305 Block Casting #

kart31rac · 1/11/11, 2:46 PM

Looking at putting a 305 chevy together I have many different Blocks. I was wondering what was the best Casting # to use to build a 305 with. Just looking for some input.

thanks

jkinder88 · 1/30/11, 1:07 PM

I have been told (can't promise it's true) that the 776, 777, & 778 (last 3 casting numbers) blocks are thicker than others due to them being a Canadian block???? Like I said, don't take this as a proven fact, just what I was told when we built ours. We have also ran the 909 block with no problems, but it wasn't on Knoxville's list so we changed.

kart31rac · 1/31/11, 1:29 PM

I got one other Question, what are guys doing on the mains are they leaving them as a 2 bolt or having them machined for splaed 4 bolt. Just trying to get a block ready to put together.

thanks

jkinder88 · 2/1/11, 7:23 PM

Depends on what kind of motor you are building. We do splayed caps just for a little more strength.

1/11/11, 2:46 PM	#1 305 Block Casting #
kart31rac Senior Member Join Date: Jun 2010 Posts: 323	Looking at putting a 305 chevy together I have many different Blocks. I was wondering what was the best Casting # to use to build a 305 with. Just looking for some input. thanks

1/30/11, 1:07 PM	#2 Re: 305 Block Casting #
jkinder88 Member Join Date: Oct 2010 Posts: 33	I have been told (can't promise it's true) that the 776, 777, & 778 (last 3 casting numbers) blocks are thicker than others due to them being a Canadian block???? Like I said, don't take this as a proven fact, just what I was told when we built ours. We have also ran the 909 block with no problems, but it wasn't on Knoxville's list so we changed.

1/31/11, 1:29 PM	#3 Re: 305 Block Casting #
kart31rac Senior Member Join Date: Jun 2010 Posts: 323	I got one other Question, what are guys doing on the mains are they leaving them as a 2 bolt or having them machined for splaed 4 bolt. Just trying to get a block ready to put together. thanks

2/1/11, 7:23 PM	#4 Re: 305 Block Casting #
jkinder88 Member Join Date: Oct 2010 Posts: 33	Depends on what kind of motor you are building. We do splayed caps just for a little more strength.