So I’m currently doing an ls swap in my 1998 iv finally decided I’m going to pull the trigger an do it now that I have the funds and time. A little background with my truck it’s a 1998 c1500 regular box extended cab I recently rebuilt the rearend which I swapped over to a 14 bolt and put 4.11s with an eaton trutrac in it

i got my hands on an lq4 and a set of 243 heads my plans with the engine was to rebuild it and put 0.10 over flat top pistons in it and wanted a compression ratio in the 11:1 (if I can go higher I will) with a 4l80e and a circle d torque converter
I talked to circle D and they recommended a 3600 stall I was looking at the torquer v2 or v4 cams but don’t know exactly what an 3600 to me seems high for a truck

 

What you going to use the truck for?

Something about this size cam would be fine if its a play toy truck and running a decent size tire (28-30")
https://cammotion.com/recently-resto...227-232-113-4/

Converters these days are nothing like they were 20+ years ago.
Some of the circle D converters drive like stock until you give it plenty of throttle.

I run some 3800-4000 converters in turbo trucks and they drive amazing.

 

I had a 3200 CIrcle D behind an LQ9 WIth the sloppy Stage 2 cam and it was on the tight side. I would do a 3600 Stall.

 

The truck is going to be a weekend warrior that I do some burnouts in and hurt some feelings occasionally and driving the summer time (I’m from the great white north of Canada)

 

OP,

This sounds like a solid combo for a 98 C1500, especially with the gear and compression you’re planning. The cam range you’re looking at makes sense for how this is shaping up.

One option worth considering is our SUM-8710R1. Specs are .625/.605, 230/242, 113+3, with 10* overlap. This isn’t a typical truck cam, but with compression, 4.11s, and a higher stall converter, this is more of a weekend fun setup than a work truck. It has a strong, steady lope and really comes alive in the mid-range, carrying power well past 6,500 rpm with the right valvetrain. This cam would pair well with a 3,600 stall converter and lines up with what Circle D is recommending.

For valve springs, you could run our .630" lift beehives or the Trick Flow by PAC .660" lift duals. With the compression and camshaft you’re talking about, long tube headers and a free-flowing exhaust are strongly recommended to let it work correctly.

On pistons and compression, if you can stay at .005" over, our 2cc Pro LS flat tops are a good fit. Being an LQ4, you may have either:

• .945" press fit pins in the 99 to 04 Gen III rods
  
• .943" floating pins in the 05 to 07 Gen IV rods
  

For the .945" rods, the piston would be SUM-3269454005-2.
For the .943" floating pin rods, it would be SUM-3269434005-2.

With a .051" head gasket, compression lands around 10.6:1. Stepping down to a .040" gasket puts you just under 11:1. With the factory 9.240" deck height and 6.098" rods, that tightens quench to about .045", which helps efficiency and reduces knock sensitivity. This would be a 93 octane combo.

This would definitely be a combo that would surprise some folks! Let us know if we can be of any further assistance. We'll be happy to help!