My combo:
new 350 shortblock
Edelbrock 6085 heads, 10:1 CR
ZZ4 cam
Accel base/runners (cleaned up)
SLP 1 5/8 headers
3" flowmaster cat-back
Hi-flo cat

Should I get the 23 or 24 lb/hr injectors. Of coarse I will have an AFPR. I'm leaning towards the 24 lb/hr ones because that is what everyone else seems to be running with the ZZ4 cam.


James


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1985 Z-28 305 TPI
165 ECM,STB,SFC,GW "wonderbar"

 

The stock 22 lb/hr. are adequate up to 450hp according to TPIS. Bump the pressure to 50 lb. and go for it.

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Red '85 MPFI V-6 T-5 Sport Coupe (bought new),now an IROC in sheeps clothing.
Rebuilt and installed '88 IROC L-98 TPI,700-R4,3.27 posi/disk rear,instrumentation, steering gear, and all suspension parts (even the wonder bar)
Mods:
IROC wheels, Hi-perf. rebuild on 700-R4,TCI sizzler torque conv.,B&M megashifter, L-98 .030 over,balanced,decked,blueprinted, SR Torquers, KB pistons,9.1:1 CR, port matched stock TPI, comp cams .450/480 206/210 cam, all free mods, subframe connectors, Edelbrock TES/jet hot coated, CATCO cat, Hooker catback, MSD 6A, airfoil, AFPR, K&Ns, polygraphite bushings all around, 1989 IROC memcal in summer, ARAP memcal in winter.

 

I am converting from a 305 to the 350, so I don't have the stock injectors.

If I get the 24 lb/hr injectors I won't have to run an ungodly 50 PSI of fuel pressure.

James

 

If you think you'll be happy with the motor naturally aspirated with no desire of adding a blower, get 22 or 23#. If you forsee more mods down the road, get the 24's and keep the pressure down. Willie has 19#'s in his 12.2x 305, so don't be convinced that you need larger injectors for more power, what you really need is fuel atomization. You may also want to change the injector constant in the PROM if your cold start feels too rich.

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-Jason M. 1991 Camaro Z28

 

I used 22lbs injectors with my ZZ4 cam and heads, at 48 PSI, and had no problems.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

24# svo injector are cheap and work very well with that combo.

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1991 Z28 ZZ4 with LPE superram base, SLP runners, LPE 58mm T-body,Random Technology ramair,TES headers,24#svo injectors,and just about every other bolt on that there is. Just got a ZEX nitrous kit!