trying to id my engine.

[Fordum]

This has got to be the shortest reply from you ever.

Had to go to the bathroom, didn't have time to make a long post.

You know, I was kidding with the water, but why couldn't he pour oil in one cylinder and then measure it when you let the piston displace it out?

There would be a small amount of leakage past the rings and other places, but there should be enough difference between 1/8 of 305 ci and 350 ci to be able to tell which he has.

Shouldn't hurt anything, the engine would smoke a little afterward, but that would be all.

 

[topless jackass]

An original 305 balancer will be slightly smaller in diameter, thicker and have a flat spot milled into it to balance it...I don't really know how to describe it, but they definitely are different than a 350 balancer.

 

[bradshawtech]

Scott to the rescue........... Please.

 

[Fordum]

OK, just of giggles and snorts, I ran the math.

A 305 engine cylinder would displace 21.12 ounces of fluid.
A 350 engine cylinder would displace 24.22 ounces of fluid.

Slightly less than half a Coke bottle full difference.
Not a lot, but you should be able to tell which is which.

 

[4xcrazy]

An original 305 balancer will be slightly smaller in diameter, thicker and have a flat spot milled into it to balance it...I don't really know how to describe it, but they definitely are different than a 350 balancer.

which i find odd, cause i could have swore they shared the same crank & rods, thought the only difference was the piston/bore size.

 

[4X4HIGH]

The weight of a 305 and 350 crank is 50 grams different and a 305 balancer is the smaller diameter but is wider than a 350 balancer. The balancer can't be used to judge which engine it is as you can swap balancers all day long between ALL SBC other than the 400 SBC of course which we all know is externally balanced.

Forgot to add that ALL 305 engines i've ever seen used a timing tab BEHIND the water pump at about the 12 o'clock position.

 

[bradshawtech]

Thank You. Discussion closed.......

 

[4xcrazy]

Thank You. Discussion closed.......

 

[xXamwxxXx]

well all in all the engine runs good so i'm fine with it.

 

[Fred_M1010]

Forgot to add that ALL 305 engines i've ever seen used a timing tab BEHIND the water pump at about the 12 o'clock position.

Are you sure about this?
I helped a friend adjusting his timing some days ago, and he had the timing tab as you describe it, and I'm pretty sure he has a 350.

well all in all the engine runs good so i'm fine with it.

Yeah, that's the most important thing after all

But didn't you find the casting number on the block?
They can be hard to see since it's pretty tight between the cylinder head and the fire wall, so you might need a flash-light and a mirror.
Here a better picture of it's location (behind the driverside cylinder head)
If you have a good digital camera, maybe you could squeeze the camera in there to take a pic, and examine the picture afterwards.

 

[dirtygoat]

Nice...010 block...

I remember when all of those were 4 bolt mains...

Way before the interwebs and stuff...