LM7 Daily Driver Build
07-13-2017, 03:53 PM
#22
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07-13-2017, 04:00 PM
#23
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http://www.yellowbullet.com/forum/sh....php?t=1450946
This was where I got that info from about the line honing
This was where I got that info from about the line honing
07-13-2017, 04:07 PM
#24
Correct, hammer out...hammer in...done. You will need to know specifically what yr block as they changed in 03.
Take EVERYTHING you read on yellowbullet with a grain of salt. Too many chiefs over there and not enough indians.
Besides would it make sense to mass produce a block with a messed up cam bore then go through the process on every single block machined then install an oversize bearing then hone them all out?
If you drive the bearing out you can see the pn on it and search it...you find what i said is right.
If rhe cam tunnel is off the blocks are either rejected or marked as blem and set aside.
Take EVERYTHING you read on yellowbullet with a grain of salt. Too many chiefs over there and not enough indians.
Besides would it make sense to mass produce a block with a messed up cam bore then go through the process on every single block machined then install an oversize bearing then hone them all out?
If you drive the bearing out you can see the pn on it and search it...you find what i said is right.
If rhe cam tunnel is off the blocks are either rejected or marked as blem and set aside.
07-13-2017, 04:53 PM
#25
07-13-2017, 04:58 PM
#26
TECH Senior Member
Most bearings nowadays are steel-backed, with bearing material that is soft aluminum-based alloy.
07-13-2017, 05:47 PM
#28
That doesn't say GM uses those, looks like a new Product, or is this older Marketing?
The reason I ask, the last Cam Bearings in a 5.3 I replaced had a copper color to them.
Any Idea what the FM stands for?
The reason I ask, the last Cam Bearings in a 5.3 I replaced had a copper color to them.
Any Idea what the FM stands for?
07-14-2017, 09:09 AM
#30
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I have been doing some more reading (dangerous, I know), and it seems to me that my plan to use the stock rockers with a bushing trunion upgrade may not be the best choice, for these reasons:
-I want to be able to drive the truck every day, for another 100,000 miles if I own the truck that long, and the engine still be in good condition like it was for the original 150,000.
-It seems that the bushings are claimed to only be good for a certain period, which makes sense, because a bushing is obviously a wear item. I have seen claims for 50,000 miles, but who knows if that is an accurate figure, they may go more or less than that.
My next question, is there an aftermarket roller rocker arm that will be totally reliable for a lot of miles, that I can use on my stock heads, and I can just spend the extra money on them now to get rid of any worry about valvetrain wear?
Harland Sharp
Comp
Yella Terra
Scorpion
Mast
Or any others?
-I want to be able to drive the truck every day, for another 100,000 miles if I own the truck that long, and the engine still be in good condition like it was for the original 150,000.
-It seems that the bushings are claimed to only be good for a certain period, which makes sense, because a bushing is obviously a wear item. I have seen claims for 50,000 miles, but who knows if that is an accurate figure, they may go more or less than that.
My next question, is there an aftermarket roller rocker arm that will be totally reliable for a lot of miles, that I can use on my stock heads, and I can just spend the extra money on them now to get rid of any worry about valvetrain wear?
Harland Sharp
Comp
Yella Terra
Scorpion
Mast
Or any others?
07-14-2017, 11:39 AM
#31
I have been doing some more reading (dangerous, I know), and it seems to me that my plan to use the stock rockers with a bushing trunion upgrade may not be the best choice, for these reasons:
-I want to be able to drive the truck every day, for another 100,000 miles if I own the truck that long, and the engine still be in good condition like it was for the original 150,000.
-It seems that the bushings are claimed to only be good for a certain period, which makes sense, because a bushing is obviously a wear item. I have seen claims for 50,000 miles, but who knows if that is an accurate figure, they may go more or less than that.
My next question, is there an aftermarket roller rocker arm that will be totally reliable for a lot of miles, that I can use on my stock heads, and I can just spend the extra money on them now to get rid of any worry about valvetrain wear?
Harland Sharp
Comp
Yella Terra
Scorpion
Mast
Or any others?
-I want to be able to drive the truck every day, for another 100,000 miles if I own the truck that long, and the engine still be in good condition like it was for the original 150,000.
-It seems that the bushings are claimed to only be good for a certain period, which makes sense, because a bushing is obviously a wear item. I have seen claims for 50,000 miles, but who knows if that is an accurate figure, they may go more or less than that.
My next question, is there an aftermarket roller rocker arm that will be totally reliable for a lot of miles, that I can use on my stock heads, and I can just spend the extra money on them now to get rid of any worry about valvetrain wear?
Harland Sharp
Comp
Yella Terra
Scorpion
Mast
Or any others?
of the hot cam? It only makes a few more HP up top and looses a few HP in the lower RPM where you mostly use the cam in a daily, unless you drive wide open
everywhere you go, more lift means more stress on valve train, the stock
rocker arms would rather not have the extra lift, especially for the same HP.
I dont get why people want more lift for not hardly any more power. What
did they claim 10 HP, would you even feel 10 HP? So less power where you
normally drive for more stress on the valve train.
