Hardblock?

[Hacksaw]

Didn't know there is a bow tie block that matches a 273 Mopar.! Oh! The curse of trying to make 50 something old run with modern stuff.

[David Lee]

I guess the real cure without buying a 3K block and getting thick walls, would be to sleeve a 318 to 273 bore size

[Tony Goodman]

I believe a Dart SHP block is less than $2000. There is also the money you will spend on the stock block you will not have to spend on the after market block. Filling, cleaning, checking... So that cost can be deducted off the price of an after market block also.

[Monte Howard]

Save yourself the aggravation, I hard blocked my 010 block and went .060. With new cp pistons. After the 1st pass the car slowed down. Made about 20 more runs on it. Tore it apart this winter and the cylinders where .008 out of round. And my new pistons skirts where scuffed really bad. Do yourself a favor and just get a SHP block and be done with it.

[carl hinkson]

Originally Posted by Monte Howard

Save yourself the aggravation, I hard blocked my 010 block and went .060. With new cp pistons. After the 1st pass the car slowed down. Made about 20 more runs on it. Tore it apart this winter and the cylinders where .008 out of round. And my new pistons skirts where scuffed really bad. Do yourself a favor and just get a SHP block and be done with it.

Best advise ever !!!!!!

I was going to post that as I have seen what you observed with your build but most think I post that to sell new blocks.

[randy wilson]

Originally Posted by Monte Howard

Save yourself the aggravation, I hard blocked my 010 block and went .060. With new cp pistons. After the 1st pass the car slowed down. Made about 20 more runs on it. Tore it apart this winter and the cylinders where .008 out of round. And my new pistons skirts where scuffed really bad. Do yourself a favor and just get a SHP block and be done with it.

This guy found the same thing I found out.

[SSDiv6]

If you want the best, use MasterFlow 885, formerly known as Embeco 885.

MasterFlow 885 has a metallic aggregate, it is non-shrinking and way stronger than HardBlock or the Moroso product after cured.

[carl hinkson]

My rule of thumb if you have to fill the block your using the wrong block,


Cylinders change during heat cycles and and never come back to the original machined size.

[carl hinkson]

Originally Posted by Tony Goodman

I believe a Dart SHP block is less than $2000. There is also the money you will spend on the stock block you will not have to spend on the after market block. Filling, cleaning, checking... So that cost can be deducted off the price of an after market block also.

You can buy an SHP block all machined and shipped for that kind of money.

Things that should be addressed when having one of those blocks machined.

– Main housing bores chamfered
– Freeze plug holes and rear cam hole are chamfered
– Line honed to at least the middle of the spec or high side if needed
– Decked to your demension
– Bore to your spec
– Plate honed using the same gasket and hardware that will be used in the end build
– Lifter bores checked and honed to the lifters that will be used in the end build
– Top of lifter bores chamfered
– Bottom of the cylinders chamfered
– Tap oil galley holes deeper
– Chamfer Distributor hole for O rings.

[David Lee]

that is great advice for chevy people, how about small block mopars?