Hi

I am planning to put a 5.3Vortec and 4L60E into an older car (maybe a 67 Firebird convertible).
I have bought two engines that will come to Norway (where I live) I about a month or so.

They are both claimed to be 2006 model 5.3 Vortecs with 320hp

#1 has under 2000 miles on it. And it is supposed to come with the gas pedal assembly and fuel pump. It comes with stock computer and wiring harness.

#2 has around under 20000 miles on it and is a E-85 engine. And that one will also come with the gas pedal and fuel pump. It comes with a reworked wiring harness (Hotrod controls) and a computer programmed for 95 octane (most common in Norway)

The seller of engine #2 even included an extra reworked wiring harness and reworked computer (95 octane) for my #1 engine (that I bought from another place)
I have also bought two sets of Gen1 small block to Gen3 small block engine mount adapters.

Well… here is my plan so far….

I will sell engine #1 including the extra wiring harness and computer that I get with engine #2 to my brother or my father. So that engine and trans combo will go into either a 1967 Chevelle or a 1981 Chevy truck (that gets around 6 miles to the gallon now :O)
I think this will be a fun project to join for me as a firs timer on this conversion.

My plan with engine #2 is to Install it into my 1967 Pontiac Firebird Convertible witch now has a 400engine and TH400 trans (or into something else if I sell the bird and buy some other cool old car)
On this engine I would like to add headers and dual 2.5 inch exhaust.
And I would also like to upgrade it with a Magnacharger Radix intercooled supercharger.

I am hoping to make 400rwhp with the supercharger and headers. Will I make it?

Should I go with another supercharger? KB, whipple or something else? (I like the Radix for to me it looks like I can keep the stock truck front accessories)

How tall will the Magnacharger be compared to the stock truck intake?

I think I can get the Radix for around $5000, will that make the biggest bang for the buck? (tq down low and good average hp) (except nitrous of course)

What about vacuum for the power brakes, how do I deal with that?

Is there something I haven’t thought about?

Thanks for your help.

 

Don't know if you've checked out the "conversions and hybrids" section over on tech but it's a wealth of information for swapping LSx motors into older cars:
https://ls1tech.com/forums/forumdisplay.php?f=28

As far as the supercharger situation goes you'll be making alot more than 400 rwhp which is good news. I don't think the radix would fit under the stock hood, but the part that may be more of an issue is the J tube at the rear of the supercharger. You may have some interference with the firewall depending on what motor mounts and adapters you use and how far back the engine sits. You may be better off using the kit designed for the trailblazer which uses truck acessories but front throttle body inlet or possibly even the gto kit if you relocate the idler pulley by the alternator. You should have plenty of vacuum for power brakes, just make sure there is a good check valve in line to the break booster so it is not pressurized under boost. Alternatively you could go with a hydroboost setup that uses the powersteering hydraulic pressure to drive the power brake system. I would check out the section I mentioned above as well as the forced induction section over on ls1tech.com. A few guys are running magnachargers in 4th gen camaros and clearing the stock hood. If they can make it work in that chassis you can make it happen in the firebird....good luck.

 

Good advice he should use the TBSS or SSR system so that he does not need to change any of the FEAD.