JDM Big port heads
 

Does anybody know what JDM Models had the avcs big port heads?

Not sure where to post this!

version 8

Thanks CJ, I shall start looking!

It's only some not all the are big port

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!

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

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!

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
http://i1205.photobucket.com/albums/...6/25999f1e.jpg

replacement heads
http://i1205.photobucket.com/albums/...6/c54ca2de.jpg

Any ideas!?!

http://bbs.22b.com/forums/showthread...ght=port+heads

Makes me think they are big port??

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 ;)

[QUOTE

Couldn't of found that out on Facebook! ;-)[/QUOTE]:rofl::10:

Ha ha! Ok maybe I could but I'd have to get them to be my friend first!?

You hardly got an answer on here either :D

That is a very good point!

Oh well I've had a result so can't grumble!

A great result mate :)

no because every1 was on facebook :grin:

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
http://i1205.photobucket.com/albums/...6/64b87e27.jpg

BIG port
http://i1205.photobucket.com/albums/...6/0165c018.jpg