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, 10:33 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 or keep it. 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 05-07-2010, 08:46 AM
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Re: Ported some Holley Systemax II heads. Have some questions.

Those look pretty nice. What intake, converter, gear and transmission are you running?


6.19 @112 1/8 mile; [email protected] 1/4 mile Texas Motorplex Fun Ford weekend 2012
NEW COMBO: 5 Speed is gone. 4R70W with BE controller.E85, solid roller 13:1 compression.
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post #3 of 7 (permalink) Old 05-07-2010, 09:07 PM Thread Starter
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Re: Ported some Holley Systemax II heads. Have some questions.

306ci-9:1. Systemax II upper, and lower. 70mm tb, 75 maf, 30# inj, 190 lph. Systemax II heads mildly ported. 1-5/8 BBK longtubes to a Dr. [COLOR=blue !important][COLOR=blue !important]Gas[/COLOR][/COLOR] X, out a Dynomax Ultraflo cat back. No Catz. Tremec 3550, 3:73 rear.

I think I'm going to run a Comp Cams XE274.
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post #4 of 7 (permalink) Old 05-08-2010, 08:35 PM
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Re: Ported some Holley Systemax II heads. Have some questions.

Running that same cam in a 302 on my sons car. It works very well and sounds great.


6.19 @112 1/8 mile; [email protected] 1/4 mile Texas Motorplex Fun Ford weekend 2012
NEW COMBO: 5 Speed is gone. 4R70W with BE controller.E85, solid roller 13:1 compression.
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post #5 of 7 (permalink) Old 05-09-2010, 07:07 AM
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Re: Ported some Holley Systemax II heads. Have some questions.

Leave them there.
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post #6 of 7 (permalink) Old 05-11-2010, 08:23 AM
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Re: Ported some Holley Systemax II heads. Have some questions.

Did you use a carbide cutter that you would use on iron heads to do your port work and 60 grite cartrige rolls to polish it out.This what I use on my iron heads and I have a set of holley heads I want to port out as yours.
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post #7 of 7 (permalink) Old 05-11-2010, 08:02 PM Thread Starter
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Re: Ported some Holley Systemax II heads. Have some questions.

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Originally Posted by lexus View Post
Did you use a carbide cutter that you would use on iron heads to do your port work and 60 grite cartrige rolls to polish it out.This what I use on my iron heads and I have a set of holley heads I want to port out as yours.

Yeah. Pick up some cross buffs too. Get the small 3-ply (HD) ones. 1 will pretty much do the whole job. Use some WD40 with the cross buffs, you'll get a finer polish. The smaller size lets you get in the cracks where the bigger 1-1/2 sizes can't.

Or you can cut the big ones down with some tin snips like I did.

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