41 mercury engine question

fortyfords

fortyfords

Senior Member
I have looked at Van Pelt's web site and any other sites that related to this subject. 1941 Mercury engines should have 19A on the heads, was there any chance that the 19 could be left off and just an A shows? Or does the A say what year or make the engine is, engine appears blue?
 
There are heads that just have an A on them. They are compatible with the earlier motors with the valves closer to the cylinders. If I remember correctly they have a relatively small combustion chamber and can offer an increase in compression ratio. They might give valve clearance problems if used on a 59 type motor unless the valve picket area is relieved.
Try looking along the top edge just above the deck face. Sometimes there is a part number cast in along there.
Mart.
 
Yes, a very good chance the heads just have a Large "A" cast in the centers. The original engine would be blue. There may be a small "99" stamped in the right front top of the block between the intake manifold and the cylinder head.

Terry
 
The large "A" heads were 81A heads and they were used on the early Mercury 99A engines till Ford made purpose build heads for them. The 81A heads have a higher compression ratio than Mercury specific heads do. There is a cylinder head chart in the Green Bible chassis parts catalog that gives a pretty good run down of the heads for early V8s. The 1940 and 41 Mercury would have had the 99T prefix heads that all the 95 HP engines had. The 29A heads came out in 42 but they were short lived due to the war. My 1938 through 41 chassis parts catalog lists what fit what in those years. They never made a 19A prefix head that I'm aware of.
 
rotorwrench said:
The large "A" heads were 81A heads and they were used on the early Mercury 99A engines till Ford BUT


I know this is an old post but found doing research!!!!

Sorry but early Mercury and later through 41 used the 81T heads!!! NOT 81A's see pictures!!! V8 Times circa 1984!!
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rockfla said:
rotorwrench said:
The large "A" heads were 81A heads and they were used on the early Mercury 99A engines till Ford BUT


I know this is an old post but found doing research!!!!

Sorry but early Mercury and later through 41 used the 81T heads!!! NOT 81A's see pictures!!! V8 Times circa 1984!!
Click to expand...

Correct. T heads had a slightly lower compression ratio that the A heads.
At least 39 - 41 Mercs used the T heads.
Click to expand...
 
recently bought a 40 Mercury Coupe from a friend and fellow Fordbarner. Heads are 81T and 99 is stamped on the front rail between the intake and head on the passenger side front of motor.
 
All 41 Merc had 81A heads per original examples. Also all 41 Merc engines were painted Ford green. I have confirmed this by low milage 30K cars and by Ford paperwork.
 
squirefd said:
All 41 Merc had 81A heads per original examples. Also all 41 Merc engines were painted Ford green. I have confirmed this by low milage 30K cars and by Ford paperwork.
Click to expand...

Green? Correct.
81A heads, incorrect.
A 30,000-mile car is not necessarily a good example of what left the factory.
 
The heads should have an "A" on them and have 81A part numbers on the top edge of the heads. The engine color is Ford been. Anything other than that is wrong. This has been officially verified by looking at 30k mile all original 41 Mercurys and by researching Ford factory documents. This is from 50 years of research.
 
squirefd said:
The heads should have an "A" on them and have 81A part numbers on the top edge of the heads. The engine color is Ford been. Anything other than that is wrong. This has been officially verified by looking at 30k mile all original 41 Mercurys and by researching Ford factory documents. This is from 50 years of research.[/QUOT

WITH ALL THAT RESEARCH, FIFTY YEARS WORTH, IT SHOULD BE SIMPLE / EASY TO POST THE FACTORY ENGINEERING REALEASE OR OTHER SUPPORTING DOCUMENTATION.
A 30,000 MILE CAR, AS I STATED EARLIER, IS NOT RELIABLE "EVIDENCE" OF ANYTHING.
UNTIL SUCH DOCUMENTATION IS PRESENTED, 81A HEADS ON A '41 MERCURY WILL RESULT IN A POINT DEDUCTION.
Click to expand...
 
1941 Mercury only used 81A heads. Some earlier Mercurys used 81T heads. Remember there are right and left heads. 6049 and 6050.
 
81A heads are verified from several original Ford factory documents. The green engine is also documented. Blue was not used on the Mercury engines until 1942.
 
squirefd said:
81A heads are verified from several original Ford factory documents. The green engine is also documented. Blue was not used on the Mercury engines until 1942.
Click to expand...

I am eager to see your documentation in regard to the heads.
 
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