Big Port To Small Port Conversion???

[ae8616v]

Can anybody tell me what it takes to convert my 4age big port to small port? I got the head, intake manifold and the ecu and lume...But will my big port headers fit straight to the small port head, and any other things I may need? And if I were to put higher comp pistons, what else might have to be done??? I want to get the most out of my 4age and to have peice of mind that it wont be dieing on me anytime soon... after i have built it ofcorse. Any input on this matter would be great. I will also be make my build thread to share my 86 with everyone soon, once I pull my finger out and get some pics haha. Thanks.

[Stain]

you should really get the smallport bottom end as well...

for one, the block will be a stronger 7rib version, it'll have oil squirters in the cylinders and a external oil line that connects up to the head.

[Sam-Q]

apparently the bigport crank isn't fully counterbalanced as much as the smallport/20v as well

[Slimer86]

On this same topic, does the RWD waterpump housing, transfer pipe and top head outlet pipe fit without any issues on a small port?
I am having an issue where it appears the transfer pipe is ~5-6mm too long?
O-rings taken off both ends, made sure it was sitting flat on both the rear waterpump thermostat housing and the head outlet.
Overall length of transfer pipe is : 67.8mm

Water pump thermostat housing is from ADM 4ac, transfer pipe from the 4ac, and the head outlet from JDM AE86 4ag.
Help would be greatly appreciated.

[Stain]

4AC bypass pipe is too short to use on a 4AGE.

But all 4AGE RWD water items fit on a Smallport no worries.

[Slimer86]

Toyo diy says its 2 different part numbers between the JDM AE86 and ADM AE86 water outlet pipe.

16268-16010 PIPE, WATER BY-PASS, NO.1 JDM AE86

16268-15010 (05/1983 - 02/1985) ADM
16268-15011 (03/1985 - 03/1987) ADM

Ok, so I assume that my ADM water by-pass pipe is too long and won't fit.
Can some one please measure the length of a JDM one for clarification?
Thanks

[Stain]

sorry, yeah. too long.

RWD 4age bypass is 5.3cm

[Sam-Q]

I forgot what mine where in the end:

16V OEM Replacement Bypass Pipes:

http://www.ae86drivingclub.com.au/dcimages/2/5/2/68828.jpg