identifying a 200 or a 250

[Anonymous]

I tried a search and cannot find an answer i am happy with...
I run a 250ci in my Xb, this i know cause the numbers match.
However i bought another 250 and g/box, and it was from an xy ute.
it looks identical however it runs a differant fuel pump and differant colored rocker cover.
It's in healthier condition than the one fitted to the car now, but i want to ensure it's the right sized engine.

How can i be sure it's a 250 with out pulling it down?


Manifold number is- ar09de-6049-b
block number is- ardide-6015-a2 pc3800

 

[addo]

You can't be 100% sure it's not a 200! Pull out the spark plugs and look for a dished piston, or try measuring the stroke with welding wire. Otherwise, you need to invert it and pull off the sump to read the crank.

Head is actually ARC9DE-6049-B That's an XW-spec 1969 head with the later (XW/XY/XA/XB) chaped chambers. Blue rocker cover?

Block is 1971 vintage; all fuel pumps from XY-XE interchange, so no worries there.

 

[xctasy]

What addo said. First is to have a wire dopped down number one, and measure the difference is stroke by how much the wire moves during the stroke 99mm is 250, 79 mm is 200. Sadly, 200's were common, about 10-15% of XA's and XB's were bog stock 200's for fleet leases, taxis and Ford friendly government departments.


I've got a 250. It reads:-

ARC9DE-6049-B. Head should be blue Power by Ford rocker cover with vent tube, like mine.

Block number on mine reads ARIDIDE-6015-A; an early pre emission 1971 250.

On yours, the other code (A2-pc 3800) indicates its certainly a later block than mine, and that it is most likely an XB spec, 1973 to 1976 ADR 27 spec (Pollution Control 3800).

Distributor code on the advance unit of the distributor defines capacity and model. If you source the Bosch catalogue on the internet, it'll tell you what engine the distibutor came from (200's had different advance to the 250's).

 

[Anonymous]

uh cheers guys.
I'll take out a plug and see if the two 250's match.
xecute- the numbers match mine, so i am pretty sure it would be the same- 250.

thanks

 

[addo]

As I glanced on; the dished piston is usually a sign of 250-ness. The head CCs being the same, and bores identical, only way to increase compression with a 200 was to reduce volume at TDC - this was usually done with flat-topped pistons.