LQ4 build
11-05-2010, 04:33 PM
#11
TECH Resident
Thread Starter
you sure about 10.8:1 because my 2008 has 243s on a 5.3 and CR is 10.5:1 6.0 having a bigger cylinder with a bore and stroke i was thinking 10.0 maybe 10.2:1 just my way of looking and the numbers.
11-05-2010, 05:15 PM
#12
Formerly darynC-10/23/10
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stock 243 heads or worked 243 heads? i didnt want to mill the heads cuz the machine shop here charges over $400 hr and they quoted me 6 hrs
and im not payin 2400 for worked heads its not a 8 second project plus ive heard good things about 317 and i kinda want to keepa Budget
and im not payin 2400 for worked heads its not a 8 second project plus ive heard good things about 317 and i kinda want to keepa Budget
6 hours to mill some heads? holy fudge.them peope are slow as hell if it takes them that long shouldnt take no longer than 1 hour ,and 400$ an hour is fn retarded.
sell the 317's to help pay for some stock 243 heads( they usually go for 500-550) and a 224/228 cam(400) springs(250) pushrods(120) and you should be in the 380 range easily.
so i say you will be in the motor about 1500 after gaskets & fluids & beer!! but its well worth it
11-05-2010, 07:52 PM
#17
Lots of confusion going on here!! Here are the facts, someone prove me wrong...
99-06 LM7 5.3: Dished pistons, 9.5 CR on 706/??? 61cc heads
07-current 5.3 (and05-06 L33): Flat-top pistons, 10.0 CR on 243/799 64cc heads
01-?? 6.0 LQ4: Dished pistons, 9.5 CR on 317 71-72cc heads
??-?? 6.0 LQ9: Flat-top pistons, 10.0 CR on 317 71-72cc heads
??-?? 6.0 LS2: Flat-top pistons, 10.8 CR on 243 64cc heads
An LQ4 with 243/799 heads will get you approx 10.4 CR
Also, my local machine shop mills heads for $80 a pair LOL
99-06 LM7 5.3: Dished pistons, 9.5 CR on 706/??? 61cc heads
07-current 5.3 (and05-06 L33): Flat-top pistons, 10.0 CR on 243/799 64cc heads
01-?? 6.0 LQ4: Dished pistons, 9.5 CR on 317 71-72cc heads
??-?? 6.0 LQ9: Flat-top pistons, 10.0 CR on 317 71-72cc heads
??-?? 6.0 LS2: Flat-top pistons, 10.8 CR on 243 64cc heads
An LQ4 with 243/799 heads will get you approx 10.4 CR
Also, my local machine shop mills heads for $80 a pair LOL
I know, huh?! IDK why anyone would ever charge that much...
