Motor plates

[janjon]

Does anyone know where I might find block bolt patterns, front and rear, for small block Chevy, for purposes of building engine plates? Any help appreciated.
John

[GlennLever]

Does anyone know where I might find block bolt patterns, front and rear, for small block Chevy, for purposes of building engine plates? Any help appreciated.
John

This should help get you started.
This print shows the rear of the “Small Block Chevy” block including bell housing bolt hole pattern w/dimensioning including crank centerline etc.

[wideopen231]

I use old power glide case for rear and set of threaded dead centers for front,simply screw then in and lay plate ofer them and tap with hammer.it makes perfect punh makrs fro drilling them. I guess you could do same on rear.  You can cheat and make a set in lathe or drill press,

[janjon]

Thanks so much for the help and tips, Glenn and wideop.
John

[janjon]

Might there be a similar drawing for SBC cylinder heads? Having to modify existing stud girdles to accept larger rocker nuts; there's some variation between center distances of the studs on the the heads, as measured, would be nice to know what it's "supposed to be". Any help appreciated, as always here.
John

[dreracecar]

Chevy rear dowel pins are .6200, dont mistake them for .625 (5/8"). you will need to get a chucking ream cut down to to proper size

[janjon]

Calipers confirm that you are correct, sir, as always, thanks.

[dusterdave173]

Janjon I have tried that and it is hard to make it work out--I can sell You Jomar girdles cheap that are correct for any head / valve location  Jomar makes them for everyone--if you are off just a tad it puts a strain on the stud and can mess with the lash and what not--let me know exactly what head you have and stud locations--I can drop them on your door

[janjon]

DusterDave please message me some contact info or e-mail me john@majormetals.com
Thanks