sileightyboy

does anyone know how to tell the difference between a 302 and a 351, i'm looking at buying a car with a 351 in it and i want to make sure it is a 351.

skidmarx

http://www.fordcobraengines.com/351c%20Differences.htm

this page isnt REALY about the difference between 302 and 351, but if u have a read through, u will find there are little differences, and ur answer may just be at the bottom of the page

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gas 84k

There is no way to tell unless you pull the sump off to see what crank it has all clevo blocks are the same externerly.

sileightyboy

is there a way to tell via engine number?

gas 84k

You have to remember these engines are 25 plus years old so if they have the same crank in them is highly unlikely.

greenhj

A "mate of mine" lol

Anyway, he drops a real small sinker on some string down the plughole and measures the stroke. Not super accurate but you should see a 1/2" difference.

Just dont lose the sinker or its heads off and one unhappy owner...

PRO-GMH

Is it a cleveland or windsor?

If its a windsor then theyre taller than a 302.

If its a clevo you can do as greenhj said... but I wouldnt use a sinker because you could lose it in there. Use a straw or something that wont break or fall in there. Theres a difference in stroke between them with the extra cubes.

quarter pounder

Iv'e seen thin gauge wire inserted into spark plug hole at BDC to check rough length of stroke.

sileightyboy

engine is a clevo

BossHoggett

Inlet manifold width the absoute give away, Wider in the valley in Clevos.
Taller decks in the windsor motors.
and if you lift the breather cap and look into the rocker, the 302s in standard form had a round rocker falcrum ball and he clevo a rectangular.

Telling 302 windsors and 351 windsors apart , thats another matter. Lucky theyre not common unless you had a 60s American galaxy or fairlane and so on.

greenhj

Isnt a clevo block the same 302/351,

BossHoggett

ummmmmmm its been a while..... but yea i belive so......??? but feel free to correct me

greenhj

I wouldnt know mate, ive no need to slow down an aircraft carrier by lobbing one overboard so I dont pay much attention.

I thought a 51 windsor was an inch taller in the deck more than an 02

Clevo externally identical

Hovey

Yes, a 302 and a 351 cleveland are EXACTLY the same block, there is no way to tell externally (other than the measuring the stroke thing) but you'de have to ask some mates who have a 302, then a 351 if you can test their donks first then go check the motor you're looking at... Alternatively the engine number is a good place to look, thought it may not be an origional crack who would de-cube an engine with a smaller crank, that's a shooting offence where I come from.

Nifty trick below...

When you register your car with a 302 engine number you can stroke it to a 383 and constable plod cant tell from checking the engine externally... Like I have... Sweeeet!

36-427

pull the front left side plug out put the piston up to top dead centre take a long thin screwdriver mark it next to a point on the motor as a reference point rotate the crank BY HAND to bottom dead centre insert screwdriver gently to top of piston mark using the reference point withdraw and measure the stroke easy