727 W/ 904 internals

GTX JOHN · 05-28-2011, 04:29 AM

727 come in both small block and big block bolt patterns.......easiest way to ID
on shelf is small block is above starter the block bolt hole and starter bolt hole are directly above each other and big block starter hole is at 45 degree angle
from block bolt. Also if you measure two top bell housing holes there is a inch and a quarter width difference between big and small blocks. 904 is physically
much smaller and quite a bit shorter as well as imput shaft is smaller. There are currently available adaptor housings to mate a big block to a 904 and that
is what I use on my Bracket Cars. I do not believe that they are accepted for
stock or SS and I wish they were as it would save mucho money.

This should be way more information than anybody probably wanted......Sorry

05-28-2011, 04:29 AM	#6
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,733 Likes: 2,802 Liked 2,486 Times in 697 Posts	Re: 727 W/ 904 internals 727 come in both small block and big block bolt patterns.......easiest way to ID on shelf is small block is above starter the block bolt hole and starter bolt hole are directly above each other and big block starter hole is at 45 degree angle from block bolt. Also if you measure two top bell housing holes there is a inch and a quarter width difference between big and small blocks. 904 is physically much smaller and quite a bit shorter as well as imput shaft is smaller. There are currently available adaptor housings to mate a big block to a 904 and that is what I use on my Bracket Cars. I do not believe that they are accepted for stock or SS and I wish they were as it would save mucho money. This should be way more information than anybody probably wanted......Sorry