The Ford Barn

03-23-2005, 12:52 PM

Grind the 59 off the 59AB heads and use them. The later heads have improved cooling besides better compression.

03-23-2005, 03:24 PM

59 heads were made for 239 cu in ,the A (81A)type heads were on 221 cu in engine,Like Ron said may even be higher compression than 59 type on that engine.Check clearance on piston top &cut heads so final with compressed gasket is near .050 clearance... Check CC volume of each head and let us know which has the most volume ..

03-23-2005, 03:24 PM

59 heads were made for 239 cu in ,the A (81A)type heads were on 221 cu in engine,Like Ron said may even be higher compression than 59 type on that engine.Check clearance on piston top &cut heads so final with compressed gasket is near .050 clearance... Check CC volume of each head and let us know which has the most volume ..

03-24-2005, 10:53 AM

Ford specs from Service Bulletin dated 9-17-1947:

59A-6050-A, 77-79CC

59A-6050-B,73.5-75.5

iron 81A-(the "A" head) 77-79

8BA&8RT, 73-75

Reality may differ...

The real high compression heads were the 81S and 91S Denver heads--I think the 81 is about 60.

03-24-2005, 10:59 AM

Also, don't base anything on these numbers--there are internal inconsistencies in the list, and of course production tolerances too. Measure.

03-24-2005, 12:40 PM

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The right hand 81A head (6049 )is 2 cc's less than the left head (6050) "in theory".This was due to the different valve angle from the two sides. Haven't checked the head volume, however they are difinately not the same.

Thanks

Floyd

03-25-2005, 03:08 AM

How do you check the CC volume? I can compare by installing a 59 on one side and a 81A on the other. Perhaps, since I have the compression numbers with the 59, I can compare.

03-23-2005, 12:52 PM	#1
Guest Posts: n/a	Re: "A" heads on 59AB block Grind the 59 off the 59AB heads and use them. The later heads have improved cooling besides better compression.

03-23-2005, 03:24 PM	#2
Guest Posts: n/a	"A" heads on 59AB block;compression? 59 heads were made for 239 cu in ,the A (81A)type heads were on 221 cu in engine,Like Ron said may even be higher compression than 59 type on that engine.Check clearance on piston top &cut heads so final with compressed gasket is near .050 clearance... Check CC volume of each head and let us know which has the most volume ..

03-23-2005, 03:24 PM	#3
Guest Posts: n/a	"A" heads on 59AB block;compression? 59 heads were made for 239 cu in ,the A (81A)type heads were on 221 cu in engine,Like Ron said may even be higher compression than 59 type on that engine.Check clearance on piston top &cut heads so final with compressed gasket is near .050 clearance... Check CC volume of each head and let us know which has the most volume ..

03-24-2005, 10:53 AM	#4
Guest Posts: n/a	Re: "A" heads on 59AB block;compression Ford specs from Service Bulletin dated 9-17-1947: 59A-6050-A, 77-79CC 59A-6050-B,73.5-75.5 iron 81A-(the "A" head) 77-79 8BA&8RT, 73-75 Reality may differ... The real high compression heads were the 81S and 91S Denver heads--I think the 81 is about 60.

03-24-2005, 10:59 AM	#5
Guest Posts: n/a	Re: "A" heads on 59AB block;compression Also, don't base anything on these numbers--there are internal inconsistencies in the list, and of course production tolerances too. Measure.

03-24-2005, 12:40 PM	#6
Guest Posts: n/a	Re: "A" heads on 59AB block;compression Sponsored Links (Register now to hide all advertisements) The right hand 81A head (6049 )is 2 cc's less than the left head (6050) "in theory".This was due to the different valve angle from the two sides. Haven't checked the head volume, however they are difinately not the same. Thanks Floyd

03-25-2005, 03:08 AM	#7
Guest Posts: n/a	Re: "A" heads on 59AB block;compression How do you check the CC volume? I can compare by installing a 59 on one side and a 81A on the other. Perhaps, since I have the compression numbers with the 59, I can compare.