have 92 firebird w/305, what engine with most horsepower will fit without modifications

 

Mods to what ?

This one will bolt straight in place of your 305
http://www.hotrod.com/techarticles/e...e/viewall.html

 

Any sbc with more cubic inches than 305 with more compression, better heads and intake.
Better yet do a LS with a turbo.

 

But that requires "mods " ; is not a drop in replacement using stock parts like a reg SBC

 

Welcome aboard thirdgen.org.

The real answer is "None". Some modification will be required to support an engine with more power.

Now, like the others asked, what is your real question? And, which 305 do you have?

 

The engine is a stock pontiac 305 efi from the factory, I have been told a
355 or 383 stroker would bolt to stock transmission, but I am not sure,
I was wanting the most horsepower without getting in deep with lots of required modifications

 

A 383 may bolt up to your stock Trans, but the Trans won't last long. I'd say much more than about 300hp and you'll be downing money into a transmission. If you want to stay sbc, you can buy miss that will transfer over later, such as headers, upgraded transmission etc. then when you have the money, you can swap in some awesome built motor. Or just save up for an Ls swap down the road

 

Thanks for info, good advice

 

92's only had EFI. There were 3 different 305's offered: the base 170 horse TBI, 205 horse TPI with small exhaust and single cat, and the 230 horse TPI with dual cats and larger exhaust. Either of the first two would require a complete exhaust upgrade to support more power. The 3rd would still benefit from exhaust upgrades.

Not that it makes a lot of difference, but at the very least, TBI is not capable of much more power than the factory had without extensive (and expensive) mods.

Okay, understand I'm not picking on you, but that question is asked a lot. And, there is no good answer.

For starters, we have no idea what "lots of required modifications" means to you. As already stated, transmission and exhaust upgrades should be considered a given.

From there, are you talking about expense, effort, number of parts that have to be changed, suspension/chassis mods? For one person, the expense isn't the issue, but the amount of effort. To another, if you can't just unbolt the current engine and bolt in another, that would qualify as "lots of required modifications". Converting from EFI to carb could be considered a lot of modification (it doesn't happen to be legal, but a lot of 3rd gen owners do it).

For sure if you have the base TBI engine, you are in for a lot of required modifications if you want to bolt in a 383. For that matter, the stock TPI would not handle a 383. Regardless of your current engine, computer modification will be required (and that includes modifications if you eliminate the computer).

And, we also need to have a better understanding what you want to do with the car. The recommendations for a daily driver will be completely different from those for a dedicated, trailered race car.

 

Get a 400. Look on eBay or craigslist. Something that's already got a decent cam, heads, then just supply some headers and put it in

 

Thanks, u have it covered, I was thinking of street hp, and I understand
it will take lots of mods, so I will give further consideration to my project