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Author Topic:   350 2 bolt vs 4 bolt
sledgehammer
Member
posted May 19, 2004 05:56 PM
Would anybody be scared of using a 2 bolt block for a 383? What are the considerations when thinking about using a 2 bolt instead of a 4 bolt.

Thanks

joetaylor
Member
posted May 19, 2004 06:42 PM
only have one thing to say ....studs........if you stud the main bearings it will hold as much as a 4 bolt as ling as you wse a good crank

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loose is fast & on the edge of out of control


Okie11m
Member
posted May 19, 2004 06:51 PM
A buddy of mine runs a 2 bolt. He told me one time "2 bolt blocks are stonger than 4 bolts 'cause the 4 bolts have 6 more holes drilled in them!!" I got a good kick out of that example.


racerguy500
Member
posted May 19, 2004 10:04 PM
We have 3 of them running right now, 2 years after they were built. Never even look for 4 bolts, just use good stuff and you are good to go.


racing33A
Member
posted May 20, 2004 02:58 PM
I have used 2 bolt blocks quite a few times and I have never had one let go, ever. I have had only one four bolt let go, that was due to severe over revving. I guess what I am saying is I would not hesitate to use a 2 bolt for my engines. Keep in mind these are "claimer" motors also.
racing33A


sixwillwin
Member
posted May 20, 2004 10:01 PM
2 bolts with studs!!


crc1124
Member
posted May 31, 2004 10:11 PM
It seems to me the only engine failures we've had with a sbc was caused by rod failure at the big end. I haven't heard of a main cap failure, but I've only been in dirt track racing for about 5 years. I helped a guy for most of that time.


jay116
Member
posted June 01, 2004 03:02 AM
just think of the last time you heard of a main cap failure in a SBC. Rods and pistons leave the block and dont hurt the main caps.
Only time you need four bolt is if you are not naturally aspirated. At least thats what I have always read.

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Jason Boivin
http://www.rcracing-team.com


racerwilson
Member
posted June 01, 2004 04:39 PM
we was freshining up my 2 bolt block and found the #4 main cap was broke! Dont know how long it had been like this as the last race I ran it in I never had any problems oil pressure wise and was turning the motor 7800 rpms for 30 green flag laps.


ss99
Member
posted June 02, 2004 07:06 PM
We broke a main cap on our 4-bolt block and knew it immediately due to the loud knock in the motor. Oil pressure was fine and the bearing did not spin, but the knocking was a dead giveaway.

ss99

Dixon
Member
posted June 03, 2004 01:08 PM
Ron Shaver (he builds some B.A. sprint motors) uses 2 bolt mains with studs


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