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.

Re: Hardblock?
 

Most replies are going to favor the hardblock procedure.

Re: Hardblock?
 

Yes

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.

Re: Hardblock?
 

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

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.

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.

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.

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.

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 .