The Ford Barn

4tford · 01-26-2015, 08:14 PM

I ended up with three of these blocks this summer. (all are .045 over bore) Completed this one today. 99 USA block factory relieved. Heads are Canadian Aluminum 91A. Did the aluminum peas and the tightest spot was .053 Gasket is .059 and I assume when compressed it is .050. That means my tightest spot over a piston will be .044. Had to mill the block .012 due to a gouge. Now I am wondering if one of these intakes would happen to be the right one to go with this setup. Thanks Bill

flatjack9 · 01-26-2015, 10:43 PM

I'd say the middle one.

Lawrie · 01-27-2015, 01:48 AM

I have a 99a in my 33 at the moment,4 inch crank and .040 over bore,I used the 33/34 manifold and 97 carb, that engine has a pile of torque and is so nice to drive.
I know it could do with a bigger carb ,but where I do most of my driving it is very nice.
lawrie

Walt Dupont--Me. · 01-27-2015, 09:35 AM

Quote:

Originally Posted by 4tford

I ended up with three of these blocks this summer. (all are .045 over bore) Completed this one today. 99 USA block factory relieved. Heads are Canadian Aluminum 91A. Did the aluminum peas and the tightest spot was .053 Gasket is .059 and I assume when compressed it is .050. That means my tightest spot over a piston will be .044. Had to mill the block .012 due to a gouge. Now I am wondering if one of these intakes would happen to be the right one to go with this setup. Thanks Bill

Looks to me like that manifold on the right might flow more air, looks like it takes the long push rod 8-7/8. I don't like that one on the left with the heat riser hole, I've seen to many of them burned out. Walt

G32 · 01-27-2015, 09:41 AM

Bill,
The cast in raised 99 on the right deck
makes that a Canadian block, doesn't it?
US 99 had only a stamping on intake surface
1939/1940, if any.
Does the flat intake surface date the block
39/40 as opposed to 41/42 (so called raised)
as US blocks.
Yours came from 1942?-- or is set up for
crab distributor.
Interesting variety of intakes---1939 or
earlier?
Nice build!
Gene Tulsa

42panel · 01-27-2015, 12:44 PM

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Nice looking block. I also have a 99 Mercury block but unlike you I have the 99A aluminum heads that came with it. Could anyone explain to me the difference between the 91A and 99A aluminum heads for this engine?

bobH · 01-27-2015, 12:59 PM

Quote:

Originally Posted by 42panel

Nice looking block. I also have a 99 Mercury block but unlike you I have the 99A aluminum heads that came with it. Could anyone explain to me the difference between the 91A and 99A aluminum heads for this engine?

I can't explain the difference in the heads, but I can say the '1' in 91A makes it a Ford part number, and the second '9' in 99A makes it a Mercury part number

flatjack9 · 01-27-2015, 01:15 PM

My guess is that the combustion chamber would be a little larger. Since the engine is bigger, the chamber would be larger to keep a similar compression ratio.

flatjack9 · 01-27-2015, 01:17 PM

The manifold on the right looks to be a 34 or early 35 manifold.

42panel · 01-27-2015, 04:33 PM

Bobh, Thank you for that information.

01-26-2015, 08:14 PM	#1
4tford Senior Member Join Date: May 2010 Location: Regina Canada Posts: 1,335	99 Merc block done I ended up with three of these blocks this summer. (all are .045 over bore) Completed this one today. 99 USA block factory relieved. Heads are Canadian Aluminum 91A. Did the aluminum peas and the tightest spot was .053 Gasket is .059 and I assume when compressed it is .050. That means my tightest spot over a piston will be .044. Had to mill the block .012 due to a gouge. Now I am wondering if one of these intakes would happen to be the right one to go with this setup. Thanks Bill Last edited by 4tford; 08-05-2020 at 08:02 AM.

01-26-2015, 10:43 PM	#2
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,526	Re: 99 Merc block done I'd say the middle one.

01-27-2015, 01:48 AM	#3
Lawrie Senior Member Join Date: May 2010 Location: Qld, Australia Posts: 4,212	Re: 99 Merc block done I have a 99a in my 33 at the moment,4 inch crank and .040 over bore,I used the 33/34 manifold and 97 carb, that engine has a pile of torque and is so nice to drive. I know it could do with a bigger carb ,but where I do most of my driving it is very nice. lawrie

01-27-2015, 09:41 AM	#5
G32 Senior Member Join Date: May 2010 Posts: 258	Re: 99 Merc block done Bill, The cast in raised 99 on the right deck makes that a Canadian block, doesn't it? US 99 had only a stamping on intake surface 1939/1940, if any. Does the flat intake surface date the block 39/40 as opposed to 41/42 (so called raised) as US blocks. Yours came from 1942?-- or is set up for crab distributor. Interesting variety of intakes---1939 or earlier? Nice build! Gene Tulsa

01-27-2015, 12:44 PM	#6
42panel Senior Member Join Date: May 2010 Location: Andover CT Posts: 101	Re: 99 Merc block done Sponsored Links (Register now to hide all advertisements) Nice looking block. I also have a 99 Mercury block but unlike you I have the 99A aluminum heads that came with it. Could anyone explain to me the difference between the 91A and 99A aluminum heads for this engine?

01-27-2015, 01:15 PM	#8
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,526	Re: 99 Merc block done My guess is that the combustion chamber would be a little larger. Since the engine is bigger, the chamber would be larger to keep a similar compression ratio.

01-27-2015, 01:17 PM	#9
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,526	Re: 99 Merc block done The manifold on the right looks to be a 34 or early 35 manifold.

01-27-2015, 04:33 PM	#10
42panel Senior Member Join Date: May 2010 Location: Andover CT Posts: 101	Re: 99 Merc block done Bobh, Thank you for that information.