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General Discussion
Propane ???
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<blockquote data-quote="79F150" data-source="post: 183536" data-attributes="member: 2919"><p>I have not made any adjustments yet. I have had many projects going at once. Timing is set somewhere around 8 or 10 degrees if I remember right. I am running a 400 with flat top pistons back when dyna gear was in business. They made a set to bump compression to around 10:1 I think for propane. At least the pistons were originally designed with that intent from what I was told. When I put them in I just wanted more compression for the engine. The stock 7.9:1 compression really killed the 400. Anyways I run a comp cam 265 deh and my 3 key way timing set is set to the advanced 4 degrees.</p><p></p><p>Distributor is stock dura spark but I did do some modification. I do not use a vacuum advance any longer. Mine is all mechanical advance. I changed springs and messed with the weights until I got the advance to come in when I wanted it to. </p><p></p><p>I do have another question. Is there a recommended method for tuning the impco 425. I still have to set it up as well as the timing?</p></blockquote><p></p>
[QUOTE="79F150, post: 183536, member: 2919"] I have not made any adjustments yet. I have had many projects going at once. Timing is set somewhere around 8 or 10 degrees if I remember right. I am running a 400 with flat top pistons back when dyna gear was in business. They made a set to bump compression to around 10:1 I think for propane. At least the pistons were originally designed with that intent from what I was told. When I put them in I just wanted more compression for the engine. The stock 7.9:1 compression really killed the 400. Anyways I run a comp cam 265 deh and my 3 key way timing set is set to the advanced 4 degrees. Distributor is stock dura spark but I did do some modification. I do not use a vacuum advance any longer. Mine is all mechanical advance. I changed springs and messed with the weights until I got the advance to come in when I wanted it to. I do have another question. Is there a recommended method for tuning the impco 425. I still have to set it up as well as the timing? [/QUOTE]
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