im so confused
ok im lookin at a set of ported and polished 243s
and a zo6 cam would this be an alright set up

 

For an LS1? lol, what engine?

 

O SORRY ITS A 5.3 in an 03 avalanche i was tired when i posted that

 

The 243's will lower CR and you will lose a bit of bottom end torque as a result UNLESS they are milled down a bit to decrease the larger (than 5.3L) combustion chamber. Also for an NA application you would want a lager cam to take more advantage of the heads you just spent a ton of cash on. Then you'd need to swap intake manifold to take advantage of the cam, heads....you get my drift.
What other mods do you have?
I wouldn't worry about heads until you've got all the basic bolt ons (including cam) done. Just my opinion.

 

well i can get them and the injectors for 600

 

They have been milled .055 and they come with custom 7.300 pushrods.

the bowls have been CNC machined; the runners and around the valve stems have been hand ported.

compression ratio on a 5.3---- 10.66:1 and that is with a stock 6.0 gasket at .054 thickness. They are 57cc combustion chambers.

 

Then you should get a nice bump up with them. I'd still rethink the cam.

 

any suggestion....
i will have lts and a ory
transgo shift kit
super hold 1-2 3-4 servos
cai
8.1 injectors and eventually some N2O
4.88 gears with 37inch tires
o and i havent decided on a stall

 

go with a 216/220 .560 .560 114lsa trickflow from summit for $269.99 shipped. 600 lift springs. youll have the pushrods of ya buy the heads wont ya....i got the 243 heads on my 5.3 so when i get that cam in it i will let ya know how my buttdyno like it...lol.. i thought about the zo6 cam but i fig out what al i was gonna do and thats not enough lift for me...plus i wanted to hear at least a lil bump..lol

 

hmmmm sound nice does it have the same size cam circles as stock???