quote:Originally posted by captaintobeys:
I would like to avoid fly cutting the pistons.
Come on Jones, McCall, George, Jules, Jack, Pantera Doug, and others.
Me? Really? Huh?
Well what George suggested is very good, but I wanted to match the valve lift to the flow values of my A3 heads, so I went to the CompCams 294 solid lifter profile. It's a .605 lift.
The A3 heads flow 330 @ .600 on the intake. 220 on the exhausts. It's like this cam was made for them. Your iron heads SHOULD show about 300 cfm on the flowbench at .600. All they need is a good valve job.
For what I use the car for, I don't mind the 74 degree overlap this cam has at all.
It DOES have a very interesting idle. Sounds like a marching band, boom, boom bada-bada boom boom.
It idles at 650 rpm with the Webers, and the 180s make it scream through the exhaust at ANY rpm with these headers and mufflers like a F1 car.
I once had my cap knocked off of my head walking about 20 feet behind a GT40 running...by the exhaust pulse of the headers. Guess what? My Pantera did this to me too.
Does it throw fuel vapor back through the carbs? Yup. Do I care? Nope. Ran Webers for 35 years this way. Haven't blown up anything yet...AND I am "como si dice" ...not gentile with the throttle.
Does it make enough vacuum for the brakes? Nope, but that is also a function of independent runner intakes not making enough volume of vacuum.
Very, very, very simple solution...CompCams vacuum pump. With all the engine noise existing, you don't notice the pump. Works great though.
The benefits to all of this? Like a kid riding the roller coaster at "Playland" who won't get off.
Interesting effects? Yup. Ferrari owners behind you turn on their windshield wipers...and use the windshield washers! Corvette owners at red lights who pull up alongside will never say "hey, nice car". They look straight ahead like you don't exist AND you will see them playing with their radio...mostly turning up the volume? GOTTA' LOVE IT!
It is fine on the street. It is what you want on the track at an open track event. The secretion of endorphin's in the brain seem to be stimulated by this entire setup. I just kinda float around, feet never touching the ground with this setup. Weird if you ask me, but I don't do drugs. I do this stuff.
...oh, this ain't none of those roller things, it's a straight up old fashioned solid lifter. You know. What Tyrannosaurus Rex used to kill with? Simpler. Less parts to break.