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  #1  
Old 26-07-2012, 06:44 PM
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Default JDM Big port heads
Does anybody know what JDM Models had the avcs big port heads?

Not sure where to post this!
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Last edited by Tomma; 26-07-2012 at 06:45 PM. Reason: typo
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Old 26-07-2012, 07:57 PM
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version 8
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Old 26-07-2012, 07:58 PM
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version 8
Thanks CJ, I shall start looking!
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Old 26-07-2012, 08:58 PM
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It's only some not all the are big port
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Old 26-07-2012, 09:17 PM
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Oh right ok, I've had a look on nasioc and there are a few threads about which ones are and aren't big port.... just trying to piece it all together!
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Old 26-07-2012, 10:42 PM
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Interestingly there is a lot of debate about if the big port are worth it....

It appears to be the difference of low from inlet to exhaust that are critical, look at this for some interesting reading
http://www.cncheads.co.uk/?p=786
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Old 26-07-2012, 11:13 PM
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Cheers, interesting and the gains look pretty impressive..... I had looked at these before but the cost put me off a bit to start with especially if you don't have good condition heads to exchange!
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Old 07-08-2012, 02:04 PM
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Does anyone know what or if there are any specific codes for Big Port Heads? I've had a look around and it appears that heads starting with RHT and LHT (maybe V8) are definitely big port heads but I've also seen on a few other places that heads starting with RHS20V and LHS20V are also big port but opinions differ!

I had heads starting with RHH on my bug which I think are 2.5 heads but the replacement ones I got have rhs20v and lhs20v on them..... there is a massive difference in the intake ports.....

old heads


replacement heads


Any ideas!?!
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Old 07-08-2012, 05:51 PM
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http://bbs.22b.com/forums/showthread...ght=port+heads

Makes me think they are big port??
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Old 08-08-2012, 11:21 PM
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After looking through lots of threads on various forums I've come to the conclusion and identified these heads with the casting Id numbers as definitely being Big Port Heads!

Couldn't of found that out on Facebook!
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Old 08-08-2012, 11:37 PM
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After looking through lots of threads on various forums I've come to the conclusion and identified these heads with the casting Id numbers as definitely being Big Port Heads!

Couldn't of found that out on Facebook!
Being that Andy F, RCM, Engine tuners Martyn and Steve Darley are on there to name a few.... Err yes you could
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Old 08-08-2012, 11:47 PM
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[QUOTE

Couldn't of found that out on Facebook! [/QUOTE]
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Old 08-08-2012, 11:47 PM
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Ha ha! Ok maybe I could but I'd have to get them to be my friend first!?
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Old 08-08-2012, 11:52 PM
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You hardly got an answer on here either
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Old 08-08-2012, 11:53 PM
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You hardly got an answer on here either
That is a very good point!

Oh well I've had a result so can't grumble!
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Old 08-08-2012, 11:55 PM
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A great result mate
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Old 09-08-2012, 12:07 AM
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You hardly got an answer on here either
no because every1 was on facebook
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Old 10-08-2012, 04:00 PM
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A great result mate
As luck goes I'd already found a set of Big Port Heads prior to finding this out so these are still for sale!!

Quite a difference in the ports......

Small port


BIG port
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