There is a lot to this and I have a basement full of failed attempts to get mine to work. I started with PTFB's first "attempt" at a drop base which is a miserable POS. Didn't fit, didn't drop enough and sure as hell didn't flow anything. I ended up modifying the hell out of it, then adding an Air Raid 3" conical filter. If you want some entertainment on the hassle, go here: http://transamcountry.com/community/...?topic=53872.0
After a lot of attempts, it seems like PTFB finally has a product that meets expectations and although I am not a big fan of the way Dave handles his business or attacks customers critical of his products, it appears this last version which is suspiciously similar to what I did before his was released, is probably the best available at this time. I would definitely pick it up through Butler though
Also, here is a link to an article that provides some additional measurements and comparisons: https://www.hotrod.com/articles/hppp...d-replacement/
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71 Formula 433, Splayed cap 400 block, 4" stroke Scat forged crank, 6.8 Eagle rods, custom Autotec pistons. SD 295 KRE D ports, Old faithful hybrid roller, Torker II, Holley Sniper Stealth, Tribal Tubes, TKO 600, 3.73 Eaton posi.
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