piston clearance in bore?

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piston clearance in bore?

Post  racinghabbit on April 23rd 2013, 12:18 pm

I know that .004 is normal bore clearance,

But, I have a motor with 4.390 pistons and it has file fit rings. All out race only engine... 12.50:1 compression

Will it be ok with .007 to .008 piston clearance?????

what do you guys think, Thanks
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Re: piston clearance in bore?

Post  dfree383 on April 23rd 2013, 12:29 pm

loose is fast ! as long as its a race engine and they are forged it will work.
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Re: piston clearance in bore?

Post  bbf-falcon on April 23rd 2013, 2:48 pm

Until you reach "excessive" loose is better than tight imo. Very Happy

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Re: piston clearance in bore?

Post  res0rli9 on April 23rd 2013, 8:00 pm

Hell I use to run .010 back in the day but they have better pistons now. run it Smile

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Re: piston clearance in bore?

Post  racinghabbit on April 23rd 2013, 11:37 pm

running it...
Thanks
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Re: piston clearance in bore?

Post  69F100 on April 24th 2013, 12:09 am

My 460 I had in my Ranger I ran them loose it needs boring but I put a new set of cheapo speed pro flat tops in it and bought a set of over sized ring and cut them to fit and ran it turning it 6500 rpm.
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