8Mike9

I wish I had a working digital camera, but...

First my mistake...I had new exhaust seats installed, I should have had them cut for 1.60's (for the price I paid..never mind) but anyway....

What I noticed is the short side radius was contoured very well..i/e minimal transitions on all intake ports, so I did very little work there.

Question...should I taper more of the stock casting away?

I raised the roof of the intake ports fairly evenly based on my intake gaskets (1204's I had laying around).

Any advantage to taking more out? I can't think of any.

On the floors, I just removed the casing irregularities.

In the bowls, I didn't taper the seats, but rounded and profiled them.

Is this a mistake that will it hurt anything?

I also removed all "bumps" behind the guides and opened up and profiled to the walls, should be good there. The rear of the intake seats were contoured as well from the bowls to the seats...on the exhaust seats, I matched the casting "lip" to the seat diameter.

Should I profile the sparkplug bosses?

I'm just loking to match the heads to the flow of my Accel base and runners...least get them closer, so I'm looking for about 220 or so on the intake side.

Anyone whose flowed these heads, how much needs to be done on the exhaust ports to keep a good ratio...based on about 220-230CFM flow on the intakes? I've contoured and smoothed everything on the exhaust, just need to know if I need to open anything up more.

I realize it's difficult to answer a lot of the above without seeing what I did, but the above descpritions should give ya an idea.

Man, I should make a flow bench

Thanks.

rhuarc31

Without seeing what you did it's hard to say. Big areas are unshrouding the valves by relieving around the outside edges of the chamber, the short side radius should be a nice smooth radius. And some people disagree with me, but i found the pushrod pinch to be pretty restrictive in these heads, so I oppened 'em up a bit. 80% of your intake flow is what you should aim for with your exhaust. You can always crutch this with a dual pattern cam of course.

rhuarc31

Oh forgot, I formed the exhaust ports to a D shape like the aluminum corvette castings, found a lot of flow there. Make sure you don't lower the floor any though.

8Mike9

Rhuarc...glad you answered...infact your posted numbers for the Stage 1 job you did, is what got me started on these.

Did you D-shape the exhaust in stage 1?

Also, did you unshroud with the 1.94's in Stage1?

I'm shooting about 220/160 for IE flow, I'd like to get a close as possible before I have them flowed.

Might add I'm looking for the above numbers around .5 lift

Thanks.