The Ford Barn

old Tom · 05-09-2010, 11:59 AM

Is it possible to bore a 59AB block out to the water jackets,install sleeves and than rebore to 3 7 /16 or even 3 1/2. If that was coupled with a 4 1/2 crank you would come up with some ci that shouldproduce quite a bit of HP.

bobscogin · 05-09-2010, 12:39 PM

Quote:

Originally Posted by old Tom

Is it possible to bore a 59AB block out to the water jackets,install sleeves and than rebore to 3 7 /16 or even 3 1/2. If that was coupled with a 4 1/2 crank you would come up with some ci that shouldproduce quite a bit of HP.

There's less expensive ways to make scrap iron.

Bob

flatjack9 · 05-09-2010, 12:43 PM

I don't know about horsepower, but it should have a ton of torque. You would need to do some very serious porting work to adequately fill those cylinders. Also would need to keep the rpm's below 5000. You would also need to do some trimming inside the block to swing that big arm.

Pete · 05-09-2010, 01:29 PM

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Yes, it was done many times in the old days..Back then 1/2 inch cranks were about the most that was available for a price you could afford.
1/2 by 7/16 gave you 315 ci...Now days you can get any stroke you are clever enough to fit in the crankcase....A better solution now is to first off, use an 8ba block. They generally will stand slightly bigger bores safely..3 3/8 plus .030 is a safe limit leaving enough for a couple cleanups..This does not require sleeves..It is definetly recommended to have the block sonic checked first.
I am currently collecting parts for a 346 ci flathead...This will have a one inch crank. RPM limits are not the factor they were in the old days what with modern forged pistons, H beam rods and titanium valves.
Our last engine (323 ci) would turn 7000 twice a lap all day if need be.
Head gaskets are not the problem they were with big bores in the old days either..We have modern O-ring technology that the overhead engines have been using for years.

05-09-2010, 11:59 AM	#1
old Tom Senior Member Join Date: May 2010 Posts: 201	59AB block Is it possible to bore a 59AB block out to the water jackets,install sleeves and than rebore to 3 7 /16 or even 3 1/2. If that was coupled with a 4 1/2 crank you would come up with some ci that shouldproduce quite a bit of HP.

05-09-2010, 12:43 PM	#3
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,608	Re: 59AB block I don't know about horsepower, but it should have a ton of torque. You would need to do some very serious porting work to adequately fill those cylinders. Also would need to keep the rpm's below 5000. You would also need to do some trimming inside the block to swing that big arm.

05-09-2010, 01:29 PM	#4
Pete BANNED Join Date: May 2010 Location: Wa. Posts: 5,423	Re: 59AB block Sponsored Links (Register now to hide all advertisements) Yes, it was done many times in the old days..Back then 1/2 inch cranks were about the most that was available for a price you could afford. 1/2 by 7/16 gave you 315 ci...Now days you can get any stroke you are clever enough to fit in the crankcase....A better solution now is to first off, use an 8ba block. They generally will stand slightly bigger bores safely..3 3/8 plus .030 is a safe limit leaving enough for a couple cleanups..This does not require sleeves..It is definetly recommended to have the block sonic checked first. I am currently collecting parts for a 346 ci flathead...This will have a one inch crank. RPM limits are not the factor they were in the old days what with modern forged pistons, H beam rods and titanium valves. Our last engine (323 ci) would turn 7000 twice a lap all day if need be. Head gaskets are not the problem they were with big bores in the old days either..We have modern O-ring technology that the overhead engines have been using for years.