317 Heads with Comp 918 Springs

[r.barn]

Those heads have the 4.0+ bore? Wouldnt work on my 4.8 with the 243 heads, right?

243 and 317 are same,
317's just have bigger combustion chamber for lower compression

[Mang213]

I thought they were the same, but wasnt positive. So the bore size isnt an issue, since these heads came from a 6.0? I thought the LQ4 had larger valves than the 4.8

[408.Luke]

BUMP for some good heads

if u put 317 on a 4.8 (like i am ) u will have about 8.5:1 compression which is no good especially N/A

[Mang213]

It will be a good idea when I turbo this thing tho. But yeah this engine already has somewhat low compression anyways, compared to the other LS engines. I think mine is only 9.1:1, not sure but I think thats what it is

[Mang213]

yep just looked it up in one of my books. 9.1:1

[GasGuzzler]

The 6.0 does have bigger valves than the mini 4.8 and the medium sized 5.3 but that doesn't mean the heads are different (other than the seats)

[Mang213]

sounds like a great deal for sure, wish i was at that point right now

[bulldog5.3]

Sorry Sold Today!!!

[Mang213]

Glad to hear it, bud