opinions please on con rod bolts

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sdiesel
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opinions please on con rod bolts

Post #1 by sdiesel » Fri Sep 21, 2018 12:40 am

please dispell or verify an oft heard tale:


ford's rod bolts need to be replaced at every rebuild. regardless as they are considered weak and prone to stretch and break if re used.
what validity does this statement cary?

on race engines the proper path might be obvious.
on a street driven mostly stock engine....
thanks all.
it's nice to come back here after a long absense and hear familiar voices, and listen to a surprisingly large number of new voices
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

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xctasy
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Re: opinions please on con rod bolts

Post #2 by xctasy » Fri Sep 21, 2018 1:24 am

Allways true. You can decide not to replace, and that's your risk, but Ford rod bolts on in line sixes have always been on the plasticine side of strong.
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jason832
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Re: opinions please on con rod bolts

Post #3 by jason832 » Fri Sep 21, 2018 8:45 am

Changing them means getting the machine shop to resize the rods as well. For a street engine that doesn't see more than 5000rpm I'd keep the factory ones. I did on mine (4bbl, intake, cam, hyper pistons, headers) and have been pulling to to 5k many many tomes a day for over a year. French town flyer also has a drag vehicle with stock rods and a massive amount of passes. Stock rod bolts are pretty good.

Crank is strong for the street, so is the factory rods (all are forged) and rod bolts. Stock pistons are a weakness though.

sdiesel
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Re: opinions please on con rod bolts

Post #4 by sdiesel » Fri Sep 21, 2018 10:03 am

thanks fellas,

and this is exactly what i hear from those floating around the gargae here. opinions on either side. of the question. admittedly the opinionators are mopar people.
nonethe less, ....
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

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THE FRENCHTOWN FLYER
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Re: opinions please on con rod bolts

Post #5 by THE FRENCHTOWN FLYER » Fri Sep 21, 2018 1:21 pm

jason832 wrote:... French town flyer also has a drag vehicle with stock rods and a massive amount of passes. Stock rod bolts are pretty good.

Crank is strong for the street, so is the factory rods (all are forged) and rod bolts. Stock pistons are a weakness though.


true, except the later model hypereutectic pistons are good too. Its the earlier cast pistons with the expansion strut that are problematic.
Last edited by THE FRENCHTOWN FLYER on Fri Sep 21, 2018 10:51 pm, edited 1 time in total.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

sdiesel
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Re: opinions please on con rod bolts

Post #6 by sdiesel » Fri Sep 21, 2018 3:04 pm

jobbers service , where i at one time could buy a steel crank on a phone call, in Portland Oregon, told me today that maybe one in ten customers ordered new rod bolts in their 300 rebuilds.

Jobbers, for years, catered to one very large customer who rebuilt their 300's in their fleets of airport tuggers and trucks,
and also another customer who loved the color brown. But that was many years ago, and the supply has since dried up.

he said that to his recollection, the only ford with weak rod bolts was the early 460.

he cannot remember a failure due specifically to rod bolts on a 300 six.

does this sound like reassurance?
i should still pull that steel crank and save it.....
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

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