the women is gettin a 91 rs with a 350 TBI in, i have a set of double hump heads with 202 valves. it will be gettin a mild cam and those heads . just the heads alone what do u guys think a hp gain would be from them alone. iam more an lsx guy than a SBC guy. i needs some help, and remember i ALREADY HAVE THE HEADS. AND ARE GONNA BE USED. lol

 

Is the motor a factory centerbolt motor ? If so the 4 center bolt's on the intake go straight down instead of on a angle like the 202 camel hump's but all you have to do is drill the holes to the angle needed.HP about 20 more.

 

It depends on the casting number of the 1991 heads. If they are 193's you will gain a lot. 193's are swirl port heads.
Most 90's center bolt heads that I've seen have 64cc chambers so theres not much to be gained for compression.

 

yeah its a newer tbi motor with center bolt and iam gonna buy a edelbrock ti mani and drill them. and the casting number is 492's i think? i dont feel like walking out to the garage its cold. they are older heads

 

I mean the casting number of the heads that are coming off. 492 is a common double hump head.

What I'm saying is, if the car has 193's on it, you're going to see a much bigger gain.

If you're buying a TBI manifold why not get one for older heads?
Or better yet use a carb manifold with a TBI adapter.

 

Original TBI heads make table top like flow numbers, but they are low, they are a low end torque head, nothing more. Swapping to a head that can get air in above 4500 RPM ina decent manner is going to allow a peak HP number that does not take a nose dive like the OE TBI head, you might see 30 HP, but the across the board gain will be significant, the problem with a cam and a set of heads that are not straight junk on a TBI motor is the tune, it is a PITA to get a TBI car tuned for a cam, unless it is very slight above stock.

 

Yea, theres way more to this head swap on a TBI engine than I care to contribute.

The TBI is like the turd in a clogged toilet, you can add all the bigger pipe you want but it's not going to flow until you remove that turd.

FWIW I tune and burn chips for my TBI truck with Moates APU1 tuning hardware, it's not fun at all.

 

One question here is that did you put that motor in that camaro because 91 rs camaros didn't come with 350's.

 

ya i am kind of confused about your set up too.. There was not TBI 350 in that year....


If you are looking to upgrade it get a carb manifold carbs in my opinion are superiour to TBI's because you can get a carb to atomize the same if not better than a TBI set up. The only fuel injection set up worth keeping is the Mutli-Port. you will see quiet an increase with a mild cam and heads and intake for a carb. A carb will be no problem to tune and will respond almost the same in the cold as a TBI. The TBI was just the first step in fuel injection its **** just like hybrids are now. Do yourself a favor and go carbed or get a multi port set up.... Even the LT1 set up would be a huge step up. It should fit with minor fab.

 

305 tbi
And why
on top of the fact that if the heads are true camel humps then no accessory bolt holes. and no hardened seats. Different valve covers. may not have temp sending unit holes. Anything else i miss?

 

Some Ed, there were the camels that did have all the things you mention.

 

lol nice. well, the car once had a 305 tbi. it was swapped out when the rod didnt like the dark and escaped to the asphalt. lol what i was gonna do is get some bigger injectors and then put the heads and cam on for a lil while with a custom burnt chip for everything.the car doesent have to be the fastest thing in the world. them women already said when she gets the money she wants a lsx in there lol.

i just want somthing that will run decent sound kinda mean, and show her what a 12 sec run feels like. the car did 14.2 with 273's now it has 323's . she came up with the idea of a cam lol. i would go with a carbed intake but a carb but i have no clue how to work on one and it needs to pass emissions. i would do a carbed intake with the tbi but i have not a clue of were to get a adapter.


how much power can i put through a 4 bolt main sbc with out the rod escaping lol


i really wish i could throw a TPI on there and then eventually do the stealth ram but i doubt it will ever get to that.

 

A 4bolt main will handle all the power you can ever make with what you are doing.

An adapter for a carbed manifold to hold the tbi isn't hard. they are pretty much the same thing I wouldn't be suprised if the tbi actually bolted to some manifolds.

 

You can put a tpi setup on there for lil or nothing. Just go to 3rdgen.org and you should be able to find a harness, computer and the whole intake somebody is selling for dirt cheap. You would have to change the pump in the tank for the higher psi of the multi-port. There used to be a piggy back for the tbi ecm to put on a tpi setup on what you have.

Does anybody remember the 3rd gen tbi car that GM high tech did awhile back? They used vortec heads and milled them as much as they could to keep the compression around 10:1. The cam was close to a hotcam just more lift and they used an edelbrock intake with a bigger turbo city throttle body. If my memory serves me correct the car made 330 to the wheels and that was a 305 not a 350.

 

good deal does anyone know were i can get a chip burnt for now for the car? that isnt gonna cost butt tons of money?

 

Turbo city does them for 269.95 and you can check out Ed Wright.

 

The TBI wiring is amazingly similar to the TPI. (you could mod your harness and reach your goals)

 

 

I have a set of the 291 double humps and they seem to work good. Some come with 1.94 intake valves and others with 2.02. Just something to consider

 

Just 5.3 LS swap it