LM7 383 Build Up

[blackout]

Well. First Post. Here goes...
I hope I put this in the right section of the forums.

I am building a LM7 (5.3) motor into a 383. I know this kind of build has been done before but I am having trouble finding information on the build. I will be using an ls1 or ls6 grind cam and either some ported 5.3 heads or some ls6 heads. The question I have is what kind of upgrades would the fuel system need to support this kind of build?

Thanks,
Ty

[skeet]

NA? a walbro 255 would be fine, you plan on staying NA or gonna force induct it? theres alot of verribles to concider, pending on what youre wanting to do. let us know more of what youre thinking and how you really want this motor to perform. is there a rwhp limit you wanna achieve? you call make this on a budget? give us a little more detail and i bet a few of us could help ya out !!

[blackout]

ok. this will be a N/A motor (no boost). I want to use it in my truck for towing and maybe a lil strip action. Looking to do it on a budget (well that is relative. haha) but I want some good hp and tq out of it while still being somewhat fuel efficient as it will be a daily driver.
what kind of injectors should i use? what is the stock size injector?

[pl4yboy]

ok. this will be a N/A motor (no boost). I want to use it in my truck for towing and maybe a lil strip action. Looking to do it on a budget (well that is relative. haha) but I want some good hp and tq out of it while still being somewhat fuel efficient.
what kind of injectors should i use? what is the stock size injector?

If no nitrous or anything, the stock truck injectors would probably work. Virgil is running those. Stockers are around 24#. The flex fuel injectors are 36# though, if you plan on adding a little spray.

[blackout]

a walbro 255 would be fine,

If no nitrous or anything, the stock truck injectors would probably work. Virgil is running those. Stockers are around 24#. The flex fuel injectors are 36# though, if you plan on adding a little spray.

So it sounds like between the 255 walboro and the stock 24# injectors i should be set. Anyone have a link to a source for that walboro 255?

[skeet]

Walbro - SummitRacing.com


and i think allen sells them, but not sure

[blackout]

Walbro - SummitRacing.com


and i think allen sells them, but not sure

so is this the pump i need?
Walbro GSL392 - Walbro High Pressure Inline Fuel Pumps - Overview - SummitRacing.com

another question...

If i decide to go with the 5.3 Heads which cast number 5.3 heads should i get? 241, 706, or 862 heads? Or are they all the same?

[skeet]

no you want the internal pump, you'll have to modify the bucket to make it work. its a simple task. you plan on having any port work done to the heads?



here ya go

Walbro Electric In-Tank Fuel Pumps - SummitRacing.com

[blackout]

no you want the internal pump, you'll have to modify the bucket to make it work. its a simple task. you plan on having any port work done to the heads?



here ya go

Walbro Electric In-Tank Fuel Pumps - SummitRacing.com

which one of the pumps on that page is the one i want? and is there a thread on here that talks about that modification to the fuel pump bucket?
and yes I plan on having the heads ported.

[pl4yboy]

so is this the pump i need?
Walbro GSL392 - Walbro High Pressure Inline Fuel Pumps - Overview - SummitRacing.com

another question...

If i decide to go with the 5.3 Heads which cast number 5.3 heads should i get? 241, 706, or 862 heads? Or are they all the same?

243s for NA.