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Old 01-13-2005, 05:34 PM
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what's the difference???

What is the difference btw a 4 bolt and a 2 bolt engine (i'm thinking the way it mounts to the frame)???

Also, what is the difference btw a short block and a long block???

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Old 01-13-2005, 06:09 PM
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r u serious?
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Old 01-13-2005, 06:16 PM
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Shortblock = Cylinderblock, crankshaft, rods, pistons etc.

Longblock = Shortblock + Cylinder heads


2bolt and 4bolt refers to the number of bolts on the mains of the crankshaft
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Old 01-13-2005, 06:38 PM
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block differences

oldschoolrods has answered most of your questions.

There is no difference in mounting it to the frame or tranny. All small blocks are the same on the outside. The 400 has extra fins between the cylinders inside the water jacket for strength.

4 bolt vs 2 bolt. The four bolt has two extra bolts holding the crank in on the center three caps. The idea is for the crank to be able to handle higher torque. There are differences of opinion here. Some say the extra holes in the webs weaken the block.

Answer to what you didn't ask. The big blocks are also very similar. The front mounts are in the same place and the bell housing bolts are in the same place. Fom the crank to the deck is about 2 in taller.

Last edited by bracketeer; 01-13-2005 at 07:00 PM.
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Old 01-13-2005, 06:47 PM
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No need to give him a hard time for asking questions such as these. This is the hotrodding basics forum.

The question about 2 bolt vs. 4 was answered pretty clearly.

Shortblocks like said are mainly the block, crankshaft, rods, pistons (basically the rotating assembly).

Long blocks most of the time come with heads, cam, waterpump, sometimes an intake.

Turnkey engines are just drop in and go. Everything you need to fire it right up.
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Old 01-14-2005, 08:47 AM
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Also, some shops will sell what they call a "short block plus" -- includes cam and cam drive chain.

The deeper you go into an engine, generally, the tolerances are more critical, the tools and knowledge more specialized. There are a lot of us that are OK working on the top end of the engine that would prefer not to work inside the short block.
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