how mutch HP can these parts diliver

[Roadrage David]

I can buy these parts below for my 4 inch stroke 475ci 7300 rpm 730 hp pontiac roadrace engine.
Im defenatly buying the manifold witch imcludes the fuel rail and black hose as im bulding a black engine.
But sins im a novice on EFI i whant to know if these injectors and the trottle body can diliver
Ford 42 lb. injectors:
Accufab 1215 cfm polished 4 barrel throttle body
Im planning to buy the new Holly EFI system...Picture of the parts below. Thanks David

https://static1.pt-content.com/images/noimg.gif (http://imageshack.us/photo/my-images/190/accufabtb.jpg/)
Uploaded with ImageShack.us (http://imageshack.us)

[CarlC]

Is that 42lb/hr @ 42psi?

If so then @ 6.1lb/gal and 90% duty cycle, then:

42 * 8 = 336lb/hr

@ 0.5BSFC (naturally aspirated) = 336/0.5 = 672

672 * 0.9 = 605hp.

If the injectors are rated at 42psi but the running pressure increased to 58, then the horsepower capability goes up.

[Roadrage David]

Thanks Carl.
they are listed as 42 lb.. case they are to small witchi gues they seem to be!! witch ones DO i need to feed 750HP and anny particulair brand i should use!, also is the trottle body,s CFM large enoughf??

[Ollie8974]

David,
This is a link to an injector size calculator,
http://www.ls1tech.com/forums/fueling-injection/293742-fuel-injector-size-calculator-fuel-pump-chart.html
This is the link to the LS1tech forum where the above calculator is posted.
http://www.ls1tech.com/forums/index.php
I know this forum is primarily a 4th gen. site. I have found valuable fuel injection information there.

[Roadrage David]

Thanks oliver.............

[MrForce]

42's are typically rated to 600 HP. I would run a minimum of 60 lb/hr. but given the fact that it is a high rpm, big block, 72 to 80 lb/hr will give you room to grow and not affect your idle or cruise.

Rob

[Roadrage David]

Ok chekt it out with Golen racing and they told me simulair specs aroun 70/75 lb. thing is im running a variable rokker system with a 1.18 rokker ratio below 3500 rpm and 1.67 above 3500 rpm.
wil that lower rocker ratio have a problem at idle with those bigger injectors?? again im a novice on EFI

[MrForce]

Variable ratio rocker arms will not make a difference.

[Roadrage David]

Ok cool..