u need to decide which crank, then u can work out which rod & piston u need that work with a good ratio 1.7 plus is good ratio.

measure exhaust port size match the flange & suit pipe size or slightly larger pipe

thats none as a square bore set up bore & stroke the same good combo works well. bigger bore with shorter stroke tend to rev harder .rod ratios std a12 1.66 / a14 1.72 /a12rod with a14 stroke 1.57 longer the rod the better.
a14 piston comp height 32.5mm a15 are 30mm so are u using a a14 crank or a15 different strokes different pistons.

which one a14 or a15 different in stroke

i have exhaust flange plates semi finished to make your own extractor.

a12 rod 121.5mm/17.45 pin & a14/15 rod 133mm/19mm pin {11.5mm different in length]u would need to bore out little end to 19mm but then piston to short.

pm sent

A15 77.5/78mm new "FLAT TOP" cast pistons/rings balanced, A15 Conrods,are bead blasted/close&honed/little ends are bushed{floating pins}/pin buttons/balanced. & new rods bolts. Have used this package in race engine to 8000rpm so far so good. NOTE; may need to valve relief pistons depending on cam lift. Exchange rods will apply.
open for interests

Attach file:

---

  GetAttachment.aspx.jpg (23.71 KB)

i have heads all different types std/ported what are u after. call me ernie 0412 864 741

pm sent