[Squidward]

.050 numbers were created as a standard to compare cams from different manufacturers. When companies used advertised duration, some used .002, some used .006, etc.

Maybe Summit uses a different standard for advertised duration than Lunati. I think Lunati uses a .006 standard.

FWIW, the Voodoo cam has a faster opening ramp. Paul Carter could chime in. He uses a lot of Voodoo cams, and had personal dialog with the designer.

[pastry_chef]

As noted above many different manufacturers choose to rate "advertised duration" at different points.
Generally .006 tappet lift is the most common.

Yet the catalog numbers advertised do not tell the whole story.

Like cylinder heads, with cam lobes I like to look at the pedigree of a lobe design.

Harold Brookshire who designed the Ultradyne and Voodoo lobes was one of the best ever.

Mike Jones is another great.
http://jonescams.com/hydraulic-flat-tappet/

Some lobes may be lazy, others too aggressive.
A great designer is your best crack at just right.

[455rebel]

[QUOTE=Squidward;5650622].050 numbers were created as a standard to compare cams from different manufacturers. When companies used advertised duration, some used .002, some used .006, etc.

Maybe Summit uses a different standard for advertised duration than Lunati. I think Lunati uses a .006 standard.

This is why I compare @.050
Looking at these numbers they do look similar. Not exact but in the same ball park.

Progress has slowed to a crawl.
Timing cover on, fuel pump on, water pump on, installed ballencer last night,when bolting pulley to ballencer , noticed a buggered up thread in one of the 4 bolts that hold it on, retapping that tonight.
Got all 8 plugs cleaned and installed. Still got ps and alt to mount and oil change.
Single dad with 2 kids at home, and run my own business has to come first.
Should have it running and a new compression test by weekend.
As always thanks.
I'm betting the cam advanced (my bad) was the issue!

[TedRamAirII]

[QUOTE=455rebel;5650993]

Originally Posted by Squidward

.050 numbers were created as a standard to compare cams from different manufacturers. When companies used advertised duration, some used .002, some used .006, etc.

Maybe Summit uses a different standard for advertised duration than Lunati. I think Lunati uses a .006 standard.

This is why I compare @.050
Looking at these numbers they do look similar. Not exact but in the same ball park.

Progress has slowed to a crawl.
Timing cover on, fuel pump on, water pump on, installed ballencer last night,when bolting pulley to ballencer , noticed a buggered up thread in one of the 4 bolts that hold it on, retapping that tonight.
Got all 8 plugs cleaned and installed. Still got ps and alt to mount and oil change.
Single dad with 2 kids at home, and run my own business has to come first.
Should have it running and a new compression test by weekend.
As always thanks.
I'm betting the cam advanced (my bad) was the issue!

How far advanced was it?

[455rebel]

[QUOTE=TedRamAirII;5651028]

Originally Posted by 455rebel

How far advanced was it?

I have a 3 key crank sprocket, adv, straight up, and retard. It was in the adv key so I put it straight up.
When checking the timing on the ballencer, it moved bout 4 deg.
From 8btdc(before sprocket key change) to 4btdc(after).