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Do I need to port my head and run cdi ignition for 900hp

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Old May 13, 2018, 08:38 PM
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Do I need to port my head and run cdi ignition for 900hp

Okay I just want some info, Iíll be using a 6466 pte with everything else, big fuel set up curt brown 70mm mani etc etc. My question is should I port my head for this? +1mm oversize valves on stock head or actually just get the head done and leave stock valves as heard these are great for spool etc, and also at that power what ignition is needed? A very good cop or a cdi box?
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Old May 13, 2018, 09:07 PM
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Who is installing your +1mm valves? Are they going to CNC your valve seats? Watch out for shops who only install +1mm valves and not machine the seats or hand port the seats. I have a spare head that has +1mm valves. The did not cut the valve seats, so valves stuck into combustion chamber. And yes, it has bent valves.
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Old May 14, 2018, 01:06 AM
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No one yet I just wanted to know if you think I should port my head at all and run cdi ignition?
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Old May 14, 2018, 06:36 AM
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As you expect, I've seen +1mm valves and blending of bowls and knife edge splitter gives up a little spool to get more up top (see photo for built 2.0L motor on FP Black). I believe porting will tradeoff more spool for more top end.
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Old May 14, 2018, 11:41 PM
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Originally Posted by 2006EvoIXer View Post
Who is installing your +1mm valves? Are they going to CNC your valve seats? Watch out for shops who only install +1mm valves and not machine the seats or hand port the seats. I have a spare head that has +1mm valves. The did not cut the valve seats, so valves stuck into combustion chamber. And yes, it has bent valves.
Can I see, if the seats are done as should? I have a 0 miles spare +1mm valve head too and got worried about this LOL
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Old May 14, 2018, 11:46 PM
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Originally Posted by MR ArcticC View Post
Can I see, if the seats are done as should? I have a 0 miles spare +1mm valve head too and got worried about this LOL
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Old May 14, 2018, 11:53 PM
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Notice how intake and exhaust ports overlap.
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Old May 14, 2018, 11:56 PM
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Here's a CNC stock sized valve seats (opened up).
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Old May 15, 2018, 12:01 AM
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Here's what +1mm valves installed looks like.
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Old May 15, 2018, 12:03 AM
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Originally Posted by MR ArcticC View Post
Can I see, if the seats are done as should? I have a 0 miles spare +1mm valve head too and got worried about this LOL
Post a photo of your valves to compare.
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Old May 15, 2018, 12:10 AM
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Here's a +1mm installed on stock valve seats. Notice how it sticks into combustion chamber?

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Old May 15, 2018, 12:13 AM
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Here is my factory uncut valve seats with +1mm valves.


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Old May 15, 2018, 12:18 AM
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Originally Posted by Willpegley View Post
No one yet I just wanted to know if you think I should port my head at all and run cdi ignition?
For 900 whp, you'll likely need a good port job. Make sure you choose someone who knows what they're doing.
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Old May 15, 2018, 10:14 AM
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This is how it should look (ignore the paint). Notice how +1mm valves are seated inside cut?
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Old May 15, 2018, 10:22 AM
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You can make 900HP without issue on std size gsc or supertech valves and a non ported cylinder head. I wouldn't risk running higher mileage used valves. Is the porting required? No. Will it help gain some extra power? Yes.

People have made 900HP+ on a non CDI COP with healthy coils using iridium plugs gapped on the tighter side. I would probably get the CDI if budget allows.

Last edited by badev0; May 15, 2018 at 10:27 AM.
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