I have been told that the block on my engine has crack between
cylinders 1 and 2 and 3 and 4.
So it looks like a new engine for me. Fortunately the insurance
company has come to the party as it resulted from my recent
incident.
The question…get to the point Stephen…is what impact would a non
matching numbers engine have the value of my car…
Should I keep the car as a Alloy cam covered engine or go to a XJ6
Series III head?–
Stephen 67 Series 1 2+2
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Stephen Pierce sent Fri 12 Dec 2003:
Stephen,
I see no reason to change cylinder heads. Just bolt the existing
head to the new SIII XJ6 block.
The other option is to use both the top and bottom end of the XJ6
motor. The XJ6 head will have larger intake valves. The XJ6 block
has better cooling characteristics. You can still use your alloy
cam covers.
If you decide to use the XJ6 head, switch to OM needles for your
SU’s. This is a slightly richer needle more suitable to the larger
valves.
Matching numbers are of minimal value in the long run.
Best Regards,
Eric
66fhc–
The original message included these comments:
The question…get to the point Stephen…is what impact would a non
matching numbers engine have the value of my car…
Should I keep the car as a Alloy cam covered engine or go to a XJ6
Series III head?
–
Eric Scott Williams 66fhc (the Thunderbolt GreaseSlapper!)
Sylmar, CA, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Eric-the-Bastard sent Sat 13 Dec 2003:
Eric,
Ummmm, there’s no such thing as OM needles. The stock needles
are UMs. I think you meant UO, which is the next richer, and is
the proper needle for a big-valve head. UO’s are available from
Terry’s for about $8 each.–
The original message included these comments:
If you decide to use the XJ6 head, switch to OM needles for your
SU’s. This is a slightly richer needle more suitable to the larger
valves.
Best Regards,
Eric
–
Ray Livingston - '64 OTS Santa Cruz, CA
Santa Cruz, CA, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Stephen Pierce sent Fri 12 Dec 2003:
In the long run, I think it doesn’t make any difference - there are
too many other variables.
I had the same problem, cracked block. I reinstalled the original
head and since the head number is on the data plate for all
practical purposes the numbers match.
Let’s be wary of what happened in the Corvette hobby where matching
numbers is the end all and be all. I’ll bet there are more number
matching big block 67’s than ever were built by the factory.
Let’s drive 'em and enjoy 'em. Things break, we fix and drive some
more.–
Gary Herzberg 66 ots, 98 xk8
Bozeman, MT, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Stephen Pierce sent Sat 13 Dec 2003:
Make life easy - pick up a complete S3 engine. Head and block
matched extra water passages plus good water pump, the best cams,
rods, valves, block stiffeners, 2-wire electronic ignition, oil
cooler, full size spin on filter - all Jag and all for UK
equivalent of 250 dollars (see me smiling?
I’ve looked (briefly, before I came over) for air injection
passages but no sign I could see. Where are they? In the head
itself on the exhaust side so you have to look inside the port?
Maybe the anti smog air pump wasn’t fitted to UK 84 XJ6 S3 cars.
Will have to check.–
Peter Crespin 94 X300 Daimler / 66 2+2 ‘E’
Buxton, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Peter Crespin sent Sat 13 Dec 2003:
Peter:
I don’t have a clue if non-US (or non-North American) cars
had them or not but the air injection ports people refer to
to identify XJ S3 engines are located in the center of the
head where the acorn head nuts and spark plugs are located.
There is actually an air rail that runs down the center
valley of the head connecting them all to the incoming air
from the air pump. The inlet for this air rail arches up
over the center of the exhaust cam cover with a large valve
connected with hoses on either side which leads to the pipe
coming from the back of the air pump. The air pump sits high
on the exhaust side of the engine driven by a belt.–
The original message included these comments:
I’ve looked (briefly, before I came over) for air injection
passages but no sign I could see. Where are they? In the head
itself on the exhaust side so you have to look inside the port?
Maybe the anti smog air pump wasn’t fitted to UK 84 XJ6 S3 cars.
Will have to check.
Peter Crespin 94 X300 Daimler / 66 2+2 ‘E’
–
Steven A. DuChene - XJ6VDP XJ6C XJ12C XK120SE 3.8S E-Types
Reston, VA, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from StevenD57 sent Sun 14 Dec 2003:
I wonder why they did the air injection into the head itself,
rather than into the exhaust manifold, which is more conventional?–
The original message included these comments:
Peter:
I don’t have a clue if non-US (or non-North American) cars
had them or not but the air injection ports people refer to
to identify XJ S3 engines are located in the center of the
head where the acorn head nuts and spark plugs are located.
–
Ray Livingston - '64 OTS Santa Cruz, CA
Santa Cruz, CA, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from StevenD57 sent Sun 14 Dec 2003:
Thanks Steve. Even allowing for the fact that there were some
ancillaries already removed, I didn’t see anything like that in the
valley. Sounds like I may have an unmolested enigne, thankfully.–
Peter Crespin 94 X300 Daimler / 66 2+2 ‘E’
Buxton, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Peter Crespin sent Sun 14 Dec 2003:
Yes but since they (the holes in the head or the air rail
itself) weren’t there you may not have an engine with the
larger valves either. I guess there is only one sure way to
know.–
The original message included these comments:
Thanks Steve. Even allowing for the fact that there were some
ancillaries already removed, I didn’t see anything like that in the
valley. Sounds like I may have an unmolested enigne, thankfully.
Peter Crespin 94 X300 Daimler / 66 2+2 ‘E’
–
Steven A. DuChene - XJ6VDP XJ6C XJ12C XK120SE 3.8S E-Types
Reston, VA, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from StevenD57 sent Sun 14 Dec 2003:
No probs I’m sure. The big valves came in with the EFI and this
definitely has EFI and I have seen the donor S3 XJ car. Have only
looked at it for a few minutes since I got the engine home the
night before I came to the US but I’m pretty sure I have a non-air
injection motor. Will post if different of course.
In fact I have a spare S3 head come to think of it, collected a few
days earlier, and that has no holes in it either but I didn’t know
to expect them in the valley so I didn’t remark on its ‘normal’
appearance until your info earlier.–
Peter Crespin 94 X300 Daimler / 66 2+2 ‘E’
Buxton, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
