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What should the exhaust gas temperature should be with 420 main jets at idle - 3" from manifold, both outside cylinders are at 66 celcius - center cylinder exhaust is at 135 celcius....what could be the problem ????
 

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There is an exact distance from the piston skirt.(3.937")100mm. Book says 635c is normal and preignition at 676c. Talk to Jaws and see what they recomend for jetting?
 
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