Finally working and a set of heads for me, or Matt

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pittsburghracer

pittsburghracer

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Waiting on a check to order some Ferrea 2.055 and 1.60 valves so I can finish a customer’s Speedmaster heads and a Victor340 was weather delayed today for another customer. So I don’t feel guilty working on my junk. I grabbed a set of Edelbrock heads with 2.02 valves that I ported probably 10 years ago. I stripped one down and did some more porting then I cut seats for 2.08 valves on my seat machine putting a 70-60-45-30 degree seat on them and a 30 degree back cut on the valve. Then I cut the spring pockets for bigger roller springs. Man was that job easier than doing them on my drill press. Well I was super pleased till .600 lift where they stalled. The 70 degree cutter left a lip on the shortside which I quickly hit with a sanding roll. After I play around checking airspeed in a few spots I’m going to reshape that lip and hopefully that will fix my issue.

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Looks great! Blend that machined lip at the bottom, and open up into the chamber the top above the 30, I bet it picks up a nice amount
 
I'm not sure how close to the chamber wall your intake valve is in those pics, but they make a nice adjustable cutter tool to "sweep" with, makes it super easy to un shroud the valve, and make them all consistent. Some heads pick up quite a bit by doing that. Same as blending with a burr and a old valve, but way faster, and uniform
 
replicaracer43 said:
I'm not sure how close to the chamber wall your intake valve is in those pics, but they make a nice adjustable cutter tool to "sweep" with, makes it super easy to un shroud the valve, and make them all consistent. Some heads pick up quite a bit by doing that. Same as blending with a burr and a old valve, but way faster, and uniform
Click to expand...

Ya I’ll double check a few things tomorrow after I probe for air speed. My old open chamber heads on the car now went 318cfm. My bore adapter is only 4.015 so that doesn’t help either. I do know that 10-15 degree top cut helps the piss poor chamber on these heads but I wanted to see what just the cutter did. I have a Neway cutter for that job.
 
That flowrate @ .400" is phenomenal, I would be worried about chasing a stall and sacrificing that .400" #. I've learned to listen to that little voice over the years. J.Rob
 
RAMM said:
That flowrate @ .400" is phenomenal, I would be worried about chasing a stall and sacrificing that .400" #. I've learned to listen to that little voice over the years. J.Rob
Click to expand...


Thank you sir. It was funny going back to a set that I did 8-10 years ago and gave up on some of those techniques. Mostly because of work and time spent. Now with better tooling some of those jobs are now easy and then just add a few things I’ve found out after that. I know bolting an intake on would help some right now at upper lifts but I gotta squeeze out a little more with the cams we now run.
 
dusterbing the peace said:
Did the flow stall, or start going backwards?
Click to expand...


Depression started going up, numbers dropped. I know a good top cut will help as will reshaping the bottom of the 70 degree cut. I was never able to cut a 70 before as I refuse to update my old stone setup because I hated it. Now I have that ability. I fell in love with this cutter as soon as I saw the .300 number. Throat is around 89 percent so I have shaping room.
 
Ok I can honestly say this is the second head that I’ve ported that actually got me so excited I started to shake, and I’m still shaking typing this. The first head was when I hit 420cfm on a set of B1’s knowing that there was more there but I was out of time, I thought. But I think this has me even more excited. I’ll tag it to the numbers above where the head as I kinda expected bogged down after .550 lift. Well tonight I rolled the 70 degree cut into the short turn for approximately 180 degrees of the seat, laid back the chamber more on the intake side between the cylinders, and cut a small 15 degree to cut. At .700 lift my numbers rolled at most 6 cfm which is nothing on an Edelbrock head. The Airwolf head rolled 15 PLUS cfm.

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I had a Victor340 shipped to me yesterday so I will post up some before and after numbers with it bolted to this head if I get a chance.
 
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