HEMI Tech - Engine and Component Dimensions

I am at the point of building a mid plate for the hemi I got from racer-x. I am looking for a blue print or cad/dxf file of the bellhousing and starter. I have the 1 inch plate but need the locations. I have been looking but not found what I am looking for.
Tony

 

The file offered in post #7 offers all the dimensions for the block bell housing pattern that would, presumably, be what is needed for a mid plate, less the starter dimensions. Wilcap, the long time adapter company, offers an adapter plate for the early Mopar V8's (same as the drawing in post #7) with starter mounting provisions and, if desired, extended 'mounting ears' as an option. Their part # is 392-350 AT. this can be seen on their website www.wilcap.com

Hope this info is in some way useful to you.

 

Hnstray,
thanks, that is exactly what I am looking for. I will be using a quicktime bellhousing, and a GF-5R 5 spd. I need one with the ears, so I will be calling them today. With this info, it will be faster to buy one than build one since I don't need anything to special.
Tony

 

Looking for dimensions of a 331 regarding the exhaust manifolds.
What angle is the mounting surface of the head relative to horizontal ?
Is that surface perpendicular to the head surface (which would put it at 45 º) ?
OR is it at some other angle?

Tried downloading and opening the files that Stefan T had posted, but that's been 23 years ago.
eDrawings (dxf viewer) wouldn't open it.


Clicking on either just goes back to the HAMB home page.

 

Are you planning on building headers? On the OEM ex mans the only real differences is the direction the ex pipe opening is pointing. On my 331 in a '60 Plym I had to use ones that point towards the block/oil pan.

 

No, not planning that. I just wanted to confirm how the stock headers were oriented to the horizontal plane, ***uming the exhaust is pointing straight down.
I measured 23º angle between the mounting surface and the exhaust flange of the header.
This would infer that the mounting surface of the head is also at 23º ........or am I missing something?

Another way to state this is that the surface of the head where the exhaust manifold is mounted is 22º from a vertical through the head (1/2 the 90º "V")

 

ekimneirbo posted engine dimension drawings in 2019

 

I measured 24° where you have 22°. Will 2° make a huge difference ? Only if space is critical.

 

Folks might want to look at Post #26 on this thread for some good info on Hemis.

www.jalopyjournal.com/forum/threads/new-magazine-introduced-july-11.1198200/#post-13644686

 

hmm, didn't see a mention of the angle.

The angle I obtained from the manifold mounting surface sitting on a Bridgeport mill table (leveled) and using a digital level on the flange for the exhaust was 23º which in turn, means the angle on the head is 22º to a vertical line through the head ( 23 + 22 + 45) perpendicular to the head-to-block surface.
I could understand 22.5 degrees if that were the case.

This is not a big deal, I was just curious.

 

...hhmmmm.... I put a head on a level surface and read my digital level placed against the exhaust face.
I doubt that the factory would have that much tolerance and I'll ***ume that your machine shop equipment would be a notch above my non-machine shop pieces so I'll defer to your numbers.

 

In the area of manufacturing tolerances, one build on the now imploded Webrodder site they did was a build on a long tail 331. They decided to check the squareness of the block decks to the centerline of the crank. They found both decks wern't square top to bottom & front to rear, and the 2 decks were not the same distance from the centerline. Such things could cause a degree or 2, if not more, variation in degrees.

 

I wouldn't rely too much on measuring a welded exhaust flange on a welded or even cast iron exhaust manifold flange. Not a precision type of machining since gaskets will fill most variations. I'd simply put the gasket surface of the head on your known flat milling machine table and see what the digital level reads when placed on the exhaust face of the head. The exhaust manifold will be whatever 45 degrees --(minus) that reading is......if its actually vertical. Not all exhausts manifolds or headers go straight down.

 

I have had those same problems on several projects, certainly not unusual IMHO and always needs to be checked.