Building a 2005 Boss 429

I take posession of my new 2005 Mustang GT next week. With less than 30 miles on the odometer, I'm pulling the 4.6L motor, reworking suspension fore and aft, voiding all my warranties and dropping a reconstituted 429 hemi and slightly modified Paxton Supercharger into this puppy.

Expected horsepower=600+... I can't wait to fire the mother up.

It'll also have a GTR front facia (a better match for the '69 and '70 Boss).

I have waited 30 years for Ford to get its act together and I'm not waiting any longer. Wish me luck... who knows, maybe you'll see my 2005 Boss 429 on the cover of Road & Track. Wouldn't THAT be sweet? :naughty:

I take posession of my new 2005 Mustang GT next week. With less than 30 miles on the odometer, I'm pulling the 4.6L motor, reworking suspension fore and aft, voiding all my warranties and dropping a reconstituted 429 hemi and slightly modified Paxton Supercharger into this puppy.

Expected horsepower=600+... I can't wait to fire the mother up.

It'll also have a GTR front facia (a better match for the '69 and '70 Boss).

I have waited 30 years for Ford to get its act together and I'm not waiting any longer. Wish me luck... who knows, maybe you'll see my 2005 Boss 429 on the cover of Road & Track. Wouldn't THAT be sweet? :naughty:

i hope you mean 'boss 429' instead of '429 hemi' =D. that should be sweet!

and u would be on the cover of musucle mustangs and fast fords sense your car wouldnt be a production car nor is a turner car. but good luck have a bunch of fun and :1: that the engine is a 429 boss or a corba jet engine not a hemi.

yeah it cant be a hemi.

I take posession of my new 2005 Mustang GT next week. With less than 30 miles on the odometer, I'm pulling the 4.6L motor, reworking suspension fore and aft, voiding all my warranties and dropping a reconstituted 429 hemi and slightly modified Paxton Supercharger into this puppy.

Expected horsepower=600+... I can't wait to fire the mother up.

It'll also have a GTR front facia (a better match for the '69 and '70 Boss).

I have waited 30 years for Ford to get its act together and I'm not waiting any longer. Wish me luck... who knows, maybe you'll see my 2005 Boss 429 on the cover of Road & Track. Wouldn't THAT be sweet? :naughty:


I doubt you will see a 2005 mustang with a DODGE engine on the cover of any FORD based magazine. I take it this is going to be a trailer queen too.

I take it this is going to be a trailer queen too.
Thats exactly what I was thinking. Not discouraging it tho, id love to see it.

My god. Does anyone else know that the 429 in the Boss 429's used hemi heads?

Either way, sounds like a pipe dream and I'll belive it when I see it.

My god. Does anyone else know that the 429 in the Boss 429's used hemi heads?

Either way, sounds like a pipe dream and I'll belive it when I see it.


When stating HEMI, that's DODGE's marketing slang for when they came out with their own version of the Hemispherical heads. So it is assumed that when the abbrivated form of Hemispherical is used aka HEMI, it is also assumed that someone is talking about a DODGE since they own that trademark and logo. I am personally assuming that someone is taking a 426 Hemi and over borring it to a 429.

Sounds like a buncha shit, but eh...whatever.

three things:

dampachi - why do you bother to leave posts?

silverstangs - if you are going to get into particulars:
it isn't unreasonable to call any hemispherical headed engine a hemi, just as it isn't unreasonable to call any dude named daniel dan.
Chrystler didn't develop the hemi for use or license to dodge strictly, for example its debut was in a 51 saratoga.
HEMI can be seen in advertisements for plymouth, chrystler, desoto(technically) and dodge with the street 426 being released and promoted as HEMI for both plymouth and dodge and today chrystler rubs hemi all over their new hemi powered cars as much as dodge does.

headlesshorseman - god speed, the new 05s are dope and i'm sure that any project on one this early in the game will spark an interest.

What do you mean? In this particular thread? Well, since I'm taking a break from swapping in a twin turbo'd jet engine into my mustang...I decided I'd post some on this forum. Wow, hopefully when I'm done I'll have my car pictured on the cover of Aviation Monthly! Yay! :rolleyes:

My god. Does anyone else know that the 429 in the Boss 429's used hemi heads?


My thoughts exactly.

For the non-believers....
http://www.jonkaaseracingengines.com/engines.htm
http://www.jonkaaseracingengines.com/heads.htm

Yup, it's a hemi... Does anyone remember the Dodge K-cars that said HEMI on the side? It's used many ways by many people.....actually, even the early escorts were hemis!

