Been awhile since I last posted. Aluminum slant six, were all the heads stamped "SPECIAL"? Local guy has an aluminum motor however the head is not stamped "SPECIAL". The head as a riveted plate with no other markings

No, only the first batch of heads for the aluminum engine were marked "SPECIAL". The next batches had plain plates or 5-pointed stars, and the last batch had the 2206035 casting number and was used on both iron and aluminum engines.

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.

What was special? Is it just more accurate location of the combustion chambers and other features? Or are there other significant differences?

_________________
--> Check out my FI Turbo build <--
--> And the race truck build project <--
--> The Diesel Corvette <--

Thanks Dan. Been awhile since ive had a conversation about the subject. I think his plate has the star.

I believe chamber/casting dimensions and registration were the only improvements.

Lou

_________________
Home of Slant6-powered fun machines since 1988

Slightly smaller combustion chamber with more accurate placement consistency, notched pushrod cavities to provide the necessary extra clearance for the angle the pushrods sit at in the aluminum engine. These changes were incorporated on all \6 heads officially for the 1963 model year, but actually during mid-late '62 production.

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.

They were different than the cast iron engine?? I never knew that.

_________________
2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

Whoa, yeah, tell us more...

Lou

_________________
Home of Slant6-powered fun machines since 1988

Full details are in this (copyrighted) technical paper. Brief description here:

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.