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post #1 of 4 (permalink) Old Apr 12th, 04, 07:45 AM Thread Starter
Join Date: Apr 2004
Posts: 12

What is best, File fit rings or standard gap?
The bore is 4.310 and speed pro has one kit for this boreī, 4.250 +.060!
br jimmy
Terracan is offline  
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post #2 of 4 (permalink) Old Apr 12th, 04, 04:19 PM
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Join Date: Jan 2002
Location: Calgary, Canada
Posts: 1,860

Terracan,- Kinda depends on if it is a street motor or a race type application. File fit rings are great, but it takes a few hours to properly gap them, and unless you have done a lot of file fit rings, it can be sometimes very difficult to get the gaps parallel and consistent.
Since most ring companys are recomending approx. .0045 gap per inch of bore on the 1st, and .0055 on the 2 ring, unless the motor is extremly loose the std gap rings will suffice.
Based on a 4.310 bore thats .019 on the 1st ring, and .023 on the 2nd groove. Street type applications probably require more gap, CHECK with the ring companies for their recomendation. Also The ring companies have found that opening up the 2nd gap has picked up power on the dyno. Nitrous applications call for more gap.
Hope this helps.

2002 Jerry Bickle Cavalier, 446" Small Block, Brodix Canted Valve, lenco 5 speed, 7.54 @ 180. mph,1.06 60', 2235 lbs for 2014. GM Canada Docs, Highly Optioned 69 RSZ28 , Hugger Orange, White Stripes, 42,000 mile survivor, owned since 1973.
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post #3 of 4 (permalink) Old Apr 12th, 04, 05:08 PM
Join Date: Feb 2004
Posts: 33

Checking ring gaps is an easy blueprinting technique that assures that you have the correct rings to fit your actual bore size. Measure them 1 inch down bore. You will have peace at heart that the proper ring fitment has taken place, no loss of compression-blowby etc. for max power output! So gap those rings!
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post #4 of 4 (permalink) Old Apr 13th, 04, 04:21 PM
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Join Date: May 2001
Location: Chattanooga, TN, USA
Posts: 7,609

I used sized rings on my recent 427 rebuild, and checked each one in the proper cylinder. All were within GM spec.
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