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Old 02-17-2022, 03:12 PM
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Default 1967 400 lifters
Is there any difference between a 67 400 block and a 76 400 block when it comes to lifters.
Im have a heck of a time keeping the lifters adjusted.


GTO George

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Old 02-17-2022, 03:54 PM
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No difference.

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Old 02-17-2022, 04:00 PM
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No difference.
I didn’t think so!
I am having a heck of a time keeping them adjusted.....they get tight and they get loose....weird!


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Old 02-17-2022, 04:53 PM
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Are you using poly locks? Or?

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Old 02-17-2022, 04:54 PM
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Are you using poly locks? Or?
Yes and also it’s not a 400 it’s a 421…….I’m bad!


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Old 02-17-2022, 05:02 PM
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421 heads? Press in studs could be backing out.

Polylocks need the top of the stud ground flat for the set screws to seat on and stay tight, another possibility.

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Old 02-17-2022, 05:07 PM
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What Bart said..... Are they initially setting and then loosening up?

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Old 02-17-2022, 05:44 PM
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What Bart said..... Are they initially setting and then loosening up?
Same heads that were on my wife's 400 engine, I think they are 6x. They are screw in studs, I replaced the studs with 7/16" and got roller stamp steel rockers but im have a heck of a time getting these things to stay adjusted.


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Old 02-17-2022, 05:46 PM
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No 421 block in 1967, so is it the heads that are 421?

The pushrods the correct length?


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Old 02-17-2022, 05:49 PM
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No 421 block in 1967, so is it the heads that are 421?

The pushrods the correct length?
421 engine, 6x heads sam pushrods and lifters that was in the 76 400 engine, I just switch everything over. Then i bought the upgraded studs and rockers.


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Old 02-17-2022, 05:56 PM
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Cam lobes going flat?

Those rockers are known for the rocker balls not being a good fit, possibly wearing in at this point. Watch out for bluing in the ball pivot area.

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Old 02-17-2022, 06:09 PM
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Same heads that were on my wife's 400 engine, I think they are 6x. They are screw in studs, I replaced the studs with 7/16" and got roller stamp steel rockers but im have a heck of a time getting these things to stay adjusted.


GTO George
My concern would be those rockers....

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Old 02-17-2022, 06:44 PM
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My concern would be those rockers....
This are the ones I bought (they are new), I thought they would be better then stock rockers.


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Old 02-17-2022, 06:56 PM
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Stock rockers or full roller rockers.

Anything in between reality isn’t worth using.

At least go for some proven Harland Sharp rockers, those roller tip stamped type rockers are sketchy at best in my opinion. Some folks have good luck with them, others not so lucky.

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Old 02-17-2022, 07:04 PM
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Stock rockers or full roller rockers.

Anything in between reality isn’t worth using.

At least go for some proven Harland Sharp rockers, those roller tip stamped type rockers are sketchy at best in my opinion. Some folks have good luck with them, others not so lucky.
I didn’t know that thanks.


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Old 02-17-2022, 07:16 PM
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I think it would be wise to pull those off and put the stockers back on before those rollers tips put any more metal in your engine.

I’d try to return them as defective because they likely are.

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Old 02-17-2022, 07:17 PM
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They are not only getting loose (ticking) they also get tight (where it starts to miss). And then I have to readjust them and it’s fine for a little while. Freaking weird!


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Old 02-17-2022, 07:19 PM
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I think it would be wise to pull those off and put the stockers back on before those rollers tips put any more metal in your engine.
I don’t think they are wearing, I haven’t noticed anything strange an besides it really dyhave any miles on them! Maybe 50.


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Old 02-17-2022, 07:21 PM
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Sorry if this was already answered but, has it been confirmed that the nuts are coming loose or something moving? Might try a little loctite blue and run the test again.

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Old 02-17-2022, 07:25 PM
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Sorry if this was already answered but, has it been confirmed that the nuts are coming loose or something moving? Might try a little loctite blue and run the test again.
Nuts are locking and they are not getting loose.


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