usa1racing

Does anyone have a drawing or CAD file (AutoCAD, Solidedge) of the front of the SBC block, namely the bolt holes for the front motor mounts and water pump bolt holes? I would like to make my own motor plate and would rather have a drawing to go off of than measuring.

chesterfield

If you ever find cad 2d or 3d sbc please PM me and let me know where I can get them. For now this is all I got and I can't verify its acuracy.

usa1racing

Fantastic! That's exactly what I was looking for. I read on an engineering forum that if you know someone who is a SEMA member, they might be able to request CAD files of parts. I can't verify this, but it's worth a try. Thanks again!

Sonix

iTrader: (1)

Nice! I was thinking if I ever went with a motor plate, i'd probably make one, I mean, it's a pretty simple piece eh?
Let us know how it goes.

bjm323

Nice. You wouldn't by chance have any drawings for a big block?

Pocket

iTrader: (24)

Freakin sweet, whered you find those dims?

No cam dims thou

Oh well Ill have a basic 3D of this bad boy in AutoCAD by the end of the week now

Id be happy to share

Apeiron

Which cam dimensions do you want?

JoBy

These are the same ones as individal files.

Pocket

iTrader: (24)

CL, Dia and depth would be nice

Also a top view where exactly is the dist at

chesterfield

What bugs me about these drawings is when I see numbers like 9.12 I have to wonder if it is really 9.125. Or is 12.62 really 12.625? I know for something like a engine plate that's probably accurate, but if I was making a 3d model and I'm working from the front to back and losing a small fraction at each bolt hole, am I going to be way off at the last one?
I saw on one of these car shows on tv some company was making custom brackets and they were using some digitizer to measure the block. I wish I knew someone who could do that for me. We know how GM can have poor quality control when it comes to manufacturing stuff and I wonder if you used drawings like these to manufacture some product, would it fit every block. In other words, I don't trust them. I've tried to measure off a block before and its hard to find a reliable absolute zero to work from.( core shift, crude castings,etc.) I hate to make precision models that aren't precise.

Apeiron

The dimensions of the block casting can vary from pouring to pouring, but for the most part the machined dimensions are fairly consistent (within tolerances not listed here).

Notice that the locations of the holes are specified with baseline dimensioning, so you're not losing a small amount from hole to hole.

Pocket

iTrader: (24)

Heres some more dims not shown in the other one

Not complete at all and some things absolutely dont add up to actual drawings

Few good parts thou, like the cam hole and crank diameters

Anyone have a diagram for the timing cover or waterpump bolts/holes sizes?

usa1racing

As a side note, I picked up the aluminum plate to start building the plate this weekend. I originally went after a 12" x 36" piece from a scrapyard, but ended up with a piece that's probably 18" x 96". Hopefully I'll be able to get 3 front plates out of this piece. I'll probably start making the one for my '69 first as the motor is already out of it and I have a bare block to stick in for measuring and test fitting.

I'm curious if anyone has opinions on using some type of insert inside the bolt holes. I'd like to drill the holes for the water pump bolts and front motor mounts bigger than 3/8" and insert steel spacers that would go between the bolt and the aluminum plate. These would probably have to be pressed into place. I'm hoping this would prevent elongation in the bolt holes after repeated removal and reinstallation.

Apeiron

The Chevy Power book has all sorts of useful diagrams and dimensions.

Pocket

iTrader: (24)

Ive given up on those dims

They are over an inch off in multiple areas compared to several parts I modeled directly

This is a fudge-it model Ive got so far, Ill eventually break down and drag a bare block into my room to model correctly

This will do most people for a rough size and placement

PM me for the drawing

Sonix

iTrader: (1)

What the heck program did you use to model that?
And yea, send me the core files if you can, that'd be grrrreattttt. </Lumbergh>

Pocket

iTrader: (24)

AutoCAD 2002

PM me your email

Pocket

iTrader: (24)

Sent:
Sonix
TT355Z28 - let me know about those motor plates

Twin_Turbo

iTrader: (25)

I hope I can still get that drawing? It would be excellent for some of the stuff I'm working on...this for instance. I made a very rough model of the engine and rtans, didn't want to waste too much time on that



My email is twinturbo @ home.nl

Thanks,

Marck

jonmark1985

For the intake manifold and intake ports use a later version like 2007, the loft command would work great like that. BTW whats it look like when you render it?

