Want this question answered?
3998993 is from 72 or 73 307 or 350. 75 cc chambers.
These should be double hump heads. They are very sought after heads.
Find the casting number on them... type "GM (insert casting number)" into a search engine and you should find what you're looking for.
small block
you can find that type of information at http://www.mortec.com/
I was unable to find that exact number at mortec.com, however if you have a set of 3991492's, they are very possibly a set of 70-up LT1 camel hump heads with 64 cc chambers. These would be valuable heads.
No. The cylinder head on the Type R and GSR are different. The bolt and coolant holes will not match up. However, the Type R's intake manifold will fit a 99-00 Civic SI because their cylinder heads are similar.
Cast iron for a 307 or 350 unless they have 1.72" intake valves then its a 400 head
your a Dylan
Type-casting.
Type cast
ans is none because top gate are used in very large casting due to erosion occur in this casting