[TR] Identifying Spitfire Cylinder head # TKC 2748( Now another Head and Block)

[pethier at comcast.net]

I don't think either the small car or foreign car thing answers this.  I'm pretty sure my 1975 VW Rabbit had a cat can and a small filler hole. 

Yes trucks over a certain size had examptions. That is what spawned the "heavy duty half". 

Phil Ethier West Side Saint Paul Minnesota USA
1973 Triumph Stag LE22439UB "uncle jack"
1979 Caterham Super Seven
2004 Suburban 8.1
2007 Saturn Ion 3 2.4
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