Pocket

iTrader: (24)

Either the link is bad or your mailbox is full

Mind if I get a copy of the C4 IRS once you get the block/heads/rotating assy?

Jon ~

Twin_Turbo

iTrader: (25)

Mine? It's the right address but how large is the file? If it's larger than 5 megs or so I can not receive it there, I can @ twinturbov8 @ gmail.com

That's not a C4 IRS. It's my own, I designed the double a arm IRS myself.

The diff in the model is a pre 80 iron eaton diff w/ a corvette C3 80-82 batwing (the one in the picture is a complete C4 dana 44). You can have all the models like the batwing, the diff, I have the complete earlier C3 susp (the iron case eaton one) w/ the trailing arms and all, I'd just rather not share the double a arm IRS because of all the hours and work I have into that.

Pocket

iTrader: (24)

I only have AutoCAD 2002, no loft command here, I dont really need it anyways
Here is an intake i made without that command



I dont render much, this is a VERY old drawing. Ive change about everything on it since then



Email resent, its 7.82Mb
Hope its helpful

The diff, batwing, and the ends of the axle shafts are really all I was looking for since I cant really modify those when I swap it in
I understand fully what time goes into calculating suspension geometry and aligning A-arms with your suspension package

I didnt know C3's had an IRS, Ill have to look into that

My concept is to use the diff from a C4 with resized shafts. I would have to remake some tubular A arms to fit the car
Planning on a pullrod setup with inboard disk brakes

Heres something I made in the FSAE, where I learned about the adv suspension stuff

Twin_Turbo

iTrader: (25)

The C3s (and C2s) have trailing arm suspensions with pretty poor toe control. That's the only real difference between C3 and C4, that the C4 uses 2 forward rods that pivot on both ends and have a rear toe control rod to control toe (although in the case of the C4 it's not perfect the way it pmounts off the center) The C4 system is really a development of what racers had already fabricated from the C3 IRS, check out the greenwood 5 bar system, you will immediately see where the C4 comes from (even though greenwood had it right when it comes to the toe control system, the c4 has it almost right LOL )

The C3 & C4 batwings are not the same, the width differes by exactly 1 cm and the C3 batwing is a lot bulkier than the C4 one. Even the axle offset in relationship to the batwing bushings is not the same. I also don't have the models for the C4 bearing assemblies. The Halfshafts are the same 1350 type as most C3s, only they are very long. I can give you a 1350 type halfshaft and you can then change the length to what you need. I have the u joints and stub axles and all the other tids and bits, just not the Dana 44 or Dana 36 diffs.

Synful

good job.

now import it to VIZ render and make it work

Phishman92

SOOOO happy to see this many CAD files in this thread Just graduated BSME last may and after working for a bit I plan on doing almost all my work on the computer first to make the planning/design stage easier.

Does anyone know where to get drawings of the ENTIRE car? I'm sure whatever program gm used back in the 80's (may have even been drafted by hand!) is long gone but if someone updated it to Solidworks or Inventor they would be my hero

jccaclimber

If all else fails you can get anything converted to igs or stp and then import it in, assuming you can find that stuff at all.

gunner53227

I wonder what the tolerances on those engine blueprints are. They seem like pretty open dimensions.

racing geek

iTrader: (5)

I could not agree more. It would be fun to play with this stuff in my Drafting classes (still a senior in high school) since I already finished almost everything required to be done in the year... flash games are getting boring.

lilnebel

racing geek, if you want to do draw/design try working on a lowering spindle im in school right now about 300 miles from my car and im not able to look at the spindle but i have access to a full machine shop use solid works if you can cause then i can program cnc G-code. just an idea/challenge

racing geek

iTrader: (5)

Based on the last thing you wrote, you make it sound like if I make the rendering, you will make the spindle... is that right?

Where can I get a spindle to get dimensions off of? I'm not taking it off my car because I'm not 100% sure if I'll be doing a brake upgrade in the spring, and I don't want to have to pay for one from a junkyard.

Pocket

iTrader: (24)

Then you are SOL

There are no dimensions of a spindle online