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Tech & Fab
Propane engine builds (tech, questions, advice)
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<blockquote data-quote="TBItoy" data-source="post: 257647" data-attributes="member: 1384"><p>That's probablay about what I will put together, good to know it runs good,</p><p></p><p>I'm thinking 351w (89 non-roller block), small chamber (for compression) aluminum heads from RHS or ?, and a "bigger" hydraulic flat tappet cam. Should be good for 375+? hp and run pretty much forever</p><p></p><p>Something like this cam:</p><p><a href="http://www.summitracing.com/parts/cca-35-243-4/overview/make/ford" target="_blank">http://www.summitracing.com/parts/cca-35-243-4/overview/make/ford</a></p><p>and these? heads:</p><p><a href="http://www.summitracing.com/parts/rhs-35011-01/overview/make/ford" target="_blank">http://www.summitracing.com/parts/rhs-35011-01/overview/make/ford</a></p><p></p><p></p><p>Of course, I've considered the "easy way out" and getting one of these edelbrock top end kits: Edelbrock claims 400hp/420ftlbs</p><p><a href="http://www.summitracing.com/parts/edl-2092/overview/make/ford" target="_blank">http://www.summitracing.com/parts/edl-2092/overview/make/ford</a></p><p></p><p>I figure if I can get 400hp engine, the propane kit, and ignition for ~$4000, then I'll be pretty happy with it.</p><p></p><p></p><p></p><p>I keep reading that the IMPCO 425 is only 450-470cfm, and that it will only support ~325-350 hp. It "seems" like lots of people are running some stout motors on one mixer, but if the 325hp figure is correct, then it almost seems like a waste to build a motor capable of 400+hp unless you are going to run dual mixers.... ???</p><p></p><p>According to the calculator, 460cfm will allow 351 cu/in to turn 5500rpm, so that might just work out. I've seen a LOT of 350 Chevys with aftermarket heads/cams/intakes on single mixers that seemed to "go" pretty good.</p><p></p><p></p><p></p><p>I should probably get a junkyard LQ4 and a TH400 :****:, but I've already got the 351w, a built C6, and some Superduty axles.</p></blockquote><p></p>
[QUOTE="TBItoy, post: 257647, member: 1384"] That's probablay about what I will put together, good to know it runs good, I'm thinking 351w (89 non-roller block), small chamber (for compression) aluminum heads from RHS or ?, and a "bigger" hydraulic flat tappet cam. Should be good for 375+? hp and run pretty much forever Something like this cam: [url=http://www.summitracing.com/parts/cca-35-243-4/overview/make/ford]http://www.summitracing.com/parts/cca-35-243-4/overview/make/ford[/url] and these? heads: [url=http://www.summitracing.com/parts/rhs-35011-01/overview/make/ford]http://www.summitracing.com/parts/rhs-35011-01/overview/make/ford[/url] Of course, I've considered the "easy way out" and getting one of these edelbrock top end kits: Edelbrock claims 400hp/420ftlbs [url=http://www.summitracing.com/parts/edl-2092/overview/make/ford]http://www.summitracing.com/parts/edl-2092/overview/make/ford[/url] I figure if I can get 400hp engine, the propane kit, and ignition for ~$4000, then I'll be pretty happy with it. I keep reading that the IMPCO 425 is only 450-470cfm, and that it will only support ~325-350 hp. It "seems" like lots of people are running some stout motors on one mixer, but if the 325hp figure is correct, then it almost seems like a waste to build a motor capable of 400+hp unless you are going to run dual mixers.... ??? According to the calculator, 460cfm will allow 351 cu/in to turn 5500rpm, so that might just work out. I've seen a LOT of 350 Chevys with aftermarket heads/cams/intakes on single mixers that seemed to "go" pretty good. I should probably get a junkyard LQ4 and a TH400 :****:, but I've already got the 351w, a built C6, and some Superduty axles. [/QUOTE]
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