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Old 07-09-2019, 09:26 PM
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Craptastic head work

Brodix heads.
This is why I donít trust machine shops.
I bought these used but freshly machined with paper work. These were supposed to be done by the best head guys in the South East. Maybe itís acceptable to them but itís not for me.
Donít judge my washing machine work bench or my straight edge. Itís straighter than this valve job is.
2 exhaust valve leak and 2 intake valve leak solvent. A vacuum test would fail miserably.
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Old 07-09-2019, 11:23 PM
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That looks like valve job from a bottom end flat rate shop or a kid in first year autoshop just working on a practice head.


That is not correctable without new seats, probably valves, very likely guides.


Those are very tired heads. How much did you have to pay for these if you don't mind me asking?


What's wrong with using the washing machine for a work bench?


Bogie
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Old 07-09-2019, 11:51 PM
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I havenít taken them apart yet. Guides are new, valves look new. These heads have steel steel inserts.
Springs are new but I donít know the rates. I just know they are 1.55od and set up at 1.800 so itís likely a solid roller set up with a .700 lift. They were made in Ď09 so Iím sure thereís a number of laps on them and at least one blow up.
Thereís plenty of room to cut them another .010 or so. I was told they were 245cc runner and a 2.14/1.60 valved and supposed to flow [email protected]
The pictures sent to me didnít paint the same picture so I was very aware they would need something. I gave $525 for them with the matching intake they were flowed with. A good enough deal I can work with them.
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Old 07-10-2019, 07:30 AM
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Almost looks like bent valves holding them off the seats. Maybe they're new-ish.
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Old 07-10-2019, 08:33 AM
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I started vacuum checking all my valve work 20 years ago, takes only 30 seconds to do a pair of heads, and I have found that many of the single blade cutter systems like Serdi won't pass without a touch with a stone.
It looks like there are some different lengths valves involved there.
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Old 07-10-2019, 10:41 AM
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As long as you don't use the wifes washing machine as a parts washer...

Any chance they boxed up a set of cores, not the finished heads you were supposed to get?
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Old 07-10-2019, 11:08 AM
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Quote:
Originally Posted by AutoGear View Post
As long as you don't use the wifes washing machine as a parts washer...

Any chance they boxed up a set of cores, not the finished heads you were supposed to get?

Where I'm coming from on the washing machine deal is it's in my shop taking up my floor space so I'm not taking any responsibility until the rightful owner shows up with a truck. If I spill enough coffee on my shirt or run out of red shop rags I might just use it.

I bought them from an individual who claimed the machine shop he uses sends everything to Brezinski in WI. I called his machine shop and Brezinski to collaborate the story so it seemed legit at the time however I have a hard time thinking Brzezinski would have sent this out the door.
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Old 07-10-2019, 12:52 PM
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Quote:
Originally Posted by johnsongrass1 View Post
Where I'm coming from on the washing machine deal is it's in my shop taking up my floor space so I'm not taking any responsibility until the rightful owner shows up with a truck. If I spill enough coffee on my shirt or run out of red shop rags I might just use it.

I bought them from an individual who claimed the machine shop he uses sends everything to Brezinski in WI. I called his machine shop and Brezinski to collaborate the story so it seemed legit at the time however I have a hard time thinking Brzezinski would have sent this out the door.
On the surface in my first reply I thought that this was the result of shooting head seats and the valves obtaining different installed heights due to sinking or thinning the seats. However, in the light of a new day came more thoughts.

One, there are different lengths of valves used by Chevrolet not to mention the aftermarket. These can vary not only in total length but also with different stem margins above the lock groove.

Chevy has also used different lengths of intake valves from exhausts, and with different margins above the lock groove on the same head. So I guess getting this disassembled to explore the stem lengths and margin lengths by valve is in order to see if this is a mixed set

The next is to look at the seat cuts and from an intake and exhaust valve chosen to be your standard check the seated height above a taut drawn index line above the guide, this is because guides and spring perches may not all be the same height from the valve seat so you need a dependable measuring point.

Hard seats in aluminum heads are replaceable, grinding a seat to where it sinks the valve is not good form outside of grandma's grocery getter. The other answer to seats worn that badly is to reshoot the seat for the next larger valve diameter if such is available. Not to be confused with sinking the exhaust valve on older pre Vortec heads to get an action similar to the Vortec chamber where the beak between the valves redirects the intake flow away from the open exhaust during overlap in this case the intake flow is above the slightly lower exhaust which reduces mixture loss out the exhaust which then is thought to increase the amount of trapped mixture in the cylinder.



Bogie

Last edited by BogiesAnnex1; 07-10-2019 at 12:58 PM.
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Old 07-10-2019, 03:47 PM
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I use my washing machine to wash spent 12/20 ga shotgun hulls for reloading, but I don't have a wife.
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Old 07-10-2019, 06:56 PM
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Quote:
Originally Posted by johnsongrass1 View Post
Where I'm coming from on the washing machine deal is it's in my shop taking up my floor space so I'm not taking any responsibility until the rightful owner shows up with a truck. If I spill enough coffee on my shirt or run out of red shop rags I might just use it.

I bought them from an individual who claimed the machine shop he uses sends everything to Brezinski in WI. I called his machine shop and Brezinski to collaborate the story so it seemed legit at the time however I have a hard time thinking Brzezinski would have sent this out the door.
Maybe Brezinski did the initial work when new, but they've been "touched up" or "refreshed" by the best Billy Bubba's in the 'haller since then?? Clem and Cletus with the worn out Souix set-up in the Lean-to next door to the tire shop LOL
You said South-East, I couldn't resist.
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Old 07-10-2019, 08:46 PM
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Youíre prolly not wrong Eric.
I got time to play with them today. I took the springs off and the seats are....something. Not trashed but kinda stained or pitted. Supposedly they sat bagged up for 3 years. I lapped them real good and in about 30 seconds later they changed sound and cleaned up well enough. The contact area is about .090 wide.
The springs are new, titanium retainers, 10í keepers.
Valves are new and spec at 2.08. The seals are new. Intake side only. Guides are good at .0015 intake and .002 on the exhaust. They have XVT laser etched just below the lock groove. I donít what that means.
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Old 07-10-2019, 10:33 PM
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.090 is a pretty wide seat for a race head valve job.



How do stem lengths check out?


Bogie
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Old 07-11-2019, 10:37 AM
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Almost looks like bent valves holding them off the seats. Maybe they're new-ish.

That was my first thought. Do they seem to have been lapped in? Chuck the valves in a lathe and see if they run out.
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Old 07-11-2019, 08:15 PM
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Looks like the intake valve in pic number 3 has an issue with the lap running to the edge of the valve (toward the margin) on one side.

Almost looks as though it is resultant of a valve guide that is not perpendicular in the head.

Maybe it is just the blurry photo,
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Old 07-14-2019, 03:39 PM
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Update:
3 bent valves
2 junkie Seals
6 Bell Mouthed guides. Wider on the top and bottom than the middle.

Not much else to report. I haven't been able to mess with them much.

Over all valve heights are pretty close. Some are branded different then others and have slightly differing lenghts. I assume those were replaced at a refreshen with whatever the shop is using that week. The combination of the slightly different brands, nominal over all lenghts, some were likely ground on the stem, and whatever seat heights and 3 bent valves seem to be stacking up to the differences.
Im sending it the shop for seat and guides as I don't have the tools for that. Does someone need some work to do?
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