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My 57 Chevy feels the need for NO speed.
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<blockquote data-quote="swampratt" data-source="post: 3556792" data-attributes="member: 15054"><p>I am shooting for 20MPG with this 268H on a 114 LSA NO overdrive.</p><p>Carbed also.</p><p>Seems the best I can ever do is 18 MPG from my V8 carbed stuff and keep excellent low end TQ without sacrificing too much mid range power.</p><p></p><p>The LS heads are punks when it comes to MPG in a truck. You do not get great atomization with the smoothish runners and that </p><p>rocker arm boss in the intake runner makes for a dead spot and some reversion behind it.</p><p>Porting the runners a bit there and making them very rough helps in the power and MPG department.</p><p></p><p>If I was FORCED to run an LS I would do the 6.0 and run the 706 head.</p><p>I would port the 706 though <img src="/images/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p><p>I have ported 706 and 317 heads only so far for the LS.</p><p>I have ported all kinds of old iron heads and even a Geo Metro head HA!</p><p></p><p>A really good read on the LS and head swap with dyno numbers etc.</p><p><a href="http://www.superchevy.com/how-to/engines-drivetrain/1712-surprising-hp-numbers-from-our-stock-ls-cylinder-head-test" target="_blank">http://www.superchevy.com/how-to/engines-drivetrain/1712-surprising-hp-numbers-from-our-stock-ls-cylinder-head-test</a></p></blockquote><p></p>
[QUOTE="swampratt, post: 3556792, member: 15054"] I am shooting for 20MPG with this 268H on a 114 LSA NO overdrive. Carbed also. Seems the best I can ever do is 18 MPG from my V8 carbed stuff and keep excellent low end TQ without sacrificing too much mid range power. The LS heads are punks when it comes to MPG in a truck. You do not get great atomization with the smoothish runners and that rocker arm boss in the intake runner makes for a dead spot and some reversion behind it. Porting the runners a bit there and making them very rough helps in the power and MPG department. If I was FORCED to run an LS I would do the 6.0 and run the 706 head. I would port the 706 though :) I have ported 706 and 317 heads only so far for the LS. I have ported all kinds of old iron heads and even a Geo Metro head HA! A really good read on the LS and head swap with dyno numbers etc. [URL]http://www.superchevy.com/how-to/engines-drivetrain/1712-surprising-hp-numbers-from-our-stock-ls-cylinder-head-test[/URL] [/QUOTE]
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