Re: 360 blocks
[Re: DusterKid]
#201723
01/23/09 10:09 AM
01/23/09 10:09 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Do 360 motors have a weak point around main cap 4? I have 2 blocks that with a new crank, cap 4 marks up the bearing. The one motor was supposively just line bored by a machinst, the other hasn't been to a machine shop yet. I know the one that hasn't been touch, could need lined bored, but the other one that was line bored I don't know if it wasn't done properly or is there something with a 360 block that will "fail" and allow this to happen?
I've never heard of any thing. There are plenty of
360 out there being raced. The only thing is that
the #2 and #4 cam bearings draw off oil for the valve
train
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Re: 360 blocks
[Re: DusterKid]
#201724
01/23/09 11:29 AM
01/23/09 11:29 AM
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Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
Rapid340
top fuel
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top fuel
Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
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Check the runout on the crank.
1971 Factory Appearing Duster 340 11.000 @ 122 mph
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Re: 360 blocks
[Re: DusterKid]
#201726
01/23/09 11:44 AM
01/23/09 11:44 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
Do 360 motors have a weak point around main cap 4? I have 2 blocks that with a new crank, cap 4 marks up the bearing. The one motor was supposively just line bored by a machinst, the other hasn't been to a machine shop yet. I know the one that hasn't been touch, could need lined bored, but the other one that was line bored I don't know if it wasn't done properly or is there something with a 360 block that will "fail" and allow this to happen?
The one thing that seems to be common between the
2 engines is the crank... it could be tweeked, have
it checked. Like was said above have a good shop
do the line bore... thats why I use Best Machine,
its great that they are local to me
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Re: 360 blocks
[Re: DusterKid]
#201728
01/23/09 01:35 PM
01/23/09 01:35 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Its not the crank, we've actually tried 2 cranks, one that we had turnt that is 10/10 and a brand new one that is standard. We measured the cranks and both are dead on for specs. The machinst that did the line bore we have had do our cranks before without an issue, but apparently he doesn't either have the proper equipment or the knowledge to properly line bore. He measure the block and said it was .003 out before line boring, but when we got the block back it still does the same thing as before. Hoping its just a bad line bore job and take the block to another shop and have it done and not go back to that guy anymore.
I dont know if this happened to you or not but the
machine shop I dealt with years ago, I had them line
bore the cam tunnel and the mains, well the cam tunnel
was done and they forgot to do the mains but charged
me for both. By the time I assm. the engine and
checked it the guy had moved out alot farther so I
ended up going to Best Machine with it and havent
gone any where since. What I'm trying to say is MAYBE
they forgot to line bore it(specially that much off)
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