6.0L LQ4/LQ9 with 853 LS1 heads...
#1
On The Tree
Thread Starter
iTrader: (7)
Join Date: Sep 2008
Location: Lakeland, FL
Posts: 155
Likes: 0
Received 0 Likes
on
0 Posts
6.0L LQ4/LQ9 with 853 LS1 heads...
I see the factory compression ratio for an LQ9 HO motor (with flat top pistons) used in trucks such as the Silverado SS is 10:1. So how much compression will I gain from putting on stock 853 heads? If this will be under 11:1 compression, how much milling would it take to get there, assuming I'm using a standard thickness head gasket? If I decide to mill down the heads to achieve 11:1 compression, would I have to flycut the pistons for PTV clearance?
edit: cam of choice will be a torquer 2 cam with stock 1.7 rockers...
edit: cam of choice will be a torquer 2 cam with stock 1.7 rockers...
#2
On The Tree
iTrader: (5)
Join Date: Oct 2007
Location: Lake Worth, FL
Posts: 177
Likes: 0
Received 0 Likes
on
0 Posts
Just get the head you have on there milled. You have 317's on there, the 317's are a better form of the 243's (ls6/ls2). The 853's are LS1 heads and flow no where near the 317/243's. I just dropped an LQ9 in my Camaro and i am going to use CNC'd 243 heads.
#3
On The Tree
Thread Starter
iTrader: (7)
Join Date: Sep 2008
Location: Lakeland, FL
Posts: 155
Likes: 0
Received 0 Likes
on
0 Posts
I bought the block with the 99-00 iron heads. I've heard those heads are not good at all for any performance application. Motor started its life as an LQ4, but I'm rebuilding using the LQ9 specs, with the addition of the 853s and a T2 cam.