Where can i get ahold of the machine draftings for LS and LT heads, intakes and blocks. I'm looking for deminsions, tolerances and GD&T.

 

That's going to be a big problem. GM rarely lets out product drawings, and the aftermarket folks like Dart, AFR aren't about to publish their stuff either.

The amount of information needed to describe all the dimensions on a head or composite intake manifold is huge. My guess is that our PCs couldn't handle it.

Your best bet would be to measure the parts themselves. A CMM would be useful here.


What is "GD&T"?

 

"Geometric Dimension and Tolerance"

 

Thanks!

FWIW, in the draw-it-on-paper days, an engine block drawing was on a piece of paper about 48 in. x 120 in. or longer. There could be multiple sheets this size. There would be separate drawings for the raw casting and the machined block. 1000s of man hours to complete these.

 

I don't think that they'd be too big to fit on the computer. Some of the projects i have had to complete were huge, with all the cross sections and alternate views. Thank you though for the responses, i'm not surpriesed to hear that, but ya never know until you ask. Thanks again!

 

Yeah I tried to get some LT1 cylinderhead blueprints one time....A guy who used to work for GM actually laughed at me when i told him my intentions Why do you need them if you dont mind my asking?

 

Can we say enough information that it would have to be put on micro film??? LOL

Yeah good look getting that info.

Thats like calling AFR and asking them for their CNC programs.......

 

I need to design some parts for my major and then machine them. I have been tossing around ideas and i was wanting to get a hold of a set of drawings so i wouldn't have to spend the massive amount of time using a universal measuring machine to do it.

 

"Design" or reverse engineer? There's a big difference.

Why choose a complicated casting anyways? Is this machined part suppose to be functional or is it just a design/machine exercise? What about a V8 engine block in 1/4-scale? I'm talking just a "close" representation here. The information needed for a representation wouldn't be too difficult to find.

-Mindgame

 

No, Design is my main goal. I want to get all the deminsions and tolerances so i can use an intake and exhaust port design that i have been working on and an intake manifold that i have also been working on also. I just need factory LT1 or LS1 drawings to save time, but it looks like i'm gunna have to measure everything.

 

Keep in mind that OS is probably still using an Intel 486. Sitting right next to it is his slide rule and other favorite, the abacus.

OK... Design... with an element of reverse engineering.

Sounds like fun for someone. I think you summed it up pretty well though when you said ~spending massive amounts of time~.

Good luck.

-Mindgame

 

LOL!

My reference to paper drawing size referred to the amount of information on the drawing. Of course you could get the gigabytes of drawing into your computer wb3s if you had the appropriate CAD software that the OEMs use.



I'm with MG here, wb3s. Methinks you are getting into something WAY more complex than you realize. If you are trying to smoke a non-engineer instructor by designing ports and manifolds in order to get a grade, it might work, but if you are actually "designing" ports for LT and LS heads, which are vastly different, you are going about it the wrong way, IMO (never Humble).

No offense, but the terminology like "machine draftings" and "universal measuring machine" does not seem to be what most folks call these items. "Part drawings", "blueprints" (?) and "CMM" aka "Coordinate Measuring Machine" are what folks in the business use.

FWIW, measuring everything won't give you much clue as to tolerances.

Good luck!

 

FWIW, I was at SEMA and we were actually approached by a rep from GM. Long story short is that GM is now offering up CAD drawings and technical info about their engines and vehicles. I know, I know... I thought the guy was pulling my leg too, but they way it was put to me is that GM now has a new outlook on this stuff. They offer it up to help the aftermarket with ease of producing new products. They know that in certain markets the aftermarket is what helps drive the sale of their product.

If you havent tried recently it might be worth while to look into it again. You might be suprised to find GM offering up this type of information.

 

Cool!

A long time ago (1970s) I was making some THM400 parts for the aftermarket. They had been (poorly) reverse engineered by my customer. I mentioned it to my "deep throat" @ GMPT and received a complete part drawing, with the General's blessing. They wanted the aftermarket to produce good parts. The drawing was so specific as to dictate which direction a shaft should rotate when being ground. You machininsts or production engineers should kow why. A cigar or beer on me if you're the first with the correct answer.

 

Dad gummit... I read something about this a while back OS. You have me really thinking now.

Has something to do with the microscopic burrs and the direction in which those burrs face is important. Common sense would lead me to say that they should "point" away from the direction of rotation.

Am I even close?

-Mindgame