Just purchased a 91 F150 with a 5.8 liter engine. Don't know much about trucks. Someone asked me what size engine I had? They mentioned 351. What does the 5.8 liter equal in size? Thanks for any help.

 

I cannot remember the formula correctly, but I THINK it is engine displacement/60.5 (thats the number I am unsure about). A 5.8 is a 351. a 5.0 is a 302. For some reason the Chevy 350 is not a 5.8. try to figure that one out.

 

Hey buddy, I got curious one day, so I looked up the equaiton for my engine size, converting 4.9L to inches, very interesting equation....

Your engine, registers a 353.9479, by my Britannica Encyclopedia.

My 4.9 equals 299.02495.

My buddy's 302 equals 4.9528L!

The equation goes as follows: If you would like to convert cubic inches, into liters, then multiply the amount of inches, by .0164

If you would like to convert liters into cubic inches, then multiply how ever many liters, by 61.0255

Hope this helps, you'll start to doubt Ford's engine measurements, when you check all engine sizes, some just don't match up!

2nd Lt. Christopher J. Salisbury
'82 F100 Flareside
300" T18 4speed

 

I guess that explains why a few years ago Ford finally started calling the "5.0L" Mustang GT a "4.9L".. they started rounding down instead of up. Now Mustang GTs have a 4.6 I think... isn't it the newer modular engine they use in the trucks as well, or is there still the 5.0L (4.9L) 302ci around? (I don't think there is..)

Chuck

 

I posted this info before the GM spies stole 2 days worth of our posts (ha ha)- but after proclaiming that a 302 was a 5.0, PERIOD (another deleted/lost/hijacked post)- I must admit that I was wrong. I wish the whole string was still here for us to follow the debate, but oh well.

A 302 has 301.5 CID, which translates into 4942.2 (ford's figures, not mine) cc displ. SO, it actually should be rounded down and called a 4.9 Liter. Also, the "351" is not a 351. It measures 5765.9 cc displ., so calling it a 5.8 is correct, but in SAE it measures 351.9 CID, which should be rounded up to 352.

So, we must ask ourselves "why?" I am guessing the answer is: to avoid confusion. calling the 302 a 4.9 would confuse it with the 300 I-6 (300.1 CID, 4917.5 cc FYI)-and it also makes it sound a little bigger. I am sure that this was the same reason the "351" is called a 351- to avoid confusing it with the 352 FE.

I am not sure, but I think Ford did a similar thing with the FT series of engines (i.e. 331, 361, 391) to avoid confusion with the 330, 360, 390 FE's

so, there you have it- my little slice of humble pie. I have still never heard of Ford "oficially" calling the 302 anything but a 5.0, but I won't argue with anyone who says they did (again).

Nate

1964 F-100 Custom Cab 292 V-8 3 spd
1964 F-100 292 V-8 3 spd
1990 F-150 5.8L- I guess I have to call it a 352 now :-)