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#1 |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
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305 to 350, what can i bring over?
will the harmonic balancer work?
also,i know i'll need a new flywheel, but will any th350 flywheel work with an 85' -below block and a th350c? |
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#2 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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Yes, your balancer will work, but you will need to use the 305 timing cover since the pointer is at 12:00. As long as the flexplate is from a 85 down engine, it will work. 86 up went to the one piece seal and was different bolt pattern.
Everything from the 305 will bolt on. But forget the heads, even though they will bolt on, the valves are too small and the chambers too small. Besides, a 305 head is the worst designed head GM ever made.
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Mike 1985 Chevy C-10 |
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#3 |
Registered User
Join Date: Dec 2002
Location: Hills of Western Mass
Posts: 626
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I would think that the 350 would need the bigger balancer to counteract the greater vibration from the larger rotating assembly.
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86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club! |
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#4 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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Personally, yes, I prefer an 8" balancer on 350's. But, it has nothing to do with vibration. If your engine vibrates, a balancer, or as the proper term goes, harmonic dampener, will not stop it. All the dampener does is like it says, dampen harmonics. It really doesn't matter what size, as long as it is used to balance the assembly.
I seriously doubt the assembly will be truely balanced anyway. Not for 700 bucks. A true balancing job is where they weigh each component to find the lightest one, and then remove weight off of the others to make them weigh the same. Every piston and rod needs to be weighed and matched. This is the only way to balance an internally balanced engine. Last edited by swervin ervin; 12-11-2003 at 05:36 PM. |
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#5 |
Account Suspended
Join Date: Oct 2002
Location: Elkhart, IN
Posts: 6,400
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why not spend the extra money on a new high quality balancer as protection on your brand new rotating assembly?
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#6 | |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
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Quote:
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#7 |
Project92 SWB stepside
Join Date: Feb 2003
Location: Louisville KY
Posts: 4,793
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Flywheel can be had CHEAP. Hell you can get a SFI unit for $50.
__________________
92 C1500 stepside 496 Stroker Competiton Engineering Ladder bars/QA1 coilovers. Dana 60 rear with 4.10 gear and posi. Bonspeed Palisade 20x12 in rear w/335/30/20 and 20x8.5 front w/245/40/20. 5/8 drop with Belltech springs/DJM spindles/drop shocks. WWS Progress thread http://67-72chevytrucks.com/vboard/s...d.php?t=140448 |
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#8 |
Registered User
Join Date: Dec 2002
Location: Hills of Western Mass
Posts: 626
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I had to buy a new flexplate for the exact reason that swervin mentioned and it was only like 25 bucks.
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86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club! |
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#9 |
Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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I bought a flexplate for my truck for like $25 a few years ago.
I would strongly reccomend replacing it...it is so cheap and easy to put on while the motor is out, and will give you hell to replace it if your ring gear gets a bit worn in the future.
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg |
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#10 |
Gentleman Jim Driver
Join Date: Nov 2002
Location: Poulsbo, WA
Posts: 1,550
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Eric knows all about the woes of a broken flex plate...
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Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed |
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#11 | |
Registered User
Join Date: Dec 2002
Location: Hills of Western Mass
Posts: 626
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Quote:
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86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club! |
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#12 |
Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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What kinda transmission you got??
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI |
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#13 | |
Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
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Quote:
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#14 |
Registered User
Join Date: Dec 2002
Location: Hills of Western Mass
Posts: 626
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Well so far I have killed one 700 and one 350 in four years. This is in a 1/2 ton truck puling an 18' trailer and john deere 855 about 4500 lbs total and I do have a remote cooler for the tranny. I'll just go to the boneyard and get another for 100 and throw it in and it should last me another couple years. Thats why I bought the 67. Now I have a sm420 and 4.10 in the rear.
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86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club! |
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