I don't think it's much wider than a full-on KA-T. But.. I can't find exact dimensions.
If you're thinking 302, look at the 351w. It's only a bit taller, and doesn't have a Mexican block.
Making an ultralight FBC isn't hard. But it's kinda expensive. Dart sells aluminum blocks.
http://www.dartheads.com/sbclittlem.aspx
The alum. 302 racing block
'siamese version'( no water jackets between cyl)
weighs in at 95lbs! costs$3,695.
This can be punched to a 380 cu.in
w/a stroker crank- you are in the 400+hp league.........
The alum. 351 racing block weighs in at 110lbs $3,695.
this can opened to 427cu.in w/stroker crank -upwards
of 500+hp!.
all aluminum racing heads w/rollers and complete
w/valves weigh 27lbs @ at$625.@
alum flywheel available also add approx 29lbs.
the crank will weigh in approx 43lbs.
pistons/rods etc - ~40lbs.
alum intake 17lbs, 4bl carb, headers, cam, water pump, damper, distributor, etc under 75lbs.
You would definitely be under 400lbs and be 400+ hp
Or, I think a better option would be a Lexus V8.
http://cgi.ebay.com/ebaymotors/ws/eB...sPageName=WDVW
There it is in a 2nd gen rx-7 (random internet pic, so I can't verify anything on it).
But at 300hp @ 6000rpm and 310tq @ 4000rpm, it's a helluva motor.
Before shooting down that idea, spend a few minutes on
http://lextreme.com/forums/index.php? and read about the Lexus v8s. Aluminum blocks, so once it's crammed down in the bay, you're solid.
Other crazy swaps, I helped Secret Services mock up motormounts and stuff a VQ35DE in a s13. Talk was happening that the VH 8-cyl line wouldn't take much more to fit in there...
-Jeff