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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 07-21-2009   #1 (permalink)
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Default 351 Windsor head info needed

Hey guys
Fairly new to this but need some help working out my heads.
I live in Australia and have a set of reconditioned C9OE 351 windsor heads,the confusing part is they have 1.45 and 1.78 valves and all I have read says they should have bigger ones, maybe this was just an Aussie thing as the 351 windsor only came out here for a couple of years before we switched to the Cleveland.
Also they have 3/8 press in rocker studs with 5/16 threads,what rockers do I need without machining the heads.
They are going on a 302,there seems to be a heap of conflicting info on what needs to be done to fit these I have the steam holes and dfferent head stud thing worked out but pushrods are still the big question,what length do I need ?
Any help will be apprieciated as its hard to try and get this info.
Cheers
Stuart
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Unread 07-21-2009   #2 (permalink)
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Those C9OE heads should be the large valve heads. There should be 351 and WF (Windsor Foundry) cast into them. Another thing to check to see if they are 351 heads for sure is the coolant passage. On the early 351W heads, at least here in the US, the passage going into the intake should be "L" shaped. (Don't forget to get the right gaskets for this).

These heads use the "Rail" type of rocker arm and the pushrod length going on a 302 is 6.876" with a 5/16" dia. to the P/R itself.
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Unread 07-21-2009   #3 (permalink)
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Thanks They are definatly 351 heads as it is cast into them,there are also a few 4's so I guess they are 4v even though that doesn't seem to mean much with windsor heads.
They have been fully reconditioned with new valve seats so maybe they had to use smaller seats and valves for some reason.
So I should be able to use 3/8 rail rockers as long as I get the 5/16 lock nuts.
I am still wieghing up wheather to use these or stick with my 66, 289 heads for a bit more compression.as there will be not much benifet with the same size valves and a bit less compression using the 351 heads only a bit better flow.
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Unread 07-22-2009   #4 (permalink)
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The C9 heads should offer a decent compression ratio. The combustion chambers weren't opened up until later model years. As long as you use the rail rockers with your stock set up, you should be fine.

There is one more thing to do if using the 351 heads on a 302. You will need to get the step washers for the head bolts. This is to fill the gap and keep the bolts aligned because the 302 uses 7/16" head bolts, the 351, 1/2" bolts.
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Unread 07-22-2009   #5 (permalink)
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Thanks for the info any idea what the compression difference would be between the 289 heads and the 351's
We cc'd the haeds and there was about 4cc difference.
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Unread 07-22-2009   #6 (permalink)
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My references state that the C9 and D0 351 heads had 60cc chambers. The 66 289 had chambers that veried from 52 to 55cc.

The 66 289 2 barrel had a comp ratio of 9.3:1
4 barrel had 10.0:1
351W had 9.5:1

You'll have to do the math for the pistons that you have. The piston may be dished or it may have just valve reliefs. I believe that both were used and this is why there is a difference between the two engines in comparison to the combustion chambers.

My guess is that 4cc would be worth about a half a point or .5.
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Unread 07-23-2009   #7 (permalink)
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Any idea how long the heads were produced with 5/16 threads I am having a bit of trouble getting lock nuts in that size,well over here at least.
I purchased some correct lenght pushrods from the US I guess I will have to get the nuts and rockers from over there as well.
Its frustrating trying to get windsor info over here you just cant find the people who know enough about them when it comes to what will fit what.
The pushrods that were in my motor 68 302 with 66 289 heads were 6.750 long which also seems a bit of an odd size.
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Unread 07-24-2009   #8 (permalink)
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The rail rocker set up with the 5/16" nuts was used from 1966 1/2 to 1976. The nuts shouldn't be that hard to find when you consider the number of model years and the number of engines that used hydraulic lifters. Maybe you need to change the part supplier that you are using.
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Unread 07-24-2009   #9 (permalink)
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From what I can find out all the Australian windsors used 3/8 studs only heads that came in from the US had 5/16
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