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Author Topic:   Porting Cleveland Heads?
clevelandstyle
Gearhead

Posts: 1098
From: Connersville, IN
Registered: Jul 2001

posted 12-31-2001 11:22 AM     Click Here to See the Profile for clevelandstyle     Edit/Delete Message   Reply w/Quote
I've started porting my '71 4V heads. I've been doing a lot of work in the bowls and on the exhaust roof and short side radius. My problem is, I don't know what to do with the valve guide area. Do I cut it out, Tear drop it, radius it, leave it alone? What should I do? Do I do the same thing for the intake and exhaust?
Back in the spring, I got knew bronze guides installed. I'm not sure I should just cut them away. I also drive on the street a little, and I don't want to give up all of my valve support, but the main concern is drag racing.

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Just Strokin
Gearhead

Posts: 754
From: Tuscaloosa, Alabama
Registered: Dec 2001

posted 12-31-2001 11:34 AM     Click Here to See the Profile for Just Strokin   Click Here to Email Just Strokin     Edit/Delete Message   Reply w/Quote
Exhaust, Tear drop some and definately radius the ends. Cut the bronze guides flush with the cast guide. Leave as much support as you can and feel comfy with.

The intake I would radius and again cut the bronze guid flush with cast guide.

The exhaust is where you need to concentrate since the 4v has huge ports and flows better than the exhaust can keep up with.

Just my 2 cents on this, others may have better ideas too.

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kid vishus
Gearhead

Posts: 6220
From: middle of NC
Registered: Oct 2000

posted 12-31-2001 11:42 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
Here's what I did, and it may not be right, but at least it gives you an idea. On the intakes, I tapered the guides, made them smaller at the bottom, leaving material at he top for strength, but I also made them more of a wing shape to try and promote flow around them. I was told there is a bad dead air spot right behind them, so its best to try and make the air go around and not flow in that area anyways.

On the exhuast, I narrow them up as much as possible, leaving most of the material at the top agian, for support. Also, on the exhuast, I spend alot of time widening the port, knocking down the bump on the head bolt side to give the flow a straighter shot out of the port. I also try and widen the mouth of the short turn.

I am definately not a professional at this, but my 4v heads have responded well on the flow bench , at least on the exhaust side with those mods.

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clevelandstyle
Gearhead

Posts: 1098
From: Connersville, IN
Registered: Jul 2001

posted 12-31-2001 11:54 AM     Click Here to See the Profile for clevelandstyle     Edit/Delete Message   Reply w/Quote
Yeh, I have been working on the head bolt bump, and the short radius.
I have looked in the arcives and gotten a lot of info about what you have done in the past. I just didn't see anything about the guides. It doesn't sound too bad though.
My heads won't see a flow bench. It's just not in the buget. So, what I do is what I get.
Thanks.

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