Will do it right now as there is only x1 4" eagle crank in stock hopefully they are open

 

Pretty much confirmed the parts I had in my cart lol but he was very efficient and didn't seem to waste any time unlike the last tech I spoke with. Will think things over for minute

 

Well it is now officially ordered so we don't have to deal with my "what to do" posts hopefully for awhile :]

I went with a Eagle 4140 4" crank that needs a reluctor swap that I will manage
Summit LS6125927I 6.125 rods .927 pin
DSS Racing K1921-4030 +10cc pistons with plasma-moly rings
King XP main bearings MB5013XP
King XP narrowed connecting rod bearings MB5013XP
Compression will be somewhere around 10.5-10.8:1 need to find a more accurate way to CC my heads instead of a flimsy piece of plexiglass

After all that it came out to $2,107

A bit upset at myself for not finding the time last week as I could have saved $80 not to mention I didn't think about having to get the damn thing balanced until right after I ordered so there ups the total to $2,350.

But I am happy knowing there will be 408 in my driveway this Christmas :] Compression will be somewhere around 10.5-10.8:1

 

If I was to run this setup on a 200/205 .550 lift cam, stock 832 heads/exhaust would I be hurting the engine or just limiting the potential? I was asked this question and I answered no with a brief explanation of how most stock engines are already limited from the factory not to reduce the potential but rather extend the life of the engine. Now I am wondering if I was right lol but seriously had me thinking is there a way to hurt the engine with not allowing enough flow in the exhaust specifically.

Don't plan to run it like this for long, the money for exhaust will be had eventually soon but definitely before any intake upgrades. I have not decided if I am going to rework the heads honestly was just going to order new LS6 BTR springs and lap them myself with the proper suction cup drill attachment I have.

Who can tell me an approximate dynamic C.R. if the static C.R. is about 10.78:1?

I have also considered porting the heads myself.

 

OP,

We apologize for the delayed response as our forum advisor was on vacation last week. We appreciate your patronage and would like to assure you that you can save money with us throughout the year by checking out our Savings Central section on our website. We've recently introduced the Rewards Program, which replaces the Retail Only Speed Points program, and we also offer the Beat-a-Price Guarantee and special discount programs for active military members and veterans.

Regarding the combo you've put together, based on our calculations, with a 4.030 bore, 4" stroke, 10cc dished pistons, 68cc (823) heads, 0 deck clearance at 9.240, 1.115" compression height of the pistons, and a .051" head gasket, the compression ratio would be around 10.4:1. If you use a .040" head gasket instead, the ratio would be around 10.7:1.

As for the Torkinator SUM-8727R1 cam you've mentioned, it may not be the most suitable option for a 408. We recommend providing more information about your combo and goals so we can assist you further and recommend a more suitable cam.

Feel free to reach out to us via PM if you have any questions about our programs or need further assistance. We're here to help

 

Alot of people are giving that impression. The answer is going to be more lift and duration here. I may be ordering a Big Truck Torkinator SUM-8728R1 but I have not a clue what springs I would go with. Obviously single beehive would have a shorter lifespan and not be optimal for this setup. If I was going to do that then I would be looking for a set of Johnson lifters which adds another $1000 to the build which I am not open to spending at the moment.

I think for the time being with stock heads and exhaust that the .550 lift cam will do just fine. I want power at 12-1500rpm when it goes into 4th gear at 40mph not in the higher band like most. Yes the engine will be limited quite a bit with a lower lift cam but will it hurt it? No all it does is make people here cringe because of the wasted potential that will be opened up eventually. Driving the 6.0 compared to any of the truck I have owned has been so fun I know the added performance of the 408 will be quite pleasant for a great amount of time without me wanting more performance.

If anything I will open up my budget for a reputable tuner instead of doing it myself like I have been. My trims are always healthy verified with wideband but the spark tables in my tune could be better.

But sure go ahead and give us your 2 cents

 

If you want to keep the .550" lift then you could run the SUM-8719R1 209/217 112+1 .550/.550 It'll hit pretty low in a 408.

 

Seems like everyone is avid on big performance but once we start talking of average performance things get numb. I could use as much input as there is I don't know what I'm doing to an extent...

 

You're probably correct. However, 68Formula gave you an excellent opinion, which I agree with. A .550 lift cam will be great with the duration he suggested, or maybe even another 2° duration on both I & E. A 408 is a pretty big engine. The bigger an engine is, the more cam it can handle, and needs. Keep in mind that the smaller duration a cam has, the higher compression will be at lower rpm......

 

A second .55X lift option to work with LS3 type beehives would be the Cammotion 6.2L Stage 2 Truck "High Lift" 212/220 117+5 .553/.553
https://www.summitracing.com/parts/cxm-03-01-0110

 

Go to TSPs website and look at their truck cams. They have some nice low duration, low lift cams that fit what your describing. Designed to run on cheap LS6/LS3 springs too.
Scoggin Dickey also has some similar truck cams for a bit cheaper.
I dont like using cheap cams though, har some bad experiences in the past.

 

I've heard Scoggin Dickey's cams are good quality.
Cams aren't their main source of business, so they can price them more competitively.

 

I'm sure theyre fine.
I have one of their LS6 Power Max cams new in box somewhere in pile of parts lol

 

The ring width makes no difference for what you're doing, and it's related to neither longevity nor compression.

You're buying for price, buy the cheapest one.

 

OP,

It looks like you've sorted out the cam selection for your setup and goals, which is great. At the end of the day, it's all about what works best for you. You've mentioned that you're satisfied with using the SUM-8727R1 Torkinator, and that's awesome with us. Keep us posted once you have it up and running!

 

Thank you we will definitely see how it goes!!!