I know he'd need 22lb. injectors for a stock 350, but this will have headers, decent cam (about .480 lift), and other stuff. Also, where would he send the prom to get reprogrammed to accept this? I/he really don't wanna learn to do this, that's why I like my carb.

This is for a friend, thats why I used 'he' and not 'me'.

EDIT: Also what size injectors will be needed?

 

22's will cover him up to around 425 hp, and with the mods you're listing, he's not gonna see that. - Also, I've got two modded 350's running on stock 305 prom/injectors. Not to say they wouldn't run better w/ the 350 stuff, but running fine.
- The one I'm playing with right now is a 4x4 tahoe. Fresh 350, ported vortec heads, 1.6 roller rockers, headers/dual exhaust, and fully ported stock TPI. Stock 87 305 MAF chip, stock 87 19lb 305 injectors. Funny thing is I actually switched to a ported MAF to lean it out a bit. - It's getting 17 mpg w/ a lead footed driver running 80-85 and it'll boil 33's w/o even trying.

- yes, the proper tune/injectors is better, but not neccessary to get it going/start playing.

 

Shagwell, will 22 inj. handle 400 hp with a 100hp NOS shot?

 

TEAPOT3208, sorry for hi-jacking your thread.

 

as in you have 400 on motor and want another 100 on juice? If dry kit, i wouldn't recommend it. if wet, then sure. Wet kits put the fuel in to offset the N2O, so no tuning is required, other than backing off a little timing(maybe 2-3 degrees). I personally don't recommend dry kits one way or the other, but that's your choice.

 

Shagwell, it a friend's car. He has 400HP or alittle bit more. He is adding 100HP N2O, I'm not sure if its wet or dry. If he goes with a dry kit, should he go with larger than 24lb? He is building this engine now and buying injectors this week and I would hate for him to buy to small of injectors.Thx.

 

My 88 Trans Am had a 305 stock which was swapped for a 350, with no other changes. this caused my fuel pressure to drop from the mid-fourties to low 30's. what would cause this??

 

if your fuel psi drop w/ an engine change, somethings f'ed. either a ground was missed(highly likely) are something has started to let go. With a stock fpr the tahoe has something like 38psi w/ the vac hooked up at idle.
- if he doesn't have the ability to tune the prom for the N2O do not go dry kit. If he's got 400ish all motor, he'd need injectors(24ish) and he'd have to have the prom programmed to put the extra fuel in to compensate or it'll go lean and....well, would he like his motor to continue running or is he all about putting new pistons in?

 

He has a ZZ3 engine with a TPIS mini-ram. I think they are doing his prom.

 

- I would say they're probably doing the prom then, but I still wouldn't run a dry kit. They'd have to program the prom to compensate extra fuel for the N2O, which means at WOT w/o the juice it'd be miserably fat. I know there are some guys that can find a tune that works well for both, but all in all, just get a wet kit and let the spray compensate itself.