Ported some Holley Systemax II heads. Have some questions. - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
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post #1 of 7 (permalink) Old 05-05-2010, 10:37 AM Thread Starter
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Ported some Holley Systemax II heads. Have some questions.

I plan on getting a cylinder flowed so I can go with a new cam. But I was wondering what you thought about this bit of material behind the guide on the cylinder side. Should I keep it, or grind it out? I can venture that taking it out would cause a low pressure space behind the valve. But on the other hand, the collision of air there after might help with swirl. What do you think?

I bought these in 1999. As they are in the pix, the Intake measures 175CC's, and the Exhaust is 72.5CC's. I gasket matched the exhaust to a Ford gasket by squaring the bottom, and sides, and then raised the top for a better straight shot out of the port.

My motor is a 9:1-306 with a 5-speed, and 3:73 rear gear. I want a cam that will be mostly for street, but will turn a good 1/4 mile time every once in a while. Have any sugestions on a good cam?















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post #2 of 7 (permalink) Old 05-05-2010, 12:43 PM
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Re: Ported some Holley Systemax II heads. Have some questions.

leave it in there.....

also if by chance taking it out helped swirl thats the last thing you want.just say no to swirl.

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post #3 of 7 (permalink) Old 05-05-2010, 05:20 PM Thread Starter
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Re: Ported some Holley Systemax II heads. Have some questions.

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leave it in there.....

also if by chance taking it out helped swirl thats the last thing you want.just say no to swirl.

Does swirl kill velocity?
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post #4 of 7 (permalink) Old 05-06-2010, 09:32 AM
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Re: Ported some Holley Systemax II heads. Have some questions.

Do those heads have the raised exh. port? Right now they seem to be more than enough flow for a 306. Try an X303 Ford cam 224 @.050 .542 lift on a 112 split, straight pattern, I always thought this would be a good street/strip cam with quality idle.
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post #5 of 7 (permalink) Old 05-06-2010, 11:19 AM Thread Starter
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Re: Ported some Holley Systemax II heads. Have some questions.

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Do those heads have the raised exh. port? Right now they seem to be more than enough flow for a 306. Try an X303 Ford cam 224 @.050 .542 lift on a 112 split, straight pattern, I always thought this would be a good street/strip cam with quality idle.

They're advertised as raised .400".

I'm definatley up for cam sugestions. What is the power band of the X cam?
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post #6 of 7 (permalink) Old 05-06-2010, 09:45 PM
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Re: Ported some Holley Systemax II heads. Have some questions.

They look VERY good as is. John--Las Vegas.
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post #7 of 7 (permalink) Old 05-07-2010, 09:08 PM Thread Starter
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Re: Ported some Holley Systemax II heads. Have some questions.

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They look VERY good as is. John--Las Vegas.
Thanks, but they do need a little more work. I think I can finish them up tomarrow.
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