hello my name is matt

well I get straight 2 it. I am lookin to by a engine block, I cant decide between a 350 or a 400, I whould like some pros and cons on each, also I have a 1986 Iroc z z28 with a 700r4 and a little over 100k miles well, I am going to by a block and build it piece by piece over the next year or two. and I cant decide rather or not to drop it in my 86 Iroc or a 89-91 firebird?? I dont want to change the Iroc incase it becomes more vauleable as it ages, what u think the chances are of this? is there any benifits of the Iroc over the firebird?? which will handle the power better? also I aint lookin to make a race car, just a fast reliably daily driver. hows 400 hp 450+ ft lb torque sound?? not 2 wild??

whould it be best to purchse a bare block or short block? maybe a long block

sorry 4 the newbie ness

 

by firebird you mean V6? you have to change more stuff over to put a V8 in a V6 but you can fool the insurance companies. A V6 transmission probably wont work too well. If you can find yourself an LT1 or LS1 block and build it up. Good bang for the buck with those engines. If you dont want to go that route or you want to go carb, do whatever. 350 or 400? I'd go with a 383 stroker. Whats makes the difference in handling is what aftermarket parts you put in. Definitly get subframe connectors. A car without ground effects weighs slightly less so keep that in mind if your only interested in speed. Really i dont think it matters what car you put the engine into but what you do to the rest of the car. Exhaust, tires, suspension, brakes,transmission, rear and everything else is what makes the difference. On your iroc, if it is rare - like 1 in 100 then it might be a tuff call on which car to do. Its really personal preference between camaro and firebird. Pick the one you like best.

 

thanks firebat

I meant firebird formula or t/a, sorry bout that, can I ask what makes u pick a 383 over 350 or 400? also i have heard 400 are made for torque as in trucks and towing is this true??

 

a 350 or 400 can be made for towing. The 383 stroker is really just a built up 350. If you're looking for power it really depends on what you put into the engine or have to start with already in the engine.

 

i plan on keeping my stock tpi system. will it bolt directly 2 a 400 or 383? does that affect what u been tellin me any?

 

sounds way too wild for a 700r4 you will kill one fast with that much power

 

if the 700r4 is stock...

you have to talk to the tpi guys in the tpi forum. i'm kind of sure the tpi from a 305 will work on a 350 and therefore should work on a 383.

 

yes the 700r4 is stock, well it has a shift kit anyway, but i just got it rebuilt becuz the bellhousing bolts came loose and the tranny slid back and when it did the converter got on top of the pump and kill alot of things so I had it rebuilt, this time ill be sure to include LOTS OF LOCKTITE in it when I put it back in


also when I dropped the tranny I broke the kickdown cable anybody got a estimate on how much it will cost? 2 replace it

 

20-30 for a kickdown cable. get ahold of your local gm dealer.

 

is the a certain reason why everone goes to the dealer over napa? j/w

 

NAPA will go to the dealer to get that kind of item.

 

i hate 2 get off topic but I just relized something very important,

I want all this power and torque but I have no way to get it to the ground, I need a POSI rear end with about 3.73 in it hows this sound, but the only problem is I know nothing about rear ends, I have no clue what to buy, anyone have some links or info to help me out I whould greatly appreict it

thanks

-matt

 

Go to the transmission and drivetrain forum.

 

i searched and had no luck, should I post a new thread in the drivetrain forum?

 

Maybe these will help for a starting place:

https://www.thirdgen.org/newdesign/t...nguprear.shtml
http://www.ws6transam.org/10bolt.html
https://www.thirdgen.org/newdesign/tech/mods2.shtml (bottom of the page)

They are located in the Tech Articles section on the TGO homepage.

 

thanks man, i take it that my is a 10 bolt 7.625?? right is that the size in all 3rd gens? I know my gear is like a 2.92 or close 2 it? what is the cheapest way to make it posi trac with a 3.42 gear in it?

also will the tpi setup fit a 400 sbc block??

 

7.5 or 7.625 doesn't make any difference.

Probably the cheapest way to make it a 3.42 posi is to find a used posi rear with 3.42 gears and swap it in.

TPI will fit any SBC as long as the center intake bolt holes in the heads are at the right angles. It probably wouldn't be the best choice for a big cubic inch engine though.

 

im gonna put a new intake maybe miniram or HSR, bigger injectors and throttle body along with the 406 this are my planned combinatons. or get ride of the TPI and use 2 4barrel carbs??

 

Whatever you do, don't use 2 4bbl carbs.

 

i have decided to build a 406 with a Big Mouth Tpi Base Intake Manifold, bigger runners,bigger fuel injectors, 58mm throttle body, plus more this is just my intake combination

 

Power comes from the heads and the cam, pick those first.

 

I dont know much about heads and cams that much but how does vortech heads sound? what cam should I use?