[ROVERNET - UK] '80 SD1 block into a '70 3500s
kkinard at swbell.net
Tue Nov 1 16:05:18 GMT 2005
Hi Peter, Lex, and Pierre,
Any NAS SD1 will have 8.13:1 compression. Major advantages to the SD1
block are the front and rear crank seals. If you have the heads, they
are somewhat better, but don't go looking for them if you don't have
them. They use different spark plug threads from the earlier heads.
Also different valves and valve springs.
Peter King wrote:
> Hi all.
> I'm rebuilding a seized '70 3500s engine, and considering using a block
> (complete) from an '80 SD1. I understand the compression ratio is
> different (9.xx:1 vs. 10:1 in the older engine), and I'm wondering if
> there are any problems or special considerations I should be aware of in
> making the exchange?
> Thanks for any advice you can send my way.
> Peter King
> Peter King & Company
> 368 Congress Street
> Boston, MA 02210
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