LTX and LSXPutting LT1's, LS1's, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects, including repairs, swap info, and performance upgrades.
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I have searched and im still confussed on what to get. I have a turbo 350 trans in my iroc now. So what lq4 would i have to get to make my turbo 350 bolt up and work. I also have a 7004 trans i could use.
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__________________ 85 Iroc 11-1 438 BBC, hooker headers 3:42, th350, ACC 3200-3600 stall, torker 2 intake, holley 800cfm carb, comp 294S 595 lift cam, msd 6a, blaster 2 coil, spohn torque arm and th350 cross member, PA racing k member, PA racing a arms
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It's the crank itself that is the issue between the early and later blocks. The early block cranks will work with SBC style trans (700R, TH350, LT1 style T56, T5, etc). If you want a newer block to work with an older transmission you just take the motor apart and put one of the older style cranks in it or you can use a crank spacer for the flex plate. I actually have a crank from an older block that I would sell for reasonably cheap if you wanted to go that route. I put an LS2 crank in mine because I wanted to use an LS1 T56.
(heads)99-00 have iron you can pick up cheaper, and go straight to LS6 heads or aftermarket right away. The newer versions are LS6 design with lower compression 72cc cambers, that are good for boost (I plan)
(blocks) some caddy's and ss have aluminum versions (sweet)
Tci makes an adapter for the cranks, I believe, not sure (i used a 04 6.0/4l80e)
__________________ [
Ram Air Firebird Formula 350 1987
Powder Coated Holley Stealth,
HX50W Holset, monster SX pump,
42lb injectors, FMIC, FS BOV [[Tuning in progress]] and I still have my Nitrous back up my 10psi... bent 3 rods..... now 6.0L/ 4l80e going in
I don't think there were any LQ9s before '01, the development of the LQ9 came hot on the heels of the LS6. The main difference is the LQ9's got flat-top, coated-skirt pistons instead of the LQ4's dished pistons. LS6 #243 heads on an LQ4 gets you comparable results.
* 2002-2006 Cadillac Escalade
* 2002-2006 Cadillac Escalade EXT
* 2003-2006 Cadillac Escalade ESV
* 2003-2007 Chevrolet Silverado SS
* 2004-2005 Chevrolet Silverado and GMC Sierra Vortec HO Edition Only [Badging on truck](B4V)
* 2006-2007 Chevrolet Silverado and GMC Sierra VortecMAX Option
both are heavier then ls1's so not good for high rpm's (6200+)
__________________ [
Ram Air Firebird Formula 350 1987
Powder Coated Holley Stealth,
HX50W Holset, monster SX pump,
42lb injectors, FMIC, FS BOV [[Tuning in progress]] and I still have my Nitrous back up my 10psi... bent 3 rods..... now 6.0L/ 4l80e going in
So the 99-00 have crappy heads compared to later. Is that why some of the lq4's were rated at 300hp or was that because of different cams.
compared to the alum heads, they are not as good. and they are way heavier. stock 317 go for good prices, and are same intake runner as 243 castings. 71cc chamber. very good heads for the money. although the 243 and 799 are very similiar, they all share the same intake and exhaust ports, the 243 and 799 have smaller chambers at 65cc and usually go for more than 317.
Ya I wouldn't rev a stock block that high regardless...
y not bro? they will take some abuse, if fortified with arp rod bolts and if the cylinders are in healthy condition.
although 6000+rpm may be alot to ask for from a worn stock motor.
i turn my dd to 7k when i have to and its a .060 over lq4
the engine has around 13k miles now and been in car around 3 yrs.now.
if anything it took its toll on my t56
y not bro? they will take some abuse, if fortified with arp rod bolts and if the cylinders are in healthy condition.
although 6000+rpm may be alot to ask for from a worn stock motor.
i turn my dd to 7k when i have to and its a .060 over lq4
the engine has around 13k miles now and been in car around 3 yrs.now.
if anything it took its toll on my t56
Ya I meant stock as in BONE STOCK. The rod bolts are weak on a factory block. I will spin mine to the high heavens because the peak on my cam is something like 6,400 RPM plus I have lighter rockers, forged internals, and ARP bolts.
