Suggestions on performance upgrades for 225
That's funny, because just about every experienced slanty runner here would
disagree w/that statement.The cliffy is a better top end runner,and the offy is more torque
friendly for the street,.... have you looked at what the OP is driving?We're not talking an RPM
needy app here,and while the AVS is a fine carb,it is still more than he'll ever use w/o other
mods.Mainly increasing valve size and cam specs,so unless he's planning to go there......
Not in my experience.
'73 Duster with rebuilt stock 225. The engine was set up with cast iron Super Six manifold along with a Autolite 2100. I changed out the Super Six for an Offenhauser with the same carburator. No changes in ETs and no change in the butt-o-meter. Conclusion, the Offenhauser manifold is no better then a Super Six.
'65 Dart, mildly built 225. I ran that same Offenhauser with the 500 AVS. It ran good, changed over to the Clifford with the same carburator.I gained 2 tenths on the track and there was a noticable change in the butt-o-meter with better response through out the entire rpm range. Conclusion, the Clifford is a better over all manifold.
I also drive my Dart daily. So i have extensive experience with this combo.
The 500 AVS is a very capable carburator. The primariy throttle bores are the same size as the BBD. The secondary air flap is controlled by air flow, on my Dart, it starts opening around 3500 rpms, which is slightly over 70 mph on the freeway. On a van they may never open, which would make the carb a BBD with extras. Also the AVS is a new carburator, calibrated for todays gasoline. You can actually buy parts for it so you can tune it.
It is not a crappy 40 year old remanufactured piece of junk, with a worn out throttle shafts. Unles you run across NOS one, but then it would be calibrated for '70s gasoline without any way to tune it.
But then the "experts" know better. Especially the one's at Clifford how are trying to sell an oddball Weber IDA on there 4300 4v manifold.
