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Anonymous
Guest
do i remember reading that one cheap way to upgrade valve springs is to use the springs for a 289?
Howdy DJL26:
I don't know about cheap. The '66 1/2 to '68 1/2 springs, FoMoCo part# C6A6513-A have the same dimensions as the stock OEM 200/250 springs.
A NAPA # is 212-1165.
The stock OEM late model 200/250 springs are rated at 150 closed and 54 open.
THe 289/302 springs are rated at 175 closed and 60 open.
The other parts swap option is the exhaust spring from '73 - '75 302. These are rated at 200 open and 80 closed. The NAPA number is 212-1059. I don't have a FoMoCo part #. Even though these are exhaust valve specific, we use them on both intake and exhaust. The spring doesn't know the difference.
While you're at it consider lightening the load on the springs with lighter weight, one piece retainers. Early 260 V8s used the same smaller stem valves as the 200/250 and the retainers weigh 24 grams as compared to 30 grams for the 2 piece 200/250s. The FoMoCo part #C3 428514-B. They have been out of production for some time, but you may get lucky. The 4.0 V6 retainers weigh in at 23 gms and have a current FoMoCo part number #E6TZ 64536-A.
New and through the FoMoCo parts window or other parts houses these items are not cheap. If you have more time than money, have access to a recycle yard and don't mind messing with used stuff, glean away. Know that used springs should be pressure checked to varify condition. One piece retainers are a good recycle bet.
Adios, David
I don't know about cheap. The '66 1/2 to '68 1/2 springs, FoMoCo part# C6A6513-A have the same dimensions as the stock OEM 200/250 springs.
A NAPA # is 212-1165.
The stock OEM late model 200/250 springs are rated at 150 closed and 54 open.
THe 289/302 springs are rated at 175 closed and 60 open.
The other parts swap option is the exhaust spring from '73 - '75 302. These are rated at 200 open and 80 closed. The NAPA number is 212-1059. I don't have a FoMoCo part #. Even though these are exhaust valve specific, we use them on both intake and exhaust. The spring doesn't know the difference.
While you're at it consider lightening the load on the springs with lighter weight, one piece retainers. Early 260 V8s used the same smaller stem valves as the 200/250 and the retainers weigh 24 grams as compared to 30 grams for the 2 piece 200/250s. The FoMoCo part #C3 428514-B. They have been out of production for some time, but you may get lucky. The 4.0 V6 retainers weigh in at 23 gms and have a current FoMoCo part number #E6TZ 64536-A.
New and through the FoMoCo parts window or other parts houses these items are not cheap. If you have more time than money, have access to a recycle yard and don't mind messing with used stuff, glean away. Know that used springs should be pressure checked to varify condition. One piece retainers are a good recycle bet.
Adios, David
David, great info but I just tried that (212-1059) part number for the 73-75 ford exhaust spring and could not find a matching part number (NAPAonline.com)? I'm looking for a swap option such as you have stated, looking for a 80 lb closed spring that can replace the stock spring without doing any other mods to make them fit.
Thanks David, could you post here for others and PM me as to the current parts number? With this supercharger it can run the rmp up very fast and valve float is not good. 
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Anonymous
Guest
just remove that dash from the part number and it works. they are $2.50 each.
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Anonymous
Guest
oh, does anyone know what the closed height should be on the valve stem?
Thanks for the info I just removed the dash and found the parts online at NAPA and ordered them, man I love the internet!
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Anonymous
Guest
a little more clarification please...for a green-horn
I may need to change out the springs as well. When I rebuild the head, I used the stock springs and had them shimmed but it looks like I may have some valve float.
Based on the specs in my sig below, which of the "stock" springs for other valves should I use on my OZ250 with original sized OZ valves? i want to be able to replace these springs without removing the head for machining.
Thanks all!
I may need to change out the springs as well. When I rebuild the head, I used the stock springs and had them shimmed but it looks like I may have some valve float.
Based on the specs in my sig below, which of the "stock" springs for other valves should I use on my OZ250 with original sized OZ valves? i want to be able to replace these springs without removing the head for machining.
Thanks all!
From recent experiance I can tell you that you need to check what the original size springs were in your Aussie head and select one with more pressure that is within the spec's of the Aussie, I think Addo posted above that the Aussie 2V springs are 1.575" and not 1.59" as the American log head is using. I just ordered and installed the NAPA part number posted above and my mechanic (guy with the valve tools) messured them at 1.625
I don't know if someone at NAPA changed the part number or an error was made but the ones I got were longer and based on Addo's spec's those of us with Aussie 2v heads should be very carefull trying to use American valve train parts on these Aussie 2v heads.
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Anonymous
Guest
fortunately, I'm not using ANY american valve train parts! 
Not yet anyway.
The problem with measuring the existing springs is they are probably worn and compressed...no? That's not going to give me an accurate starting point.
Not yet anyway.The problem with measuring the existing springs is they are probably worn and compressed...no? That's not going to give me an accurate starting point.
63tardrop,
That's what I said be carefull , it's up to you and no one else to make sure you install parts on your Aussie 2v head that not only work and improve the performance but also don't cause it to kill your engine!
That's what I said be carefull , it's up to you and no one else to make sure you install parts on your Aussie 2v head that not only work and improve the performance but also don't cause it to kill your engine!
