1 more 31 Desoto with 230 Flathead 6 with F head conversion forced induction.
Very expensive and extreme.
You can take a 230 or 265 mild build with multi carbs, cammed headers and yield 150 to 175 easily.
They will be very streetable and perform well.
This is a Slant 6 group so not adding any more as its now veering right off the rails.
Enjoy,
https://youtu.be/8GwiWNYdDLU

What I'm talking about is why try to make a flathead something it's not? Enjoy it for what it's best at being, not for what you managed to force it into being for a short time. Does it really matter if it makes 175HP or 140HP in a 1950's truck?

Listen you posted based on your opinions on Lhead 6s.
Ive presented you with 4 examples of modified Chyrsler Flathead 6s 2x265 and 2 x230.
50s truck or even 40s truck becomes a whole lot user friendly with A) more horsepower/ torque B) gear selection for more useful driving. On the 40s and 50s pickup trucks add in front disc brake kits and dual.MC for good measure.
The 1950s C series and D series trucks cams stock with V8s and Hemis since 1955.
Most guys do this if they do not want stock, shave head modestly to increase compression, higher lift cams (nothing radical), dual or triple carbs (this actually is far more efficient than a single or 1 2bbl carb as the multi carbs distribute fuel into 3 siamesed intake ports, split exhaust or headers helps this asthmatic engine exhale.
Some will add an overdrive trans like tge Borg and Warner R10 or a T5 ir an A833 overdrive. Others swap to Cheroker diffs with 3.73 gearing.
Myself my engine is a 228 long block dual carbs and exhaust, 4 spd and 3.23 gears. But my engine is old and worn, slight blowby and cyl leakage as indicated by a cyl leakdown test.
The reason for my thread was to toss around the idea of going slant 6, and yes it works well as others have done it successfully. But think I will stick with my 265 torque build, as there is no replacement for displacement.
My cam should allow me up to 5000 RPM...

I vote for the flatty in this build.

_________________
“Buy the ticket, take the ride.”
― Hunter S. Thompson

Thank you

George Asche in Venus PA is the person I was referring to with the 218 in his '51. George had a health crisis last year, I hope he's doing well.

If the vehicle can accept the 25 inch motor, that's a good L-head option. The big six with overdrive is better for sustained cruising at freeway speeds. They are fundamentally well engineered for the era, a reason that Chrysler did so well with blue collar car buyers for so many decades. They were used in agriculture equipment too. They are smooth torquey motors and last forever if you don't push them too hard.

A 230 with 150 hp in a light coupe is okay. Keep it light and have fun. My '47 1/2 ton Dodge has a 230, its geared for 50 mph and that's okay. A D150 with a 225 isn't a ball of fire either, but that's okay too. It does the job it was built for.

I've had many people tell me the same thing about my Slants......

Another vote for the flathead, just because it's different.

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Official Cookie and Mater Tormentor.

Yep, it sounds like you are really a fan of the flathead, and it definitely is different (as is the Slant).

Some perspective:
When I started seriously working on Slant 6 engines in 1988, a Model A Ford was ~60 year old technology and my 68 Dart was ~20 year old technology. Not many Model A's around in 1988, and in essentially no way could they compete with my 68 Dart and its Slant 6 (unless heavily modified), but they were cool to see and people had fun with them. Now, 1960s Mopars are ~60 year old technology. You can make them fast or get better MPG and you can enjoy them, but they will not compete with new technology. You can often surprise people with how well the old cars can do relative to newer stuff, but ultimately it is not about direct competition. To me, a big plus is the simplicity of older cars, which really let's you change things, diagnose problems, and make far away "field repairs" by the seat of your pants. I embrace the simplicity and remember that NO ONE (or very few people) had AC or navigation or cupholders or NVH stuff or power anything just a few decades ago.

My feeling is that you should do what you think is cool and what will let you be creative...

Lou

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Home of Slant6-powered fun machines since 1988

https://youtu.be/Sc0Rv9ynhpQ

Here is my 55 Fargo. I have entertained the idea of a hopped up slant 6 and A833 trans.
Thats my reason for the thread. I love the flatheads but also am fond of Slant 6s too.

Tim an FYI George is doing well, slowed down some but has a number transmissions as of late and engine builds too.
Tim Kingsbury and I are good friends so know exactly whats going down in Venus Pa.
On the 25 inch engines, here in the Great North all are 25 inch, aint no littlins up here ever.
The swap upwards is really not difficult.
Georges engine is a 230 not a 217 I believe.

Thanx Lou enjoyed your post.
Here's 1 Slant 6 that can handle modern engineering.
Enjoy,
https://youtu.be/lO0nP-3n6P4

That Fargo is one sweet truck!

_________________
“Buy the ticket, take the ride.”
― Hunter S. Thompson

I have both and like both equally. '59 Dodge Coronet 4dr sedan thats getting a Plymouth OD transmission. Only Plymouth offered an OD trans for the '57-'59 Mopar 230 Flatheads

The only flathead mopar I had experience with was an old '50 Cranbrook dad bought for $50.00 and drove to work for years. I drove it around the farm a little before I was old enough for a license. In the coldest weather that thing would always start when others needed a jump.

_________________
“Buy the ticket, take the ride.”
― Hunter S. Thompson