I bought a complete 350 tpi off a member. Im going to hopefully this winter pull my 350, paint the car and do the engine. I would like to use the stock fuel system. Going to get a set of stock l98 heads. Is it possible to get 1hp/ci or higher with these heads and stock fuel system? I have headers and full exhaust. If not what would be a better combination? Id like to stay as close to the stock tune as possble. Im not going to run EGR or AIR. Any input on what cam I should use with these heads/intake or what cam and heads combo I should use would be a big help.

 

There's much more to it than that. Dynamic compression plays a huge part when determining what size cam to be considering. Never settle for "peak" numbers, as you want that power to be happening under the curve as well. If you're going to be utilizing L98 heads, what (if any) kind of work will you have performed on them? Let's get an idea of compression and air flow, and then it's only a matter of "when" and "where" you want that power to occur...

 

Id like to get a set and keep them as stock as possible. Basically what would it take a factory l98 to make that kind of power? I know they made 245 max hp. Is it even possible to do with the heads stock?

 

Without having work done to the L98 heads, and without installing an aftermarket camshaft, it'll be next to impossible to obtain the numbers that you're after, stock. You might want to consider a power adder...

 

I think youve kind of misunderstrood what im meaning. I plan on installing an aftermarket cam. Im wanting to know what cams I should consider. Should I go HSR or some other intake of that sort. Things like that. Working off of a stock l98 platform.

 

but still with the heads being stock it will be hard to reach your goal.
1hp per ci will be next to imposiable with the stock heads regardless of what cam or intake you chose.some good porting will tell the tale.the cam and intake combo will be a mater of how much cfms you get out of the stock head. then you could mach that with your cam intake chooce. i dont know what the stock heads flow so i cant really help to much.with even port matching and good cam the hsr would get you pretty close, i think

 

Too many variables. You're looking to obtain at least one horsepower per cubic inch (assuming RWHP, because that's where it honestly matters). All power lies within you're H/C combination. Starting with an L98 platform (but soon discarding the stock heads), 350-RWHP will easily be attainable. If you opt to go with the stock, untouched heads though, it gets rather complicated...

 

Run away. Run far, far away.

 

When the system gets old, **** breaks and youll pay out the wazoo to fix it Good luck!

 

 

Thats why I was asking the possibility of these numbers. Ive never dealt with TPI before and was thinking of trying something new for the learning experiance. 350hp is a pretty nice number on a carbed engine and really not too overly hard to obtain.

 

For a mild N/A TPI long tube setup, 350hp is a bit hard to get. You will probably have to have an aftermarket base, AS&M runners, aftermarket heads and a nice cam.

 

What kind of numbers should I look for?

 

With stock heads (ported / cleaned up) and stock fuel system ( I assume you mean stock size injectors even? ) and a mild cam you could get 275 or so at the crank.

 

the real story is the numbers.more than hp what are quarter mile times you wish for. hp is just a number a time slip is the real show.

 

Id like to have a reliable 13 second car. 12's would be nice but 13's would make me happy with street tires.

 

I just ran my car sunday. Ported L98 Heads, ZZ4 Cam with 1.6 roller rockers, ported TPI base, ported SLP runners, Ported plenum, shorty headers, no cat, 3" exhaust, cold air intake, underdrive pulleys.

Sounds about similar to what you would like to do to yours.

My ET? 14.57.

That's why I said "run far, far away".

TPI is NOT made for getting good ETs.

 

Is that with stock suspension and rear? What size rear tires?

 

Its on a GTA.

Auminum driveshaft, borg warner 9 bolt 3.27 posi.

Brand new tires, 245/50/R16 Ecsta Supra

Trans has a shift kit and corvette servo (hits really hard its nice)

Rear suspension has boxed LCAs and adj panhard bar. Poly Torq arm mount.

 

Hehe, not all N/A TPI's though...

Click Here

 

Bottom line is if you want a nice fuel efficient motor thats fun to drive around town and makes tons of torque (read: does killer burn outs) then stick with the TPI. You'll have a lot of money into a TPI setup to make it run good ETs


If you're okay losing some low end tq opt for a stealth ram or LT1 intake swap, they will get you the track times and HP your after, while still running smooth and well mannered on the street.

 

my car is a th350 streetfighter with 10 bolt posi 3.73 lakewood control arms and kuhmo 255-50-16. Would rather have a 4 speed auto but the 3 speed makes the car fun.

 

A 700R is a three speed when its in "D".

and it has a deeper first gear... about 3:1.

 

13s with a tpi are not hard at all.tpis base and runners. ported penilum and tb with a matching cam and good tune.that should be good for mid to high 13s

 

Is the 700r4 durable? (Dont mean granny driven durable) Is the driveshaft the same length as a th350? If so I might do the swap one evening.

 

How much does the TPIS base and runners cost?
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Stock for stock I dont think theyre quite as tough as a TH350. They can be made so easily. I do not think the driveshafts are the same length, unfortunately.

 

Lol next question. Would it be worth it? How much does a low mile streetfighter sell for usually?

 

I don't know what your trans is worth.

Whether or not its worth it depends on what you use the car for. With a 700R you will get overdrive and electronic torque converter lockup (which is usefull both on the highway and at the track). The 700R probably robs more HP then a 350, however.

 

there were some 350 transmissions made that are the same length as some of the 700s.
maybe you have one of those, only way to know is get under it with a tape measure.
i have been told that a 350 has a 22% drive train power loss, a 700 has 18%.
with its lower first gear, a 700 would make it even more fun to drive than a 350.

 

Should I look for a stock setup? Or should I spend the cash for an aftermarket unit. I mainly drive my car to and from work. Only raced once on the street and never had it to the track. I plan to do so since The National Trails Raceway is about 3 minutes from my house.

 

I disagree .


Anyow . My setup netted my 251/318 to the wheels . Not even tuned yet. It's not hard at all to get into the 13's . Some have done it on stock setups with tuneing and suspesion stuff. Once tuned I plan on about 13.6-13.8 . My heads aren't ported yet either.

 

What cam/heads are you using? Stock fuel system? Im very interested to know your setup if your willing to share it.

 

crap I forgot the check the sig in my reply . Stock fuel system , stock ( cleaned and flowmatched ..I can't stress how much you need to do this )

 

What about this setup? Stock fuel system lt4 hot cam kit slp runners. l98 heads cut for 202/160?

 

Oh I don't know about running away from TPI. Let's see what my next round of mods will do.