Hi, need some info on head and intake casting numbers. Preparing to start tearing my motor down and was checking the casting # on the heads and have 1374 03, yup thats a space between the 4 and 3. By my list (thanx Buicks.net) it should be 1374603. This is definately a space on both heads. Does this have any signifigance? Next up is my 2x4 intake 1370316B, does the B have any signifigance? Also I am still looking for some guidance on porting the heads. Thanx for any info coming. Lou
