View Poll Results: Which combo
LQ4 with PRC 2.5 862s (58cc) = 11.0 CR
17
80.95%
LQ9 stock heads.
4
19.05%
Voters: 21. You may not vote on this poll
thinking about picking up a 6L, need some opinions..
04-08-2010, 12:40 PM
#11
Ok, here are some numbers of cam specs i threw together... I am trying to keep the DCr around 8.5ish....
option #1
LQ4 with my 58cc PRC heads, stock head gasket (.052)
224/224 .581/.581 114+2
CR = 11.01
DCR = 8.53
overlap -4*
Option #2
LQ4 with my 58cc PRC heads, stock head gasket (.052)
226/226 .585/.585 114+3
CR = 11.01
DCR = 8.50
overlap -2*
Either one of those should be pump gas friendly, have good midrange and idle stable... Option 1 might have a little more lowend and less topend than option 2 given the change in overlap...
now i could throw in a set of cometic .060 head gaskets to drop the compression down some, then i could increase the ICL a tad to compensate, which might allow me to run a little more timing and be even more pump gas friendly....
option #1
LQ4 with my 58cc PRC heads, stock head gasket (.052)
224/224 .581/.581 114+2
CR = 11.01
DCR = 8.53
overlap -4*
Option #2
LQ4 with my 58cc PRC heads, stock head gasket (.052)
226/226 .585/.585 114+3
CR = 11.01
DCR = 8.50
overlap -2*
Either one of those should be pump gas friendly, have good midrange and idle stable... Option 1 might have a little more lowend and less topend than option 2 given the change in overlap...
now i could throw in a set of cometic .060 head gaskets to drop the compression down some, then i could increase the ICL a tad to compensate, which might allow me to run a little more timing and be even more pump gas friendly....
04-08-2010, 12:41 PM
#12
LMFAO!!!!
I vote 06 and newer lq4 with your tsp heads. you get beefier rods with the newer motors right? where are you looking? I would replace the rod bearings, and put arp rod bolts in just as a piece of mind/don't have to mess with it later on a used motor. either way will be fun!
I vote 06 and newer lq4 with your tsp heads. you get beefier rods with the newer motors right? where are you looking? I would replace the rod bearings, and put arp rod bolts in just as a piece of mind/don't have to mess with it later on a used motor. either way will be fun!
04-08-2010, 12:43 PM
#13
and yep i think if i keep it a mild build my MPG should improve...Now what my current torque converter is going to do when i add ~80 ft/lbs tq is anyones question.... i am saving up for a Performabuilt L2 and Circle D 3c
04-08-2010, 12:45 PM
#14
I vote 06 and newer lq4 with your tsp heads. you get beefier rods with the newer motors right? where are you looking? I would replace the rod bearings, and put arp rod bolts in just as a piece of mind/don't have to mess with it later on a used motor. either way will be fun!
Last edited by BlackGMC; 04-08-2010 at 12:53 PM.
