305 blocks- whats the best one to use ?

JRyan · 08-19-2007, 03:30 PM

Kenny,

Better not use a 4-bolt 350 block as a core to sleeve, as they aren't a legal replacement for a 305 (based on a call to NHRA). The 305's were all 2-bolt and that's what NHRA wants to see IF the pan ever comes off. The best block to use if you can find one is the '68, '69 307 block. Many were cored as 350's so you end up with the very thick walls of a 350 but can use a more generally available sleeve.

Jerry

Jim Cassels · 08-19-2007, 08:59 PM

Kenny,
Jerry is giving you the correct info, they will not accept the 4 bolt block, I learned the hard way. Some run them but they are not legal.

Don quinn · 08-19-2007, 09:21 PM

The 80 corvette had a 305 4 bolt block

Kenny Wigington · 08-19-2007, 10:50 PM

Thanks guys. I do appreciate the info.

Just for the sake of asking, how much extra would a block weigh , with all sleeved ? Is it lighter than that Bowtie block, Dick and Reggie mentioned ?

Jim Cassels · 08-20-2007, 09:25 PM

Don,

STK4340 · 08-21-2007, 01:26 PM

I think the "201"? truck blocks are the stock 305 blocks of choice. Seems I remember the Shermans using them when they ran that combo a few years ago. Cliff said they were stronger.

08-19-2007, 03:30 PM	#1
JRyan Senior Member Join Date: Apr 2003 Location: Aberdeen SD Posts: 645 Likes: 30 Liked 112 Times in 31 Posts	Re: 305 blocks- whats the best one to use ? Kenny, Better not use a 4-bolt 350 block as a core to sleeve, as they aren't a legal replacement for a 305 (based on a call to NHRA). The 305's were all 2-bolt and that's what NHRA wants to see IF the pan ever comes off. The best block to use if you can find one is the '68, '69 307 block. Many were cored as 350's so you end up with the very thick walls of a 350 but can use a more generally available sleeve. Jerry

08-19-2007, 08:59 PM	#2
Jim Cassels Junior Member Join Date: Nov 2002 Location: Cairo, Ga. Posts: 90 Likes: 2 Liked 0 Times in 0 Posts	Re: 305 blocks- whats the best one to use ? Kenny, Jerry is giving you the correct info, they will not accept the 4 bolt block, I learned the hard way. Some run them but they are not legal.

08-19-2007, 09:21 PM	#3
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 ? The 80 corvette had a 305 4 bolt block

08-19-2007, 10:50 PM	#4
Kenny Wigington Senior Member Join Date: Sep 2004 Location: Cumming,Ga. USA Posts: 967 Likes: 36 Liked 60 Times in 12 Posts	Re: 305 blocks- whats the best one to use ? Thanks guys. I do appreciate the info. Just for the sake of asking, how much extra would a block weigh , with all sleeved ? Is it lighter than that Bowtie block, Dick and Reggie mentioned ? __________________ 2894 STK Last edited by Kenny Wigington; 08-19-2007 at 10:52 PM.

08-20-2007, 09:25 PM	#5
Jim Cassels Junior Member Join Date: Nov 2002 Location: Cairo, Ga. Posts: 90 Likes: 2 Liked 0 Times in 0 Posts	Re: 305 blocks- whats the best one to use ? Don,

08-21-2007, 01:26 PM	#6
STK4340 Junior Member Join Date: Oct 2004 Location: Vacherie, LA Posts: 63 Likes: 0 Liked 0 Times in 0 Posts	Re: 305 blocks- whats the best one to use ? I think the "201"? truck blocks are the stock 305 blocks of choice. Seems I remember the Shermans using them when they ran that combo a few years ago. Cliff said they were stronger.