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need help choosing cam
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bigtizzles
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PostPosted: Thu Jan 20, 2011 2:15 pm    Post subject: Reply with quote

what do you think about this kit from Alex's parts. Its half the price and is supposed to be made by a name brand supplier.
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clay
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1972 Chevrolet Nova

PostPosted: Thu Jan 20, 2011 4:23 pm    Post subject: Reply with quote

Checked my cousins Vortec heads yesterday. I only checked the exhaust. Valve seal was stil on it. Retainer hits the seal at 0.490" lift. Take away the recommended 0.060" safety margin and you are at 0.430". Just for curiosity I put and indicator on the pushrod and checked lobe lift. It came up right at 0.287" - multiply by 1.5 and bingo - 0.430" lift at the valve. So basically you can't even put on a 1.6 rocker without doing something. I checked clearance where the rocker arms overhang the valve tip for guiding purposes and it has more than 0.050" clearance. I'm going to try aftermaket retainers and a +0.050" lock and see what happens. I have seen the spring set from Comp you are talking about and it is pretty pricey and not really needed for this particular motor I'm working on (I really wish he'd leave it alone). If I can get it to work for not too much money, I'll take some pictures and start a seperate thread. Clay
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Big Dave
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PostPosted: Thu Jan 20, 2011 8:17 pm    Post subject: Reply with quote

Thanks for the unbiased scientific investigation Clay. I never realized before that the stock lift was so close to the maximum allowed.

Everyone in the market place is all for adding more lift (if you just buy my magic beans) to these heads and I question just how much more lift some of these alleged solutions will actually buy you short of remanufacturing the head and installing 1.55 inch dual springs and PC oil seals on bronze guides for smaller valve stem valves.

Big Dave
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Paul P
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PostPosted: Thu Jan 20, 2011 9:49 pm    Post subject: Reply with quote

I have a brand new cam and lifters for sale that is very similar to the 1103.

See link. Looks to be a good match for your application. See cam card at the bottom of post.

http://boston.craigslist.org/bmw/pts/2164988491.html

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2001 Focus 2.0 Zetec
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1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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af2
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1933 Willys Coupe

PostPosted: Thu Jan 20, 2011 10:52 pm    Post subject: Reply with quote

Clay, were those the 062 head?
The 906 is different.
Wondering now on another build. Confused
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clay
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PostPosted: Fri Jan 21, 2011 3:44 am    Post subject: Reply with quote

Quote:
I never realized before that the stock lift was so close to the maximum allowed.

Me either. Kinda caught me by surprise too. I don't need to add much lift. This application is for a 4WD truck so I'm looking at cams in the 220's at 0.050" range. They come in right around the 0.480" - 0.500" lift range. That's why I'm thinking I can make it with the locks.

Quote:
Clay, were those the 062 head?

Didn't pay attention when I did the valve lift quick check. I'll look tomorrow before I go to work and let you know. Hopefully I'll have some free time Saturday afternoon and I can start to take some pictures and do some better documentation about what I'm doing.

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clay
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PostPosted: Fri Jan 21, 2011 1:51 pm    Post subject: Reply with quote

They are 906's. Clay
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squeeezer
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PostPosted: Fri Jan 21, 2011 5:00 pm    Post subject: Reply with quote

906=thicker exhaust seat that is all


and 1 more mod you should do @.500 lift is screw in rocker studs

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af2
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PostPosted: Fri Jan 21, 2011 6:51 pm    Post subject: Reply with quote

squeeezer wrote:
906=thicker exhaust seat that is all


and 1 more mod you should do @.500 lift is screw in rocker studs


Hmm just thinking and brought out the 2002 edition of PP GM.

I was mistaken on the cam. The real # is .435/.460. on 062 heads.
Again Something was changed besides the E/Valve seat thickness.

Carry on I am still searching. Laughing
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Paul P
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PostPosted: Fri Jan 21, 2011 8:14 pm    Post subject: Reply with quote

Did you look at my craigslist add? It is for that exact application with slightly less than 220 at .050. I have the whole package that I was going to put on my truck available.
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2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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bigtizzles
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PostPosted: Sat Jan 22, 2011 1:39 am    Post subject: Reply with quote

I showed the spring kit to the machinist and we did a bunch of measurements with the installed height that the spring kit gave, and the machinist was skeptical but said if the retainer and lock were radicle enough, that it might work. So I ordered the spring kit. It already shipped, I even talked to the guy on the phone (nice guy) and he swears by them. I'll let you guys know what happens when we throw it together and do some measurments.
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squeeezer
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PostPosted: Sat Jan 22, 2011 10:20 am    Post subject: Reply with quote

af2 wrote:
squeeezer wrote:
906=thicker exhaust seat that is all


and 1 more mod you should do @.500 lift is screw in rocker studs


Hmm just thinking and brought out the 2002 edition of PP GM.

I was mistaken on the cam. The real # is .435/.460. on 062 heads.
Again Something was changed besides the E/Valve seat thickness.

Carry on I am still searching. Laughing





yes that lift should be ok for stock heads
@.470 lift your seals will be smashed
.420 is a lift figure that is tossed around like Smoke said on the conservative side

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bigtizzles
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PostPosted: Sat Jan 22, 2011 5:11 pm    Post subject: Reply with quote

we are gonna try for a .465/.488 lift with this spring kit. Supposed to allow up to .550 just like the comp kit. Now the concern is the valves I bought have 2 lock grooves, the upper one is for the Vortec application. So knowing my luck the bottom groove will interfere with the seal. Worst case I'll have to get different valves. I would think the spring would bind before the lower groove in the valve stem would get as far down as the seal, but we'll see.
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