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Old 12-09-2004, 04:52 PM
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350 4 bolt motor

I'm looking for a 350 4 bolt motor for my 53 chevy pick-up..Is all 350 4 bolt motors the same or what year of motor should i be looking for.Is there a difference between a 350 4 bolt out of a surburban and a car??Also ...How much difference is there between a th350 trans and a th400 trans...I'm running a 10 bolt posi with 3.08 gearing in the rearend.

Thx in Advance
Greywulf

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Old 12-09-2004, 05:10 PM
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4 bolt main 350 blocks were available for a number of years, mostly in pickups, Suburbans etc.

A turbo 400 is quite a bit heavier and longer than a turbo 350. Also stronger, but it's debatable whether you always need the extra strength. It also takes more horsepower to turn it.
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Old 12-09-2004, 05:46 PM
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Thx poncho62.....I have a chance at a 78 Surburban 350 4 bolt...it has a transmission...not sure if it is a th350 or th400 tho.
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Old 12-09-2004, 09:45 PM
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Greywulf, I probably dont live too far from you. I have a couple 350 engines sitting here, with trannys too that you would be interested in. One is still in the truck and can be driven and tested. Lemme know soon or it will be all parted out.


signed....SBC fanatic Keith
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Old 12-10-2004, 04:16 AM
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Where you at Ktaves?

I may be looking for a rebuildable 350 in the near future. Don't care if it's 2 or 4 bolt. Us old guys aren't as hard on engines as we used to be................lol
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Old 12-10-2004, 05:06 PM
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Where you from Ktaves?...I will give you a call


Greywulf
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Old 12-10-2004, 05:18 PM
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Grey.. just curious, why do you want a 4 bolt ?
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Old 12-10-2004, 06:37 PM
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Just a stronger motor Stepside454
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Old 12-10-2004, 07:29 PM
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I was always told, that unless you are going to top 500 horse, there was no real benefit, other than braggin rights, by having a 4-bolt block.

With that said, I'm probably as hung up on the 4-bolt fetish as anyone else. There's 3 or 4 lying around my shop right now.

I've seen several IMCA Mods running 2-bolt 350's, usually with good luck. Thas about as hard as anyone's gonna flog a motor repeatedly.

A few spun main bearings, yes, but I can't say I've ever seen a small block come out through the mains. Can't say the same about knotted up rods, though.
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Old 12-10-2004, 08:40 PM
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Ive seen so many people pay premium for a 4 bolt block, heck people have given me more than they should for 4 bolts..unless your buildin something REALLY stout...or...pulling heavy loads with it.. I wouldnt bother.
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Old 12-10-2004, 10:32 PM
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If theres no reason to build a 4 bolt unless your going over 500 hp then why did GM build it in the first place?
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Old 12-10-2004, 11:08 PM
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for towing purposes a 4 bolt is nice to have when the bottom end is being lugged.
For performance purposes, late 60s & early 70s, some of these motors (LT-1) for example ran over 6000 RPMS out of the box, not counting what people did to them, so they wanted em to stay together. later years it was more marketing than anything, enthusiasts knew the early 70s Vettes & Camaros had 4 bolt mains, so they must be better, so everyone wanted them.
Your best bet is a 2 bolt block, & adding aftermarket splayed 4 bolt caps...but its not a cheap deal.
Ive never broke a 2 bolt block, & Ive run some pretty hard.
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Old 12-12-2004, 01:09 AM
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Greywulf I tryed to send you a reply from your private message to me but it wouldnt go thru. Give me a call at 519 284 3863 I live about 45 min from you. I am in St Marys.

Keith
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Old 06-24-2010, 01:57 PM
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old cheavy motors...

Depending on what you want the motor for... there are differnt generations of 350's. The best ones in my opinion are the first generation of 350's (up to early 70's) the only thing that matters with where the motor comes from is the linkage to the transmision. there are two differnt 350 styles: short block (two bolt mains), and long block (4 bolt mains). if you have a small vehicle go with the short block. In the end i would suggest going and talking to mechanics in person. walk into your local auto parts store and pick the brains of the smartest person there. I myself am no pro mechanic like many others here on the web...
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Old 06-24-2010, 02:32 PM
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First time I have ever seen "shortblock" and "longblock" described that way.............
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