Im doing a 4.005 bore l76. I want to run a dish piston that will get me around 10:5-1 to 11:0-1 with my PRC 2.5 5.3 heads. I believe they are 62CCs. But I want to be able to replace these heads with some 70ishcc heads down the road for boost. Assuming around 9:5-1 is what Il want to shoot for. So basically I want to run high compression N/A for a little while to get the truck going then Switch to lower compression for boost later on with the same short block. Can it be done?

 

With stock head gaskets and deck height, I calculate with a 6cc piston:
62cc heads = 10.62:1
70cc heads = 9.72:1
72cc heads = 9.52:1

an 8cc piston:
62cc heads = 10.38:1
70cc heads = 9.52:1
72cc heads = 9.33:1

 

your the man, Thanks

 

Whats the best 4.005 or 4.030 piston for a stock stroke? Everyone I find is for a 4.000 crank. Im staying with the stock 3.622

 

using stock rod or 6.125?

 

callies 6.125

 

I am using Wiesco -11cc 4.030 pistons in mine on 6.125 K1 rods and stock crank.

 

yeah the k1's are nice