I'm wondering which throttle body would most benefit my motor. Keep in mind, I don't know a whole lot about fuel injection, but I know that getting a carbeurator that flows too well can be major overkill to a mildly modified motor.

My '95 LT1 is only slightly modified, stock bore, etc. For right now, the only plans I have (as budget permits) are a set of Hooker LT's. Down the road a bit, I may go a little wilder and do intake, head, and cam swap. So for right now, which throttle body would best suit my needs? Is there one that would benefit me now, but would also work well with the heads/cam/intake I'm wanting to add later on? This car has to remain streetable, so I'm not going to go too wild with the motor.

Any suggestions on 52 or 58, which brand, and where to buy from are appreciated.

 

I'm not exactly sure what the stock size of the intake is (possibly 52mm), but I bought a 58mm Holley TB for my LT4 intake (waiting to be intalled). I had to bore the intake a bit so there is no restriction. You can get the biggest TB but it won't do any good unless the intake holes are matched. I know a friend who might be selling a BBK 52mm for a good price, he is blownbird01 on the board.

 

Ok, I'm clueless about this stuff, and I'm honestly not trying to offend you, just curious. If the stock size is a 52 mm, then how would the BBK 52 mm help at all? Thanks for your time.

 

Until you start getting all of the other bolt on's done, you do not need a throttle body. There are plenty of people on here that are running upwards of 330rwhp with the stock tb. The stock tb flows fairly decently. However, if you start getting into new heads then a new tb is in the equation. However, its a waste of money until you start getting decent power out of the bolt on's. But, once you get there, AS&M ones are good, but remember that if you get a 58mm one, you need to port the intake out to make the holes 58mm, cuz they are only 52mm stock.

 

A larger TB on a stock engine will actually cause a loss of power.
I would not recommend upgrading it until you have at least headers, catback and a CAI. Then I would go to a 52.

If you plan on also porting the heads, intake and doing a cam, get the 58 and have the intake bored to 58 when you are having the work done.

 

Cool, I'll put the TB purchase waaay on the backorder then.

 

The stock TB is (i think) 48mm. The holes in the intake manifold are 52mm. No modification to the manifold is required to go to a 52mm TB.

if you want a 58, get out the hole saw, you have some aluminum to remove. You will need to remove the manifold to do this, so you might as well wait and do it with the ported heads/ cam stuff.

 

Yep, stock TB is 48mm. And like he said, until you start doing more stuff, its not necessary.

 

you would be correct

 

This is a pic of a Holley 58mm TB on a stock LT4 intake.

Stock LT4 holes are only 52mm

 

Save your money for other mods...the stocker will serve you well up to 500hp.

 

Stocker good. If you do some reletively mild mods, a 52 gives you comfortable feeling, but whatever you do stay away from a Holley. Factory fitment not that good (rumor).

 

do you have any proof of this?

 

I wonder if it has to do with the velocity? Since a stocker only requires 600 something and a mildly modded engine with good heads might use a bit more, wouldn't a 58, which flows around 1K provide too much which is not going to be used anyway and will be traveling at a slower rate, thus reducing the ability to pack the intake and increase the charge, or perhaps the whatchamacallit could interfere with the thingamagig, thus causing extreme depression of the phychomoto reaction which mostly relies on increased barometric cycodrama.

Just a thought.

 

lol
but i would think you are restricted farther down stream anyway with the MAF only allowing so much air to go thru it
so i can see the loss of velocity as it opens up once it reached the larger TB
but either way the head and cam is only going to suck in so much air thru the intake runners, i would think that the velocity the air is at once it entered the runners is gonna be at a certain speed regardless of how much is allowed in thru the TB intake and track??
i really have no clue what i'm saying but just something i had thought of! correct me or add to it please dont flame

Steve