Is this a blown head gasket ?
- Thread starter mbaird
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I'd tear that down.
That is the plan . I wanted to check the bearings and I was a little uncomfotable with the ring end gap I set ( .016) . I was also concerned about the amount of oil going to the rockers.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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.016.. is that a typo?
pishta
I know I'm right....
I was going to say the clean piston may be getting steam cleaned by a coolant leak.
Nope . Instructions stated .04 per 1" of bore . Made me nervous though .
I am thinking .020
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
- Joined
- Jan 19, 2014
- Messages
- 26,611
- Reaction score
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That's the tightest spec I have ever heard of.
My KB107 equipped 367 ran very hot and locked up every time I shut it off. I tried everything. Finally I took the engine apart and reset the gaps from .0065 ring factor, to .008 and all was good. The LD at the new gaps was barely measurable on my small gauge.
At 4.04 bore, that is .032(top ring only) Some ended up a lil more.
I added a couple of thou to the second rings, from .0065 factor.
Car still went 93 in the Eighth at 3467 pounds, so I was happy.
It never locked up ever again, nor does the temp ever go over 207 anymore.. I can't even make it get hotter, unless I cover the 48 year old radiator.
I get that the hypers are a special case but;
IDK man .016 seems extremely small.
In your case, I would call the manufacturer.....
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These are iCon forged pistons . That was their instructions . But I would feel more comfy at .020.
Even the forged TRWs and Speed Pro’s say .004 per inch. Kim
MOPAROFFICIAL
If it has tits, it's a liabilititty.
MOPAROFFICIAL
If it has tits, it's a liabilititty.
The scuffing can be caused by dry cylinder walls, trash, momentary detonation during tuning runs.
Dry cyl wall is the usual suspect for most.
The crap in the pic looks like water n oil folks.
Dry cyl wall is the usual suspect for most.
The crap in the pic looks like water n oil folks.
Are you gonna clean out your inbox? Don't make me come over there.
With 0.016" top ring gap, you could well get ring end-butting with a cool running engine. You are on the right track opening the gap to 0.020". I have looked at the ring gap spec for a few different piston manufacturers & it almost seems like a lottery: pull a number out of a hat.
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