im wanting to build a turbo big block for my 69 i know im gonna need to upgrade the suspension and tranny the whole drive train but my question is should i go with a built 454 or 502 to turbo.

 

Well they say there's no substitute for cubic inches,guess it all depends on how bad you want to scare yourself and how much fuel you want to burn.
What not go with a 572?
There's not a huge difference in displacement between a 454 and a 502,either size big block with a turbo is going to be a hell of a lot of motor for a street car.

 

im not to worried about fuel i just like to know ill be able to take any car i want without a problem as for a 572 ited be all kinds of fun but too much money to build.
probley just gonna go with the 454 after shopping around.but should i use a twin set up or a single turbo.

 

Well you kinda answered your own question,it's all about the money spent.
Unless you're Bill Gates there's always going to be someone with more money so I'd forget about this.
"i just like to know ill be able to take any car i want without a problem"
You need to establish your budget and talk with the best tuner/builder you can hook up with then see what's going to give you the most bang for your buck.
572" motors are expensive but so are turbos especially twin turbos,might be cheaper to go big on the motor and add a NO2 setup but I don't know for sure.
Whatever size engine you go with if you are going to enhance it with NO2 or any kind of turbo or supercharger you 'll need to have the right (read expensive) internals or it'll be short lived.

 

thanks for the advice ill keep it in mind im going to be building the motor myself so im just grabing advice whare i can but im gonna make sure to build a real strong bottom end so it dont blow the crank into the ground lol you pretty much gave me the advice i need thanks

 

you want to own pretty much anything on the street??? here's my advice, 468ci BBC with a single 106mm turbo. at 30psi, you should be looking at around 1300-1500rwhp, not many cars on the street run that high of power. really, it's becoming obvious that the really BIG big blocks (aka 500+ cubes) are becoming slightly obsolete, they have trouble turning the higher rpms and keeping up with the smaller big blocks.

 

Or the bigger small blocks like an LS 7 or LS 9.

 

the LS9 is a 376 iirc, the LS7 is a 427.

 

The LS7 makes a hell of a nitrous baby or high compression NA motor but for FI (forced induction stick with a LS2 or better yet a L92 iron block stroked to a 402. The LS2 is lighter and can be sleeved to hold some big power but the 6.0 iron blocks are what most of the big power guys are running. Of course there is a lot of cost that goes into building a LSX and thats with out turbo parts. Just to build a strong LSX from the ground up your looking at about 8 grand in just the enigne. You will still have your choice in transmissions but your going to need at least a built TH350 or i would recomend well built TH400 or even better 4L80. Your also going to need a built 12 bolt or a 9inch. And if you are building a LSX you might as well go fuel injected to help manage boost, timing, and your AFR to get her down the track safe. Then your going to need about 6-8 grand for your turbo set a 88 trim should do just fine for making 1XXX horses.

So by the end of the day i would say you would only have about 25000 in your drive train if you do most of the work your self. Of course your still going to need suspension, roll cage, brakes, and tons of misc other crap.

My advice if your trying to go fast cheap and working on a budget would probaly be a nitrous feed 383 with a solid TH350 and a good 12 bolt with a spool or at least posi.

 

Oh the reason the LS7 doesnt make a good choice for high horse power FI aplications is the cylinder walls on the 427 are not all that think or forgiving. Even on fully forged LS7s you are limited by the cylinder walls and as you go bigger to say a 440 you have less and less room for detonation and run the risk of spliting the block. This is why most big boost guys sleeve the LS2 or go to a iron 6.0 block.

It is important to note that the LS7 is not a bad block to build with. Expensive to say the least but for for a bad *** street engine you can make 600 to the wheels very easy on a very street friendly set up that isnt scared of less then perfect pump gas or changing temps.