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04-17-2024, 08:43 PM | #1 |
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SBC crank clearance?
am going to redo an old SBC which had a Lot of bearing clearance [3 on R & 3.5 on M, 50 wt oil 90lbs PSI OLD]
crank is std - clearance. I want to turn it 10-10 and start new. what is the best clearance for a race engine, good rods, 7K max. no more high PSI or heavy oil. Cleavite P bearings Thanks Rod in AZ |
04-18-2024, 05:46 AM | #2 | |
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Re: SBC crank clearance?
Quote:
I'm pretty confident if you can get your Main and Rod clearance's between .002 to .0025 you should be in a good zone. Running to 7500 rpm with 5/ 30 wt. oil 60 to 70 lbs. of oil pressure will also be safe. Have a good day, also have the crank magged for cracks before having any work done is also a good idea. Respectfully, Henry Kunz 1534 H/SA |
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04-18-2024, 12:04 PM | #3 |
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Re: SBC crank clearance?
clevite H series bearings r a good thing too. be aware the H series rod bearings r marked for upper/lower orintation.
Last edited by richie 2; 04-18-2024 at 12:29 PM. |
04-18-2024, 01:16 PM | #4 |
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Re: SBC crank clearance?
What Henry said is spot on, that’s exactly what I shoot
for clearance and pressure wise, things are happy there and will give good performance and longevity!
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Ron Mattson 5015 STK |
04-18-2024, 07:12 PM | #5 |
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Re: SBC crank clearance?
I like 0.002" on the rods, and 0.0025" on the mains, and I prefer the King bearings. If you go higher than that on clearance, you probably need to use thicker oil, ie. 20W50.
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Alan Roehrich 212A G/S |
04-19-2024, 07:46 PM | #6 |
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Re: SBC crank clearance?
thanks all for the help. funny to think back on how ideas used to be. you can just imagine the cam/dist gear milling away trying to turn an oil pump shimmed to pump 90 lbs.!!
Rod in AZ |
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