Are the 7A head and the 3b head the same? without the cams offcourse.
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Audi S4 avant
Audi S2 coupe
x-Dodge Ram 3500 Big Duley
x-Audi A4 TQ
x-Audi S4 sedan
x-Audi S2 coupe -
Water manifold below IM is different, can be machined to take turbo water manifold, I believe exhaust valve are different ( sodium filled on 3B). The rest pretty much the sameAelred -
7A also has sodium filled valves. The only difference is the water manifold, and the 7A only has 2 studs per exhaust port.Mark Siggelkow
'90 CQ 20vT - NASA GTS-5 (R.I.P.)
'90 CQ-R - NASA GTS-4/5
'00 A4 1.8TQMS (Wife's Daily Driver)
'12 TT-RS (Wife's new DD, on order for May European delivery)
'62 Porsche 356B (another race car)
'03 Kawasaki Z1000 (toy)Comment
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Not all of them, i have a 7a head and the studs are the same as the S2, seen a few like this.Originally posted by RSCoupeComment
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I have 2 7A heads and they have the same studs as the ABY.
I also thought the 7A valves were sodium filledS2,RS2,S4 WB,RS4,S4 B8,RS6 C5,RS6 C6,R8Comment
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They are, i cut one in half and threw it in a bucket of water to seeOriginally posted by Doug_RS2
Thats how you are supposed to dispose of them.Comment
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i bent 10 of them, was that not the proper way to dispose of em?!
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So...it appears that the 7A head can be used with just the machining for the water manifold. I have one with all the studs, like the 3B/ABY. I would like to get a nice valve job done prior to removing the head off my 3B, but I'd been concerned about the valves because they have a different part number. They are definately sodium filled, so what's the difference? Is anyone running a complete 7A head with high HP??91 Modded 3B
14 A6 Avant Black EditionComment
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lol, of course, but i mean before chucking them in the bin.Comment
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Sodium valves aren't meant for Turbo cars, because they conduct heat better than a standard valve they in general require that the head requires extra cooling!Comment
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Did those heads have the cast manifold? Both of mine had the tubular manifold.Originally posted by martinjs
Learn something new every day...
Mark Siggelkow
'90 CQ 20vT - NASA GTS-5 (R.I.P.)
'90 CQ-R - NASA GTS-4/5
'00 A4 1.8TQMS (Wife's Daily Driver)
'12 TT-RS (Wife's new DD, on order for May European delivery)
'62 Porsche 356B (another race car)
'03 Kawasaki Z1000 (toy)Comment
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Not sure which manifold they had, thats maybe why they are different then.Comment
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Cast manifold on the one I had.91 Modded 3B
14 A6 Avant Black EditionComment
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I was wrong - just checked - the ones with the cast exhaust manifold have all the studs. The ones with the tubular manifold have 2 studs per port. A bit more machining required on the tubular manifold heads then.
Tubular:S2,RS2,S4 WB,RS4,S4 B8,RS6 C5,RS6 C6,R8Comment
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And Cast:S2,RS2,S4 WB,RS4,S4 B8,RS6 C5,RS6 C6,R8Comment
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