305 blocks- whats the best one to use ?

John Leichtamer Jr · 08-25-2007, 05:04 PM

Mortec shows 2 different castings # for 305 4bolt blocks. They say there for hd trucks of course there Canadian.

John

Tim H · 08-25-2007, 06:34 PM

Thats really suprising , I live in Canada and have never heard of a production 4 bolt main 305 block .
I am going to investigate this a little further, just for my own interest. I remember a few folks claiming their mid '80s Monte Carlo SS were 4 bolt but when they tore them down they were always 2 bolt main.

I guess you have to wonder why a HD truck would be 305 equipped in the first place ?

John Leichtamer Jr · 08-25-2007, 11:08 PM

Casting # 361979 460778

John

Paul Sarvas · 08-26-2007, 06:29 AM

Quote:

Originally Posted by John Leichtamer Jr

Casting # 361979 460778

John

http://www.mortec.com/castnum.htm

Tim H · 08-26-2007, 11:13 AM

Really dont think they exist ... has anyone ever seen one ??? Small block interchange manual SA Design #SA 55 shows #361979 as 305 78-79 2 bolt main and #460778 as the same . (pg7). It states "these5.0 liter Gen. 1 motors are all medium journal 2.45" blocks and production blocks were only made with two-bolt main bearing caps". (pg 13 ).

Tand E racing · 08-26-2007, 05:46 PM

Yes i use to have one, they were mainly used for marine use.

Don quinn · 08-26-2007, 08:09 PM

I checked my core supply i have a 305 block #460778 and it is a 4 bolt main. I also have 350 010 blocks that are 4 bolt and 2 bolt.

08-25-2007, 05:04 PM	#1
John Leichtamer Jr Senior Member Join Date: Sep 2006 Location: Orange City Fl Posts: 764 Likes: 0 Liked 0 Times in 0 Posts	Re: 305 blocks- whats the best one to use ? Mortec shows 2 different castings # for 305 4bolt blocks. They say there for hd trucks of course there Canadian. John

08-25-2007, 06:34 PM	#2
Tim H VIP Member Join Date: Jan 2007 Posts: 1,043 Likes: 1,077 Liked 482 Times in 159 Posts	Re: 305 blocks- whats the best one to use ? Thats really suprising , I live in Canada and have never heard of a production 4 bolt main 305 block . I am going to investigate this a little further, just for my own interest. I remember a few folks claiming their mid '80s Monte Carlo SS were 4 bolt but when they tore them down they were always 2 bolt main. I guess you have to wonder why a HD truck would be 305 equipped in the first place ?

08-26-2007, 11:13 AM	#5
Tim H VIP Member Join Date: Jan 2007 Posts: 1,043 Likes: 1,077 Liked 482 Times in 159 Posts	Re: 305 blocks- whats the best one to use ? Really dont think they exist ... has anyone ever seen one ??? Small block interchange manual SA Design #SA 55 shows #361979 as 305 78-79 2 bolt main and #460778 as the same . (pg7). It states "these5.0 liter Gen. 1 motors are all medium journal 2.45" blocks and production blocks were only made with two-bolt main bearing caps". (pg 13 ).

08-26-2007, 05:46 PM	#6
Tand E racing Junior Member Join Date: Feb 2005 Posts: 94 Likes: 0 Liked 0 Times in 0 Posts	Re: 305 blocks- whats the best one to use ? Yes i use to have one, they were mainly used for marine use.

08-26-2007, 08:09 PM	#7
Don quinn Junior Member Join Date: Dec 2002 Posts: 2 Likes: 0 Liked 0 Times in 0 Posts	Re: 305 blocks- whats the best one to use ? I checked my core supply i have a 305 block #460778 and it is a 4 bolt main. I also have 350 010 blocks that are 4 bolt and 2 bolt.

08-25-2007, 11:08 PM	#3
John Leichtamer Jr Senior Member Join Date: Sep 2006 Location: Orange City Fl Posts: 764 Likes: 0 Liked 0 Times in 0 Posts	Re: 305 blocks- whats the best one to use ? Casting # 361979 460778 John