[x-bird2]

Originally Posted by spb350

One head is dated F233 and the other is K282, are there any differences in these castings? Anybody have a set dated like this on their original car or are these too far apart?

No physical differences in the castings for all of the SD heads, no matter the date code. I take it these are a pair you picked up along the way, not with an original SD car? (I remember you were selling SD engine/parts awhile back) It's kind of hard to tell from the pics you've posted, but if you look at the exhaust ports, you can see definite porting/grinding marks on the outer portion, deeper inside you can see the original as-cast surface which is a bit "pebbly" appearing. I wouldn't worry about there being much difference porting wise between this pair

[spb350]

Originally Posted by x-bird2

No physical differences in the castings for all of the SD heads, no matter the date code. I take it these are a pair you picked up along the way, not with an original SD car? (I remember you were selling SD engine/parts awhile back) It's kind of hard to tell from the pics you've posted, but if you look at the exhaust ports, you can see definite porting/grinding marks on the outer portion, deeper inside you can see the original as-cast surface which is a bit "pebbly" appearing. I wouldn't worry about there being much difference porting wise between this pair

The guy I bought these heads from said he got a complete SD motor out the back door of a dealership back in 1974. The engine had spun a bearing or threw a rod so the guy just took everything off and scraped the block. According to him they were on the same engine as delivered from the factory. I have had some SD parts and a couple of engines, but I need some space so something has got to go. I have pretty much decided to restore my 73 back to stock appearing, the 4X's (7H's) I have should flow almost as good as these and I have way less into them.