power gain with 243 heads over 706
#2
TECH Junkie
iTrader: (28)
The gain would be from the slightly larger intake valves of the 243s.... but unless you milled them you would lose a little compression as the chambers are 64cc vs. 61cc.
http://houstonperformancetrucks.com/...h-flow-numbers
Once you take into account new head gaskets and head bolts/studs it may not be worth doing unless you are going for big power numbers and need LS9 head gaskets/studs to begin with.
http://houstonperformancetrucks.com/...h-flow-numbers
Once you take into account new head gaskets and head bolts/studs it may not be worth doing unless you are going for big power numbers and need LS9 head gaskets/studs to begin with.