Hello all,
New territory for me....
Just got my hands on an unused Offy 4bbl intake and want to convert my Super Six
Can you guys please direct me to any threads already out there where this has been done? Or give me some input as to what I'll need and how to do it?
It's going on my 78 Caravelle Super Six.
Again....new territory for me.
What I need help on is....
What's the best carb to use?
What do I do about the linkage setup?
Exhaust...
My fantasy plan is to use a 383 housing and drop my Super Six pie plate on top
I heard this would fit/work...the idea being to keep it looking stock.
Ideas on that?
I'd also like to run straight exhaust as apposed to duals.
Is that a do able idea?

Sorry for all the questions...like I said...new turf for me.
Thank you very much in advance.

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1978 Plymouth Caravelle 2 Door Boat Tail 225 Super Six
1987 Chrysler 5th ave. 318 (Daily Driver)
1980 Plymouth Volare 2 Door 225 Super Six

No takers, eh?
Kinda figured somebody here would have had done this one......

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1978 Plymouth Caravelle 2 Door Boat Tail 225 Super Six
1987 Chrysler 5th ave. 318 (Daily Driver)
1980 Plymouth Volare 2 Door 225 Super Six

The carb is going to depend on the rest of the engine, but a 390 cfm Holley seems to be the usual choice. You can probably make it work with the stock Super Six throttle cable. Offy four barrels will bolt to the stock exhaust manifold, too.

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair

It may be that we've discussed this 8 ways from Sunday and are getting old, tired and cranky. An Edlebrock 500 will likely make you happier than the 390 Holley, but it's really a waste to go from a perfectly functioning 2bbl to a 4bbl without taking care of the other, more significant, restrictions in the system first such as the cylinder head and exhaust system.

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Joshua

Ditto what Josh says. On an otherwise stock motor the two barrel Super Six setup is actually better than a four barrel.

Thank you very much for the replies guys.
I kinda figured this had been covered a few million times
New turf to me though and I don't know where to look.
If anyone has any links that I can read up on I can leave you guys alone on this one.

I was thinking of doing the intake, carb and headers.
I was thinking that would be better than the stock setup.....no?

Either way...thanks for the input.
Much appreciated.

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1978 Plymouth Caravelle 2 Door Boat Tail 225 Super Six
1987 Chrysler 5th ave. 318 (Daily Driver)
1980 Plymouth Volare 2 Door 225 Super Six

Use the search button on this board to find two and four barrel conversion as well as every other conceivable slant six modification discussed ad infinitum.

Short answer:

For a street motor, a two barrel carb, Dutra Duals rather than headers, increased dynamic compression ratio, possibly a bigger cam, possibly bigger valves and/or head porting, increased diameter free-flowing exhaust, HEI ignition upgrade, recurve the distributor, is a good basic starting point.

Once again....
Very much appreciated.
I've been a slant junkie for a while as you can see by my cars...just love them
But this is a new undertaking.
I'll do my searching....
And thanks so much all of you for helping out the newbie.

_________________
1978 Plymouth Caravelle 2 Door Boat Tail 225 Super Six
1987 Chrysler 5th ave. 318 (Daily Driver)
1980 Plymouth Volare 2 Door 225 Super Six

We've all been there. We are just getting a little crusty is all.

Understood.....
Getting a little ornery myself in my old age....

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1978 Plymouth Caravelle 2 Door Boat Tail 225 Super Six
1987 Chrysler 5th ave. 318 (Daily Driver)
1980 Plymouth Volare 2 Door 225 Super Six

I think if you were going to pick one of your rides to be the hot rod, this would be the better platform.

You'll need a rear axle swap to better gears 3.21:1.
You'll need to score a Lokar kick down setup if an automatic.
The offy is fine, save up for dutra duals.
Land an Edelbrock AVS 500cfm.

I'd look hard at rebuilding the engine for a mid-9:1 static compression ratio
and an 8:1 dynamic CR. I'd grab an 819 grind from OCG for the build and dial for a 102 intake centerline for lowend torque to haul the heavy late model car.

That should work as a baseline to get your easter eggs together, before considering the swap.

-D.Idiot

Thanks greatly D!

Just curious....
Isn't my two door Caravelle essentially the same thing?

Either way...thanks for the info.
A bit of it is still a bit french to me but I'm sure my buddy who builds race engines..
The one helping me will decipher what I don't get.

I very much appreciate all of your advice and help guys.

Thanks!!!

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1978 Plymouth Caravelle 2 Door Boat Tail 225 Super Six
1987 Chrysler 5th ave. 318 (Daily Driver)
1980 Plymouth Volare 2 Door 225 Super Six