I just aquired a '427 computer with the "BMHM" code. I cant seem to find BMHM listed anywhere. I dont know what it came out of at all, I assume it was a 94-95 pickup of course, but thats all I know.
Any help greatly appreciated.

 

That appears to be using the $31 mask (upgradable with G1 adaptor) and was for the L03/305 w/ 4L60-E. If thats so, then its a direct swap for your current ECM with changes to the calibration when a 700-R4, TH400, etc. is in use. It also supports MPFI/TPI with the proper changes to the memcal to select the right injector firing mode.

 

okay, I have as well determined that it is a $31. However I am not 100% sure about what engine it was for. I downloaded a BMHM bin from diy-efi and also have the "305BMHM" one ( I think I got it from moates.net).

The "305BMHM" bin I suspect has been modified for a 305. The cyl volume is set to 618.63cc and the injector flow is 75.93 in tunerpro with the $31 XDF.

The BMHM from Diy-Efi has the cylinder volume set at 923.46cc with the injector flow setting at 67.89.

i have not read mine yet, but will do so in the next few days. I am already happy to have found a real V8 calpak (a rare thing at a pick-ur-part) and am even more excited at the possibility of it having the right big block ESC unit. My project is a 496 big block powered 51 chevy pickup, and if I can find one it'll have a 4L80E.

"It also supports MPFI/TPI with the proper changes to the memcal to select the right injector firing mode."
Yes, this is why I'm looking at using the '427, it will do almost anything it seems. This setup will be using a tunnel ram intake with injector bungs welded in and probably a couple of gutted holley carbs on top as throttlebodies. I got all the hood clearence in the world, no need to try to change it to a front draft TB like the current trend.