Originally Posted by deepockets
it's a door slammer, weighs 2910 with me in it, glide and 4.86 or 4.56 rear and 33 inch tire, thanks for the in depth request, the engine builder located in new your claims that the 380 picked up power across the board from going from the 355 dart to the enlarged 380 cnc.
Perhaps there was a power gain in that builder's application but it's
not that simple.
The head has to be matched to your application, . . and by just
sticking a bigger head on the motor could slow the car down
even if it showed a power gain on the dyno.
The key is the air speed in the port, .. when it getts to big it'll
get lazy, won't 60' as well and not recover well off the shift.
It might put up a big number on the dyno but in the case of
a 3000 lb car very easily could be slower on the track.
Personally I think if you are turning your engine as hard as a typical
bracket style engine, maybe shift 6800, 7000, . . then it's likely
you have the right head now, ..
I'll ask my guy at Dart when I speak to him tomorrow
what the cross sectional are is in the 380 cnc.
how much power do you make now?
Cheers,
Curtis