Supercharging

[65er]

Care to toss out a guess on HP and torque output for this combo? Point out any serious issues such as the pistons or rods not being up to the job?

390, std bore, std stroke. Flat top hypers, moly rings
mill piston tops to dished shape for 8.5:1 CR. (enlarge valve reliefs to a single larger area basically)
Stock 390 rods, upgraded rod bolts.  Notch cylinder walls at exhaust valve locations.
C4AE-G heads, smooth and blend ports, no hogging.  Polished combustion chambers, unshroud exhaust valves. Good valve job, stock valve sizes.
Hydraulic roller cam approx 230 @ .050 (custom grind to suit)
6-71 blower geared for 7psi (at what RPM? I have a lot of reading to do...)
Port fuel injection, Megasquirt controller
Throttle body unknown, open to suggestions...

 

[fe66comet]

I would say 500 or in that neighborhood based on a 375 HP stock 390 running 7 lbs of boost but there a lot of variables such as ignition , exhaust and induction?

[jayb]

I would also say about 500, but a minor cam upgrade and boost upgrade would easily get you to 575.  Go to 9 psi and maybe a 242@.050" cam.  That will be plenty safe and drivable.  Much more power than that and you will have to start thinking about crossbolting the block for longevity, and all that...

By the way, think WIDE lobe separation on the cam for best efficiency with a supercharger, like 114-116 degrees.

[65er]

Just to help fill in the blanks...

Exhaust - Crites headers with 2" primaries, 3" dual exhaust to mufflers, H-pipe, 2-1/2" tailpipes over the axle
Ignition - crank trigger/coil packs, megasquirt controller
Induction - A supercharger! heh... what's ahead of the supercharger is TBD.  Probably either a 4V throttle body or maybe a pair of throttle bodies similar to the one in the linked Ebay auction.  I think the pair of 2's could be set up with 4 holes in a row and I would have to fab some sort of air cleaner.  Maybe something like a ram's horn shaped thing with a cone-shaped filter aimed toward each of the headlights.

575 HP potential with parts from under the bed?  WOOF!  This one looks like it's going to be more than a daydream, I could actually do this without too much trouble.  First off I need to figure out how to make it fit.   Anyone have a height measurement available?  Need to know from the top of the china walls to the carb mounting flange I guess...

[fe66comet]

The vendors have blueprints they will gladly email or fax to you with your desired setup.

[BruceS]

65er,
Don't forget Jerry Magnuson @ Magnacharger.  http://www.magnacharger.com/.  He uses the roots type blower in his applications. He builds nice hot rods, too!  Back in the 70s I bought a Weber carb conversion for my Harley Sportster from him... He was doing superchargers for Harley's back then too.

Btw, how about a quick update on how that new tranny is performing?  Curious Galaxie owners would like to know!

Bruce

[65er]

The TKO is a champ as expected Bruce 

With the old cruisomatic misbehavin' as it was I never could put the hammer down for fear of blowing the tranny out. Now I've been burning a bit of rubber here and there with no worries and am ready for a few more horses under the hood

[machoneman]

Guessford does a 6-71 FE 427. Nice pics and a very complete BOM with prices. Just ignore that burned rod journal.....LOL!

http://www.gessford.com/cobra/images/KeithSmith427.htm

[fe66comet]

Keep in mind torque levels also rise with a supercharger, even more than HP in many cases so drive train upgrades are necessary in most cases. The TKO is good for 5 or 6 hundred pounds. You for sure will need 35 spline axles also, 28 spline will snap like a pretzel rod.

[Faron]

If you want drop me your phone number at TotalPerEntofPa@aol.com , will gladly discuss Roots 671 FE combo's been running it since 1987 , lots of good advice posted , BUT there are a few that are NOT so good

[65er]

Thanks Faron and thanks to all of you guys.

 I saturated myself this weekend with info on supercharging and between all the fab work, expense of doing it right, and the prospect of having to cut a hole in my hood, which I don't want to do, I think I'm going to be best off with plan "A" which was to build a nice stroker FE with some good head work.  As I had mentioned, I'm currently not far from being satisfied with what I've got.  If I get the stroker together with something like 450 HP and really nice stout bottom end torque output then I'll be ready to move on to restoring the interior and other non-drivetrain aspects of the car.  If sometime later on down the road I itch for more then I can build it onto the stroker motor instead of starting over again.

[fe66comet]

A normally aspirated 445 cid FE set up properly will easy put out 600. But heads are going to be a necessary upgrade.

[Chad D]

If you want drop me your phone number at TotalPerEntofPa@aol.com , will gladly discuss Roots 671 FE combo's been running it since 1987 , lots of good advice posted , BUT there are a few that are NOT so good

Isn't the purpose of this board to share knowledge and have an available repository, not direct traffic away?  If you have information that contradicts the good advice already shared, why not post it here?

[jayb]

If you want drop me your phone number at TotalPerEntofPa@aol.com , will gladly discuss Roots 671 FE combo's been running it since 1987 , lots of good advice posted , BUT there are a few that are NOT so good

Isn't the purpose of this board to share knowledge and have an available repository, not direct traffic away?  If you have information that contradicts the good advice already shared, why not post it here?

+1 on that.  Come on Faron, let's hear it! 

[fe66comet]

I never said I know it all. If I did I would be.in a very lucrative business making all the aftermarket parts and would be engineering all new vehicles too.