[Paul Ceasrine]

Rich,

I was always confused with those Pontiac Combinations,

As to what combination came from the Factory, what was the Dealer Installed Option, and what came in the 'Trunk'.

Factory Camshaft Applications for the Pontiac 370
Part #521357 -------- .373"/.373" Lift ~ 252*/252" Duration ~ 38* Overlap ~ Code '357'
Part #529472 --------.407"/.411" Lift ~ 273*/282* Duration ~ 55* Overlap ~ Code '472'
Part #522869 --------.406"/.406" Lift ~ 289*/298* Duration ~ 50* Overlap
Part #524886 --------.411"/.411" Lift ~ 283*/293" Duration ~ 60* Overlap ~ Code''886'

The McKellar #6 was introduced in 1958.

The McKellar #7 was introduced in 1960 {.404"/.405 ~ 300"/304* Duration}
The McKellar #10 was introduced in 1961 {.520"/.520" Lift ~ 306*/320* Duration}

The McKellar #7 and #10 Camshafts were 'Solid Lifter' designs, but later a Hydraulic 'design' version was offered.