5VZ-FE Cylinder Head Port Molds - CustomTacos.com Forum
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#1 (permalink) Old 11-05-2012, 10:12 PM
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5VZ-FE Cylinder Head Port Molds

I'm porting a set of cylinder heads for my 5VZ-FE rebuild. I'll have a thread or two in the future on my progress and the finished project once completed. My plan for this thread is to share my resources that I learned this from and the photographs of the molds of the stock unchanged ports.

I originally learned about head porting from my Dad. He's ASE certified and builds FAST smallblock Ford V8's. He's ported his own cylinder heads in his garage for all the years that I remember growing up.

I read about port molds in David Vizzard's book "How to Port & Flow Test Cylinder Heads" (ISBN 1934709646) - my Dad loaned me a copy (thanks Dad!). However, it wasn't until I came across an article on diyporting.com that clearly outlined the port mold creation process and provided a list of material that is easy to obtain: http://www.diyporting.com/molds.html

To state it simply, the idea of creating port molds is to see the form of the ports in order to get a better idea of how they can be reshaped so that power increases can be obtained by reshaping the port. My port modification will be limited to removing material - I don't plan on doing any radical port reshaping or adding material.

The supplies I used to make these molds include:
1) A set of cylinder heads (this should be obvious )
2) RTV silicone - any parts store should have this
3) A paint brush. Something cheap will suffice. Don't plan on using it for anything else because the silicone will probably ruin it.
4) A release agent. I used WD40 in a pinch and I didn't have great results. I will be using an alternative release agent in the future. See the previously mentioned diyporting.com article for a better release agent.

The first two pictures are of the 5VZ passenger-side cylinder head that the molds were made from, and the silicone RTV and paint brush I used.
Attached Images
File Type: jpg cylinder_head_view.jpg (54.7 KB, 47 views)
File Type: jpg supplies.jpg (51.3 KB, 36 views)

Last edited by digitalfiend; 11-05-2012 at 10:39 PM.
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#2 (permalink) Old 11-05-2012, 10:13 PM
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Re: 5VZ-FE Cylinder Head Port Molds

Intake port molds. Top, bottom, and side views. For now, I'm going to simply post these pictures. If there's enough demand I may update this post with my plans on changing the intake ports, or, after I'm done grinding and polishing the ports, I may simply post side-by-side before and after port molds.
Attached Images
File Type: jpg intake_top_1.jpg (31.2 KB, 35 views)
File Type: jpg intake_bottom.jpg (38.4 KB, 37 views)
File Type: jpg intake_side_1.jpg (37.2 KB, 33 views)
File Type: jpg intake_side_2.jpg (43.0 KB, 29 views)
File Type: jpg intake_side_3.jpg (39.3 KB, 33 views)

Last edited by digitalfiend; 11-05-2012 at 10:37 PM. Reason: updating a placeholder to contain proper content
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#3 (permalink) Old 11-05-2012, 10:14 PM
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Re: 5VZ-FE Cylinder Head Port Molds

Pictures of exhaust port molds. Side/corner and bottom.
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File Type: jpg exhaust_port_corner_shot.jpg (32.1 KB, 22 views)
File Type: jpg exhaust_port_from_bottom.jpg (18.5 KB, 26 views)

Last edited by digitalfiend; 11-05-2012 at 10:40 PM.
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#4 (permalink) Old 11-06-2012, 04:04 AM
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Re: 5VZ-FE Cylinder Head Port Molds

Nice! I hope you get some decent gains from it. Do you plan on putting stock valves/springs/cams in it after youre done?
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#5 (permalink) Old 11-06-2012, 06:06 AM
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Re: 5VZ-FE Cylinder Head Port Molds

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Originally Posted by mitzu View Post
Nice! I hope you get some decent gains from it. Do you plan on putting stock valves/springs/cams in it after youre done?
I plan on reusing the stock valves (if they're within spec), stock cam, and new stock springs. When I last searched, upgrading the cams or valve train was too expensive for me.
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#6 (permalink) Old 11-07-2012, 06:05 AM
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Re: 5VZ-FE Cylinder Head Port Molds

That is very cool, I have never seen that done before. I will have to keep that in mind for sure.

Do post what you plan to change, the ports are actually not as bad as I thought they would be from what I can see.

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#7 (permalink) Old 11-07-2012, 07:03 AM
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Re: 5VZ-FE Cylinder Head Port Molds

just FYI, I believe you can get Colt Cams to regrind your cams for about 500 bucks
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#8 (permalink) Old 11-07-2012, 07:10 AM
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Re: 5VZ-FE Cylinder Head Port Molds

500 + shipping both ways, + new shims, it will still end up atleast 800 to get them done (the colt cams shims are crap)
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#9 (permalink) Old 11-11-2012, 09:30 PM
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Re: 5VZ-FE Cylinder Head Port Molds

what type of gains did you see?
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#10 (permalink) Old 11-12-2012, 06:53 AM
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Re: 5VZ-FE Cylinder Head Port Molds

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Originally Posted by hambone155 View Post
what type of gains did you see?
No dyno yet... truck is still in build stage... just broke the motor in...
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