1970 Street Hemi camshaft specs?

Hi everyone..A newbie here!
I am looking for the .050 camshaft specs for the factory hyd. camshaft,which came in the 1970 426 Hemi. Timing events and duration measured at .050 tappet lift.
Thanks!

 

I don't have the @ .050" specs, but there's what my old NHRA Technical Guide shows (the 820 is what you want, I believe):

 

Shocking that no one knows what a stock Hemi cam looks like :bla:

 

Well,I have located one and will put the degree wheel to it! :laugh: :TU:

 

Its the pure stock thread area why would anyone know what a stock anything looks like.ou:

 

Pure Stock.....taken at it's word! I was just curious of what the .050 specs were. Not that I am building a Pure, with a wink,wink, Stock race car.
My brother,who has his original 70' Hemicuda,still hidden away,has found the cam. If I can down size my picture,I will post it up.

 

most buick guys dont know cuz the hemis were always too far behind, us to notice.

 

I am having my back bumper rechromed so the reflection will blind them down the track

 

I guess a Mopar guy should provide the info! :blast:


Advertised duration: 284/284
Duration @ .050: 241/241
Overlap: 70
Centerline: 106*
Lift: .484/.475

This was the Street Hemi grind from 1968-1971

 

Mopar only released the information when they came out with the new faster cam ramp purple shaft cam. The newer version is advertised as 280 degrees and the original is 284 degrees. Mopar stated the 0.050" duration to demonstrate the faster cam ramps of the new cam. The original 284 cam was said to be 228 degrees at 0.050" and the 280 cam is 234 degrees at 0.050". Some time later Competition Cams claimed to have measured the two cams and came up with the original 284 cam as having 227 degrees at 0.050" and the 280 cam having 233 degrees. So Competition Cams measurements were within one degree of what Mopar said they were.

Some sources says the original 284 camshaft has 106 lobe separation for 72 degrees of overlap and some sources claim it has 108 lobe separation for 68 degrees overlap. The 280 camshaft has 110 degree lobe separation for 60 degrees overlap. Old school theory was to install the cam straight up at split overlap so the intake lobe is the same position as the lobe separation. The newer and current theory is to install the camshaft with the intake lobe at 106 degrees regardless of lobe separation for best power. Best torque is with the intake lobe at 102 degrees, but diesels make torque, making horsepower is what it's about so install the camshafts with the intake lobe at 106 degrees.