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SVTPerformance's Chain of Restaurants
Tuning À la carte
Hello to everyone. 5.4 Navi Dohc Q.
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<blockquote data-quote="decipha" data-source="post: 16377484" data-attributes="member: 74327"><p>when running LPG make sure you run a high pressure system</p><p></p><p>you'd want static compression around 13:1 which still allows you to run pump gas if need be</p><p></p><p>by far the best pistons you can get for your setup are going to be autotec/ractetec pistons</p><p></p><p>you can run scat rods no problem</p><p></p><p>stock 5.4 cranks are forged, I've pushed over 1200rwhp on a stock 5.4 crank so you should be fine. I have heard of cast cranks but have never personally seen one before and I've built several 5.4's over the years.</p><p></p><p>the 4r100 trans is a heavy clunky and slow transmission. In all of my harley trucks I've always upgraded to the 4r70w trans. I've blown up several 4r100s I have yet to blow up a 4r70w.</p><p></p><p>stock cams are fine theres no need to replace them. Some people run the older cobra intake cams and gain a few hp so if you can score them for cheap that wouldn't be a bad idea.</p><p></p><p>When porting a general rule of thumb is to never cut the bottom of the port. </p><p></p><p>As you've learned you should upgrade the exhaust valves regardless. I'd recommend some comp 6000 valves or the like.</p></blockquote><p></p>
[QUOTE="decipha, post: 16377484, member: 74327"] when running LPG make sure you run a high pressure system you'd want static compression around 13:1 which still allows you to run pump gas if need be by far the best pistons you can get for your setup are going to be autotec/ractetec pistons you can run scat rods no problem stock 5.4 cranks are forged, I've pushed over 1200rwhp on a stock 5.4 crank so you should be fine. I have heard of cast cranks but have never personally seen one before and I've built several 5.4's over the years. the 4r100 trans is a heavy clunky and slow transmission. In all of my harley trucks I've always upgraded to the 4r70w trans. I've blown up several 4r100s I have yet to blow up a 4r70w. stock cams are fine theres no need to replace them. Some people run the older cobra intake cams and gain a few hp so if you can score them for cheap that wouldn't be a bad idea. When porting a general rule of thumb is to never cut the bottom of the port. As you've learned you should upgrade the exhaust valves regardless. I'd recommend some comp 6000 valves or the like. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Hello to everyone. 5.4 Navi Dohc Q.
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