The GM version of the Hot Cam would be more reliable in the long run. And
GM version you can use stock length pushrods. For the high lift version
they use a smaller base circle on the cam lobe so the lifter sits farther away
from rocker arm so you have to use a longer push rod, so you have to measure
for longer pushrods, too much trouble for not much gain and more stress.
My .02
Don't forget Texas Speed Has new Roller Tip Rocker Arms which look like they be worth having,
suppost to be light on the valve side.
07-14-2017, 12:16 PM
#32
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If you are concerned with reliability why do you want to use the high lift version
of the hot cam? It only makes a few more HP up top and looses a few HP in the lower RPM where you mostly use the cam in a daily, unless you drive wide open
everywhere you go, more lift means more stress on valve train, the stock
rocker arms would rather not have the extra lift, especially for the same HP.
I dont get why people want more lift for not hardly any more power. What
did they claim 10 HP, would you even feel 10 HP? So less power where you
normally drive for more stress on the valve train.
The GM version of the Hot Cam would be more reliable in the long run. And
GM version you can use stock length pushrods. For the high lift version
they use a smaller base circle on the cam lobe so the lifter sits farther away
from rocker arm so you have to use a longer push rod, so you have to measure
for longer pushrods, too much trouble for not much gain and more stress.
My .02
Don't forget Texas Speed Has new Roller Tip Rocker Arms which look like they be worth having,
suppost to be light on the valve side.
of the hot cam? It only makes a few more HP up top and looses a few HP in the lower RPM where you mostly use the cam in a daily, unless you drive wide open
everywhere you go, more lift means more stress on valve train, the stock
rocker arms would rather not have the extra lift, especially for the same HP.
I dont get why people want more lift for not hardly any more power. What
did they claim 10 HP, would you even feel 10 HP? So less power where you
normally drive for more stress on the valve train.
The GM version of the Hot Cam would be more reliable in the long run. And
GM version you can use stock length pushrods. For the high lift version
they use a smaller base circle on the cam lobe so the lifter sits farther away
from rocker arm so you have to use a longer push rod, so you have to measure
for longer pushrods, too much trouble for not much gain and more stress.
My .02
Don't forget Texas Speed Has new Roller Tip Rocker Arms which look like they be worth having,
suppost to be light on the valve side.
The Texas Speed rockers do look nice, but for the price point, they still use the Comp style roller bearings that are supposed to suck. So that puts me back at a stock rocker with a bushing. I think that is what I will end up going with. I also think I will do the CHE over the Straub kit though. I talked with CHE, and they say their bushings will be good for lots of miles. I know their other products are top notch too, so these should be no different.
Last edited by BuschPerformance; 07-14-2017 at 02:38 PM.
07-14-2017, 12:28 PM
#33
The cam didnt lose any hp down low. the variation is within the margin of error esp a run from 2+ months earlier and 30 degrees cooler. This was one test also and the lobes have been redesigned since then.
As far as reliability, there is zero evidence to show these lobes are any less reliable than the gm cam. The cam core is def more durable and made of better steel to start with.
As stated by Dave thsy tested the cam, he gave his personal feedback in that it drove better and was quieter underhood than the og hot cam.
Op youll be very pleased with the cam. You are correct, the bushings will wear but the jury is still out on how long they will last. It will depend on many more factors than just miles of course. We are offering an option soon as well...when it is ready, we will let you know!! It will be very soon.
As far as reliability, there is zero evidence to show these lobes are any less reliable than the gm cam. The cam core is def more durable and made of better steel to start with.
As stated by Dave thsy tested the cam, he gave his personal feedback in that it drove better and was quieter underhood than the og hot cam.
Op youll be very pleased with the cam. You are correct, the bushings will wear but the jury is still out on how long they will last. It will depend on many more factors than just miles of course. We are offering an option soon as well...when it is ready, we will let you know!! It will be very soon.
07-18-2017, 07:16 AM
#35
TECH Addict
I have been doing some more reading (dangerous, I know), and it seems to me that my plan to use the stock rockers with a bushing trunion upgrade may not be the best choice, for these reasons:
-I want to be able to drive the truck every day, for another 100,000 miles if I own the truck that long, and the engine still be in good condition like it was for the original 150,000.
-It seems that the bushings are claimed to only be good for a certain period, which makes sense, because a bushing is obviously a wear item. I have seen claims for 50,000 miles, but who knows if that is an accurate figure, they may go more or less than that.
My next question, is there an aftermarket roller rocker arm that will be totally reliable for a lot of miles, that I can use on my stock heads, and I can just spend the extra money on them now to get rid of any worry about valvetrain wear?
Harland Sharp
Comp
Yella Terra
Scorpion
Mast
Or any others?
-I want to be able to drive the truck every day, for another 100,000 miles if I own the truck that long, and the engine still be in good condition like it was for the original 150,000.
-It seems that the bushings are claimed to only be good for a certain period, which makes sense, because a bushing is obviously a wear item. I have seen claims for 50,000 miles, but who knows if that is an accurate figure, they may go more or less than that.
My next question, is there an aftermarket roller rocker arm that will be totally reliable for a lot of miles, that I can use on my stock heads, and I can just spend the extra money on them now to get rid of any worry about valvetrain wear?
Harland Sharp
Comp
Yella Terra
Scorpion
Mast
Or any others?
07-18-2017, 07:56 AM
#36
Teching In
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