427 SBF

89 Fox 427 said:
They do but it's a 10an orb whereas the stock block was 1/4npt
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Then I think you have it figured out with the parts you posted in post# 1620. Don’t forget to buy a plug for that top one. As we discussed before my older block doesn’t have that one.
 
Did you remove a plug and actually see it's an o-ring seal? My Dart Little M and Bowtie blocks have that same size passage in the same place, but they are NPT threads.
 
Mike Beck said:
Did you remove a plug and actually see it's an o-ring seal? My Dart Little M and Bowtie blocks have that same size passage in the same place, but they are NPT threads.
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No but I need to verify. Looking at their instruction sheet it says 10an but looking at it on the block I think they're full of shit and it's normal npt
 
89 Fox 427 said:
No but I need to verify. Looking at their instruction sheet it says 10an but looking at it on the block I think they're full of shit and it's normal npt
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Do you have a -10AN to thread in there? Tow different threads. If the -10 doesn't screw in easily then check and see if it's actually NPT, I think it's 3/8", but it is a common size.

Maybe Dart has info on their website via a PDF file or something?

The valve train link was good. Glad to see they addressed the issue of the lock extending below the retainer. Advised to avoid that, but didn't say it was a big no-no either.

Strange to see they prefer 7* stuff while every engine builder I have dealt with prefers 10* locks and retainers, plus if the option is there they prefer bead lock over square lock.
 
The pdf from dart is what I was looking at. Yea I read that about 7 degree and seems to go against what I've heard previously
 
Is there room at the top to use something like this?
It doesn't look like it, but I try not to assume...


 
Steve439 said:
Is there room at the top to use something like this?
It doesn't look like it, but I try not to assume...


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Unfortunately not much room against the block but I think I got it sorted out
 
I received the new valves locks today from promaxx.

They sent the wrong ones.

I guess I'll wait a few more days, no big deal.
 
89 Fox 427 said:
I received the new valves locks today from promaxx.

They sent the wrong ones.

I guess I'll wait a few more days, no big deal.
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My project is on a two week hold, they went away racing. No big deal, I really don't like racing in the heat anymore.
 
Every day I'm not working on it is another day that makes me not feel like fucking with it.

I really don't understand locks, how they SHOULD fit, what is normal (variance), what should be replaced..

For shits I put these new locks on a valve. They seem to hold the retainer with no springs. When I tap on the retainer, they fall off. They rock in the retainer slightly, but so do the ones that came with the heads. And the installed height is 1.74 to 1.79 (vs the 1.8 they are supposed to be)

They are definitely a different offset than the old ones and look nearly identical to the comp cams ones I bought and sent back.
 
Locks are funny things.
From what I've read it's not the part that sticks into the valve that holds them in place.
That just to keep it together while installing everything.
It's the clamping pressure of the retainer pushing the locks against the stem.
I'll see if I can find a good article or if maybe I drank too much cough syrup.
 
Steve439 said:
Locks are funny things.
From what I've read it's not the part that sticks into the valve that holds them in place.
That just to keep it together while installing everything.
It's the clamping pressure of the retainer pushing the locks against the stem.
I'll see if I can find a good article or if maybe I drank too much cough syrup.
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Gotta be careful with the Nyquil
 
I posted a link here but fuck knows what page it's on now
 
Oil pan is on. But very likely it will leak. Moroso engineers aren't too bright and put the front corner of the pan dead nuts where there's supposed to be a hole for another bolt. I smeared a little bit of silicone around that hole in the block just in case, but not thick at all. After torquing down the pan, there's no way it's not going to blow oil past it. I'll let the dyno guys fix it when that happens.20250711_095658.jpg20250711_105204.jpg
 
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