LS Conversion Parts Problems

[Twentyover]

Well, so far my LS engine conversion (Trailblazer SS LS2) is turning into a big clusterfook. Dressing the engine as I'm taking it to Oregon where it will meet it's new home. Needing to get it dressed, loaded,along with the transmission, rear end, and a pile of suspension parts, by Friday so I can cart it across country over the long weekend.



Problems so far-

Transdapt 1" setback adapters hit the block casting FEAD bosses. They hit the bosses w/about 1/16" clearance between the adapter plate and the block surface
Mast oil pan is not square- it rocks on the pan rails.

Has anyone else encountered these conditions, and how did you address them?

[andrewb70]

Greg, if the pan is rocking on the block, then there are machining issue. The gasket may take care of this, but it would still bother me.

Andrew

[jwcarguy]

Greg,

The Transdapt adapters aren't the most expensive, so that may be a issue with proper fitment, compared to some plates like the ATS plates from Speed Tech or the "Sliders" from Dirty Dingo
You may want to look and a different brand and try to keep with products from the same company for the swap, since they were designed to work together

As for the Mast pan, now you have me concerned! I finally received my mast conversion pan, after waiting a few months to get it, and am in the process of assembling the engine, which I will have done this weekend and don't want any issues with the pan
I will go and check mine out and let you know if I have the same issue with mine


Jeff

[Twentyover]

The pan isn't out of square like I thought- It's banging into something inside the engie. I levered the pickup away from the side of the block to the full extent of it's travel, and the condition improved.

It's possible that the intent was for the pan gasket to provide adequate clearance between the pan and the guts of the motor- of course, I'm unable to check that, since the pan cam without a gasket, instructions, part number for a gasket, or anything that would indicate Mast gave a rats a** about actually putting the pan on a motor. Guess that's too novel a concept for these boys from Texas.

At this point, I'm calling the Transdapt parts junk. Tough to screw up a flat plate with a half a dozen holes in it, but they have suceeeded. Good Work, guys! Again, inadequate instructions (little more than aparts list), and some of the screws don't fit.

I'm almost ready to tell the aftermarket to screw themselves and go back to a sbc.

[Z06vet]

Did the mast pan come with new pickup? The holley pan does & wont work with any other pickup.

[Twentyover]

It does and it's installed. There is a relief in the pan to clear the pickup (OK, i's bulged on the outside, I don't remember what the inside of the casting looks like. )

This may be a gasket issue- But I don't know that because Mast isn't responding to phone calls (3 today) and doesn't provide squat for information with the pan.

[andrewb70]

It does and it's installed. There is a relief in the pan to clear the pickup (OK, i's bulged on the outside, I don't remember what the inside of the casting looks like. )

This may be a gasket issue- But I don't know that because Mast isn't responding to phone calls (3 today) and doesn't provide squat for information with the pan.

Greg,

I do believe that all LS (trucks and cars) pan gaskets are identical. Try FelPro PN OS30693R

Andrew

[Reactor]

Just installed the Mast pan on a new 376/525 and we had to clearance something on the windage tray or it attachments. It was barely hitting as I remember and was no big deal to clearance for the pan. Sorry I am not more specific, but it was a bracket or bolt stud for the tray. We did not have to remove the tray as I remember. Reactor

[Reactor]

After looking at one of my pictures, it may have been the bracket for the pickup that bolts to the windage tray, directly under the pickup. Hope that helps

[Twentyover]

I guess I'm just venting. I figure if you spend $400+ buck for a pan,at least they can do is include a set of frickin instrutions and part numbers. And tell you what you may need to modify for something to work.

GM builds millions of these deals a year,they're pan costs a fraction of the purportedly better mast pan, I'll I'll bet you they don't have what I consider a quality problem.

I just sat in a meeting until 9 this evening with Japan,and we were getting beat up about parts that were 3 sigma from nominal on the low side. Less than 0.4% of parts were non-compliant. And mast sells a high dollar pan, not a commodity part, that doesn't go together without modification. No wonder the Japanese consider us losers.