Holy coincidences Batman, I just emailed Bullfrog yesterday with a list of questions about their hemi piston. Here's what I asked:
1. How much does it weigh?
2. Does your company manufacture it in-house or do you just machine a
blank forging?
3. If you are starting with a blank forging then which company produces
the blank?
4. Your website states that this piston works with the Arc billet rods
that are longer than stock (+0.020", etc.) Is a longer than stock rod
even necessary with this piston?
5. Some dimensions would be nice, can I get a CAD drawing of this part?
6. Are there cam lift and duration limits when considering piston to
valve clearance?
7. Is there enough meat in the crown to allow for further clearancing
the valve reliefs?
8. Will the existing valve reliefs accept larger than stock valves?
9. What is the volume of the pop-up in cc's?
Hopefully they get back to me with some answers. Prior to discovering that this piston is available I was considering going with the Arc +0.020" rod, a 0.040" head gasket, and having the head milled 0.030" to achieve an ~10.5:1 static compression ratio. The Bullfrog piston would eliminate the need for milling the head and probably end up costing more. So why would someone want to do this? Here's why:
Mopar - Chrysler 426 Hemi engine
It's simple. A real hemi needs a pop-up piston. :smile:
-Ray