Where do you start?

When you talk about a block being 1/2 short or tall or .100 tall etc, what are you using for a starting point? Is it the stock Chrysler RB block dimension? B block dimension?

What about the Chevy guys? Do you start with the car block measurements and still call the truck block "tall"?

When talking cranks, something that has a 5/8 stroke for instance, started life as what?

Im only guessing but Id say that the stock 426 is where it starts and the Chevys are the short car blocks for starters? Correct?

 

Std deck referees to the factory dimension to the passenger car crankshaft center-line to the deck of the block (head gasket surface)

So yes a truck block is considered a tall deck in Chevy Land.

In Chrysler Land it is usually the RB / Hemi engine discussed unless you are building a B motor. The B 400 block with a 440 crank is a popular combination that is why the short deck Hemi combination is popular.

The stroke term also refers to the standard dimension but with so many different stokes available in our modern times in longer and shorter strokes for almost every engine size it is much more accurate to actually state the stroke in real numbers.
In other words saying it's a 5/8 stoker is in fact outdated and confusing terminology. Because it -" started life as what? "

 

Thanks.

My car is one of those with the 400 block/440 crank.

So if someone is selling or wanting a BAE block .100 tall that means its .1 taller than the RB?

I agree that using the actual stroke is the best way to get your point across.

 

Standard deck height of a Chrysler Hemi is 10.725" (10 3/4"). Stock Hemi stroke is 3.750" (3 3/4").

100 tall means a 10.825" deck height. It's measured from the crankshaft center line to the top of the deck.

5/8" stroker is stock stroke of 3.750" + .625" (5/8") = 4.375" (4 3/8").

.

 

Chevy standards are still 9.800 for standard deck (9.780" is still considered "Zero decked" by some, although that is going away rather quickly.) Tall deck is 10.200". But as soon as you get to either big motors or pro stock engines, it is all a raw measurement. And when you see a pro stock block cut to a total deck height that starts with an "8", then you really forget about "standard" or "tall deck" stuff.

 

measurements

That goes for the rods are referred to. Call them what they are. Center to center length. My rod boxes have c to c on the side. not + whatever Don

 

Old Chevy truck engines had three compression rings. The .400 tall block is how they made room for them.