so far this is the parts list

L98 heads (milled for compression for the 305) Maybe mildley ported

LT1 Cam with Stock Springs (low milage cam and springs)

TBI performer intake (maybe)

New timing chain

Low Milage 305

Questions:

(Yes i know custom tuning will be required)

Do i need the 350 injectors

Do I NEED the intake

Will stock LT1 springs work on l98 heads?

Where can i get decent lifters for cheap to decent prices

Has anyone passed emmissions test with lt1cam? (no need to really worry for 2 years now)

this motor is being built then dropped in so i can do just about anything.

only planned change for later is a set of vortec heads in a year. (l98's are cheaper for me now)

car has full exhuast already.

i'm building the motor to be good daily driver that has no problem roasting tires

yes its staying tbi

 

I'd personally advise against porting them any further if you stick with the 305. There is such a thing as too much port volume.
The concensus is that Edelbrock managed to make a really shiny copy of the stock intake... don't even bother with it. Search the forum for popular intake manifolds that actually improve performance.
All this work and you're not finding a 350?....
Larger injectors would be highly advisable. The stock 45pph injectors barely keep up with the stock motor. Any real modification pushes their duty cycle over the edge.
Not to my knowledge. Z28 springs are the common reccomendation
No such thing as a cheap hydraulic roller lifter (and if there were I'd avoid it like the plague).. but you can find aftermarket replacements specifically for 87-95 roller small blocks in Jegs or Summit (can't remember which one)
l98s may be cheaper now, but you *really* want the vortecs... sometimes price tags can be hard to argue with, of course, but factor in the cost of the gaskets, time, and vehicle downtime, then factor doing it twice, and the pricetag evens out pretty fast...

 

You can get away with the stock injectors for now. You are going to need a high volume fuel pump to keep up. You can really take the stock injectors far when you have a high volume pump. They are a little underrated and should only really be changed if you go with a larger TBI unit. I would not reuse the stock springs at all. You are spending a lot of money for that combo and what is another 50 bucks for good new springs. The edelbrock intake is not that bad and would work nice. It is the SAME desing as their carb performer intake but with the top modified for TBI. Since it has the smaller bores to begin with it doesn't perform like the carb version. However, boring the intake bores to 2" does amazing things to this intake and puts it on par with most carb intakes used for TBI.

 

hmm i found a decent recently running 305 from a 90 formula at the u pull
179 takes it home

the l98s are 100 before the mill job

lt1 cam is 40 with springs (won't need them now)

i have a pair of 350 injectors in my back seat chillen right now.

cheap huh the only high cost is the new stuff i gotta get

oh and by the way i'm still under the cost of a 350 with my new stuff.

 

You are going to need.

Gaksets - 50+
Timing set - 50
Springs - 50
Chip burnt (not sure since I have them burnt for me but I bet it is more than 50)
sealants - 20
Fuel pump - 100

Are you going to have the heads checked by a shop? Are they gonna do the port work for you. These are all things that will make your grand totoal much higher.

 

Was the 90 Formula 305 a tpi or tbi car? You can use the stock roller lifters in your build up also. If the engine was a tpi originaly then use the 305 heads and have them ported and maybe have larger 1.94in., 1.55ex. valves installed, shouldn't cost much more the having to mill and port the L98 heads.

Steve

 

heads are comming off a running and driving formula
with 40k on dash. the guy is doing engine mods.

so do you guys think this will be enough to get me over 250 maybe 270?

 

350 tpi

 

Is the 305 block a roller block? If so use the lifters out of the engine that is in the car now. When you pull out the old engine just grab the lifters out and put them in the new engine before installing it. All you have to do is take the intake manifold off and the valve covers so you can loosen the rocker arms and then take them out. Just reverse the process to put them in the new engine.

Steve

 

edit: my co worker is screwin around.

 

He was asking you if your block was a roller block. 305's for the f body were roller from 87 on up. You can reuse hydraulic roller lifters without any problems.

 

the reason I said use new lifters is because generally, new cams use new lifters. the cam has about 10k my lifters got 90k

edit: delayed post sorry just read u shifty.

 

Yea no problem. As long as the lifters still spin freely and they are not gauged or knicks seriously in any way you can reuse them.

 

yo' shift think this combo will be good for round 250-270 hp?

 

Well it all boils down to your tuning. 250 is a good goal to strive for with a heads and cammed LO3 with the proper fueling and exhaust mods. Once you step up the head flow and or cam size with a larger TBI unit, higher hp umbers can be achieved. You will be very happy with a properly tuned 250 hp or so TBI.

 

by the way the vortecs would add at least 600 to the equation for the 305.

i have a vortec 350 combo planned but thats a whole other ball park.

 

would a stock tpi pump be enough for this combo?

 

Yes.