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Discussion Starter · #1 ·
Thanks to all who responded to my 1/28 post about needing advice related to a suspected blown headgasket in my '73. I took the head to a machine shop and found out late lasy Friday that it has a hole in it. I won't know if it can be welded till Monday. That brings me to my big question. If my E88 head can't or shouldn't be welded, I will need a new head. I have a complete '77 Z engine I bought from a guy doing a chevy conversion a couple of years ago, it's never been apart. What types of problems will I run into if I use that N47 head on my 240 block. I'm running twin weber DGV's and the Motorsport Auto 3 into 2 header. I know that the intake ports on the head will be round with the little notches cut for the fuel injection and I believe that the N47 has the sleeves in the exhaust passages. Are these things problems? what about performance or anything else? thanks.
 

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Discussion Starter · #3 ·
Re: 1/28 needed advice real bad-got it, more quest

> Were was the hole,and maybe it might be better
to find a good head at the junkyard. I would not
risk it. I heard people welding cracks but not holes. The N47 were design for dished pistons
not flat top pistons. Your 73 block has flat
top pistons. You can swap engines but you might
have to buy new headers what I heard headers
are not useful until you have over 200 HP.
I read you have weber dgv can you tell me how
they perform and were they better then the SUs
carbs.

Thanks to all who responded to my 1/28 post
> about needing advice related to a suspected
> blown headgasket in my '73. I took the head
> to a machine shop and found out late lasy
> Friday that it has a hole in it. I won't
> know if it can be welded till Monday. That
> brings me to my big question. If my E88 head
> can't or shouldn't be welded, I will need a
> new head. I have a complete '77 Z engine I
> bought from a guy doing a chevy conversion a
> couple of years ago, it's never been apart.
> What types of problems will I run into if I
> use that N47 head on my 240 block. I'm
> running twin weber DGV's and the Motorsport
> Auto 3 into 2 header. I know that the intake
> ports on the head will be round with the
> little notches cut for the fuel injection
> and I believe that the N47 has the sleeves
> in the exhaust passages. Are these things
> problems? what about performance or anything
> else? thanks.
 

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My tips/suggestions...

> Thanks to all who responded to my 1/28 post
> about needing advice related to a suspected
> blown headgasket in my '73. I took the head
> to a machine shop and found out late lasy
> Friday that it has a hole in it. I won't
> know if it can be welded till Monday. That
> brings me to my big question. If my E88 head
> can't or shouldn't be welded, I will need a
> new head. I have a complete '77 Z engine I
> bought from a guy doing a chevy conversion a
> couple of years ago, it's never been apart.

Why not just swap in the entire L28, if it's in good condition??

> What types of problems will I run into if I
> use that N47 head on my 240 block.

Well, c.r. should be about the same, as the chamber cc's between E88 and N47 are almost identical. Assuming there has been no machining done. It will bolt right up, no problems whatsoever.

> I'm running twin weber DGV's and the Motorsport
> Auto 3 into 2 header. I know that the intake
> ports on the head will be round with the
> little notches cut for the fuel injection
> and I believe that the N47 has the sleeves
> in the exhaust passages. Are these things
> problems?

You might have exhaust leakage. Your manifold is for your 240 right?? If so, it was designed for a SQUARE exhaust head. The N47 is round. This means that you won't have the best seal, and it will be prone to leakage. The sleeves are notorious for causing a restriction, but no other problems. The notches for the injectors shouldn't cause any problems either. You'll have to use the manifold gasket designed for the N47. One side benefit, is that the N47 has larger valves 44int, 35exh compared to 42mm int/33mm exh for the E88.
My advice would be to use this head temporarily, until you can find a square exhaust head that is in decent shape, or have one rebuilt.
 

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Discussion Starter · #5 ·
Re: 1/28 Thanks again Everyone

> Thanks to all who responded to my 1/28 post
> about needing advice related to a suspected
> blown headgasket in my '73. I took the head
> to a machine shop and found out late lasy
> Friday that it has a hole in it. I won't
> know if it can be welded till Monday. That
> brings me to my big question. If my E88 head
> can't or shouldn't be welded, I will need a
> new head. I have a complete '77 Z engine I
> bought from a guy doing a chevy conversion a
> couple of years ago, it's never been apart.
> What types of problems will I run into if I
> use that N47 head on my 240 block. I'm
> running twin weber DGV's and the Motorsport
> Auto 3 into 2 header. I know that the intake
> ports on the head will be round with the
> little notches cut for the fuel injection
> and I believe that the N47 has the sleeves
> in the exhaust passages. Are these things
> problems? what about performance or anything
> else? thanks.

I found out today that the problem with my head was a small area under the third cam tower which allowed the coolant (under pressure) to flood into the head area and and mix quite nicely with the oil. The welding shop which comes highly recommended ground around the problem area and has determined it to be a small, fixable problem. Thanks everyone who helped with my decision concerning the N47 head. I had decided to buy a junk yard E88 since I would have to have a full valve job etc. done anyway, why not use the correct head to start with? Hopefully, I'll be back on the road in a few days as I'm supposed to get the head back on Thursday. To the person who asked about the DGV's, they were on the car when I got it, so I can't compare them to the original flat top carbs. The DGV's do seem to work great however and are less maintenance than a set of DCOE's I had on a previous Z. Thanks again. Bill
 
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