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Discussion Starter #1
I am set to dyno my truck this sat at rpm offroads open house in Bristol. I have never had a truck or a car dyno tested before but thought why not see what it makes. Here is my combo let me know your guess and I will post results Saturday evening. 466" stock crank with eagle h beam stock length rods. Probe. Forged small dished pistons 10.8-1 compression. Dove-c heads ported with 2.19 1.8 undercut valves. Flat tappet solid cam .648 in .624 ex lift 246 256 duration at 0.050 best I recall it was spec for a member here for a similar combo by Scotty j. Roller scorpion rockers 1.73 ratio. Ford racing victor intake no port work and 850 demon carb with 1"wood spacer. 1.75 tri y headers into 2.5 ex with cut outs. Still running full accessors minus ac compressor. Elec fan. But I will be turning a one ton 10.25 rear axle and t18 four speed with 205 t case and 33" mud tires so it's a lot of rolling mass. I turned this to 7,000rpm last truck pull but I'm sure I'm losing power by that rpm. I'm guessing 385hp and 495tq think I'm close?
 

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Well got the results today. Not as good as I hoped but seemed almost everyone was dispointed maybe the operator weather I dont know. Mine was 315 first run. Then raised the hood so it could get so it could get some fresh air. Did 334 hp then 337 @ 4800 and 375 tq @ 3600. Power really was lower in rph thN I thought. The dyno was not a dyno jet but had two rollers and he said it measured hp with out rpm input and he used my tach reading to put into the program at a certain mph to relate to rpm by wheel speed. Pulled it in 4th. Seemed mYbe a little rich . Think this seems right? Maybe a restriction in airflow is why it signed off so early. Told me that at 6500 it made less than 150tq but when I pull it pulls good at 6500
 

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IMO the dyno is off by a bunch, your combo makes close to 550 flywheel HP and 550 tq. even thow you are pushing all that big axel and tires it still should be around 400 RWH but thats just my opnion!
 
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