 1000

probably not. If you use this or any other modern oil, you will have to add a zddp zinc additive with every oil change. Lucas oil company has a great one.

[jmfurgason]

Thanks , wont be using Castrol GTX , cant locate dino 20w ?? will use Shell rotella. suggestions for sm420 and rear end ?? jm