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Author
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Topic: Shocking HardBloc revelation?
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V8 Thumper
Gearhead Posts: 4777
From: Phoenix, Arizona
Registered: Dec 2001
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posted 06-18-2002 09:06 PM
 
Ok guys, verify this for me. I was just told by my machinist that block fill takes up to three months to cure!!! Sure, you can spin the motor around on the stand after three or four days to fill the other bank's jacket, but three frigging months before you can run the motor? IS THIS TRUE? No, I haven't filled my block, but was concidering it. Now I'm not so sure that it's a reasonable option for a 6500 rpm s/s motor that's going to start assembly this weekend. I'm a patient guy, but jeez... 
[This message has been edited by V8 Thumper (edited 06-18-2002).]
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kid vishus
Gearhead Posts: 7251
From: middle of NC
Registered: Oct 2000
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posted 06-18-2002 09:41 PM
Well, I'm not sure but I doubt it. The motor I ran last year got one side filled on a Tuesday night, the other side filled wednesday night, assembled thursday and put in the car and started friday and went racing saturday. At the end of the year, the cylinders looked good. I would still be using that block if it were not for a cracked main web.
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 06-18-2002 09:45 PM
Not at all. It takes about two weeks to cure fully.  ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl
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V8 Thumper
Gearhead Posts: 4777
From: Phoenix, Arizona
Registered: Dec 2001
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posted 06-18-2002 09:49 PM
Thanks kid, that's closer to what I thought. You only run yours for 10 seconds at a time  ... would a (primarily) street motor be any harder on the fill compound, to require such a long cure time? I can see a week, maybe two at most to fully cure; then again, I don't know it's composition/chemical compound to open my mouth much farther than I already have 
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V8 Thumper
Gearhead Posts: 4777
From: Phoenix, Arizona
Registered: Dec 2001
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posted 06-18-2002 09:52 PM
Hearing it from you two guys, that settles it. HardBloc the brand, or do you have another that you prefer?
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kid vishus
Gearhead Posts: 7251
From: middle of NC
Registered: Oct 2000
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posted 06-18-2002 10:11 PM
The one I did the overnight job on was HardBlok. I have also used the Moroso filler, but they admitt it expands while it dries, and that it takes longer to cure. I have Moroso filler in the block I am using now, but we let it dry almost 4 months before we machined it (wasn't in a hurry so we let it set).
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jsracingbbf
unregistered
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posted 06-19-2002 12:43 AM
I ve always used hard blok in both clevelands and the 514 and I 've never had a problem. I usually pour one side each night then assemble it with in a couple weeks and usually run it within a month. I have never heard of this before. That means nothing though. I'm usually the last to know.
Jerry
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 06-19-2002 01:26 AM
Hard On, er Hard Bloc.  ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl
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Rory McNeil
Gearhead Posts: 1889
From: Surrey, B.C. Canada
Registered: Nov 2000
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posted 06-19-2002 02:01 AM
Uh, I hope you haven`t had the block bored & honed yet, if you plan to fill it. When I filled one of my 428 blocks several years ago, I was told to let the block sit at LEAST 2 weeks before machining, a month would be better. (It was not Hard Block, but rather a generic product bought thru a well known FE Stock elim. engine builder.) I poured one side, torqued down a cyl. head, after letting it sit overnight, I did the same to the other side. I then put the block in a small room with a space heater for 2 weeks, to help speed up the process. I then had the block machined. The filler "squeezed" the cylinder walls smaller, which was very evident by watching the strain gauge on the Sunnen CK10 machine.If the block was filled AFTER all machine work was done, I would suspect scuffed pistons would be very likely result. I don`t think I would want to put much filler, if any, on a true sreet car.------------------
78 Fairmont 428 4 speed 10.20@130mph
80 Fairmont 302 5 speed 12.8@105mph
85 Mustang NHRA Stocker under construction, 302 5 speed
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V8 Thumper
Gearhead Posts: 4777
From: Phoenix, Arizona
Registered: Dec 2001
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posted 06-19-2002 07:45 AM
quote:
Originally posted by Rory McNeil:
Uh, I hope you haven`t had the block bored & honed yet, if you plan to fill it... The filler "squeezed" the cylinder walls smaller... I don`t think I would want to put much filler, if any, on a true sreet car.
Yes Rory, the (Mexican ) block has been bored, honed and decked...
It will be a true street car that I'll run at Fontana or Irwindale once in a while, after I get it all dialed in. Well sh*t, decisions, decisions... [This message has been edited by V8 Thumper (edited 06-19-2002).]
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 06-19-2002 10:06 AM
You always fill the block FIRST guys. ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl
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Ryan Wilke
Gearhead Posts: 3237
From: Stanton, Michigan, zip 48888
Registered: Oct 2000
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posted 06-19-2002 03:32 PM
Rory,
As you touched on - you should install a cyl head or torque plate on BOTH SIDES and torque the MAIN CAPS before installing the hard bloc. Then two weeks later, do the machining. just my 2 cents,,,, Ryan
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Fordwiser
Gearhead Posts: 535
From: Metamora, Illinois
Registered: Dec 2000
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posted 06-19-2002 07:13 PM
Over the winter a friend Hardbloked his 347 (plain 2bolt 302 block) This engine was built last year and ran all of last year.I think all he did was glazebreak it and put new rings in. He did torque the mains and put a head on it while it cured. So far he hasn't had any problems, runs consistant 10.50s. HardBlok isn't suposed to expand or contact like others do,if I had a choice I would fill before, but it can be done afterwards
Roger
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