what size injectors would be good for a fully siamesed(siamesed until 6 inches before air enters cylinder head) and modified TPI 400 small block also would a 52mm t/b flow enough ?? or would i be better off with a 58mm

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87 IROC-z 305 TPI 5spd 10-bolt 3.73 posi ,8.8 Accel wires , bosch platinum +4 plugs,MAF sensor screens removed, gutted air box, ram air, K&N air filters,TB coolant bypass ,polyurethane tranny and torque arm mounts, K&N oil filter,Mobil 1 synthetic oil 20w50, futura GLS super sport tires 265/50/15 rear and 235/60/15 front mounted on 86 monte carlo SS rims ,

400 sbc and a 6 spd in the works

 

It depends on the cam. If it will spin high, and flow good, a 58mm would be better. Same for the injectors. They are like jets. You'll need an adjustable fuel pressure regulator too. Don't go too big, and be stuck with them. They have used stock 22# for over 400 hp. Get a set of 24# or 25# and you'll have enough. Make sure they are cleaned and matched too!

 

A lot depends on your cam specs, and head flow #'s, but I've currently got 24lb *ord inj. and I'm hitting 80 to 90% duty cycle so I'll be going up to 30lb inj. soon. Thats with a mild cam (gotta pass Ca smog!) for a 400 (222 and 228 at .050 with .494 lift an a 114 lsa) and TF heads. And yes, I'm running a 58mm.



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86 406

 

go with 30 s as the min size and you might want to go even to 36lb's either way you will need to modify your prom to use them if you are lookin for 400hp i'd say 30's if you want 500 hp i'd start with the 36 ers remember that ford 30's are actually gm 33 so they are a good choice.i'm running them in my supercharged 350 and they work great.i also beleave that traxton is running them in his n/a 350 with good results so saying that they are too big to me is bs.

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1990 Trans Am,350 TPI(L98),WS6suspension ,bridgestone RE71's /245/45/zr16
edelbrock manifold,asm ltr's
paxton supercharger,afr 190heads, alston sfc's,msd 6AL-BTM,
8.5 superconductor wires SLP 1-3/4 headers,duel cats,3"slp exaust, lakewood LCA's,T.B.Bypass
160 degree stat,alum driveshaft,fiberglass wing,custem chip by me!

"if you cant win fair CHEAT"

 

here is some more information about my combo, i plan on using world products motown 220 cyl heads, not sure what cam i will be using, any suggestions or tried and true combos?

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87 IROC-z 305 TPI 5spd 10-bolt 3.73 posi ,8.8 Accel wires , bosch platinum +4 plugs,MAF sensor screens removed, gutted air box, ram air, K&N air filters,TB coolant bypass ,polyurethane tranny and torque arm mounts, K&N oil filter,Mobil 1 synthetic oil 20w50, futura GLS super sport tires 265/50/15 rear and 235/60/15 front mounted on 86 monte carlo SS rims ,

400 sbc and a 6 spd in the works