What size injector for my build?

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BelleTair07

New member
Jun 2, 2015
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Hey everyone, new to this forum but I've got a quick question for you guys. I'm trying to decide on injectors, whether to go with 45% overs or to go with 100% overs. I had originally intended to go with 45s, but got to thinking because the motor is out and apart why not go with bigger now rather than later? Unless they're a waste of time, I honestly am not sure. My build so far is as follows:

2003 lb7 ccsb.
66mm w/ billet wheel built by Glenn from ED
45% OR 100% full body injectors?
Fass 150
Lbz regulator
Ppe manifold
Carrillo rods
Keyed cam/crank/balanced
Delipped lb7 pistons
M/A 700
M/A motor mounts
Studs and ARP hardware kit
Kory Willis tunes


And in the near future, dual fuelers and a second charger in the neighborhood of 84-91mm

Think that's it. I'm aiming big with this one as money allows. Will doing 100% injectors now hurt anything without having the dual fuelers? There's a chance I can swing doing those as well before it's all put back together. But just in case I can't, wanna know how she'll run with such large sticks. Thanks guys!
 
catman3126

catman3126

Ehhh?.... You don't say?
Jul 24, 2012
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NE Oregon
Built motor. Do 100 over's you wont have to drop coin twice when you max 45's out and need to go bigger.
 
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BelleTair07

New member
Jun 2, 2015
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That is what I figured. What do you think it'll put out for power, rough guess? My only concern was hurting something by too big an injector for my pump, but maybe that's not an issue. And like I said I'll be getting dual fuelers asap, I know fuel delivery will be my weak point.

Thanks again!
 
S

S Phinney

Active member
Aug 15, 2008
4,008
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Quncy, Fl
BelleTair07 said:
That is what I figured. What do you think it'll put out for power, rough guess? My only concern was hurting something by too big an injector for my pump, but maybe that's not an issue. And like I said I'll be getting dual fuelers asap, I know fuel delivery will be my weak point.

Thanks again!
Click to expand...
The pulse can be held back enough to work with what you have until you get another pump or enough pump. It will cost more money but I would go with the motorsport nozzles instead if extruding the stock nozzle. The motorsport is a SAC nozzle and the stock us a VOC nozzle. The difference is how the pintle/needle seals and stops fuel delivery. SAC nozzles are what's on all generations since the lb7. 100 overs would be fine but if you are going g big compounds and use motorsport nozzles I wouldn't be scared of 125 to 150 over with a hood person tuning your truck.
 
Ne-max

Ne-max

I like turtles
Nov 15, 2011
3,361
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Lincoln, Ne
I would hold off on injectors and put money towards a AF cam and some aftermarket pistons. Get a solid bottom end then worry sbout more fuel.
 
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