my LQ4 build plans and a few ?'s
#1
my LQ4 build plans and a few ?'s
okay so im swapping an lq4 6.0 into my 88 monte ss and this is my plan for the motor:
stock LQ4 6.0 bottom end
stock 243 heads with PAC .650 lift beehive springs
.040" thick headgaskets
texas speed MS3 cam (not sure what i should run for an LSA though?)
LS1 intake and throttle body
Hedman 1 7/8" primary longtube headers
now here are my questions
could this make 425-ish rwhp through my RMVB th350 with 3600stall converter?
and could it push my monte to 11.50-60's in the 1/4 if i could get a 1.5-1.6 60ft? the trans does have a transbrake in it
the car weighs about 33-3400 and will have a 12 bolt with 4.10's running 275/50r15 m/t et street radials
also does anybody know what length pushrods i would have to run?
should i go with the MS3 cam? or do you guys have any better suggestions?
and finally what will my compression ratio be with a 100% stock bottom end, 100% stock 243's and .040" HG's?
thanks for the help guys, hoping texas speed chimes in because thats where ill probably be buying most of the stuff from
stock LQ4 6.0 bottom end
stock 243 heads with PAC .650 lift beehive springs
.040" thick headgaskets
texas speed MS3 cam (not sure what i should run for an LSA though?)
LS1 intake and throttle body
Hedman 1 7/8" primary longtube headers
now here are my questions
could this make 425-ish rwhp through my RMVB th350 with 3600stall converter?
and could it push my monte to 11.50-60's in the 1/4 if i could get a 1.5-1.6 60ft? the trans does have a transbrake in it
the car weighs about 33-3400 and will have a 12 bolt with 4.10's running 275/50r15 m/t et street radials
also does anybody know what length pushrods i would have to run?
should i go with the MS3 cam? or do you guys have any better suggestions?
and finally what will my compression ratio be with a 100% stock bottom end, 100% stock 243's and .040" HG's?
thanks for the help guys, hoping texas speed chimes in because thats where ill probably be buying most of the stuff from
Last edited by 1988montecarloss; 01-17-2013 at 04:25 AM.
#2
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I see that combo putting down about 375 RWHP and getting an 11.8-11.9 range ET. Things that will hold you back some will be the stock heads and Ls1 intake. Have the heads ported and machined and go with an Ls6 style intake. Add 1 7/8 headers and you should get where you want to be.
#3
I see that combo putting down about 375 RWHP and getting an 11.8-11.9 range ET. Things that will hold you back some will be the stock heads and Ls1 intake. Have the heads ported and machined and go with an Ls6 style intake. Add 1 7/8 headers and you should get where you want to be.
375rwhp seems a little low to me considering you see cam only ls1's put that down, although they usually do it through a t56 or 4l60e and not a built th350, and in this thread: https://ls1tech.com/forums/generatio...ld-budget.html you say pretty much my same combo will make "well over 400" at the wheels through a 4l80e?
i would like to get the heads ported by AI down the road but that wont be for awhile, gas mileage or street manners dont matter much since this car will be just a toy to drive around and to the strip and back, so should i run a bigger cam? or is an MS3 my best option right now?
Last edited by 1988montecarloss; 01-17-2013 at 03:12 AM.
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Talk to the machinist about milling the heads and your PTV. Always check before final assembly though. See if the will do uou a deal on porting too. The RWHP estimate I made was taking into account a built auto trans with a big stall. I guess you could go bigger with the cam since you don't need a lot of street manners but if you go to big you will actually not get optimum power. Talk to the cam gurus on here about it. And don't forget the Ls6 intake.
#5
Talk to the machinist about milling the heads and your PTV. Always check before final assembly though. See if the will do uou a deal on porting too. The RWHP estimate I made was taking into account a built auto trans with a big stall. I guess you could go bigger with the cam since you don't need a lot of street manners but if you go to big you will actually not get optimum power. Talk to the cam gurus on here about it. And don't forget the Ls6 intake.
i have a truck intake too but my ls1 intake should still be better than that right?
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The truck intake flows close to what the Ls6 intake does. If you can't budget for an Ls6 and the truck unit will clear the hood go with it rather than the Ls1 intake.
#7
is there any power to be gained from porting the ls1 intake?
eventually i want to run AI ported 243's, a fast 102 intake and a .650-ish lift cam but i dont have the money for all that right now haha
Last edited by 1988montecarloss; 01-17-2013 at 04:17 AM.
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There is nothing to be gained from porting a stock LS1 intake. The LS6 intake has a much larger plenum and runners than the LS1 unit. That's why you got it cheap. You can always upgrade to a FAST 90/90 later.
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mill heads .015 for use with those cometic .040 gaskets to put you close to 10.9:1. the ls1 intake wont cut it and will hinder you. as stated, go with truck intake in meantime. i would suggest a 228-232 cam on a 112 or 111 lsa to work best with your gearing and stall. good luck with your project
#10
mill heads .015 for use with those cometic .040 gaskets to put you close to 10.9:1. the ls1 intake wont cut it and will hinder you. as stated, go with truck intake in meantime. i would suggest a 228-232 cam on a 112 or 111 lsa to work best with your gearing and stall. good luck with your project
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My cam only lq4 with a carb runs 11.50's. Not sure of the horsepower though. Thats with a carb too. I agree that the ls1 manifold is restrictive. I was running stock 317's unmilled. I think you should be There with a better intake and a good tune up!
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Bro, i have the same engine in my caprice, check me out on youtube @87chevythang....But i have a carb, custom cam, 243, etc...anyways my car is heavier than yours and when i tell you that I know for a fact my car is somewhere mid 11s, it is....I've driven a LOW LOW 12 second car, hell i raced a mid 12 car a couple weeks ago on the street and this is still with my rims on and beat it to the point he thought i sprayed him... You will be surprised what that 6.0 will do in that MC.
#14
Bro, i have the same engine in my caprice, check me out on youtube @87chevythang....But i have a carb, custom cam, 243, etc...anyways my car is heavier than yours and when i tell you that I know for a fact my car is somewhere mid 11s, it is....I've driven a LOW LOW 12 second car, hell i raced a mid 12 car a couple weeks ago on the street and this is still with my rims on and beat it to the point he thought i sprayed him... You will be surprised what that 6.0 will do in that MC.
and what do you guys think about running a super victor intake with a throttle body elbow on it compared to the ls6 intake? about the same price-wise about $500, not sure if that intake would fit under my hood though haha
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I am in the process og installing them over the winter. I am hoping for a mid to low ten. I think it weighs in a 3400 with me in it. The car is also doing P90x over the winter to lower the weight.