1967 Cougar build (over 500 pictures and videos)
07-03-2019, 12:28 PM
#1142
TECH Senior Member
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Project GatTagO (07-03-2019)
07-03-2019, 12:49 PM
#1143
yeah that trick works perfectly fine! ive done it before just MAKE SURE NOT TO BREAK THE STICKS ( mine were wooden from home depot ) p.s no i didnt break mine
and once the cams back in you slide the rods out and spin the cam and there you go! simple easy!
and once the cams back in you slide the rods out and spin the cam and there you go! simple easy!
07-03-2019, 01:30 PM
#1144
No voodoo magic at all. On a LS, you don't get access to the lifters even if you remove the intake and the valley cover. The lifters are only accessible by removing the heads. However, the lifters sit in a plastic tray that holds them in place.
Once the cam gear and the cam retainer plate are removed, you spin the cam over my hand, which pushes the lifters up into their trays. If you're brave, you yank the cam and stab the new one in. If you're not as brave, there are two holes that are expose when the cam retainer plate is removed. Stick two 5/16" wooden dowels into those holes. This locks the lifters in place so they do not fall into the cam passage. Since I was in a situation where a lifter dropping would be tragic, I used the dowel method. Inserted the new cam, removed dowels.
The actual swapping of the cam took 2 minutes.
Andrew
Once the cam gear and the cam retainer plate are removed, you spin the cam over my hand, which pushes the lifters up into their trays. If you're brave, you yank the cam and stab the new one in. If you're not as brave, there are two holes that are expose when the cam retainer plate is removed. Stick two 5/16" wooden dowels into those holes. This locks the lifters in place so they do not fall into the cam passage. Since I was in a situation where a lifter dropping would be tragic, I used the dowel method. Inserted the new cam, removed dowels.
The actual swapping of the cam took 2 minutes.
Andrew
I'm missing something. If you simply rotate the cam over, the valve springs are gonna keep the lifter in contact with the lobe.... Presume rockers have to come off first? And then, how can you get the lifter up higher into the "plastic tray" than the top of the cam lobe -- which you'd have to do to get a dowel under the lifter....still confused.
07-03-2019, 01:38 PM
#1145
TECH Senior Member
Uh - more detail needed. Sorry. It's me.
I'm missing something. If you simply rotate the cam over, the valve springs are gonna keep the lifter in contact with the lobe.... Presume rockers have to come off first? And then, how can you get the lifter up higher into the "plastic tray" than the top of the cam lobe -- which you'd have to do to get a dowel under the lifter....still confused.
I'm missing something. If you simply rotate the cam over, the valve springs are gonna keep the lifter in contact with the lobe.... Presume rockers have to come off first? And then, how can you get the lifter up higher into the "plastic tray" than the top of the cam lobe -- which you'd have to do to get a dowel under the lifter....still confused.
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Project GatTagO (07-04-2019)
07-03-2019, 02:16 PM
#1148
TECH Senior Member
It doesn't get the lifter "higher" than the lobe, just high enough that the cam slides out nicely, and the new one slides in. With the lifters up, the dowels slide in to keep them at cam-changing height. I know, maybe this doesn't explain it well enough, but believe that it works, as it has innumerable times.
07-03-2019, 02:16 PM
#1149
Most people are wondering what was that “meal” Andrew was eating? That yummy picture is a Mexican shrimp cocktail, that’s the appetizer, can’t go wrong after starting with a shrimp cocktail! Thanks Andrew now I’m craving one!
07-03-2019, 04:13 PM
#1150
The only way a 5/16” dowel can slide in to support the lifter under the roller is if you can get the lifter 5/16” higher than the lobe peak. I’m trying to understand how that can happen with a simple rotation of the cam. I’ve asked in several threads - haven’t heard a credible explanation yet. I believe it happens - just trying to understand the mechanism.
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Project GatTagO (07-03-2019)
07-03-2019, 04:35 PM
#1153
TECH Senior Member
Thread Starter
iTrader: (7)
The only way a 5/16” dowel can slide in to support the lifter under the roller is if you can get the lifter 5/16” higher than the lobe peak. I’m trying to understand how that can happen with a simple rotation of the cam. I’ve asked in several threads - haven’t heard a credible explanation yet. I believe it happens - just trying to understand the mechanism.
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Project GatTagO (07-04-2019)
07-04-2019, 10:21 AM
#1156
TECH Senior Member
Wow, that cam is making a name for itself, and a GOOD one! More power on less fuel is a win-win for sure! Way to go!
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Project GatTagO (07-04-2019)
07-04-2019, 10:27 AM
#1157
TECH Senior Member
Looking at an LS7 lifter, there is a body diameter reduction about in the middle, where I would bet is where the dowel catches it. And looking at the front of the engine to see where the dowel slides in backs that up.
07-04-2019, 11:14 AM
#1159
TECH Senior Member
Thread Starter
iTrader: (7)
New cam: 222/233 .600/.575" 115 lobe separation
Less duration, more lift, obviously the lobes are more aggressive, but the cam is overall milder. Old cam idles around 58kPa, new cam is around 45kPa and will idle easily at 750RPM.
Andrew
07-04-2019, 11:43 AM
#1160
TECH Senior Member
Old cam is GM ASA grind 226/236 .525"/.525" 110 lobe separation
New cam: 222/233 .600/.575" 115 lobe separation
Less duration, more lift, obviously the lobes are more aggressive, but the cam is overall milder. Old cam idles around 58kPa, new cam is around 45kPa and will idle easily at 750RPM.
Andrew
New cam: 222/233 .600/.575" 115 lobe separation
Less duration, more lift, obviously the lobes are more aggressive, but the cam is overall milder. Old cam idles around 58kPa, new cam is around 45kPa and will idle easily at 750RPM.
Andrew