Since my last post, I have decided to go with a 416. Simply due to the cost it will already take to build a LS3 stock cube from scratch, might as well skip a little further and go with what I ultimately will want in the end. I’m curious on what to expect with a Cam Motion Stroker Street King for cam. 244/256 .621/.604 112+4. I would like to see dyno graph if possible to see how power looks. Wanting to avoid an up top screamer since I don’t want to rev it crazy high.

12.2:1 (may eventually mill heads down and get closer to 13.0:1) compression ratio. I’m going with Wiseco +5cc dome, Eagle H beam with ARP2000, and BTR 4” crank. (Yes, E85 only truck. It’s everywhere around me).

96 single cab truck. 6L trans, 5K converter. Wanting to build a stout street/strip truck. Probably rev to 7000-7200. Nothing crazy.

At end of day I know I can go custom grind but truthfully I wouldn’t mind keeping this a “off the shelf” type of build.

 

More lift.... At least throw 1.8 rocker on it. Cam Motion has some high lift lobes, but are custom order. Everytime I see a low lift cam on a LS3, it's probably going to be mediocre at best. Lift isn't everything, but it makes the heads work where the flow really is. Otherwise, the cathedrals will outrun you....

 

Going in line with what you mention, what would you suggest for a shelf cam? Don’t want to go LLSR, wanting to keep this relatively simple. I’m not chasing a crazy HP number either. I’d like to make 520-530 wheel range and probably around 500 torque. If it makes more, great. But a decent 416 with 6L trans and a 5K will be a handful to drive. And that’s all I’m after

 

I agree with Dave, more lift, that's where those heads shine. Let the cam dwell right in the sweet spot of max flow, otherwise what's the point of those big ports and CFM numbers if you don't have a cam to reach them?

What intake do you plan to use?

 

I’ve decided on the GPI SS416 cam. 242/258 .646/.637
113+4

intake will be a rod mod ls3 intake (as of now). 4000 stall. Heads are going minimum 66cc to reach 12.0:1 with -3cc piston. May go closer to 60cc for the added compression. May or may not port them this go around.

 

As a side note- my original post stated Wiseco +5cc dome. They claimed 12.2:1 at 70cc but no matter how I crunched the numbers I was always atleast 12.75-13.0:1 so decided on -3cc. It was -3cc or big dish for 4.075 bore.

 

Much better cam, the GPI fully ported rod mod intake should definitely get you close. Just make sure you don't cheap out on the springs and lifters, absolutely should be using a link bar and get rid of those silly trays lol.

4.005 bore x 4.00 on mine, 66cc, -3cc Wiseco and .036 head gasket came out to 11.8:1.

 

Defintely will get a nice set of lifters in this combo. BTR .660 springs but if GPI suggests something else I’ll run what they reco. Seems like with this combo I’ll be right in the money with 6800-7000 peak, ~7200 shift points

 

luckily I rechecked my engine shop quote before purchasing. The +5 dome is 4.070 only. And my block needs 4.075. When we rechecked the only piston that would suite me is -3. The rest were like -18,-23, etc dish piston.

 

I ended up using Johnson ST2126LSR lifters and Manley Nextek #221435 springs(.675 lift) and made peak at 6650. Sounds like you're on the right track. Looking forward to seeing some results!

 

If your running e85, raise the compression for free power.

 

With 62 cc I’d be around 12.6, 60cc I’d be at 12.93:1

What is to be expected gain with a combo like this going from 12.0:1 to 12.6-12.9 range?

 

You'd gain roughly 1.2-1.5% throughout your powerband.

 

Please post your results when you finish this build. I am thinking about doing something similar. I just picked up an L92, but I already have a 4” crank, LS3 intake, and 92mm throttle body. I’m thinking about hand porting the stock heads, and using upgraded valves. I was originally aiming to make 620-650hp, but I don’t think that much will be necessary now that I have a 6L80. The better gears alone have made my car quicker.

 

I’ve been doing research ahead of time. What the bottom end will consist of is Wiseco -3cc dome piston, BTR 6.125” rod and BTR 4” crank. Heads will be milled ~62cc as I’m now aiming for 12.5:1. Looking around for head options on older threads here. I don’t really want to drop $2500+ on some aftermarket castings truthfully. I’m looking at either the SDPC ported heads or having a set ported by GPI. GPI rep still suggested the rod mod ls3 intake but every dyno/test I find with 400+ cubes the LS3 intake rolls off around mid 6000’s and nose dives pretty good to 7000. So intake will be on back burner until I discuss with some shops. (yes, I’ve watched more Richard Holdner videos than I can count).

I’d be happy at 530-550 whp range and 500+ ftlbs at 4000-4500 range. Shifting around 7000-7200. Heads will be a dual .660 spring kit, titanium retainers, some nicer lifters and probably ls3 rockers with trunnions or shaft mount rocker.

 

I agree with 6L trans. That’s why I’m okay with shifting power curve to 4000+ range. With the gearing, 4500-5000 converter, and a decent gear it’ll still get out of hole just fine I believe.

 

On another thought, I was comparing flow numbers and looks like I found out who does the CNC porting form SDPC. Same exact intake/exhaust from SDPC and PRC. Not sure if that’s already known info but saves me some cash if I decide to buy a used set of heads

 

Anyone have results with these heads? Seem dirt cheap for CNC port to flow 373 CFM at .600+

https://www.summitracing.com/parts/flk-ls3-505/make/chevrolet

 

They're "as cast" not CNC and they flow 373cfm @ .700+, not .600+. But they are decent price providing the quality is acceptable.

 

Out of the 3 what would you guys recommend? BTR, Summit, or Callies Compstar for the 6.125 rods? Seems all 3 are a China style H beam unless I’m wrong? Anything I’m paying for with 1 over the other besides weight? Callies seem lightest at 619g