Bigblock + boost??

xoxbxfx · Jan 21, 2004

Well, I still want to do my 5.4 DOHC motor but Im reconsidering. Anyone have any thoughts on a 460based motor (probably will be 514) and a turbo setup??

C.Harris · Jan 21, 2004

Wow! Now that would be a project that would get some serious attention IMO! The 429/460 engines are seriously stout pieces even in stock form and their potential is through the roof. Any car with such a powerplant would be an animal! I could easily see 500-600 horsepower in even a low boost application with some well chosen components. Parts are, on the whole, cheaper than the mod motors and the benefits in the hosepower/torque dept. with doing upgrades on a big block compared to that of a 4.6 or even a 5.4 is like night and day...just my $.02!

The IS no replacement for displacement! Mod for mod the big block will walk off and leave everything else behind...too bad for the Mustang they went the way of the dinosaur. Luckily I'm working on a well modded, nitrous assisted 460 BBF anxiously awaiting its turn in the engine bay of my '71...

3spd on floor · Jan 21, 2004

got torque?

Fostang · Jan 21, 2004

I've seen a 460 station wagon TT'd.

Didn't make much hp like 350 hp but it pulled out 700 lb's of torque. Got that 4500 lb wagon doing a 12 on the quarter.

He used 2 garret turbo coupe/svo turbos. Doesn't run the car past 5500 rpm to avoid over spining the turbo's. tranny is a c6 with 2500 rpm stall and see's no turbo lag. It's a boxed in carb set up. All home made.

Ya damn thread hijacker!lol I saw you trying to get my diagrams also LOL Don't think that just by changing your screen name you can fool me. HA!

BTW PAWS sells a nice Dinasour or Godzilla BBF kit.

SandSprite · Jan 21, 2004

http://www.undrprsr.com/fairmont/

that guy has a TT EFI 460 in a fairmont.
I think the 460 is beefier than a stock 5.4. not sure how stock internals do with boost on a 5.4. I know the cobra 4.6 has forged internals, but the others aren't.

Good luck out your project-- sounds cool.

67GTA-FB429 · Jan 21, 2004

I have a 429 in my 67. It makes awesome power. Put about 6K in the rebuild. It is normally aspirated, points ignition and I dyno'd at 372rwhp and 490ft-lbs this past summer. Parts are expensive, and there is not a lot of room to work on it. There is a reason the pushed the shock towers out on the BOSS429.

xoxbxfx · Jan 21, 2004

67GTA-FB429 said:
I have a 429 in my 67. It makes awesome power. Put about 6K in the rebuild. It is normally aspirated, points ignition and I dyno'd at 372rwhp and 490ft-lbs this past summer. Parts are expensive, and there is not a lot of room to work on it. There is a reason the pushed the shock towers out on the BOSS429.

I plan on doing a MII front suspension anyways...

I remember reading somewhere that doing a bigblock and boost was not a good idea somewhere.

67GTA-FB429 · Jan 21, 2004

I have read that 429/460s like nitrous. That is not for me though, I am planning on an old-school approach eventually, low-rise dual quads.

SadbutTrue · Jan 21, 2004

without a doubt the 460 would make more power, but a 5.4 would be far more of an accomplishment and might provide all the power you'd need... and Kenne Bell on top of a 5.4 could have you at 700whp (since 4.6s with KBs can net 600, on the new cobras anyway)

And it also would be easy (well, relatively) to net 1000 hp with the right combo of aluminum heads, high revving motor, big blowers (or a coupe of them) and a stroked 460.

Lots of potential to both

xoxbxfx · Jan 22, 2004

SadbutTrue said:
without a doubt the 460 would make more power, but a 5.4 would be far more of an accomplishment and might provide all the power you'd need... and Kenne Bell on top of a 5.4 could have you at 700whp (since 4.6s with KBs can net 600, on the new cobras anyway)

And it also would be easy (well, relatively) to net 1000 hp with the right combo of aluminum heads, high revving motor, big blowers (or a coupe of them) and a stroked 460.

Lots of potential to both

I was thinking the same about the potential part. The 5.4 had some advantages compared to the big block in my eyes. First off like you said, its a big accomplishment to do something like that. The other things I was looking at are engine parts. You can get a stock forged crank from ford thats is right around $550 and you can use stock Navigator heads and port them. My buddy is going to hook me up with a junkyard Navigator 5.4 which will have a forged crank, heads, and all the EFI sensors for $400. Hell of a deal. Then add in around $1300 for rods and pistons, $1000 for assembly, $700 for head porting, $1500 for cams and springs, and $500 for rings and bearings. Total is around $5000 for engine build. The fuel injection stuff is the same as on the 4.6 and a local guy is going to build a custom sheetmetal upper for a few hundred bucks. I would hope to push 700rwhp out of the 5.4

Now the bigblock, you get huge displacement numbers and amazing torque. I could only imagine adding turbos on a bigblock. The torque is going to be outrageous. I would ahve to do a FAST setup for the fuel injection ($2k) and get a sheetmetal upper or go Spyder intake. I believe the fuel rails will have to be custom and then throw in $6k like said above for a build.

I think Im just going to trade my 393 with my friend for the 5.4, a 98 cobra computer, and set of chrome bullitts.

67GTA-FB429 · Jan 22, 2004

Also, you have to get all of the torque and horsepower to stick when you need it otherwise it is just fluff.

Bigblock + boost??

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