[Overdriv]

A fellow I work with told me he has a tall deck BBC that has 4-bolt mains including the front and the rear mains. I have only been involved with one tall deck BBC and cannot remember if all it's mains were 4-bolt or not.

I told him someone might have had 4-bolt mains installed in the front and rear positions, that I thought they did not come from factory like that. He says all tall deck BBC blocks have all 4-bolt mains including the front and rear main. I think not but I'm not sure now.

What say you folks?

[66GMC]

Well, I'm no BBC expert ... but what I think I recall reading somewhere is that "Tall Block" engines were only used in MD/HD trucks (ie larger than a 1-ton) I'm pretty sure that the only "tall blocks" are 427 truck and perhaps 366?

I could believe that these engines were all 4-bolt main because of the HD factor.

Someone with more experience and knowledge may chime in here and prove me wrong.

[Bumpstick]

First off yes all of the 4 bolt main BBC`s have 4 bolt main caps on all main journals from front to back...

Also there are 454 tall deck blocks which are Bowtie and are Gen V but with the Gen IV blocks they are either 427 or 366 (no 454`s that I know of...?) The Gen V Bowtie blocks are which are either short or tall deck were intended for racing apps, while the Gen IV 427`s and 366`s were intended just for heavy duty truck apps but of course found their way into racing as well...