What I'm starting with:
- 3-rib 4A block
- Stock bigport head
- Upgraded 20v oil pump, OEM water pump, all gaskets, etc
- Stock ECU
Upgrade/performance parts planned so far:
- Tomei 16v poncams (264 duration, 8.15mm lift)
- HKS valve springs
- Replacing all engine fasteners with ARP studs/bolts (head, main studs, rod ends)
I found that one of the OEM pistons already has bad ringlands, so I'll probably replace all four. The problem is I cannot find OEM bigport pistons anymore...
If I swap in smallport pistons, that means the rod pins and crank diameter changes as well right? Should I just buy aftermarket pistons that fit the 18mm wrist pin like Wiseco or Toda pistons?
I'm not looking for crazy power with this build, just a mild increase and reliability because it's a street car, not a race car. I would be fine swapping in different pistons, but I'm afraid I'll no longer be able to use the stock ECU at that point, and I want to avoid getting too deep into customization if possible.
Thanks in advance!