hunterohio

With the thread title in mind, quick questions.

With this setup, do I need to change fuel rails and injectors for increased fuel ?

Do I need to change throttle body ?

Do I need to change oil pan to a +2 quart pan and hi flow oil pump ?

KCS

iTrader: (20)

You don't need new rails but you will need more fuel, so larger capacity injectors are required.

Neither a larger throttle body or a larger pan is required, but depending on your clearances, a higher volume/pressure oil pump would be a good idea.

hunterohio

Is it possible to put too large of an injector on ?

What would you recommend on the 408 stroker setup for injectors?

As far as a higher volume oil pump, any suggestions or recommendations based off experience?

KCS

iTrader: (20)

Yeah it is, but it comes down to the injector. Some of the nicer injectors can be way too big but still meter fuel pretty well at lower duty cycles. How much fuel you need is largely based on how much power you plan on making and how. Most companies that sell injectors will be able to recommend something based on your goals and budget. I went with FIC and had my stock LS1 injectors modified to flow 48lbs/hr, which is probably a little excessive unless I were to spray it.

I like Melling pumps. The 10295 is basically a stock volume pump, but a different bypass spring will increase the pressure at higher RPM. The 10296 is larger and flows more volume and has the higher pressure spring, so you get more oil pressure across the board. The 10355 is a replacement AFM/DOD pump and is even larger and flows more than the 10296.

So if your 408 is built with tight clearances, the 10295 will be fine. The 10296 would keep oil pressure up with loose clearances, and the 10355 for really loose clearances.

"MAC"

iTrader: (1)

What kind of intake are you running? What car is the engine going into?

hunterohio

Haven't gotten the truck yet. Looking at Silverado with 6.0 lq4 and then bore it out 30 over. 408 stroker.

Thinking about using all LS6 internals. Cam, lifters, rods,rockers,valve springs, heads and intake. Any thoughts on this ? Good or bad.

I'm a first time builder, so I plan on taking as much time as I need.

"MAC"

iTrader: (1)

How much power do you want to make? Thats the real question, either way you need a ls3 top end kit with a 408. Get with Tony Mamo he will help you out a lot with head selection.

hunterohio

Idk who that is. I would love to put down at least 500 to the wheels. More the better for me.

LLLosingit

iTrader: (4)

You do realize that to make a 408 you need to do more than bore the 6.0? You need a 4" stroke crankshaft, 6.125 rods and 4.030 pistons for that combination.

LLLosingit

iTrader: (4)

Why does he need an LS3 top end kit? My 408 isn't based on the LS3 top end.
You can use just about any head on a 408 cathedral or rectangular port ls3 style.

"MAC"

iTrader: (1)

Ls3 heads flow better than his 243 heads. But your right,ima use my ported 241s until I can get the money for a ls3 top end kit

"MAC"

iTrader: (1)

Also OP get with Martin for a cam selection as well

Orange Juice

iTrader: (3)

You will also need to upgrade your fuel pump, and if the system is older you may want to put in a new fuel pressure regulator and piping if it is mounted in the tank.

hunterohio

Yes I know this. Thanks anyway. Have to buy a little bit at a time. Like I said, willing to take my time. Be it 6 months or two years.

Tuskyz28

Since you have Alot of patience I'll just go ahead with the LS3 heads or if your budget allows a set of AFR/TFS heads would be killer.

hunterohio

My biggest concern is putting a system together and have it not have enough of something.

Examples, oil pump, oil pan, fuel pump, water pump.

Any known ideas that work is appreciated. I'm making a list of everything that is needed before I start.

6.0 bored 30 over to 6.7
408 stroker rotating assembly kit
Forged connecting rods, and pistons
Ls3 top end kit
Ls6 cam ( unsure about this)
All new arp bolts
New Metal gaskets
New freeze plugs
New oil galley plugs (including barbell looking one)

Sure I'm forgetting something

smok'nZ

iTrader: (160)

You will want a custom cam not an ls6

"MAC"

iTrader: (1)

Get with Martin @Tick performance for the cam.

"MAC"

iTrader: (1)

Lifters and trays, double valve springs, rockers, might wanna look into a trunion up grade, make sure you get the right reluctor (how ever you spell it)wheel whether its a 58x or 24x, maybe might get a MS4 cam or a cam thats around that. Like i said talk to Martin. Other people are more knowledgeable about cams than i am.
Try and get TSP ls3 cnc ported heads or some AFR heads. Fuel injectors is a must, search around on here about 408 builds and find out what size injectors they commonly use. I may also forgot something as well.

Tuskyz28

Yeap I agree! Like Mac said call Martin @ tick, Pat G, Ed Curtis or my guy Brian Tooley