Quote:
Originally Posted by Steeveedee
That's a lot of plugs!  Did the 402 get the taper seat plugs in '71? Mine still has the N-type 14 mM long reach. |
Factory 402 heads take the tapered plug. That's not to say GM never built one otherwise. So 71 is generally correct. If I recall, there was a slow transition 396 to 402, which occurred in some 1970
The trucks are badged 396, but have 402 blocks. Makes me ponder if GM assembled "396" heads on 402 blocks
I can't speak for all 396 heads, mine came off a 68 HP Camaro. They generally or always take the flat-seated gasket type plug.