Notices
1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

flathead gas

Thread Tools
 
Search this Thread
 
Old May 28, 2003 | 07:32 AM
  #1  
ddurant's Avatar
ddurant
Thread Starter
|
Senior User
Joined: Mar 2003
Posts: 197
Likes: 0
From: Richmond VA
flathead gas

do you guys use a gas additive for the unleaded gas. i have a 49 flathead.
 
Reply
Old May 28, 2003 | 08:28 AM
  #2  
286merc's Avatar
286merc
Posting Guru
20 Year Member
Joined: Jul 2001
Posts: 2,119
Likes: 2
From: Southern New Hampshire
flathead gas

Flats thru late 50 have hardened valve seats, they run fine on todays crap. All flats have stainless exhaust valves also.
 
Reply
Old May 28, 2003 | 08:35 AM
  #3  
ddurant's Avatar
ddurant
Thread Starter
|
Senior User
Joined: Mar 2003
Posts: 197
Likes: 0
From: Richmond VA
flathead gas

thanks Carl

i didn't know they had hardened seats that far back. should i use 93 oct. or 87
 
Reply
Old May 28, 2003 | 09:05 AM
  #4  
286merc's Avatar
286merc
Posting Guru
20 Year Member
Joined: Jul 2001
Posts: 2,119
Likes: 2
From: Southern New Hampshire
flathead gas

Ford had hardened seats in the 40's Dale, maybe even earlier.
As long as the compression hasnt changed much due to head milling, bore or carbon, then 87 octane is fine. Set the timing and give it a run, flattys do not like retarted or advanced ignitions, both cause hot running.
 
Reply
Old May 28, 2003 | 09:07 AM
  #5  
ddurant's Avatar
ddurant
Thread Starter
|
Senior User
Joined: Mar 2003
Posts: 197
Likes: 0
From: Richmond VA
flathead gas

great info
 
Reply
Old May 29, 2003 | 05:40 PM
  #6  
j gibbs's Avatar
j gibbs
Senior User
Joined: Mar 2003
Posts: 274
Likes: 0
From: SW Wyoming
flathead gas

That's great info!

I have a '50 with the flathead 6 we rebuilt about 10 years ago. I haven't driven it for 7 years except on and off a trailer once. When I drove it in High School I could still by regular (that's regular with lead not regular unleaded). I have been a little worried that I should be buying additive or get hardened seats for it. Now I just need to fix the brakes and about 10 other and get it registered to be back on the road.
 
Reply




All times are GMT -5. The time now is 04:06 PM.

story-0
Top 10 Fords at 2026 Carlisle Ford Nationals

Slideshow: Top 10 Fords at 2026 Ford Nationals

By Joe Kucinski | 2026-06-09 11:10:08


VIEW MORE
story-1
3 Best / 3 Worst Parts of Modern Ford Ownership

Based on years of owning multiple modern Ford products.

By Brett Foote | 2026-06-09 10:53:36


VIEW MORE
story-2
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

SPONSORED: From muddy boots to rain-soaked cargo, these upgrades address some of the most common frustrations Ford truck owners face every day.

By Pouria Savadkouei | 2026-06-08 18:50:34


VIEW MORE
story-3
Every 2026 Ford Engine Explained

Here's everything you need to know about every Ford engine available for the 2026 model year.

By Brett Foote | 2026-06-05 12:58:01


VIEW MORE
story-4
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-5
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-6
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-7
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-8
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE
story-9
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE