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Author Topic: Head Hierarchy?  (Read 23346 times)
Foz
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« on: October 27, 2015, 07:18:48 pm »

Hey all,
Is there such a thing as a list that places heads in an ascending hierarchy?
I ask as there are many who may be a little overwhelmed by the rafts of information that is brandied about at times.  Though it may be just asking how long is a piece of string and also the pushing of favourite brands and denouncement of others I think it may be a handy way for newbies to learn and set goals etc.
Cheers
Steve
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Outlaw Bill
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« Reply #1 on: October 27, 2015, 08:01:31 pm »

You want inline or canted valve style heads?
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« Reply #2 on: October 27, 2015, 08:42:30 pm »

Do both and where they stand.
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knucklefux
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« Reply #3 on: October 27, 2015, 08:53:30 pm »

A *very* elementary way to evaluate heads, assuming accurate flow bench data, is that the HP limit of a given head is twice the cfm at the lift you're using.

Example: your cam has a gross valve lift of .500".  A head that flows 150 cfm is good for about 300 hp, and the hp peak will depend on the stroke of the engine...the longer the stroke, the lower the peak hp rpm.

This is a very rough guide, and doesn't take into account a huge number of variables like compression ratio, chamber design, etc.
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« Reply #4 on: October 27, 2015, 09:04:41 pm »

Inline valve - Edelbrock Victor 2, Edelbrock Victor, TFS High Port, AFR 225, TFS TW 205, AFR 205, TFS TW 185, AFR 185.

Canted valve/Yates/Cleveland style - Edebrock SC1, FRPP D3, Blue Thunder 4.3, FRPP SC1, FRPP Yates C3H, Brodix Neal, Blue Thunder 3.6, FRPP Yates C3, and CHI.
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289nate
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« Reply #5 on: October 28, 2015, 12:42:00 am »

That's an excellent break down Bill.
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scienceguy
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« Reply #6 on: October 28, 2015, 06:03:47 am »

It all depends upon application.  The hierarchy listed by Bill is great for 400+ cubic inch, high compression, high rpm engines....   but doesn't apply to most of what we would build for our cars. 

What are you wanting to build?
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dennis112
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« Reply #7 on: October 28, 2015, 06:03:50 am »

Yes. A very nice list of the "decent" aftermarket heads that are out there.
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Foz
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« Reply #8 on: October 28, 2015, 07:30:23 am »

Thanks so much for the replies fellas. 
Bill, I did not know there were so many options in the canted range. 

Knucklefux, I like that simple formula.

Scienceguy, I am interested in the whole range really and not pertaining to a single build and with that in mind would appreciate knowing the lower end of the scale as well including factory.

Cheers
Steve 

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Bam54
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« Reply #9 on: October 28, 2015, 10:07:19 am »

I would also add Victor Jr, RHS, and Brodix has some nice inline heads.

Bam
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Foz
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« Reply #10 on: October 28, 2015, 05:12:42 pm »

Thanks Bam54,
Where in the list would they be located?

I think this is gonna be a big list. Smiley

What about Ford X, Z, etc?

Cheers
Steve
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CDW6212R
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« Reply #11 on: October 28, 2015, 05:16:13 pm »

The canted valve SBF heads will be the best, but those first come down to the choices for intakes, exhaust, and front accessories. Those differences dictate most people's decisions about those heads. The engine is totally different externally because of it.

They also cost more for the given application. If the choices for intake/exhaust etc, make it too much trouble, then pick an inline head.
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« Reply #12 on: October 28, 2015, 05:38:38 pm »


Where in the list would they be located?

What about Ford X, Z, etc?

Many of these heads are available in many different sizes and configurations, which would change their "ranking" on any list. Even among heads that appear more/less the same, there can be huge differences.

As for the Ford heads. The Z heads are a High Port copy, and use offset rockers. IMO, just a pretender. If you are after that style head, get real High Ports.

The X heads are a low end head and will likely be near bottom on anyone's list. Only available in pedestal mount and have a weird valve guide boss that requires machine work to use any decent spring. They also have some other flaws that make them less desirable.

But whatever your goals are will dictate the type of head you need.
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Doing more with less, or something like that.
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Joel5.0
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« Reply #13 on: October 28, 2015, 07:39:50 pm »

TFS TW heads are not inline heads. TFS High Ports are, but TW heads are not.
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« Reply #14 on: October 28, 2015, 08:55:12 pm »

TFS TW heads are not inline heads. TFS High Ports are, but TW heads are not.
I lumped them in there to prevent confusion.
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www.TeamZmotorsports.net

TeamZmotorsports 25.2 outlaw drag radial stock suspension 1991 Mustang
Thank You to the following for their help
TeamZmotorsports
Marcella Manifolds
Schoneck Composite
Ultimate Converter Concepts


"Stupid is as stupid does", "You can't fix stupid"
"Common sense is not common"
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