Found this in my oil pan

[patrickt]

Doug, I don't know if you read the description of the engine in the vid, but this is interesting: "... the camshaft was ground with a 113-degree lobe separation angle and 242/248 @ .050-inch-lift duration numbers. Rabotnick was unwilling to disclose lift numbers, but we can say that they are ‘healthy’."

[dcdoug]

Originally Posted by patrickt

Doug, I don't know if you read the description of the engine in the vid, but this is interesting: "... the camshaft was ground with a 113-degree lobe separation angle and 242/248 @ .050-inch-lift duration numbers. Rabotnick was unwilling to disclose lift numbers, but we can say that they are ‘healthy’."

I saw it. I'm going to change out the cam. Brent's going to do a custom grind (we haven't talked about what yet). My Holman Moody "B" cam is in great shape so I may sell it along with the Lemans rods and TRW pistons.

[patrickt]

Originally Posted by dcdoug

I saw it. I'm going to change out the cam. Brent's going to do a custom grind (we haven't talked about what yet). My Holman Moody "B" cam is in great shape so I may sell it along with the Lemans rods and TRW pistons.

I think that's a good plan. Post the specs when you decide on them.

[dcdoug]

Originally Posted by patrickt

I think that's a good plan. Post the specs when you decide on them.

I'll just send you a PM.

[patrickt]

Originally Posted by dcdoug

I'll just send you a PM.

Humorous. Note that the duration and LSA Barry chose for the cam in that vid are pretty darn close to my 54 year old "K" cam.

[blykins]

The cam in the video is a hydraulic roller.

Yours is a flat tappet.

You are losing duration to lash. The hydraulic roller is not.

I love reading those magazine articles, they act like the lift is some wampuss-cat sky-high number that's very secretive. I'm not a betting man, but I'd say it's around .600".

On a hydraulic roller with an FE, you have to play the numbers game. You can either use an aggressive lobe that will make noise and not make power, or you can use a less aggressive lobe that will make power, will be quiet, but will have a high advertised duration. When you try to run vacuum accessories with a high advertised duration, you have to widen the LSA to get the overlap down.

Your cam is antiquated, Patrick.

[patrickt]

Originally Posted by blykins

Your cam is antiquated, Patrick.

So am I.

[dcdoug]

Originally Posted by patrickt

I think that's a good plan. Post the specs when you decide on them.

Here are the cam specs:

Custom Comp Cams solid flat tappet:
291/299 advertised duration, 254/262 @ .050", 108 LSA on 104 ICL, .584"/.602"

[patrickt]

Originally Posted by dcdoug

Here are the cam specs:

Custom Comp Cams solid flat tappet:
291/299 advertised duration, 254/262 @ .050", 108 LSA on 104 ICL, .584"/.602"

That's beefier than what you've got now. The "advertised duration" of your current cam is 324 degrees (IIRC), but they measure it from a different spot, so you really can't compare it easily. The .050" numbers are significantly harrier than 245/245 106 LSA and .500" lift after your lash is taken out.

[dcdoug]

Originally Posted by patrickt

That's beefier than what you've got now. The "advertised duration" of your current cam is 324 degrees (IIRC), but they measure it from a different spot, so you really can't compare it easily. The .050" numbers are significantly harrier than 245/245 106 LSA and .500" lift after your lash is taken out.

And this one gets lashed tighter at .015.