Spacing question

[405cubes]

I'm looking for specs on stock injector spacing/fuel rail spacing for my project. Does anyone have specs for tpi, lt1, stock configuration?

Would like to see if I can make it work for my application.

What I need is simply measurements for spacing of injectors on each side-to see if a stock tpi or lt1 rail may fit so I can source one. Specs could be either the Rail itself or the manifold itself.

Searched around here and the net, no answers...


...Fwiw, I decided to go mpfi using gm system pieced together and use a dual plane street intake. CHALLENGE! May use GM style rail or fab myself, but hoping some oe rail will work. Can't wait to see how much fun getting the bungs to correct depth with the dual plane will be-as the sbc looks like a finger crossed in that area! Worst case, probably make extentions off the rail to get it right. May retardistically work itself out.....
THANKS!

[TINBENDER59]

I'm looking for specs on stock injector spacing/fuel rail spacing for my project. Does anyone have specs for tpi, lt1, stock configuration?

Would like to see if I can make it work for my application.

What I need is simply measurements for spacing of injectors on each side-to see if a stock tpi or lt1 rail may fit so I can source one. Specs could be either the Rail itself or the manifold itself.

Searched around here and the net, no answers...


...Fwiw, I decided to go mpfi using gm system pieced together and use a dual plane street intake. CHALLENGE! May use GM style rail or fab myself, but hoping some oe rail will work. Can't wait to see how much fun getting the bungs to correct depth with the dual plane will be-as the sbc looks like a finger crossed in that area! Worst case, probably make extentions off the rail to get it right. May retardistically work itself out.....
THANKS!

I'll check it out tomorrow for ya, "I have 3 LT1 rail sets, Ill sell ya one cheap. look at this http://www.ebay.com/itm/CHEVY-Small-...#ht_1018wt_867

[405cubes]

Wicked intake and a good price. Any good leads on something for more low end response?

[steveo]

rails are one of the easiest things to make, you should just diy.

lt1 stock rails are really shitty slip fit oring things. they aren't stable at all unless bolted solid to an lt1 intake.

also it's more optimal to feed both rails in parallel, lt1 has series feed rails.

[405cubes]

rails are one of the easiest things to make, you should just diy.

lt1 stock rails are really shitty slip fit oring things. they aren't stable at all unless bolted solid to an lt1 intake.

also it's more optimal to feed both rails in parallel, lt1 has series feed rails.

Lol nice to know. Tpi rails any good? Supposedly same spacing as lt....
Idk if either will pan out on a performer rpm anyway, may use square or even rectangle stock in the event the injectors end up offset to keep things as they should be.

I just cant accept the belief that some huge 7000 rpm intake is the right thing for my application....
with rev limited to 5800+/- etc and my purpose for a semi-daily driver.
Understanding dry vs wet flow and all, i just dont see cruise rpm generating enough heat to cause major power loss.
What little i do know, generate torque and you get driveability and better economy-hence the PITA i face. I do plan to take notes as I go, maybe I can help someone else later on.

[delcowizzid]

down here we use dual plane highrise manifolds with 4 bbl TB's on 355 strokers but a lot of people end up rebuying manifolds to go with the single plane just for more extreme WOT power.if you wanted low rpm torque for pure street/tow duties long runner tpi manifolds would be the go.cam selection is a major to get right theres no point having a cam that starts working at 2500 with a manifold that runs out at puff at 4500 etc.
having full control over spark helps with big manifolds you can run more advance down low where the manifold is soggy then lower timing as rpm rises and it comes on song and then begin advancing again and you dont have to worry about airspeed through the carb to get atomisation so the manifold will work better at lower rpm compared to being topped with a carb.i have 1 6L stroker here thats carbed with big single plane and a pretty good cam its strong right off idle and fully on song by 2000 and pulls till the cows come home.before tuning the carb with a wideband it was soggy till 3600 rpm then it would take off.the same goes with twin tunnelrams people say they are bad for low rpm power we have a worked 454 with twin 660 dp's it drives like its injected but with no vacuam advance it sucks the gas but it has unbeleivable grunt from idle to 6500.its all in the tuning

[TINBENDER59]

rails are one of the easiest things to make, you should just diy.

lt1 stock rails are really shitty slip fit oring things. they aren't stable at all unless bolted solid to an lt1 intake.

also it's more optimal to feed both rails in parallel, lt1 has series feed rails.

I wouldnt run a fuel rail that wasnt bolted down???? so I don't understand that statement?? and at 45psi, Parallel, or series aint gonna make diddly difference. Unless, of corse, you are unleashing 1000hp at 9K+ at which point it would be a little bit different fuel delivery process IMO??? But you can rework the LT1 and TPI rails to be parallel fuel delivery with rubber fuel lines with AN fittings, My next project will be thus,

[EagleMark]

For a cheap MPFI the LT1 intake can be converted to a distributor? And if you PM Lextech he has one for sale with all the work done. IIRC it does not have injectors but the intake work needed was done...