I had F.A.S.T. Build me a 4mil serval a few years back, I had over 800 hours and LOTS of miles on that motor. It was on pump gas and took serious abuse. Only reason I got rid of it was because it was low on compression and I decided on a 10 serval. The serval is a badass motor, I definitely had more fun with the 10mil but the life of the 4mil was way longer.
I enjoyed the 4mil stock cylinder I had but the serval was a lot more fun. I personally won't do a 4mil stock cyl again
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