351m/400 oilling problems?
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Freshman User
Joined: Nov 2008
Posts: 46
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From: iowa
351m/400 oilling problems?
Are 400's known to have oilling issues? The motor that was in my truck had a bad bottom end knock when it warmed up. The motor in it now is a hard runner, but its starting the same deal.
Cargo Master
Joined: Dec 2004
Posts: 2,232
Likes: 3
From: NE Texas
When these engines are used as intended for low and mid range torque, and they are properly maintained the bottom ends do fine. When they are run at very high RPM without proper modifications, is when you will reveal some problems.
The crankshaft is VERY heavy and the oiling system is not designed for high RPM operation. If you are turning it to high RPM, you will need to consult Tim Meyer or someone with equivalent experience to learn the correct modifications to allow very high RPM life.
The crankshaft is VERY heavy and the oiling system is not designed for high RPM operation. If you are turning it to high RPM, you will need to consult Tim Meyer or someone with equivalent experience to learn the correct modifications to allow very high RPM life.
Lead Driver
Joined: Mar 2004
Posts: 8,924
Likes: 153
They hold up for most applications fine if you check all bearing clearances with a dial bore gage, champher the oil holes in the crank, and use a h.v. pump and always check lifter fit as well. Chech the main bearing bores and the rod bores with a dial bore gage, they should be straight across and round within .0002 and a lot of them aren't, thats where trouble starts, with any botom end.
Posting Guru
Joined: Dec 2002
Posts: 2,003
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From: chicago burbs
not starting a fight, just sayin,
good luck getting 'proper' bearing clearances from a reground crank kit. it would seem that they use the limit spec and give it some clearance from there. Tim Meyer custom ground the crank to make spec in the bearings as installed, i wonder how much larger his journals were compared to a crank that you or i would get from a 'rebuilder', to make 'proper' clearance? IIR Tim did state that his journals were above spec?
not only 'rebuilder' regrinds but within spec good to go used cranks on new standard or undersize bearings will come up showing .0025" main clearance on a good day. seems like the grinders are adding a .001" and the bearing manufacturers are adding a .001", by that time the only option other than custom clearance regrind is to use the HV pump, no big deal but it would be nice to be able come up with less than .002" clearance if you want to.
then add worn lifter bores and the HV pump is the way to go.
good luck getting 'proper' bearing clearances from a reground crank kit. it would seem that they use the limit spec and give it some clearance from there. Tim Meyer custom ground the crank to make spec in the bearings as installed, i wonder how much larger his journals were compared to a crank that you or i would get from a 'rebuilder', to make 'proper' clearance? IIR Tim did state that his journals were above spec?
not only 'rebuilder' regrinds but within spec good to go used cranks on new standard or undersize bearings will come up showing .0025" main clearance on a good day. seems like the grinders are adding a .001" and the bearing manufacturers are adding a .001", by that time the only option other than custom clearance regrind is to use the HV pump, no big deal but it would be nice to be able come up with less than .002" clearance if you want to.
then add worn lifter bores and the HV pump is the way to go.
Senior User
Joined: Apr 2004
Posts: 259
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From: Eastern Ohio
My crank grinder is Brewster Machine. I don't know how he ground my cranks, but I know they have been in business for 75 years. They do the cranks on many of the Ohio sprint cars and many of the cars taking the checkered flag at Eldora Speedway have a Brewster crank in them.
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Lead Driver
Joined: Mar 2004
Posts: 8,924
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I always tell the person grinding it to leave it on the low limit if I have to use a turned crank.
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Cargo Master
Joined: Dec 2004
Posts: 2,232
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From: NE Texas
I do have an extra 64, but it's a completely trashed parts car that I am getting a manual transmission out of. Try galaxieclub.com.
Elder User
Joined: Oct 2007
Posts: 566
Likes: 1
I know the 351C's had a low oil pressure problem at idle.
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