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  #1 (permalink)  
Old 07-17-2004, 10:16 PM
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350 chevy help

Hi,
i am needing to find out some information on a 350 chevy block ,
crank and flexplate .
i have a 350 4 bolt main #s 3970010 which i was told was out of a
75 - 79 chevy pick up 2 wd .
i aquired the motor just bare block, had it bored out , and
installed my parts .
what i need to know is should this motor have a crank shaft and
flexplate for the pickup application or would those for an
automobile be the same ?
the one in now are for a 75, 76 350 automobile block .
i am having a lot of problems keeping starters in and am trying to
figure out if this could be a possible cause .
every starter ends up having the bendix , gear wiped out .
one had a tooth broke off the starter and most recently the nose was
busted off .
i have tried shims ( different configurations ) but nothing seems
to work .
i was also told that chevy starters do not need to be shimmed.
i was told that this block should have GM starter #1876555.
and the flexplate would be GM #471598 ,,, 168 tooth.
so do i need to install crank and flexplate for the pickup
application or would there be any difference ?
hoping that someone here can shed some light on this for me .


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Old 07-17-2004, 11:40 PM
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GM used 2 starters and 2 flexplates in these years, a straight bolt pattern starter, used with the 12 inch 153 tooth plate, and the staggered pattern, used with 14 inch 168 tooth plate.
Since I`ve already went through the starter wars with my car, here`s some things to look for. Make sure your using the correct bolts with the shank head, when you install the starter, make sure the shank heads are in the starters machined grooves, this keeps the starter from moving. make sure there are no washers of any kind on your starter bolts. Torque them to spec with a torque wrench when you install them. Next up is add grounds, run a 2 or 4 gauge ground from the frame to the block, and another from the block to the battery.
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Old 07-18-2004, 01:05 AM
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350 chevy

i have the same block and had it bored .060".the crank and flexplate sholdn't matter in your case except all the carnage you're having seem to say that you have damaged teeth on your flexplate.check that out and if they aredamaged install your pick parts.there is a 14" 168 tooth flex plate and a 12 3/4" 153tooth flex plate and three different starters that have different mounting bolt holes,straight across,diagonal,and straight across and diagonal mounting holes.the latter goes with the 14" flex plate and the straight across goes with the 12 3/4" flex plate.all three starters have different armaturers and different nose pieces.still, check your teeth first and when you go to mount the starter the bendix trow out wheel can be pulled out by hand before hooking it up and you should be able to slip a paper clip between the bendix throw out wheel and the flex plate teeth.hope this helps.oh yeah chevy starters do use shims how ever most people just use different sized washers.
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Old 07-18-2004, 07:15 AM
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350 chevy help

flexplate teeth are fine ,,, its the 168 tooth and the starters have been the stagger bolt type , i also use the starter brace on the back and a heat shield as well .
i have used the paper clip to guage with , iwill use the shims and they will usually start good for a few days then it will start rakeing when i go to start the motor .
i have followed all the starter install directions correctly and still end up with the same result so what else is left ?
thats why i was wondering if the crank and flexplate may be the wrong one for the block .
i have never had this type of problem with chevy starters before and i have installed quite a few down through the years .
thanks ,
Joe
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Old 07-18-2004, 08:07 AM
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SOME, Chevy blocks are out of spec enuff that you have to cut the starter mounting surface to keep them from eating starter drives and ring gear teeth. I have had a couple of them. Right now I have a 4.3 in a S-Blazer that also has the problem. I had to take .030 off the starter mount face to get the starter to engage correctly and not eat drives. This thing would eat a new starter drive in a week!!
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Old 11-08-2009, 03:08 AM
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How to fix

I have a 76 K5. The starter has a brackit on the back side that keeps it from moving. Previous owners like to remove for some seasion. This brackit ataches to the starter at the end and goes to a bolt under the #4 cylender exhoust. This it how I fixed mine.
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Old 11-08-2009, 03:10 AM
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This thread is 5 years old.
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Old 11-08-2009, 05:46 AM
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I guess he got it fixed huh?
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