v8

iTrader: (10)

Ok bought some heads 5.7 853casting, first how much CR lost when using them on 5.3,
second intake valve is 2.02 exhaust is 1.57 there PP and milled .005 can i mill them down another .010 to get my CR back to or above stock CR,
third with them milled down .015 will 7.35 rods work fine or can i use stock length rods

thanks in advance, kevin

Gunnar@Patriot

iTrader: (20)

To get the LS1 heads back to the same combustion chamber as a 5.3 head, they will have to be milled a total of approx. .030". If they are milled this much, more than likely you will need to change pushrods.

v8

iTrader: (10)

Damn that much lol, if i get them milled .030 can i use stock 7.4 push rods or will 7.35 work? thanks.

white2001s10

iTrader: (4)

Try thinner gaskets