Caddydaddy84

I'm new to the ls world will be doing a gen 3 ls out of a 2000 yukon and wanted to know what are some things I should do to the motor before dropping it into my project car??

02*C5

iTrader: (1)

what is it going into?
what are your goals?
street car or max effort track car?
That helps out to be able to give you some type of direction in what to do

gametech

iTrader: (1)

Clean it.

QwkTrip

iTrader: (23)

LS engines really respond to cam swaps, even mild cam swaps. It's a "gotta have it" kind of thing if you're going through the effort of an engine swap.

Caddydaddy84

going igto a 80s cadillac. Just want a good cruiser daily if needed to be.

Caddydaddy84

definitely doing that

G Atsma

For a heavy cruiser like the big Caddy, replace any external worn parts, drop it in, .and run it

Caddydaddy84

good thing I don't got to do the dod stuff but what do you recommend? Will a cam swap lead to other parts have to be changed out to or only the cam will do and wake it up??

Caddydaddy84

can be any more heavier then the yukon the motor coming out of lol

pdxmotorhead

Ok now its just a curious thing,, Depending on Which 80's caddy that thing could outweigh a Yukon by 2000 lbs..

I'd put one of the drop-in towing truck cams from like Summit, the engine revs well anyway. but to drag a BIg body caddy,, torque is king..

Caddydaddy84

85 fleetwood brougham. Ok I'll look into a tow cam

Caddydaddy84

Was looking into this one and looks like it's a drop In and go type of cam don't need to change springs unless you a want more rpm range then they recommend ls6 springs

Summit Racing™ Pro LS Vortec Truck Swap Camshafts SUM-8701R1

G Atsma

This cam will run well, but have an audible lope, which I'm not sure you want with a Caddy meant for just cruising with a tall axle ratio.

Caddydaddy84

I don't mind a little chop that's music to my ears lol will be adding dual true exhaust with 40 series flowmasters my favorite sounding exhaust to me

02*C5

iTrader: (1)

Like stated a small cam that makes all the power under the curve is what you want. Remove the heads clean them up. I’d go as far as making sure them heads have new springs valve guides do a trunnion upgrade and seals. You’re probably going to need a converter talk to your tuner and see if the cam selection will work with a stock one. This is to keep it with manners. A caddy with a lope would be beautiful thing to hear lol. A TSP 220R would also be a nice cam. Get a good tune and send it. Is this a complete resto or just a drop in.

Caddydaddy84

Rite. The cam I posted you can keep the stock converter but if you upgrade the springs I would need a tune they say.. ok will look that 1 up as well thanks for the advice

68Formula

You will need a tune regardless. By drop in, they mean stock springs, not stock tune. Very few cams will even run on a stock tune tune unless the overlap is <-15* (less the better), and even then they don't run anywhere near as well. When you start changing the valve events, you are changing the entire volumetric efficiency curves both rpm and load. The fuel and timing need to be compensated for.

I'd recommend getting the SUM-8728R1. Requires springs but the power level should be similar to the 8701R1 but way more low and mid-range torque to get that heavy Caddy moving off the line. And it'll still have a healthy lope. Buy the kit and save some money: https://www.summitracing.com/parts/sum-8728-2-bhv.

Caddydaddy84

Ok so when they tune, it when the car is on the machine while car is running ? Ok let me check that cam out right fast

Kawabuggy

iTrader: (1)

Tuning is simply a process where information is gathered about how the engine is running as it relates to timing, fuel curve, idle, PE, and MANY other parameters. Sometimes this information is gathered on a machine known as a dyno. Sometimes, however, this same information can be gathered while driving the vehicle and gathering/recording the information during a scan and log session. Regardless of how the information is gathered, the parameters in the "tune" or PCM programming, is altered so that you can achieve the best running condition of the engine. This process usually cannot be done in a single session. It takes a LOT of driving under varying conditions to work out the absolute best programming information. Sometimes a single tuning session can get you "close" and then the PCM has enough lee way to make fast fuel corrections (STFT-short term fuel trims), and it can also correct for knock conditions by reducing timing.. Idle correction is also possible-up to a point. Regardless, when you alter internal engine components that change the fuel, timing, and PE, requirements that the engine needs-it will have to be tuned, or the factory programming altered to work properly, or most efficiently, with the new components. That's all that tuning is about. And yes, if you change the cam to that Summit cam, or essentially any after-market cam, you will need to go through the tune and correct all of the relevant parameters. Further, even an all stock engine that has had no changes done to it internally can sometimes benefit from being "tuned" as even though the factory is close, most engines are set up to run lean from the factory, or not have the best timing curve for higher performance. Or lack Power Enrichment where the engine needs it... Or... this list could go on for a long time.

68Formula

Kawa's post should be made into a sticky for answering, "I'm changing my camshaft, will I need a tune?" :-)