Hardblock?

richie 2 · 06-05-2017, 08:00 PM

I have a set of S/S 350ci chevy pistons + .060''....should I hardblock fill my 010 block to support that large an oversize? wondering about the extra weight too...tks.

Tim H · 06-05-2017, 08:34 PM

Most replies are going to favor the hardblock procedure.

HP HUNTER · 06-05-2017, 09:12 PM

Quote:

Originally Posted by richie 2

I have a set of S/S 350ci chevy pistons + .060''....should I hardblock fill my 010 block to support that large an oversize? wondering about the extra weight too...tks.

Yes

Alan Roehrich · 06-05-2017, 09:17 PM

Absolutely. In fact, you should probably have it thoroughly sonic tested. The majority of those blocks are really marginal at that over size.

richie 2 · 06-05-2017, 11:15 PM

alan even if its thin, would the filler not still support it? so the thicker the better...fill the thickest one?

carl hinkson · 06-06-2017, 05:47 AM

Sonic test first and at that bore plate honing is a must to achieve good ring seal.

Personally i don't find many OEM blocks that would be a good build at .060 over. Like I said sonic test first.

James L Miller · 06-06-2017, 12:06 PM

Do you use a half fill or a full fill? Do you put a gasket and head on after filling that side of the block so the bores are distorted in the same way as when running? I was thinking of buying the full fill Hard-Blok and then using half in my 273 Mopar block (and 1/2 of that on each side). I've never used this before, but the cylinder walls on the 273 blocks are under .200" thick, some down around .130" with a standard bore. The cylinder walls tend to be thinner in the middle and the front and rear areas between the cylinders.

GTX JOHN · 06-06-2017, 04:22 PM

.130 at Std. Bore is rather thin.

Might be worth checking a few more blocks.

If that is on thrust side I personally would not like to us that block.

Suggest filling it to within a inch or 1 1/2 to top of water passage if
I did use it.

randy wilson · 06-07-2017, 10:13 AM

Do what you want, but I wouldn't hard block anything. Did a 0.060 over 283, and a 0.030 327, and if you could watch the shaking of the stones when rehoning after teardown, versus ones being honed without any hardblock, you'd know what I mean. They never, ever, stayed round. And everything was done with two torqueplates, mains, and pump installed. I have never used it since.

ss3011 · 06-07-2017, 11:04 AM

If you had the choice , wouldn't it be better to start with a good block , like a Bowtie or Dart ? A filled block has other problems like bores going out of round , or cooling problems when racing . What does a filled block weigh , compared to a Bowtie block . Plus after you where it out for bore size , it can be sold to someone that can use a bigger bore size . In the long run it might not really cost more to run a good block .

06-05-2017, 08:00 PM	#1
richie 2 Senior Member Join Date: Feb 2009 Posts: 967 Likes: 418 Liked 200 Times in 91 Posts	Hardblock? I have a set of S/S 350ci chevy pistons + .060''....should I hardblock fill my 010 block to support that large an oversize? wondering about the extra weight too...tks. Last edited by richie 2; 06-05-2017 at 08:17 PM.

06-05-2017, 08:34 PM	#2
Tim H VIP Member Join Date: Jan 2007 Posts: 1,040 Likes: 1,064 Liked 481 Times in 158 Posts	Re: Hardblock? Most replies are going to favor the hardblock procedure.

06-05-2017, 09:17 PM	#4
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,095 Likes: 1,542 Liked 1,772 Times in 402 Posts	Re: Hardblock? Absolutely. In fact, you should probably have it thoroughly sonic tested. The majority of those blocks are really marginal at that over size. __________________ Alan Roehrich 212A G/S

06-05-2017, 11:15 PM	#5
richie 2 Senior Member Join Date: Feb 2009 Posts: 967 Likes: 418 Liked 200 Times in 91 Posts	Re: Hardblock? alan even if its thin, would the filler not still support it? so the thicker the better...fill the thickest one? Last edited by richie 2; 06-05-2017 at 11:18 PM.

06-06-2017, 05:47 AM	#6
carl hinkson Member Join Date: Feb 2007 Location: NORTHEAST Posts: 287 Likes: 1 Liked 18 Times in 10 Posts	Re: Hardblock? Sonic test first and at that bore plate honing is a must to achieve good ring seal. Personally i don't find many OEM blocks that would be a good build at .060 over. Like I said sonic test first.

06-06-2017, 12:06 PM	#7
James L Miller Member Join Date: Apr 2005 Posts: 494 Likes: 6 Liked 25 Times in 16 Posts	Re: Hardblock? Do you use a half fill or a full fill? Do you put a gasket and head on after filling that side of the block so the bores are distorted in the same way as when running? I was thinking of buying the full fill Hard-Blok and then using half in my 273 Mopar block (and 1/2 of that on each side). I've never used this before, but the cylinder walls on the 273 blocks are under .200" thick, some down around .130" with a standard bore. The cylinder walls tend to be thinner in the middle and the front and rear areas between the cylinders. __________________ Mopar 2 Ya! Last edited by James L Miller; 06-06-2017 at 12:24 PM. Reason: More info added.

06-06-2017, 04:22 PM	#8
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,720 Likes: 2,770 Liked 2,436 Times in 688 Posts	Re: Hardblock? .130 at Std. Bore is rather thin. Might be worth checking a few more blocks. If that is on thrust side I personally would not like to us that block. Suggest filling it to within a inch or 1 1/2 to top of water passage if I did use it. __________________ John Irving 741 Stock 741 Super Stock

06-07-2017, 10:13 AM	#9
randy wilson Senior Member Join Date: Jan 2007 Location: N/A Posts: 882 Likes: 0 Liked 22 Times in 22 Posts	Re: Hardblock? Do what you want, but I wouldn't hard block anything. Did a 0.060 over 283, and a 0.030 327, and if you could watch the shaking of the stones when rehoning after teardown, versus ones being honed without any hardblock, you'd know what I mean. They never, ever, stayed round. And everything was done with two torqueplates, mains, and pump installed. I have never used it since. __________________ don,t have one

06-07-2017, 11:04 AM	#10
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 908 Likes: 70 Liked 238 Times in 113 Posts	Re: Hardblock? If you had the choice , wouldn't it be better to start with a good block , like a Bowtie or Dart ? A filled block has other problems like bores going out of round , or cooling problems when racing . What does a filled block weigh , compared to a Bowtie block . Plus after you where it out for bore size , it can be sold to someone that can use a bigger bore size . In the long run it might not really cost more to run a good block .