camshaft question

[86chevyk10]

im rebuilding my 350 currently, pretty much a stock rebuild, stock heads, basically a bore and freshen up. im looking for a camshaft but i cannot grasp the duration and lift concept, would Duration 262/272, Lift .420/.442 be good for my type motor. i know theres probably alot of variables you need to know about my motor, but the motor is nothing special, just a dd lookin for a little extra power. people talk about a "RV" cam, what duration and lift would yall recommend?

 

[76zimmer]

with that lift it sounds like the duration is gross duration (@the seat) what are the @.050 measurements.
I have put cams in 350's for smooth idle that have about .450 lift, and 210-220 duration @ .050. Comp Cams 260 and 268 are pretty good for making more power with a relatively smooth idle on stock engines.

 

[86chevyk10]

I believe the lift is 204/214 @ 050.

 

[76zimmer]

that would be the duration, personally, I would try for a little more lift though. Are you having any headwork done? That is really where the power is at.

 

[86chevyk10]

well instead of trying to describe the cam, here's a link, http://www.summitracing.com/parts/SUM-1102/ i was planning on going with a comp or edelbrock cam, but the guys @ summit said their cam is a reboxed edelbrock (he may have said comp, basically a reboxed name brand) so i figured since im on somewhat of a budget, it would work.... suggestions?

 

[76zimmer]

well you seem pretty set on this cam, just make sure use a break in lube, and to run an oil made specifically for flat tappet cams.

 

[ciffer]

well you seem pretty set on this cam, just make sure use a break in lube, and to run an oil made specifically for flat tappet cams.

as far as i know, there is no oils for flat tappets other than maybe some racing oils. however, redline sells engine break in additive.

http://www.summitracing.com/parts/RED-81403/

my understanding is that it will provide the zddp content needed to help flat tappets live with API SM oil.

 

[blazin_blazer]

rotella T is supossed to be a good oil for break in runs.

 

[76zimmer]

rotella T is supossed to be a good oil for break in runs.

 

[Ned Kelly]

I agree Rotella was recommended up until recently, but double check Rotella now, as they have reformulated and zinc was (or is going to be) removed. I was told this by our oil supplier and they advised me that their new stock of Rotella does not have zinc.
You may have to get the break in additive.