Differences between n/a bigport head and gze bigport head

[Course_Out]

Ok, it looks like I might be purchasing a 4agze head, which I had intended to be part of a mongrel bitza n/a motor I'm going to build. I was just wondering what differences there were between the n/a and sc versions of the bigport head? I searched and found out the cams are different but couldnt find any other info.

Thanks guys!

[Hen is a total nutcase]

From what I have been able to find, the only difference is the cam covers. ZE says "SUPERCHARGER" GE doesn't... suprise suprise.

EDIT after some research - Also the cams MAY be different. Apparently it is only the early "Bluetop" bigport 4AGE that has the 7.56mm lift 240deg cams.

[Course_Out]

Thanks for that hen.

The cams aren't massively important cos i intend to change them later anyway. Supercharged cam covers on an n/a car could be good for a laugh anyway, haha

[mattysshop]

cams..

GZE bigport are the same as GZE/GE smallport 232deg duration, 7.1mm lift..

GE bigport are 240deg duration and 7.56mm lift..

[Hen is a total nutcase]

Matty, I've heard that said before, though it ended up being strongly debated.

Where did you get that info from?

Hen

[mattysshop]

you can pyhsically notice the difference.. the 232's are really sharp on the top of the lobe, and the 240's are noticibly smoother.. or you can just check part numbers http://www.ae86drivingclub.com.au/forums/emoticons/smile.gif

13501-16030 - 232's intake
13502-16020 - 232's ex

13501-16010 - 240's intake
13502-16010 - 240's ex

hope that helps http://www.ae86drivingclub.com.au/forums/emoticons/smile.gif

[mattysshop]

i have cut and pasted random info in word documents over time.. but i think that there was a big write up in the tec section of club 4AG... http://www.ae86drivingclub.com.au/forums/emoticons/smile.gif

[Course_Out]

Yeah, I read on billzilla that the cams were different. Thanks for clearing that up matty.

[stouty]

If you get Drift Battle Number 7 it has a write up of all the differnt AE86 engines that people use and the differences between the engines.

[Hen is a total nutcase]

If you get Drift Battle Number 7 it has a write up of all the differnt AE86 engines that people use and the differences between the engines.[/b]
I wouldn't trust that writeup as gospel. It also seemed to pull a lot of info from Phil Bradshaws 4AGE page (though there are many others out there also with good info)

Hen

[Hen is a total nutcase]

Just did some more research and I was wrong, Matty had it right.

The bigport ZE has the 7.1mm cams. The only 4A with the 7.56mm cams is the early 3rib bluetop GE.

Hen

[slydar]

i wouldnt use a big port head for an na build up in a pink fit.