Pasi S. Posted January 24, 2015 Report Share Posted January 24, 2015 So Jeff said that 21cc domes are good for your 421 Serval with +4 timing and 93 pump gas.Thats good to hear. Sometimes people will end up with too much compression and they have to go for better fuel or order another set of domes. That´s why I asked. Quote Link to comment Share on other sites More sharing options...
satts Posted January 25, 2015 Report Share Posted January 25, 2015 Yup I agree with what dirtydownunder said don't use the ez spring . With all the tranny mods it will shift far too easy , I changed mine back to stock ,was using a mull star with the ez spring and detent bearing and only had to hit bumps hard enough and it would shift itself Quote Link to comment Share on other sites More sharing options...
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