Build: 1971 2 Barrel 350, apparently only 63,000 miles. Car it was from looked pretty nice, so it's believable. Stock Bore 3.0/181 v6 pistons, about .094 in the hole, .042 head gasket. I believe it's about 9.6:1. stock rods, reconditioned stock crank, .010/.010 .002 clearances on the dot Underdog 350 timing cover, still doing great stock heads, surfaced/valve job TA DP intake EverydayPerformance 17057241 800cfm Qjet, further tweaked by me. Hooker 1103hkr headers TA HEI, 34* all in by 2700rpm TA 310 cam 2.5" dual exhaust, straight out the back, no mufflers. Relatively mild build. Made 247hp/274ftlbs to the tire on a mustang dyno. That's within 3hp and 1ftlb of my personal guess, so I'm pretty content with that. This was mainly just a curiosity run, wasn't chasing any particular number. Secondaries were opening pretty late, according to the dyno guy as he was standing there watching the carb they didn't open fully until 4300rpm. And I can tell they need to open sooner as well, given the gasoline stains on the air doors. I believe that is the cause for the sharp dip in AFR reading (purple line) that the graph shows.
And, for comparison, my previous engine (rip) was a very high mileage 3x reringed '70 SP 350 that was bone stock at the time of it's dyno run besides a crower level 3 cam, .042 head gaskets, and that same TA HEI but only 30* of timing, factory intake, manifolds, terrible exhaust with chambered mufflers, etc. That combo made 211hp@5003rpm and 263ftlbs@2700rpm.
Imagine what big valves would do. And figure static loss thru drivetrain. Of 30-40 hp . So easy 280-290 hp.
I think its all 3 variables layered on an incorrect scale, or a glitch. i dont really know. the last run i did 2 years ago the graph was normal.
Midstate machine. East side of dsm. In between the fairgrounds and firestone plant. That general area.
I can confirm this combo is faster than a 2020ish v6 challenger. I'd post the video but itd be considered exhibit A.
80 for a one and done but both times I went they Tbh were just curious because it's a sbb so they did a few. Normally its $100 plus more per hour if actually dping some tuning I can confirm that a single snorkel air cleaner made less than 3hp in difference in power vs no air cleaner.
