What CR ratio with -11.5 cc dish

[Oiljunkie]

Can anyone tell me what the CR would be with these pistons and OE head gaskets

Thanks Jay

 

[racecougar]

We'll need more information to be accurate. What is the compression height, diameter at top ring land, and distance from top of piston to top ring land for those pistons? Has the block been bored or decked? Heads resurfaced?

Just throwing in ballpark numbers, stock bore and deck, pistons 0.008 in the hole, you'd be looking at just over 9:1.

 

[Oiljunkie]

i sent the card to the Machine shop with the pistons but they are 11.5cc diamonds stock deck and bore and stock heads i think top ring land is .275 it says it makes 8.7 cr with 55cc heads we have 54's correct?

 

[racecougar]

Part #30001 from their catalog? http://www.diamondracing.net/pdf/Ford-Section.pdf

Those should put you at ~8.81:1 CR.

 

[Oiljunkie]

Perfect thanks!