6.0 vs 5.7
07-11-2013, 06:53 AM
#23
2. TEA is always a great choice for ported heads, Mike can also set you up with a great cam choice, but he resently pointed me to Geoff at EPS for a custom cam.
3. Roughly 550-600 hp before you start to push the envelope. The stock rod bolts are more well known to be the weak point.
07-24-2013, 11:28 AM
#24
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reading all these posts is making me want to go dyno my motor just to see what it makes, because it runs VERY WELL,
all it is , is a stock ls1 short block with ls1 hot cam ,ls6 intake, 317 heads milled to 64cc, and its in a 68 camaro with the 6speed
i have been reading alot of threads about the 317 heads, and it seems that almost every body has a differant opinion,
knowing now what i know, this is going to sound crazy, but i has c5 427 block and 427 rotating assem. with 317 heads,and it made right at 610 to the rear wheel and i sprayed 150 shot and it made 780rwhp, to me that is pretty good
when i had the heads flowed, the guy said he has never seen a 317 flow as much as these, so they had a little work on them.
all it is , is a stock ls1 short block with ls1 hot cam ,ls6 intake, 317 heads milled to 64cc, and its in a 68 camaro with the 6speed
i have been reading alot of threads about the 317 heads, and it seems that almost every body has a differant opinion,
knowing now what i know, this is going to sound crazy, but i has c5 427 block and 427 rotating assem. with 317 heads,and it made right at 610 to the rear wheel and i sprayed 150 shot and it made 780rwhp, to me that is pretty good
when i had the heads flowed, the guy said he has never seen a 317 flow as much as these, so they had a little work on them.
07-24-2013, 06:21 PM
#26
No, they are identical from the outside. Some people say you can pull a spark plug and look into the hole when it's at TDC and see the dish vs flat top. If you can look up the VIN, you may be able to figure it out from a CarFax. If not, assume it's an LQ4 and pay accordingly. I think the LQ4's were going for about $2-300 less than the LQ9's when I bought mine. Not a huge difference.
They are both great engines, but the added compression give the LQ9 the edge.
LQ4 (9.4:1) = 300-325hp/360-370tq
LQ9 (10.0:1) = 345hp/380tq
Also, if you are keeping the heads, stay away from the 99-00 models, as they used iron heads.
-----edit-----
I just remembered the LQ4 has a U in the VIN and the LQ9 has an N. But I didn't see a stamping anywhere on my block.
They are both great engines, but the added compression give the LQ9 the edge.
LQ4 (9.4:1) = 300-325hp/360-370tq
LQ9 (10.0:1) = 345hp/380tq
Also, if you are keeping the heads, stay away from the 99-00 models, as they used iron heads.
-----edit-----
I just remembered the LQ4 has a U in the VIN and the LQ9 has an N. But I didn't see a stamping anywhere on my block.
