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Old 07-01-2018, 09:52 PM   #1
Fordestes
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Default 41Theads on a 4"stroke x 3.125

I recently snagged a set of N.O.S heads for a 41T engine , I done the search on here and turned up nothing, I may not have my facts straight ,but as I remember my late father talking about using 41T heads on a stock car to boost compression . anybody here have any input on the matter ?Thanks ,Fordestes
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Old 07-01-2018, 10:54 PM   #2
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Default Re: 41Theads on a 4"stroke x 3.125

According to a chart I found online, 41T heads have a volume of 62 cc's. On a 3.125" X 4" engine it gives a compression ratio of8.03 to 1.
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Old 07-02-2018, 06:45 AM   #3
jimTN
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Default Re: 41Theads on a 4"stroke x 3.125

If they are the heads I think they are, they look like they are filled. We tried them on a race car back in the 60s . No great results and a lot of heating.
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Old 07-02-2018, 09:54 AM   #4
Fordestes
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Default Re: 41Theads on a 4"stroke x 3.125

I never had very good results by using filled heads , when we were kids we tried filling a set of mercury heads , when we needed transportation the most the fill material fell out and wiped out the engine. the aftermarket had compression increasers that one could weld in place , we used plain old brazing rod instead, I still have one compression increaser I found a while back, just a picture from days gone by .
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Old 07-09-2018, 12:00 PM   #5
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Default Re: 41Theads on a 4"stroke x 3.125

Back up the bus a bit! I dug out my burette and 41T head I have and measured a chamber. it came out to 84.5 cc's! So much for that online chart!
I had set these 41T heads aside years ago because I thought the chambers looked awfully deep. They might breathe a little better at high RPM, but compression? Forget about it!
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Old 07-09-2018, 12:38 PM   #6
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Default Re: 41Theads on a 4"stroke x 3.125

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I am going to dig out my burret and see if these are what the online chart says, they look similar to a 59 a head as far as the chamber over the piston. I looked at many war surplus heads and the 81T, 81 A and 99T , the chamber over the piston is farther away from the centering point ,same as 59 a. design and the valve pockets have a lower area over the exhaust side and higher over the intake side, and these are definitely New old stock and not filled. Ill try and get this done today and let you know what I find, if they are not the 62 cc chamber I can always use them on another engine , I was trying to avoid spending 800 plus dollars for the aluminum aftermarket heads.one of these have a casting flaw that I hope will not cause a problem, I am still looking for one more 41 T head to make a set for another project.
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Old 07-09-2018, 04:34 PM   #7
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Default Re: 41Theads on a 4"stroke x 3.125

The 59AB heads are the best for cooling and compression IMHO.
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Old 07-09-2018, 06:09 PM   #8
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Default Re: 41Theads on a 4"stroke x 3.125

Here is the Ford chart. I think the 81AS heads are the ones you need for higher compression?
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