NF or 7A block substitution (and possibly MC)

[Ben Swann]

i>? 
Thanks all for the replies so far.  I just wanted to know if I could use the NF block as
a reasonable substitute for a blown 3B.   I have in my garage with all parts to rebuild
the NF.  I may have an MC sitting here too.  I have internals for both MC-1 and NF.
 
Interesting that the NF which is high compression motor makes low comp when putting on a
3B head - doesn't make sense.  When you put an NF head on an MC-1 block - that is good
combination.  MC-1 is a good substitute for the 3B.  So, what makes the compression go
so low?
 
I thought that the NF and 7A were similar, if not the same block? I don't have a 7A but
can get one if that is a better alternative.
 
Is there an ideal combination:  on hand - NF block, 3B pistons and rods,  MC-1 pistons
and rods,  NF pistons and rods.  Rings and bearings, seals for them.
 
I would like to use what I have to put together a decent block to install 3B head on -
without getting into procuring odd and esoteric combinations.  Just want to use what I
have on hand, possibly procuring head-gasket and a few odd bits.  No problem machining
oil return line - BTDT.
 
Ben
 
S-car-list in copy because I thought I'd seen this done for AAN
  _____  

Subject: RE: NF or 7A block substitution
From: "Ben Swann" <benswann at verizon.net>
Date: Fri, March 26, 2010 1:37 pm
To: "'Claus Vegener'" <cv at direkte.org>, <200q20v at audifans.com>
Cc: 'Quattro List' <quattro at audifans.com>

NF is what I have on hand. I am sure I can source an MC- 1 or 2 cheaply enough and have
rebuild parts for those too.

Ben  
 
 <snip> Replies explaining how I can use things I don't have on hand <Snip> 
 
----- Original Message -----
From: "Ben Swann" <benswann at verizon.net>
To: <200q20v at audifans.com>; <s-car-list at audifans.com>
Cc: "'Ben Swann'" <benswann at verizon.net>
Sent: Friday, March 26, 2010 4:41 PM
Subject: NF or 7A block substitution

>
> What's involved in using an NF block as a substitute for the 3B? Just 
> the 034Headgasket? I have 3B with a rod poking into the exhaust 
> manifold due to over-rev with no load when the cruise control rod 
> slipped and jammed WOT.
>
> I have an NF block sitting here and complete rebuild kit on hand 
> bought and paid for, so thought I could use this as a replacement at 
> least in the short term
>
> Ultimately the car may get a twin-turbo 3.7l V8 I'm building, but need 
> something to get this 200 on the road quickly.
>
> Ben