273 commando Build

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Robbie2734 said:
The heads on 1967 273 and 318s are ALL the same,
Closed chamber. I have a 67 formula S and and the heads are closed chamber. 1968 they went to open chambers when they introduced the 318.
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Fixed
 
I coulda swore Uncle Tony said that the SB Mopar was center sump and the combination of that and the windage tray led to starvation of oil...?

I don't recall though I haven't listened to his Gibberish in quite a while...
 
Dartswinger70 said:
I coulda swore Uncle Tony said that the SB Mopar was center sump and the combination of that and the windage tray led to starvation of oil...?

I don't recall though I haven't listened to his Gibberish in quite a while...
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:rofl: :rofl:
 
look at this picture .............
I took all the valves out of one of the 920 heads today and just out of curiosity I looked inside the dowel pin hole on the head and noticed the hole is NOT drilled all the way to the bottom of hole the same diameter. there is a 1/8" ledge that is narrower than the pin size.
is there a reason for that? should I leave that alone ? just could be an reason why the head gasket kept blowing not seating all the way down . I believe there is a special drill bit that has a flat shank at the tip .... no pointed not like a regular drill bit .
just trying to address suspicious looking issues on this build.

920 head dowel pin hole.jpg
 
Wow, thanks for posting that. Do you have the dowel? I would install dowel in block and measure the stick out. If stickout is bigger I would deepen the hole(that's what she said).
Others more experienced will chime in. I'm hoping that's what it is as it seems like an easy fix?
 
4spdragtop said:
Wow, thanks for posting that. Do you have the dowel? I would install dowel in block and measure the stick out. If stickout is bigger I would deepen the hole(that's what she said).
Others more experienced will chime in. I'm hoping that's what it is as it seems like an easy fix?
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dowels are in the block ... I will measure the hole depth to the ledge in the head and then measure the pin height sticking out of block. also I will lay the head on the block and see how it looks and feels . this is a different engine block now so I have the check the dowel pins
 
I’d grind the dowel shorter if needed. You stick a drill bit in that hole to go deeper and you’ll wallow the hole out in no time, losing the position accuracy. Dowel holes are reamed after drilling undersize.
 
gzig5 said:
I’d grind the dowel shorter if needed. You stick a drill bit in that hole to go deeper and you’ll wallow the hole out in no time, losing the position accuracy. Dowel holes are reamed after drilling undersize.
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ok I see ! the smaller diameter is the pilot hole for the actual larger pin size.
 
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