protouring mopar options? lets talk

[70Dustpan]

Right now I'm building a 67 Valiant that is going to be my daily cruiser. It has a .060" over 318 giving it 327 CID, a late model A Body 4 spd O/D with .73 4th gear, and 3.91 in a 8 3/4 rearend. I'm planning on around 325 to 340 HP out of it and 2700 at 70 MPH in 4th. It has the larger 12" C body disc brakes with .990 torsion bars, and a 1 3/16" front sway bar up front. Out back it has 11x3" C body drums and a 3/4" sway bar. It will weigh in around 3,000 to 3100 LBS with the custom 22 gal. fuel cell full. If I can get the motor to push it that fast it should be good for around 130+ MPH.
My other car is a 70 Duster with a 440/727/8 3/4 with 3.91s and 29.5x15.5x15 M/T

As for going over 140 MPH in a B Body a good buddy of mine had a 70 SuperBee with a 440-4 spd that went 150+ MPH on a regular bases.

[427]

Charley,
Not sure how to do them that cheap. I would even like the 1800 dollar headers. I have 3500 in bends and collecters to make my wagon headers. The only way to do it cheaper would be to use 304 stainless or mild steel, but then the headers would be cracking with age.

On topic. The new generation hemi would be my engine of choice. With stock ex manifold and open pipes my stock one made 360hp at the flywheel. With 7psi of boost (small Rotrex supercharger), we made 480hp (@5200rpm) on the stock engine. With pistons, rods and more boost, 600hp would be easy and driveable.


Kurt

[Majik16106]

how about scott's supercharger set-ups at sd-concepts? why not a 8:1 366 or maybe even a 408 with a procharger p1sc or d1sc? with the .030 over 360 and a forged bottom end with some nice aluminum heads, you could do 6800rpm frequently, imagine a duster or even a challenger with like a kiesler 5 speed with the .64 option. if you ran some decent sized 17s and a 3.73 or even down to a 3.55 to help control the car by giving nice wide gears, your lookin at almost 200mph, not that you'd need it, but if you ask me, thats one hell of a combo, 600hp, 200mph, it could do 11's no prob, build the right suspension, thats one heck of a street car..

[Scotch]

Regarding small vs. big-block Mopars, consider what the car will be used for. I say go stroker SB due to the front/rear weight bias. Should you decide to take this car out on a track, you wouldn't want it to be nose heavy. In drag racing this is obviously much less of a consideration but around a corner the weight becomes more critical.

An aluminum-headed stroked Mopar SB (or new Hemi 6.1) can easily make big power with boost. Back it with the OD trans you're already planning on and you'll have a well-balanced package.

I'd consult with Dick Landy at DLI or Bob Mazzolini on this one. They could certainly engineer a killer pump gas small-block that'd run where you want it to.

Extra points to ya if you go with the new Hemi...that'd be a killer...!!

SP~!

[Majik16106]

i agree 100%, if your talking about a more track minded car, but when your talking about a mostly street car and money being an issue, gotta say, big block seems to be where its at, cheaper, easier, big power. and thats a ton of fun to just drive around. I e-mail back and forth quite a bit with steve vukovich, whose small block cuda was featured in PHR, he uses a roots type blower, the motor developes some 660ish horsepower, lots of fun, but building a small block mopar, very expensive. even compared to a big block. and in mopar vs chevy vs ford world, mopar sb cars have longer strokes, rev slower, etc etc.. but i tend to see the opposite in bb cars, mopar bb cars seem faster for less than the competition. look at the engine masters challenge, the mopar wins hands down with a lot less extreme stuff... and like i said, pro-touring is street driven, some drag, some cornering, so if you go full tubular front end, to ditch the torsion, quick ratio box, nice brake upgrade, fiberglass hood.. i think you can more than justify some added weight in the front end of a bigger mopar.

[race-rodz]

Originally Posted by 427

I have 3500 in bends and collecters to make my wagon headers.

are these made from unobtainium or what

[dtedler]

I'm doing exactly as many of you have written. However, I've taken a little different approach to the driveability of the car instead of getting crazy on horsepower. I have a '73 Challenger, swapped the Keisler TKO 5 speed in last summer, 408 small block, worked the suspension a little to handle decent....notice I did not say great. Old Mopars need help cornering.

The direction that I would take is definitely into the EFI world with any old mopar, the start and throttle response is superior to any carb'd set-up. Supercharging and EFI is way cool but brings a host of upgrades that must be done to support the installation, ie bottom end, blower pistons, roller valve train...it all adds up to an expensive package for track or street.

Another direction may be the 425 horse, 6.1 L Hemi. They will eventually make it to a scrap yard near you! Mount a supercharger onto the front an go eat a few Camaro's. (sorry to the chebbie owners)

How about this... stroked small block, EFI, old school Mr. Norms GSS Paxton supercharger on top for the newstalgia flare (Big, flat black bonnet and all), 5 or 6 speed for the freeway driving and of course AIR CONDITIONING. My 2 cents.

[Majik16106]

efi is a must in my book as well, but working a mopar small block is just expensive, and the big blocks, just so much cheaper for so much more power, originally i was going to use a small block, but my mind has been changed, especially since i have a killer deal on a worked 400 block, making something like 600 horsepower, and revs super quick, the heads have some nice machining, awesome motor. and it was running 6.60's in the 8th in a 2950lb w/ driver valiant before some of the extra mods done since the pull.. so thats enough power for me, and i got it for cheaper than it would cost to rebuild a small block, much less really build a nice one. and awesome/fun street performance. plus ill give a supra turbo or a bolt ls1 car a nasty run for the money on the top end, this motor does 160mph with the overdrive a833 and a 3.55 rear like NO PROBLEM.

[70Dustpan]

Majik16106, Has a 4 spd O/D been ran behind your motor yet? And if it has what has been done to beef it up? I don't think a 4 spd O/D won't hold-up long behind a 600HP big block. 400 HP/400FT is about the safety limit with them. They are just not as strong as the A833.

[Majik16106]

oh i thought i had posted this earlier.. your right, a833 very stong, but there were o/d 833's... and even stronger than stock ones, are the ones built by passon performance.... like what is used in the hammer.. mine is a passon tranny..