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Different valves, springs and retainers and means nothing

Yes - and necessary

:CRY:
Up to a foot of snow predicted tomorrow and Monday and you have to wear a long sleeve shirt:CRY:

Geez Randy, Would I have lead him astray. Hrumff !! You must have had a hard day at the beach while the rest of the USA is suffering lousy weather.:whacked: :LOL: :LOL:

Nothing was said about roller rockers though they are a positive add on to any engine and particulaly Ford as the rail type rocker tend to cause valve guide wear with other than stock camshafts. They...

It's worth some Hp and efficiancy - but like I said, without a before and after dyno test - who knows. 5, 10 or....??

You should disassemble the heads - you scatter metal chips all over everthing...

It would depend on several factors such as carburetion, camshaft, and so on. Let's just say you can get a 'seat of the pants' increase. Hp wise, there is some. Economy wise, ditto. Total numbers -...

C90Z should actually be C90E for '69-'80 351W heads.
6049 is the base Ford part number for cylinder heads
D0OE should have a suffix C or G
The chamber size is +/-60cc
They may be factory service...

Oh well - we're getting it shipped in from the Mid West tonight and tomorrow and hope it isn't too much to stop me from going to a swap meet this weekend. Maybe the GT40s will still be available....

A little spring snow stopping a junk (oops, recycling) yard tour???:LOL: :whacked:

Dave,
They started installing them on Explorers in '97 and ran thru the 5.0L run in that SUV. And I missed a complete pair at $50 a couple of years ago.
Weather getting good? Snow is being...

There are many ok, fair and even good OEM heads available. Unfortunately, these that you have are not. 351cid D0OE-C/G, GT40Ps from Expolrer's and Expeditions to name a couple are pretty good. Then...