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Old 05-12-2004, 08:34 PM   #1
redhat778
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Now with STI VII Swap

Default Ported and Polished heads

How much of a difference would a ported and polished EJ207 make,? I understand it would flow more cfm, but what would it make in power % wise. Also for an EJ207 would Spec-C RA cams, or Jun 254s make more power. (I think Jun makes a 254 for engines with AVCS)

Thanks
-Michael
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Old 05-12-2004, 08:53 PM   #2
mr2guru
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Ron @ axis is your man for PnP heads. Ver7 heads are already great flowing heads. But there is still a big difference in intake and exhaust port flow. It really helps to get those flow numbers a little closer together in terms of CFM. Also I would pass on the 256 cams and opt for the 264 cams IMO They still offer a great idle but REALLY fatten up the mid range and provide about 800rpm later peak on HP. You can still run the stock valvetrain with 264s and can't with 272s.

HTH
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Old 05-12-2004, 09:14 PM   #3
MJU1983
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Good call Jim. And double check your heads. If you have the RA Spec C "big port" heads, they are already to the level of most basic street ports.

-Mike
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Old 05-18-2004, 12:20 AM   #4
Blu25RS02
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And would the JUN 264 cams work with AVCS heads just fine? I am hopefully swapping a Ver 7 into my car and want to upgrade the cams. Also, are the stock STi internals good enough to use with the JUN valvetrain kit? JUN says to use the valvetrain kit only with a properly built engine.
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Old 05-18-2004, 01:03 PM   #5
bryan carbon
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Mike,

What have you guys revved the stock valvetrain out to?
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Old 05-22-2004, 06:43 PM   #6
gpatmac
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Quote:
Originally posted by bryan carbon
Mike,

What have you guys revved the stock valvetrain out to?
bump
Quote:
Originally posted by Blu25RS02
And would the JUN 264 cams work with AVCS heads just fine? I am hopefully swapping a Ver 7 into my car and want to upgrade the cams. Also, are the stock STi internals good enough to use with the JUN valvetrain kit? JUN says to use the valvetrain kit only with a properly built engine.
b-bump
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Old 05-22-2004, 06:45 PM   #7
Blu25RS02
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Quote:
Originally posted by gpatmac
bump

b-bump
LoL, so is that a yes to my questions?
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Old 05-22-2004, 07:24 PM   #8
MJU1983
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Quote:
Originally posted by bryan carbon
Mike,

What have you guys revved the stock valvetrain out to?
What do you mean when you say stock? Never occurred to me to try. Upgraded ones 9700 RPMS.

-Mike
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Old 05-22-2004, 07:36 PM   #9
MJU1983
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Quote:
Originally posted by Blu25RS02
And would the JUN 264 cams work with AVCS heads just fine? I am hopefully swapping a Ver 7 into my car and want to upgrade the cams. Also, are the stock STi internals good enough to use with the JUN valvetrain kit? JUN says to use the valvetrain kit only with a properly built engine.
Yes they will work. Will your AVCS work? Nope. Need to use WRX sprockets.

I would recommend a single spring upgrade and titanium retainers. Available from several vendors, gruppe-s has some nice packages.

-Mike
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Old 05-22-2004, 07:40 PM   #10
Blu25RS02
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Yeah, i was planning on the JUN valvetrain kit, with springs and retainers. And yes, my AVCS will be hooked up, all wired and working, plus smog legal, i hope, lol. So tell me a little more about having to use the WRX sprockets please, i dont quite know what u mean. Thanks.

Patrick
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Old 05-22-2004, 08:01 PM   #11
mr2guru
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The AVCS sprockets with non-avcs cams (JUN) are timed a few degrees different. Not good. So...you have to use non-avcs sprockets to get the timing right if your using JUN cams.

So...JUN 264/272 cams=No AVCS

I don't know that I would plan on being smog legal with 264 or 272 cams....there is A LOT of overlap in duration that isn't friendly when it comes to emissions. You might get by on the rollers/sniffer with your stock exhaust and all three cats installed. But I don't know if has been tried either.

What type of AVCS heads do you have? The stock RA/spec-c heads are good for at least 8500rpm on stock RA cams. Although those cams don't really make any more power that high.
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Old 05-22-2004, 08:06 PM   #12
Blu25RS02
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I-Speed has successfully smog ref'd a JDM Ver 7 WRX engine with AVCS running perfectly, mind you that isnt an STi, but still. They are very confident that this Ver 7 STi engine will pass smog as well. So I wouldnt put the cams in until after the smog ref inspection.

As far as the heads that I have, they will be stock JDM Ver 7 STi heads, not the RA Spec C, unfortunately. But JUN being such a big name company in Japan, I would think that they would have a set of cams for the AVCS heads as well. Maybe not, i could most certainly be wrong.
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Old 05-22-2004, 08:16 PM   #13
mr2guru
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Oh stock Ver7 STi will smog fine with cats....but not with JUN cams. Also the STi ver7/8 ecu passes an obd-2 check indicating "all systems ready"

The only JUN avcs cams are 256s and probably not worth the $1000-$1200 when RA cams are the same duration and lift.
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Old 05-22-2004, 08:27 PM   #14
Blu25RS02
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Yeah, its a stock Ver 7. But for the Jun 256's, dont you get the whole valvetrain kit? As in the cams, springs, and retainers like the 264 and 272 kits come with? Or would the Ver 7 vavle springs and retainers be good enough to rev out a little further? And if the JUN cams dont come with the whole valvetrain kit, then yeah I would rather just try and find some RA cams, but those, I would imagine, are rather hard to come by.
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