1988montecarloss

iTrader: (6)

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

Gunslinger09

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.

1988montecarloss

iTrader: (6)

think i could get away with decking the heads .010" or .020" without running into PTV clearance issues?

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?

Gunslinger09

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.

1988montecarloss

iTrader: (6)

yeah i planned on checking the ptv clearance with clay before the engine went together for good and hopefully somebody who knows cams well will chime in, id like to run as much cam as i can before i start going backwards in power. 1/4 mile E.t. is the primary goal for this car haha

i have a truck intake too but my ls1 intake should still be better than that right?

Gunslinger09

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.

1988montecarloss

iTrader: (6)

alright ill try to get the truck intake in there then, i mainly only bought the ls1 because i got it really cheap and i was worried about hood clearance issues

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

Gunslinger09

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.

low2001gmc

iTrader: (148)

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

1988montecarloss

iTrader: (6)

alright, well at least i got it cheap enough so that i can get my money back from it

alright thanks, badass truck btw!!

onefast84

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!

1988montecarloss

iTrader: (6)

what is it running now with the ported 243's? whats the race weight of your car? thanks

87caprice318

iTrader: (1)

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.

1988montecarloss

iTrader: (6)

anything done to the 243's or just stock?

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

87caprice318

iTrader: (1)

Nah they just stock right now...I plan on getting em ported later on when i find the right person that really wont break the bank since this is purely a street car

1988montecarloss

iTrader: (6)

what are the specs on your custom ground cam?

i was gonna have advanced inductions port my heads once i had the money for it, but they are a little pricey at $995

87caprice318

iTrader: (1)

230/242 .600/.615 109+3

Yea thats who I was thinking but then again, I'm pretty sure Geoff or my buddy Jason knows someone that can hand port them for about 400 ish

1988montecarloss

iTrader: (6)

anybody else have any suggestions? at this point ive decided to just sell my ls1 intake and go with an ls6

onefast84

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.

KCS

iTrader: (20)

You should be okay with the LS1 intake, it's not all THAT bad. I made over 400whp with one and 241 heads on my iron block, and that's all before 5000 RPM where the clutch gives up. Sure, an LS6 is better, but I'd rather save that $300 for the FAST.