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<blockquote data-quote="swampratt" data-source="post: 3104062" data-attributes="member: 15054"><p>My buddy James did the 6.0 LS with RPM intake and 750 cfm carb.</p><p>It is in a long bed truck with 3000 stall and 340 posi track rear gear.</p><p></p><p>Now something we noticed is the carb needed to be set up pretty fat to run happy with the setup.</p><p></p><p>Think about this Aluminum heads that have 210cc runners (a moot point on runner size really we do not know how long it is to make a fair comparison to old school heads.)</p><p>This head runs much cooler than an iron head.. The carbed intake sits way above a sealed off lifter valley so NO HEAT is introduced into the runners.</p><p>This is one reason we had to jet this carb fat... it was stumbling and falling on it's face even during a situation of easing slowly into the throttle.</p><p></p><p>Now the swap was done in the winter time and it was in the 40's outside and 20 minute drive would still not be enough to make it clear it's throat .</p><p>At wide open throttle after it recovered it ran really strong.</p><p></p><p>Or when ambient temps get into the 70's it runs very well.</p><p>This carb swap deal needs something to heat the runners.</p><p></p><p>Now I did experience the same situation with a tunnel-ram on iron heads with an old school build but after 10 minutes of driving the tunnel-ram would have enough heat in it even in sub freezing temps to allow it to act correctly.</p><p></p><p>Those dyno tests in a dyno cell do not account for real driving conditions.</p><p></p><p>I am all for carbs but When there are issues like we experienced with the 6.0 it gets lame.</p><p>Yes I have a cure.</p><p>I told my buddy we could make a sheet aluminum cover that encased the intake and held the heat that the lifter valley emitted.</p><p>Would look like crap but may have worked.</p><p></p><p>He did not want to try it as he is all about looks.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3104062, member: 15054"] My buddy James did the 6.0 LS with RPM intake and 750 cfm carb. It is in a long bed truck with 3000 stall and 340 posi track rear gear. Now something we noticed is the carb needed to be set up pretty fat to run happy with the setup. Think about this Aluminum heads that have 210cc runners (a moot point on runner size really we do not know how long it is to make a fair comparison to old school heads.) This head runs much cooler than an iron head.. The carbed intake sits way above a sealed off lifter valley so NO HEAT is introduced into the runners. This is one reason we had to jet this carb fat... it was stumbling and falling on it's face even during a situation of easing slowly into the throttle. Now the swap was done in the winter time and it was in the 40's outside and 20 minute drive would still not be enough to make it clear it's throat . At wide open throttle after it recovered it ran really strong. Or when ambient temps get into the 70's it runs very well. This carb swap deal needs something to heat the runners. Now I did experience the same situation with a tunnel-ram on iron heads with an old school build but after 10 minutes of driving the tunnel-ram would have enough heat in it even in sub freezing temps to allow it to act correctly. Those dyno tests in a dyno cell do not account for real driving conditions. I am all for carbs but When there are issues like we experienced with the 6.0 it gets lame. Yes I have a cure. I told my buddy we could make a sheet aluminum cover that encased the intake and held the heat that the lifter valley emitted. Would look like crap but may have worked. He did not want to try it as he is all about looks. [/QUOTE]
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