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#76 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
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#77 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
Some things I did for kicks:
Took some lift measurements for reference. Used 2 stroke fuel as starting fluid. Put 5 gal 50:1 ratio 2 stoke fuel in tank. |
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#78 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
When I went to hook up tach I noticed coil +/- hooked up opposite than I think it should be.
Coil polarity wrong for decades I guess; ran fine though. I connected coil "-" to distributor. Capacitor wire broke off; maybe something to do w/ radio interference. Don't know if cap difficult to find. |
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#79 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
Complete GMC 305E V6 solid lifter
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#80 |
Registered User
Join Date: Nov 2008
Location: Lacombe, LA
Posts: 2,772
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Re: 1966 GMC 305 V6 Service
Rufton,
I did not read through every post, but IF you have not made the following modification I would suggest it. Add the petronix ignition and get rid of the points and stuff. It will be the best $75.00 you spend, installs in less than 10 minutes. I did it and not regretted it. Jake
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http://s1299.photobucket.com/user/jb...23904108567829 |
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#81 | |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
Quote:
I've experimented w/ Pertronix. It is a fine ignition that allows you to keep OEM distributor cap ![]() I found no increase in mpg and couldn't detect smoother operation. One advantage of points is you can cheaply keep a spare in glove box. One advantage of Petronix is it maintains accuracy over 5000 rpm. My rule of thumb is to keep points in sub 5000 rpm and sub 5000 miles per year. |
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#82 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
Dropped the first run oil and I'm happy.
Have to look close to see any trash on element. I didn't find any large glitter. Couldn't feel any metal on rare earth magnet inside pan. Little trash inside canister unfiltered side but not bad at all . That 1/4" dot on bottom of canister is where I punched drain hole in effort to avoid mess. Ended up making a mess anyway ![]() |
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#83 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
Driving around I noticed I don't have to hold teeth just right to avoid clutch chatter. Both driver side mounts were loose before rebuild which explains chatter. The driver side trans mount dropped bolt which would have been an easy fix had I noticed. The engine mount rubber separated from metal which isn't obvious. The passenger mount was attached but loose.
I've weened 2 cycle oil to 100:1 ratio in fuel. Break in tip: Squirt valve train w/ oil during first few minutes; can't hurt but may help. |
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#84 |
Registered User
Join Date: Jan 2012
Location: Preston Idaho
Posts: 279
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Re: 1966 GMC 305 V6 Service
This picture reminds me of your rebuild
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#85 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
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#86 |
Registered User
Join Date: Feb 2013
Location: Boulder City NV
Posts: 214
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Re: 1966 GMC 305 V6 Service
I know it's kinda early but I am really curious what kind of mileage you are getting.
Are they really as bad as they say? Posted via Mobile Device |
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#87 | |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
Quote:
I expect initial readings to be low because not fully broken in. Guess I should road trip to get mpg data faster ![]() |
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#88 | |
Registered User
Join Date: Feb 2013
Location: Boulder City NV
Posts: 214
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Re: 1966 GMC 305 V6 Service
Quote:
A friend of mine had one of these and swears he got 7mpg no matter what. He also said it was geared to low for much hwy use. After looking at their low rpm torque curve I wonder if it is necessary to gear them that low? Posted via Mobile Device Posted via Mobile Device |
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#89 | |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
Quote:
305E loves 70+ mph cruise ![]() 3.07 dana 44 P235/75R 15 28.9" Stromberg WW 280 CFM 2bbl Main jets 0.055", 0.054" Poor compression high oil consumption 2" single exhaust pipe quiet muffler mix 8-9 mpg 70mph hwy 9-10mpg 2012 changes: Main jets 0.050", .050" 70mph hwy 11-12 mpg 2013 changes: Main jets 0.050", .050" 305E rebuilt Good compression Low oil consumption mpg to be determined |
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#90 | |
Registered User
Join Date: Feb 2013
Location: Boulder City NV
Posts: 214
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Re: 1966 GMC 305 V6 Service
Quote:
There is a really clean long bed knee knocker that has been sitting for at least 5 years that I am slowly convincing the owner to sell to me. I wanna like the V6, I really do... ![]() Posted via Mobile Device Posted via Mobile Device |
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#91 | |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
Quote:
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#92 | |
Registered User
Join Date: Jan 2012
Location: Preston Idaho
Posts: 279
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Re: 1966 GMC 305 V6 Service
Quote:
Last edited by raylube; 05-02-2013 at 11:17 PM. |
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#93 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
That truck used to have an "It's a Doozy" camper top that looked like that.
Functional but looks only a mother could love ![]() |
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#94 |
Registered User
Join Date: Feb 2013
Location: Boulder City NV
Posts: 214
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Re: 1966 GMC 305 V6 Service
I just reread this whole thing(again)...
...any updates? How's the mileage doing? Posted via Mobile Device |
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#95 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
Running great.
Only put 250 miles so far. Only getting 9 to 12 mpg. Has steering vib above 60 mph. Plan to address vib next. Then tune distributor. Maybe AFR and vacuum gauge in future. Maybe dual exhaust in the future. |
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#96 |
Registered User
Join Date: Feb 2013
Location: Boulder City NV
Posts: 214
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Re: 1966 GMC 305 V6 Service
Thanks again for taking the time to do this write up. It has been a big factor in finally buying the truck I mentioned earlier.
![]() I might be in the market for engine parts soon also if you have any leftovers? Posted via Mobile Device Posted via Mobile Device |
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#97 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
Your truck looks good; looks straight and solid from here.
Have spare short block but you probably don't need it. I was tempted to hoard some ebay and Rockauto parts but didn't. Wouldn't hurt to check hot lash, compression, plug color, head temp, etc. I glued gasket to vc and it's still leak free even though it's been removed a few times. |
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#98 | |
Registered User
Join Date: Feb 2013
Location: Boulder City NV
Posts: 214
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Re: 1966 GMC 305 V6 Service
Quote:
Posted via Mobile Device |
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#99 |
Registered User
Join Date: Nov 2011
Location: fayetteville nc
Posts: 10,338
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Re: 1966 GMC 305 V6 Service
Rufton....engine came out great
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1963 Short bed step side SBW 427 big block and borg warner T-16 HD 3 speed manual http://67-72chevytrucks.com/vboard/s...d.php?t=519869 1963 Short bed fleetside BBW 348 1st gen big block w/Powerglide http://67-72chevytrucks.com/vboard/s...d.php?t=619024 1964 Short bed trailer |
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#100 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: 1966 GMC 305 V6 Service
Thanks.
Unlike modern engines, 305E head remove/install is kinda fun (for gear head). I wouldn't run it a second before pulling head or using an inspection scope camera to have a look see. If very lucky you may retrieve through plug hole; then buy lotto ![]() |
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