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View Poll Results: To swap or not to swap? | |||
Keep plugging along... |
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2 | 25.00% |
Swap that thing out! |
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6 | 75.00% |
Voters: 8. You may not vote on this poll |
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#1 |
Registered User
Join Date: Jun 2024
Location: Phoenix,AZ
Posts: 36
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Ok, I'm having straight forward decision making "funk" for lack of a better term. I need you all to help. Not so short back story: I've got a 1971 GMC K2500/flatbed, with a 350/ TH350/ NP205, Dana 70 dually rear-end, Dana 44 front 4.10 gears( Un-confirmed, that is what the "tag" on both axles says). I've already done a complete tune up(plugs, wires, cap, rotor, new HEI innerds, including weights and springs) rebuilt the Edelbrock 1406 that came with it and completely rebuilt the fuel system(tank, sending unit, fuel filter, fuel pump, fuel line to the carb) I've also replaced the starter and flex plate (both were missing teeth).I've also replaced mounts/lights/ and other aesthetic parts. .. At this point I'm getting frustrated... It will not time correctly or run smooth. I've tried finding TDC using a piston stop and it is way off(yes I rotated it by hand both directions and then found the middle) it will not stay "timed" I set it 12 dgrs advanced, shut of the truck, come back 10 mins later and it is "out" by 2 dgrs(either direction). There is also noticeable slop when turning the crank by hand to when the rotor actually starts turning. This to me tells me my chain/gears are toast and at some point I've developed a tick/tap in the driver's side of the engine that sound suspiciously like a lifter/valve/rocker or similar on #7.
**At this point I'm at a cross-roads.** 1) Do I continue to patch this possibly original ( I think the heads were replaced at some point) 53 year old engine "because it runs"? OR 2) Swap in a Factory GM long block "TBI" 350 crate motor that has been sitting in the crate since 2017? Any and all advice is welcome/appreciated. |
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#2 |
Senior Member
![]() Join Date: Dec 2009
Location: TN.
Posts: 8,071
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Re: Mental help needed, please.
I would say swap it out.
You will be time and money ahead.
__________________
________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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#3 |
Registered User
Join Date: Jun 2024
Location: Phoenix,AZ
Posts: 36
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This is actually the direction I'm leaning. I feel like I just need more experienced opinions than my own... Or put another way, "I value others (with more experience in this type of matter) opinions."
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#4 |
Registered User
Join Date: Aug 2020
Location: Jasper GA
Posts: 15
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Re: Mental help needed, please.
Swap it and get it on the road to enjoy. If it is the original engine you will still have it and you can take your time tearing it down and really seeing what you have.
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#5 |
Registered User
Join Date: Jun 2024
Location: Phoenix,AZ
Posts: 36
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Re: Mental help needed, please.
Valid point, thank you. I could tear it down and take my time rebuilding it the way I want for long term replacement... My wife is gonna laugh at me... I swore "no leftovers"
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#6 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,595
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Re: Mental help needed, please.
Tell us more about this tbi crate motor.
What’s the specs on it? I’d keep plugging along. You’ve got a running motor to learn stuff from. |
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#7 |
Registered User
Join Date: Oct 2016
Location: Dallas Texas
Posts: 3,078
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Re: Mental help needed, please.
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Crate motor. -Kevin
__________________
67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
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