260 or 289?
#11
Ok i pulled the starter this morning and i got the numbers!
4C25
C40E-6015B
this site says its a 289
http://www.mustangtek.com/block/Block.html
4C25
C40E-6015B
this site says its a 289
http://www.mustangtek.com/block/Block.html
1963-65 260ci block w/ 7" motor mount holes. 3 freeze core plugs per side and "260" is not cast between lifter bores. 5 bolt bell.
Starting w/ 289, "289" is cast between lifter bores.
What are your head casting numbers?
#12
He said the heads had 289 cast into them I thought... Doesn't mean it's a 289 block though. 289 heads will fit right into a 260. Pretty darn similar motors unless you start comparing an early 5 bolt bell to a later 6 bolt... My money says its a 260 with 289 heads swapped in there somewhere down the line.
#17
Im not sure yet. guess ill find out when i overhaul it.
#18
BTW...I love near stock 64.5.
I would not over bore 260 block unless required; those things don't grow on trees.
My goal for 260 would be 225-250HP.
Need to port head and install large valves; 1.94/1.60 chevy valves.
Windsor Jr head would be good also.
verify compression ratio.
Check all clearances of course.
non-roller rockers.
stiffer valve springs.
stock cam.
65 GT exhaust manifolds.
dual exhaust.
tune carb.
I would not over bore 260 block unless required; those things don't grow on trees.
My goal for 260 would be 225-250HP.
Need to port head and install large valves; 1.94/1.60 chevy valves.
Windsor Jr head would be good also.
verify compression ratio.
Check all clearances of course.
non-roller rockers.
stiffer valve springs.
stock cam.
65 GT exhaust manifolds.
dual exhaust.
tune carb.
Last edited by 001mustang; 02-02-2011 at 11:25 PM.
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