Nice power curve Mr B. More to come once you get the revs up to closer to 7000rpm.... you power curve has not rolled off, so there is more to come if you feeling brave and fix the clutch......
Ok, for the record, UAS847 make 70.3hp, being reved up to 72mph in 3rd gear. Not sure why the operator used 3rd gear, but I guess it goes not matter when the road can just compensate for the losses in the system. Lambda was about 0.8 to 0.9 once adjusted, and the work on the carb added about 5bhp.
To be honest, I was hoping for more that I got, but in reality, the engine was re-built a long time ago now (about 15 years) and apart from being well screwed together with some trick bits to help it stay that way, it only actually has the big carb, a stage one "home office" porting job, a light head skim, a 1280cc overbore, and a fairly larie cam (295'), oh, and the exhaust. Standard valves, standard ignition (amazing it works at 6500rpm!) and a standard clutch that JUST holds the power (previous clutch, same size, different make slipped). Stock chevette 1256cc makes 57hp, so thats a 23% increase, and of course against the original HA output of 44.2hp, its a 60% increase, which explains why it still feels nippy.....
Got to find the time/money to pull it out, rework the bottom end, up the compression to about 10:1 and get some bigger valves in there. That should help the carb (which in reality is too big) and the cam to respond better.
Just for comparison to modern motors, a Deluxe HA weighs about 720Kg, so 70bhp equates to to just a bit under 100bhp per ton, or the same as a 1998 1.6 Focus (35 years younger!) If I can get to the 90bhp mark, then its 125hp/ton and thats getting respectable modern get up and go. Its so easy to forget how much modern cars weigh. 2.0 focus Ghia, 1250kG, thats 1/2 a ton more than an HA....... so needs about 150bhp to keep with a 90hp HA.... the plan comes together.....
I'll not go in the V6...
Tony (HA21)
made 93bhp at 7400rpm 
