6.0 into 2000 k2500

RDF1 said:

Decapping the injectors won't add any power. Just make it run rich.

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RDF1 said:

I've been very happy with a Isky 212/218 .561"/.570" 114 in my LQ4. And i tow a good bit.
Idles great with just a very little chop. But with stock exhaust and no cats a hot rodder can hear it's not a stock cam.

I went ahead and did LS7 lifters and a new set of Isky 165A springs when i freshened up the LQ4.

The 5.3 I put in the '91 has a 212/212 .561"/.561" 114+3 isky cam in it. It idles good and has some good low end.


Dunno what tune you have for the 6.0 but a stock tune is pretty bad. They have a 60 second delay for PE and such.
Run 93 with a good tune and it wakes up alot!

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rolla711 said:

Decapping the injectors with all the other items I said will yield him more power since he will be able to mess with the tune also. If he's not tuning than yes I wouldn't decap the injectors.

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RDF1 said:

If they arent maxed out its not going to help anything. And if you do uncap them and not get them flow tested it could lead to other issues.


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rolla711 said:

Yes this is true. It all depends on the power he goes for after getting it tuned. With the stock injectors he'll be good until I think 400whp, correct me if I'm wrong. He can get up to 350whp on just the cam and springs alone. That's been proven.

Depending on how much growth you are planning to do with the truck would determine if you will need to do the injectors. Like RDF1 said don't mess with them if you don't plan on having more than 400 to the ground. If you get the bug to go faster research injectors and other power adders.

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RDF1 said:

I agree.. but it depends on what year LQ4 as to what size factory injectors are. The early 21# are maxed out stock. 25# don't give you much wiggle room. Anything larger than a tow cam I'd do injectors first. 8.1 (36?#) and 8.1 marine (44#) injectors can be found for a decent price.
I put down 440rwhp/540rwtq on a stock lq4 with a turbo and 8.1 marine injectors. Moved up fast tho. I now have 90# ha.

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rolla711 said:

Go to the junk yard and start looking for flex fuel trucks and rob their injectors. If I remember correctly they flow 44lbs. If you take the sensor also than you can run flex fuel, if it is of the plenty by you.

RDF1 did you do a sloppy build? Those aren't bad numbers for stock tho. Pretty Damn nice. What turbo did you have?

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RDF1 said:

Flex fuels are 36# for the 03-07 and require a different connector than the 99-02 injectors also.
Na I had one of the old sts rear mount kits way back in 2007 or 2008 ha. Garrett 60mm. It was choking out bad at 5500.
But it was a good setup for towing. Ended up going a 12.5@110 with a small 50 shot of nitrous on 6psi in a 5100# Silverado.

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rolla711 said:

Ahhh got ya. Well that will be better than the 25 and cheaper than new ones lol....but truthfully once you figure out what you're doing Jay, you'll need to choose a power level you want.

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