Hello Everyone,

I have a 2013 Silverado crew cab with a 5.3 LMG which I'm about to take apart and add a DOD delete,TSP Stage 3 high lift VVT cam and PRC ported heads milled to 60cc's. I already have TSP 1 3/4" headers, Speed Engineering true duals and a true trac w/ 4:10 gears. Here's the problem I'm having I shouldn't have had the heads milled so much and just used a thinner head gasket. My stock 243's are 65cc's and the motor has 9.6:1 compression but with the new heads with .051 head gaskets I dont know what ratio I'm going to have and if I'll have PTV clearance issues. Would anyone have some more experience about this issue I'm having. Thank you

 

You should be able to look up the stock piston to valve clearance. Then you subtract the amount you took off the heads, the amount of extra lift you added, and the amount of gasket thickness you lost. That should get you close on PTV clearance.

For compression ratio, summit has a good calculator. just fill in the blanks.
https://www.summitracing.com/newsand...ion-calculator

 

thank you