New respect for the slant 6

[Rodney Bullock]

I had my mind blown this week. A guy had a 1936 Plymouth Sedan with a slant 6, 904 with dual two BBL's. I was told that the motor was HP. They had a term for it. I think they said strip pack and race pack. Anybody ever heard of this? I did not know the Slan 6 motors were that potent. He said it was a 110 mph car.

[greg g]

Rodney the factory never did a dual 4 bbl /6. They did do a 2bbl hyper pack, and a 4bbl varient for Nascar compact class in the early 60's.

scroll through this thread for a Valiant wagon darg racer with after market 4bbl set up and the red Valiat with the Nascar parts, and a link to the NASCAR stuff.

http://www430.pair.com/p15d24/mopar_forum/showthread.php?p=202383#post202383

[55 Fargo]

Yes I have heard of hi-perf aluminum slant 6s, they can be beefed up pretty darn good.....Fred

[Tim Keith]

Hyper Pak was a dealer installed package, but not many were sold. After the LA V8 motor became an option in A bodies there was little interest in increasing the factory power of the slant six. Doug Dutra re-cast the H/P manifold several years ago, made a few, then sold the patterns to Clifford, who did not do so well with them. The only "high performance" OEM manifold in the USA was the Super Six (2 barrel with Carter BBD). Other than that the later slant sixes have cast iron crankshafts with hydraulic lifters, and the low deck 170 was dropped, there are relatively few changes over the years. To gain power increases from the slant six is reasonably straightforward. Camshaft, compression increase and cylinder head work are critical for high output as the ports are constricted and valves are relatively small. Doubling of the EOM output is feasible without going to extremes. A 125 HP 225 seems pretty peppy compared to stock. The slant six practically begs for supercharging but few choose that option. Go to www.slantsix.org for expert advice.

[old rat 49]

Just the upgrade to the SUPER SIX 2 barrel intake and larger exhaust makes a big change. Like adding two more cylinders. Really noticable when passing at speed. Bulletproof engines.

[Plymouthy Adams]

many years ago when I owned a few slant 6's..I think at that time the slant 6 1/4 miler was about 176 MPH with todays technology and avancement..I would think that is far surpassed today if one was willing to go to the time and expense bear in mind that this was 70's era

[greg g]

The aluminum block was not a performance option. It was anexperiment by Chrylser to test the technology. They were put into cars randomly on the production line. Dealers didn't even know that some of their cars were thusley equiped. There are still a few around, I believe all were 225 and were done in late 61 early 63, then discontinued as mysteriously as they appeared.

[martybose]

The aluminum block was not a performance option. It was anexperiment by Chrylser to test the technology. They were put into cars randomly on the production line. Dealers didn't even know that some of their cars were thusley equiped. There are still a few around, I believe all were 225 and were done in late 61 early 63, then discontinued as mysteriously as they appeared.

The guru on these things on another forum has said that most of them had problems with porosity causing leaks.

Marty

[dezeldoc]

The problem with the aluminum block was the cylinders would "walk" at the top of them as they had no support because of the cooling passages and in turn they would loose head gaskets. not HP friendly at all. the slant six can be built into a pretty good hp level and live. i have all the parts to build a stroker motor for my kids 64 Valiant that he scattered some years back when he put a little to much NOS to it and took out # 3 piston. the thing blew at about half track and still turned something like an 12.60 or something like that.

[Niel Hoback]

Somewhere in this computer I have pictures taken at a show where a fellow had a slant six with a turbo-charger on it. I asked him what it was from and he told me it was stock on a larger Dodge truck equipped with a /6. He said he had another set-up like it at home.

[jd52cranbrook]

[Plymouthy Adams]

in 1960 the 148 HP 170 CI Hyper-pak was introduced..as Greg says, NASCAR had just sanctioned a special race division for 6 cylinder cars..this was held at Daytona..7 prepared Valiant hyper-paks entered and at the end of the race all 7 crossed the finish line, they placed 1,2,3,4,5,6, and 7..clan sweep of the first 7 spots..in '61 the hyper-pak was carried to the 225...none of these parts are available through Mopar Perfromance (old Direct Connection) these days..

[Niel Hoback]

After much searching, I found four pictures of a slant 6 with an inter-cooled turbo-charger. I would have liked to see it running.

[Rodney Bullock]

YES, you guy's are the best. There is an outfit in West Virginia that is putting these motors together for hobbyist. The Turbo-charger is an option with them as well. If you back this thing with a 904 mopar trans you have the makings of something truly great.

Putting these motors in an antique is very intriging. I have some idea's and a 1939 Chryslar sitting idle. It looks like I must fire up the star ship to boldly go where no man has gone before:) You knoiw this is going to be great.

[Tim Keith]

Nothing wrong with the alloy block if you find one. The corrosion

is common around the iron liner and the open deck. This is due

mostly to poor maintenance. Irregular coolant flushes is the big

culprit. Sealing of the head gasket is almost impossible when

this corrosion is present. Other than corrosion the alloy block

can be pretty much treated like the iron block, just make sure

you carefully inspect the top of the deck before you purchase.

Most alloy blocks today are cast in similar die casting machines.

The deck is open because a steel die must be retracted out of the

top of the casting as it cools. The die casting can be highly

automated to eliminate the skilled foundry workers needed to prepare

sand cores. In 1961 Chysler was using fairly advanced technology.

The alloy Buick 215 was sand cast, and probably remained so

through its long production life at Rover. Die casting machines

continually use the same water cooled permenant steel dies over

and over - like squeezing out toothpaste, or I like the think of the

old Play-Doh machines. Also, since alloy is a softer metal the

machine tooling can run at a faster rate so that fewer milling

stations might be necessary.

For what its worth...

The new Ford 5.0 has 3.63" bore on 100 MM bore spacing. I think the

slant six is 101 MM. If this casting technology were available years

ago the slant six could have been 256 cubic inches using the stock

4.125" stroke of the 225. Some big inch slant sixes have been built

by using carefully selected blocks and stroker cranks. With the

3.63" stroke and 4.50" stroke a slant six could have been 280 cubic

inches. Someday the hobby might make that possible.

[Young Ed]

Putting these motors in an antique is very intriging. I have some idea's and a 1939 Chryslar sitting idle. It looks like I must fire up the star ship to boldly go where no man has gone before:) You knoiw this is going to be great.

Rodney did you end up buying that 39 Chrysler? Or find another one?? We want to know details! If you got the /6 way there's some kinda hi-po cam laying about the garage that could end up headed your way. Dad and I took it out of his 63 valiant.

[Tim Keith]

The "Buster" thread on the slant six site is good to learn about

an alloy block that had corrosion problems, which became a

bench mark for reducing the motor weight as much as possible.

The ultra light motor failed because of oiling, which I think will

be overcome on the next one.

http://www.slantsix.org/forum/viewtopic.php?t=29183&highlight=buster

[jd52cranbrook]

A fellow inliner built this car for his wife to take to the drags. I forget the times she was getting out of it.