Year differences in the 300
Lead Driver
Joined: Dec 2000
Posts: 6,293
Likes: 47
From: South central, Minnesota
I love grany low in stop and go traffic! It makes the guy next to you(or in front of you ) in the prius crap his pants, when you give it a little too much of the old go pedal and the truck launches forward
!!
Elder User
Joined: Sep 2010
Posts: 721
Likes: 1
From: Monmouth County, NJ
Priused drivers never shut up about how little fuel their car uses (notwithstanding the fact it's about as practical as a moped). Therefore, I like to do them a favor by broadsiding their cars so they stop using fuel altogether.
On the subject of transmissions, though, make sure you pay attention to the R/A ratio too. I feel like a lot of guys get all tied up in engine/trans and forget this critical detail. (Yes, I learned this the hard way too- STAY AWAY FROM CODE 12!!!)
So make sure you (OP) check that door sticker when you go to look at anything. You might be like me 3 years ago and assume every truck has a reasonable ratio, but there are some really wierd ones lurking out there!
On the subject of transmissions, though, make sure you pay attention to the R/A ratio too. I feel like a lot of guys get all tied up in engine/trans and forget this critical detail. (Yes, I learned this the hard way too- STAY AWAY FROM CODE 12!!!)
So make sure you (OP) check that door sticker when you go to look at anything. You might be like me 3 years ago and assume every truck has a reasonable ratio, but there are some really wierd ones lurking out there!
Lead Driver
Joined: Dec 2000
Posts: 6,293
Likes: 47
From: South central, Minnesota
Not a whole lot. the 65-66 blocks have a smaller thrust bearing.
67-86 pretty much the same blocks.
The only things that changed on the 300 heads from 65-86 was the rocker arm designs and air injection. If I remember correctly there are 3 different heads when it comes to rocker arm design. One without built in push rod guide slots in the head ( rail type rocker arms ) , one with guide slots in the heads ( standard rocker arms ) and then the later heads pedestal type bolt in rocker arms. Then there are heads with air injection ports and those without. All carbed 300 head will have combustion chambers right around 76cc.
The 87+ ( EFI ) blocks don't have the opening for the mechanical fuel pump.
The 87+ EFI head have the pedestal mount rockers arms and a smaller fast burn combustion chambers. And they have more mounting holes for the manifolds.
I might have missed some thing that is a basic description of the changes.
Senior User
Joined: Oct 2010
Posts: 164
Likes: 0
My '84 work truck has 1/2 rh lugs on the front and the 9/16 or 5/8 can't remember which on the rear with one side left hand threads , depending on which side the drum was installed after a brake job .
I think the front rotors have been replaced to the smaller rh lugs .
I had another diesel '84 with all four right hand large lugs but the motor went south so I finally replace the one left hand drum on the work truck , Thank God , it really annoyed me , he he .
Tuned
Joined: Feb 2004
Posts: 339
Likes: 3
From: Saudia Arabia
Great info, just want to know about the intake manifolds on the 300's, do they have the same studs space throughout the years, because late carb will not fit right on, that's what I had once when I tried to put 84 Carter YFA carb on my 66 Ford 300.
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Lead Driver
Joined: Dec 2000
Posts: 6,293
Likes: 47
From: South central, Minnesota
I do know there were some with different carbs. I've stumbled across some older vans that had some little carb on them. It might have been an Autolite 1100/1101. But I'm not sure, that was over 10 years ago. I'm not sure if the stud spacing was different either.
Lead Driver
Joined: Dec 2000
Posts: 6,293
Likes: 47
From: South central, Minnesota
You can run a 2V on the stock intake with a 1V to 2V carb adapter. But the gains from doing this are fairly low.
If you go with an aftermarket intake like the Offenhauser C-series you can run a 2V carb with a 4V to 2V carb adapter. You'll get a good performance increase.
The gas mileage depends on how you drive. If you have a heavy go pedal foot then yes the mileage will drop.
If you go with an aftermarket intake like the Offenhauser C-series you can run a 2V carb with a 4V to 2V carb adapter. You'll get a good performance increase.
The gas mileage depends on how you drive. If you have a heavy go pedal foot then yes the mileage will drop.
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