Does anyone have a clue as to where i could obtain parts drawings or blueprints for the stock LT1 heads. I am attempting to design some "hemi" heads that will fit on to my LT1 but i need very precise dimensions as you might imagine. If i could get a CAD based file that is compatable with AutoCAD it would be an enormous help. But any info would be appreciated. Thankyou.

 

that sounds like quite an undertaking

 

It will be an enormous undertaking. However, upon completion i have no doubt that there will be some people in this forum interested in owning there own LT1 Hemi!

 

Find someone deep in GM Powertrain and ask them.

Seriously, you are in WAY over your head.

It would be easier to reverse engineer it by using a CMM to measure a bunch of LT1 heads and DC "Hemi" heads. Just copying what DC has done doesn't make it work on an LT1. You are looking at many 100s of thousands to do something that MIGHT work. Bet you don't believe that, but I'm probably way low on the cost estimate.

Of course if you already have a complete CNC engine shop, flowbench, dyno, CAD hardware/software, and most importantly, a GREAT engine/head designer whom you now pay over 100 LARGE per annum, you are a leg up.

Am I trying to rain on your parade? Absolutely! Even if you just won the mega-millions lottery you are looking at a hole that will eat all of it.

The easiest way to have an "LT1 Hemi" is to buy the DC engine and rebadge it. It still won't be a true Hemi, but that never stopped marketing.

Sorry to be so harsh, but a one word response would probably have been insulting.

Oh, the one word would be....YGBSM!

My $.02

 

I would be happy to get my hands on some CAD data of an LT1 head just to experiment with some CNC porting. Building my own data from CMM inspection would be way to much work.
And to the starter of this thread.....if you can engineer/build a set of heads?

 

just get these http://www.araoengineering.com/Chevy/chevysmb.htm

 

I figured i'd get plenty of discouraging statements. and really all i am going for is the horizontally opposed valve configuration and not the true HEMIspherical combustion chamber. I know there is a man who builds Racing engines by the name of Sonny Leonard. He designed hemi-heads for GM blocks. Basically what i am trying to do is use a similar combustion chamber design in a head that will fit the LT-1 motor. As to actually producing the heads, its a bit of a long shot. I think i might convince someone who does have all of the equipment that it is a good idea and then collect royalties on the patent. Maybe i can, maybe i can't. Wont know till i try i suppose. And besides it would be a fun project at the very least. Thanks for the 2 cents though, its a start .

 

Oh, and those 32 valve heads are awsome by the way! But its really the novelty of the "Hemi" that i think would sell.

 

Still need some blueprints.....anybody? I'll pay.

 

Being that cylinder head design is probably one of the most complex tasks facing an engineer, I am pretty sure that GM is not going to publish their blueprints. You might want to search the web for patent information, to see what kind of stuff GM has patented for heads. Patents are pretty descriptive, and it would probably be your best bet, since you'll never get real blueprints. If you were to find them, they be fake or illegal.

I totally concur with OldSStroker here. However, if you seriously want to begin this project, I would do what he said: reverse engineer the head on a CMM that feeds to CAD software.

 

hate to get on the its not giong to happen bandwagon, but besides not being able to find blueprints you're using the wrong software. it would make no sense to look at a 2d drawing of a complex 3d part, and besides that when you get to parts with compound curves autocad will have reached its limitations when drawing in 3d. need to switch to pro E or something along those lines and make 3d models. but the biggest problem with your idea is WHY make a hemi head for the lt1 the ported stockers and aftermarket 23* heads seem to be doing one hell of a job making hp in these cars. sorry in my book novelty doesnt support a 10k set of heads that flows what a good set of traditional heads does. and 10k a set is probably low balling it given the huge developement budgets required and the likely limited production numbers not allowing for diseconomys of scale.

 

look up the patent info? not a bad idea. and yes, blah blah blah, you cant do it, blah blah blah, too expensive, blah blah. Why dont you just tell me i'll sail off the edge of the world for trying to do it? That kind of thinking will never accelerate the progress of modern mechanical engineering. And as for the novelty of the Hemi, novelty sells. but besides that the hemi heads are renowned for their performance on the drag strip, especially burning alchohol. Maybe i will try and fail, but atleast i tried.

 

By the way i really do appreciate the feedback even if most of it is somewhat discouraging.

 

If you are designing heads from scratch, why would you need "blueprints" of existing heads? You need the c-c bore spacing (common knowledge), the x-y locations of the head bolts relative to the bores, the x-y locations for the pushrods, and the location of the coolant passages (buy a head gasket ). The combustion chamber volume is defined by the current head... use 54cc. Beyond that, what do you need? If you are capable of designing and building hemispherical heads, you should be able to figure out the "givens".

 

could much be done to improve performance over the 32-valve heads? increasing the efficiency and slightly higher compression gains wouldn't be near as effective as the greatest bottleneck in heads.. flow.. now if you really wanted to get crazy eliminate the rpm bottleneck of valves entirely.. "spherical rotary valves" http://www.coatesengine.com/