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Old 07-02-2004, 04:56 PM
Nightfire's Avatar
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Need some question answered

When you look at people talking about SBC's and look at the engine ads in magazines, it reads "350 SBC, 4 bolt main".

What does the "4-bolt mean"? Is that the engine mount related?

Mike

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Old 07-02-2004, 05:35 PM
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4 bolt refers to the number of bolts on each crankshaft main cap. 4 bolt caps add strength to the bottom end of the motor so it can safely rev to a higher rpm than an equivalent 2 bolt main motor.

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Old 07-03-2004, 03:31 AM
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SBC 4 bolt main

Most people get by with the 2 bolt main engines just fine. For the few who want big HP from their 350sbc the 4 bolt main is the way to go.


Tazz


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Old 07-03-2004, 06:01 PM
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Thanks a lot, so for a first time rebuilder I woulnt necesarly need a 4 bolt main but it would be better right?

Mike
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Old 07-03-2004, 06:51 PM
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I don't think it would necessarily be better to have a 4 bolt main. Even though there are 4 bolts on each main cap, the caps that are used in the 2 bolt system are alot thicker than the 4 bolt one and some would argue they are better for a high torque motor.

Sorry I couldn't be more specific, but a good example is my friend's stroked small block. Based off a 2 bolt main 350 out of a chevy half ton pickup, the mechanic that internally balanced it said it would be good for 7500RPM without any problems.
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Old 07-03-2004, 09:50 PM
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There are about a gazillion and a half hottie 350 2-bolters out there that are doing fine. Build a 2-bolter and drive happy.
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Old 07-04-2004, 04:30 PM
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I have read a few articles that said if the motor is going to see less than 650 horses the 2 bolt would be fine. More than that and go 4 bolt. On the pic below it shows 4 bolt mains. These are not stock but a conversion kit to make a 2 bolt into a 4 bolt but it gives you the basic idea.



Kevin
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Old 07-04-2004, 04:52 PM
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Cool, thanks Kevin and everyone else.
I'm looking at a 1978 350 that was running when it was pulled. Carb to engine all complete. $300. We'll see what happens.
Again thanks everyone,

Mike
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