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Originally Posted by antyates

flat top the 13:1 comes from 54cc 289 heads, i wanted to see how much hp i could get out of all motor, stock, parts (i was on a tight budget) i put down 421 hp, I only was asking about the spray because it was all ready installed and i just put it all on my new engine because i didnt want to cut the wires or remove the dual purge

Lol....... I have 53cc heads and fat tops and have right about 10 to 1 compression.

I seriously doubt you have 13 to 1 compression with flat top pistons.