My God you people are jackals.
http://www.theoldone.com/boss429head/BOSS429AR1.jpg
That is an aftermarket Boss 429 head. If you know what 'Hemi' actually means, you know that those are indeed 'Hemi' chambers. If you don't know what 'Hemi' means, keep your mouth shut. Just because Mopar marketed the living hell out of the name isn't Ford's fault. Those heads are not actually the same as the production Boss 429 heads, which have small quench pads on either side of the valves, hence the nickname 'semi-hemi'.



It sounds like an awesome project, but I'd shoot for more than 600hp. With those 'Semi-Hemi' heads you should easily be able to make 650-800hp without any boost or nitrous - with a supercharger, 800-1200 would be quite attainable.
HeadlessHorseman, I wish you the best of luck. I notice you're from New Milford, CT; I'm from Farmington. If you need a hand, shoot me an email or PM, I'd love to help out.
Oh, and one more thing - May I recommend the Tasca Boss 429 paintjob?
http://www.turboslut.net/tasca.jpg

Yep, the Boss '9 had the unofficial nickname of "semi-hemi".

Dodge K-cars with Hemi on the side? That's new to me, and I like to think I'm pretty knowledgable about K cars, having done a G-body buildup. A lot of TD's had Shelby or IROC R/T or GLH/GLH-T/GLHS on the side. I don't recall ever seeing "hemi". The 2.2/2.5 is a slant 4 with either a bathtub or a fastburn combustion chamber, depending on year and what size turbo. Visit the SDAC show if you want to see those...

My god. Does anyone else know that the 429 in the Boss 429's used hemi heads? Either way, sounds like a pipe dream and I'll belive it when I see it.Yes, the Boss 429 had/has hemi heads and I'm kind of surprised that fact isn't well known on this forum. "Semi-Hemi" always impressed me as marketing hype anyway. C'mon now... we're all friends here, right? Who cares anyway... I learn something new every day and I've owned Mustangs since '65. :naughty:

When stating HEMI, that's DODGE's marketing slang for when they came out with their own version of the Hemispherical heads. So it is assumed that when the abbrivated form of Hemispherical is used aka HEMI, it is also assumed that someone is talking about a DODGE since they own that trademark and logo. I am personally assuming that someone is taking a 426 Hemi and over borring it to a 429.You're kidding right? I think my heart is palpitating... I would NEVER put a mopar motor under the hood of a Mustang.

O... M... G...

My God you people are jackals.
http://www.theoldone.com/boss429head/BOSS429AR1.jpg
That is an aftermarket Boss 429 head. If you know what 'Hemi' actually means, you know that those are indeed 'Hemi' chambers.Exaaaaaaactly! LOL.

that will be an awesome car, sounds good to me.

SVTCobra, I can't recall the exact year or model (I lived through the '70's, what do you expect), but it may have been an Aries that said HEMI. It actually referred to (really pushing my memory here) a Mitsu engine. A 2.6L or something. Not to get too far off subject, but is SOHC engine a hemi? I mean the 60's 427 version, not the new stuff.

three things:

dampachi - why do you bother to leave posts?

silverstangs - if you are going to get into particulars:
it isn't unreasonable to call any hemispherical headed engine a hemi,.


It's not that I am trying to be unreasonable..... but considering the amount of mustangs I have seen with Dodge and lots of Chevy engines in them, I always question things when I hear Ford and Hemi used in the same sentence. Hell just recently I seen a 66/67 mustang with a Toyota Supra engine in it.......

That's why I made the comment, I seriously wouldnt be surprized if I saw a Dodge Hemi stuck into a Ford.

You're kidding right? I think my heart is palpitating... I would NEVER put a mopar motor under the hood of a Mustang.

O... M... G...

I wish I was kidding..... I lost count on how many mustangs I seen with engines from other makers. I have seen about 6 or 7 mustangs with dodge engines in them and atleast a couple dozen with chevy engines in them. Hell I had a few bad dreams where I was dreaming about working on my car, and I popped the hood and there was a SBC in the engine bay.....

Just do me a favor...... just say Ford Hemi..... that will help lesson the fears I had....

I'm sorry that I thought you was thinking about a dodge.....but after seeing that done in a few times..... it really wouldn't surprize me.

ok, i can see where you are coming from for sure.