The ZL1 Speed Shop has a very close working relationship with most, if not all, of the major piston factories in the USA. Also, we have a direct relationship with some of the top custom piston sales and design engineers, some who have been in the industry for many decades and were involved with the founding of companies such as JE, Racetec and others. 
If you cannot find a shelf part, the ZL1 Speed Shop can offer many different levels of semi-custom  to full blown custom pistons in any bore size, compression height,  cusom ring packs from 1.2,mm to .043, and others, custom volume, dome or dish design, various valve angles, with features such as full skirt, box skirt, heavy weight thick deck and land design with upgraded pin for power adder applications or light weight design piston and pin for lower power applications. Upgrades can be added such as gas porting, Poly-dyn or Calico crown or skirt coatings, Gapless ring technology, etc etc. If you do not find what you are looking for on our site "buy it now". Please contact us directly.