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How many people are successfully running 10-1+ compression Iron Head 400's on Pump
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08-25-2019, 08:17 PM
John Milner
Ultimate Warrior
Join Date: Nov 2004
Location: Oklahoma
Posts: 1,173
I am on several engines. My stock 96,000 mile ys 400 in my 69 gto, 10:1 455, 10:1 421, 10:1 428, 10:1 400. Just run the best fuel you can and have your timing dialed in and you’ll be fine.
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