I have a LM7 and a good buddy of mine will be giving me a set of 243 heads and LS2 cam out of a tbss specs are 204/211 .520/.520 116. question is what gains will I see I will more than likely be adding headers and a tbss intake when I do this install as well.

 

Head will lower compression, so you will probably lose power. They do flow more, so if you mill them down you will be good to go.

Cam is not direct swap. The timing cover would have to be switched to one with a sensor. Cam sensor wires will have to be extended to said timing cover. Will also need new timing gear for work with sensor. Cam is not worth it.

 

You're not going to lose power if you don't mill the heads. If you are keeping an NA set-up, then you can mill them to 59cc to gain even more power.

 

How do you figure? The stock heads on his LM7 are 61.33cc chambers, stock 243's are 64.6cc chambers.


You will need to mill the heads about .025-.030 to get your compression back up.

I'm running 243's milled .030 with a .040 thickness head gasket and my CR went from 9.5 to 9.89 assuming a 60cc chamber.

 

yeah i forgot all about the sensor being on the front guess ill I wont be doing this swap then. about how much would it cost to mill the heads down?

 

should not be more then 20 buxs a head at a good shop...

which head gaskets are you running with the 243 heads ??

 

$100 to have my 317s milled .035 the shop did the intake side as well so it would seat properly