LQ4 mods ( again )
Thread Starter
Staging Lane
Joined: Jan 2007
Posts: 71
Likes: 2
From: st-jean baptiste, quebec ,canada
LQ4 mods ( again ) Here `s the story ,
my son has a 2000 LS1 Trans am & T56 ..... ( LS6 intake )
he bought an 02 LQ4 complete to transplant in the T/A.
I think that if I port & shave .040 off the 317`s , + LS6 intake ,it would give good results and he could keep his LS1 complete ....
1) should I modify the 317`s or the 241`s and why ?
2) on an LQ4 what is the max safe lift ? ( with shaved 317`s )( for cam choice )
we`re on tight budget ,heads are either 241 or 317 , no head swap.
cam , springs & lifters will be changed,
thanks
Dan ,
my son has a 2000 LS1 Trans am & T56 ..... ( LS6 intake )
he bought an 02 LQ4 complete to transplant in the T/A.
I think that if I port & shave .040 off the 317`s , + LS6 intake ,it would give good results and he could keep his LS1 complete ....
1) should I modify the 317`s or the 241`s and why ?
2) on an LQ4 what is the max safe lift ? ( with shaved 317`s )( for cam choice )
we`re on tight budget ,heads are either 241 or 317 , no head swap.
cam , springs & lifters will be changed,
thanks
Dan ,
Last edited by bigdan1; Nov 12, 2014 at 06:18 PM.
Imo it's a toss up between the heads. Some hand porting before you put them back on will help whatever one you pick. As far as milling and watching ptv clearance with a cam requires a few need to knows first.
Deck height
Compressed headgasket thickness
what pistons are being used? Stock? Flat top? With or with valve reliefs?
What kind of compression are you after?
Have an idea of what cam you want?
Once you know these best advice is call the sponsors. Give them your specs and what your looking for. They should be able to tell if it will clear ptv or not. But still check it ! Doesn't take long.
Deck height
Compressed headgasket thickness
what pistons are being used? Stock? Flat top? With or with valve reliefs?
What kind of compression are you after?
Have an idea of what cam you want?
Once you know these best advice is call the sponsors. Give them your specs and what your looking for. They should be able to tell if it will clear ptv or not. But still check it ! Doesn't take long.
Thread Starter
Staging Lane
Joined: Jan 2007
Posts: 71
Likes: 2
From: st-jean baptiste, quebec ,canada
being on a budget,
the engine having 45k milles the original pistons will stay in there ....(stock bottom end )
the 317`s would be milled .040
we are looking at around 10,25 :1 ....
The cam will be choosen depending on valve to piston clearance
I asked because tons of people here played in these engines
it should be a well known factor .....
thanks
dan
the engine having 45k milles the original pistons will stay in there ....(stock bottom end )
the 317`s would be milled .040
we are looking at around 10,25 :1 ....
The cam will be choosen depending on valve to piston clearance
I asked because tons of people here played in these engines
it should be a well known factor .....
thanks
dan
Being that compression ratio and stock lq4 have a slight dish compared the flat top ls1 pistons I would say you would be fine to run the biggest off shelf cams available. Ms4, vindicator, hellion, polluter v2 etc etc. Keep in mind these are max effort cams that need all the right supporting mods or it will be a dog.
And yes tons of people have been around these cars but you need to be more specific in order to get the best answer. Vendors will give you the best answer. That doesn't mean other people on here can't help though. I look at similar setups, what kind of mods and power they make. Also ask people on here but I always end asking a vendor before I buy. Just my two cents.
And yes tons of people have been around these cars but you need to be more specific in order to get the best answer. Vendors will give you the best answer. That doesn't mean other people on here can't help though. I look at similar setups, what kind of mods and power they make. Also ask people on here but I always end asking a vendor before I buy. Just my two cents.
Last edited by GiggleJuiced_SS; Nov 12, 2014 at 11:12 PM.
TECH Fanatic
Joined: Aug 2011
Posts: 1,324
Likes: 6
From: Marengo, Ia
Being that compression ratio and stock lq4 have a slight dish compared the flat top ls1 pistons I would say you would be fine to run the biggest off shelf cams available. Ms4, vindicator, hellion, polluter v2 etc etc. Keep in mind these are max effort cams that need all the right supporting mods or it will be a dog.
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This is why asking a vendor and measuring is best lol. I just figured it's a slight bump in compression over a stock ls1 (10:1) and came with flattops. Most of should keyword should clear. But yea I said u need all the supporting mods and I would want more compression then 10.25:1 to make a better power band.
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Staging Lane
Joined: Jan 2007
Posts: 71
Likes: 2
From: st-jean baptiste, quebec ,canada
after reading lors of subjects on this ,
I tought that milling .040 off the 317`s would be a safe limit
and @ .040 it gives around 10,25
id prefer 10,75-11,0 , but then I thought that I would have to use the 241`s to obtain these numbers
I tought that milling .040 off the 317`s would be a safe limit
and @ .040 it gives around 10,25
id prefer 10,75-11,0 , but then I thought that I would have to use the 241`s to obtain these numbers
Thread Starter
Staging Lane
Joined: Jan 2007
Posts: 71
Likes: 2
From: st-jean baptiste, quebec ,canada
personnally for 20 cubic inches I woulndt go true all this ....
At least I gained that he wont put 5.3 heads on the LQ4 for even more money spent ....
Dan
TECH Fanatic
Joined: Aug 2011
Posts: 1,324
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From: Marengo, Ia
He should be reading more. The money he has into that LQ4 could get those 241's CNC ported and milled. TSP's stage 1 porting only cost $750, that should be worth close to 40 hp when you consider the bump in compression along with the additional flow. That extra 18 cu is worth 20 hp at best with milled heads and it comes with and extra 90lbs on the front of the car.
Thread Starter
Staging Lane
Joined: Jan 2007
Posts: 71
Likes: 2
From: st-jean baptiste, quebec ,canada
sad , but he already bought the engine ....
so now , how much can I shave off the 317`s without issues ?
@ Fry: at first »I suggested him to port & slight mill the 241`s ,
put a better cam ,injectors ( if needed ) and & tune
he would have been totally satisfied with this ,.......... but .......
Im only dad !!!!
Dan
so now , how much can I shave off the 317`s without issues ?
@ Fry: at first »I suggested him to port & slight mill the 241`s ,
put a better cam ,injectors ( if needed ) and & tune
he would have been totally satisfied with this ,.......... but .......
Im only dad !!!!
Dan
Are you still on stock injectors? Without knowing the duty cycle you can't say for sure but considering it's getting tuned anyways getting a set of 36lb injectors wouldn't be a bad idea. Save from going to the dyno twice. I maxed out mine with bolt ons, ls6 intake, and cam on a ls1.
10 Second Club
Joined: Jan 2010
Posts: 2,317
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From: Hurley, VA
Wait we're pulling a perfectly running ls1 to put in a lq4? Id regroup on the entire motor swap right now. Your adding weight and losing compression. Personally id sell all the lq4 stuff and invest in a heads cam set up. And if the Intake hasn't been changed a 2000 had the ls1 intake.
