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Don't know if you folks have seen it yet so this notice is to 0int this out. Member Mark Duggan has posted scans of an article from a 1954 Speed Mechanics magazine detailing the addition of performance parts to a 53 Plymouth with a 218 engine. The arrivals give dyno readings for each change. So now we have documented results for the question is there a difference. The dyno numbers in the articicle are very much in line with what I encountered with my modified 230. Please note that they are not running peak pull HP but measuring HP at real world rpms, and three is no aero drag number added in. When I did mine there was a data entry for this aero HP load. There was no data for the old Plymouth so we used the average from several mini vans listed in the dyno makers data files. This average was 51 HP which was added to the dyno pull to calculate total HP . My car with the bored 230, with milled head and deck, and dual carbs but single exhaust. My raw number at 62 mph/3280 rpm (62mph) was 76, which is in line with their finding of 67 HP for the 218. Add in the 51 aero HP and you get rear wheel HP of 118 for the 218 and 127 for the 230. According to their numbers, I would add 2 to 3 HP for dual exhaust. Not enough to justify a change at this point. But it seems the answers to the questions of what it does and is it worth it are answered in these old articles. The info is in the downloads section for you information. Thanks Mark. I found it by using the unread new files button one the upper right of the header bar next to the search icon. G hi p Bb