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Message: <blockquote data-quote="96blak54" data-source="post: 1468260" data-attributes="member: 14727">Good to know i have gained nick names!...mr compression...lol!If my mind serves me right, 4v heads decked .080" is right at the intake valve edge. I can confirm later.Going from 52 to 45 is a good bump, but every bit do-able. Hold on while i check chamber sized decked .080. Heck my last 2 builds i deck a set of npi heads  .120". The 1st of the 2 builds i ran zero deck 5.4l pistons meaning the compression was 18:1. It would barely idle safe on 93octane but when flushed out for E85, the game changed! It became a normal running engine that struggled to get to operating temperature...at 18:1 static compression. I learned alot from that build!! Alot that im not disclosing too!The 2nd build i went with normal stock flatop pistons the yeilded 13:1. It ran well on 93, it loved a 50/50 mix with E85....which is more like 65/35 or E35.Keep in mind what ever you deck the heads, itll affect the front cover to valve cover surface sealing and the timing chains will get slappy. Both easily fixableNow dial that exhaust cam back 1 chain tooth. Thatll make the LSA 105ish making exhaust open late and giving alot more overlap.</blockquote>