So Vengeance stopped carrying Yella Terras 6645's because of increased failure??
07-03-2012, 08:02 AM
#23
Good morning guys. Since we were mentioned in this thread I felt we should clarify a few things..
* We no longer install Yella Terra 6645s on any of our builds in house.
* We do offer Yella Terra 6645s for sale if a customer calls and requests them, BUT we do inform them of the issues we have had in the past with these rockers.
*Yella Terra offers a shaft mount adjustable rocker that we have had zero failures with. These do require valve cover spacers or aftermarket valve covers.
* In almost 15 years of working on the LS engine I have never seen a stock rocker break, other than to spill the needle bearings. The stock rockers are EXTREMELY strong especially once fitted with the Comp Cams Trunion Upgrade... The reason for going with roller rockers over the stock rockers has much less to do with overall strength and much more to do with valve train geometry. I could go into greater detail on this, but a quick search on the forum will net you plenty of information on this topic.
* IF you do run stock rockers it is highly recommended you have POWDER METAL valve guides.
I hope this helps a bit. If anyone would like to call the shop I would be happy to discuss in greater detail.
* We no longer install Yella Terra 6645s on any of our builds in house.
* We do offer Yella Terra 6645s for sale if a customer calls and requests them, BUT we do inform them of the issues we have had in the past with these rockers.
*Yella Terra offers a shaft mount adjustable rocker that we have had zero failures with. These do require valve cover spacers or aftermarket valve covers.
* In almost 15 years of working on the LS engine I have never seen a stock rocker break, other than to spill the needle bearings. The stock rockers are EXTREMELY strong especially once fitted with the Comp Cams Trunion Upgrade... The reason for going with roller rockers over the stock rockers has much less to do with overall strength and much more to do with valve train geometry. I could go into greater detail on this, but a quick search on the forum will net you plenty of information on this topic.
* IF you do run stock rockers it is highly recommended you have POWDER METAL valve guides.
I hope this helps a bit. If anyone would like to call the shop I would be happy to discuss in greater detail.
Last edited by Ron@Vengeance; 07-03-2012 at 09:42 AM.
07-03-2012, 08:50 AM
#24
TECH Senior Member
Good morning guys. Since we were mentioned in this thread I felt we should clarify a few things..
* We no longer install Yella Terra 6645s on any of our builds in house.
* We do offer Yella Terra 6645s for sale if a customer calls and requests them, BUT we do inform them of the issues we have had in the past with these rockers.
*Yella Terra offers a shaft mount adjustable rocker that we have had zero failures with. These do require valve cover spacers or aftermarket valve covers.
* In almost 15 years of working on the LS engine I have never seen a stock rocker break, other than to spill the needle bearings. The stock rockers are EXTREMELY strong especially once fitted with the Comp Cams Trunion Upgrade... The reason for going with roller rockers over the stock rockers has much less to do with overall strength and much more to do with valve train geometry. I could go into greater detail on this, but a quick search on the forum will net you plenty of information on this topic.
* IF you do run stock rockers it is highly recommended you have bronze valve guides.
I hope this helps a bit. If anyone would like to call the shop I would be happy to discuss in greater detail.
* We no longer install Yella Terra 6645s on any of our builds in house.
* We do offer Yella Terra 6645s for sale if a customer calls and requests them, BUT we do inform them of the issues we have had in the past with these rockers.
*Yella Terra offers a shaft mount adjustable rocker that we have had zero failures with. These do require valve cover spacers or aftermarket valve covers.
* In almost 15 years of working on the LS engine I have never seen a stock rocker break, other than to spill the needle bearings. The stock rockers are EXTREMELY strong especially once fitted with the Comp Cams Trunion Upgrade... The reason for going with roller rockers over the stock rockers has much less to do with overall strength and much more to do with valve train geometry. I could go into greater detail on this, but a quick search on the forum will net you plenty of information on this topic.
* IF you do run stock rockers it is highly recommended you have bronze valve guides.
I hope this helps a bit. If anyone would like to call the shop I would be happy to discuss in greater detail.
07-03-2012, 09:36 AM
#25
Originally Posted by derrickman05
I was at Texas Speed today ordering a top end and when I asked them about a rocker they said nothing beats a stocker with a trunion upgrade. (for what I'm trying to do) I'm sure a 1000$ set of jessels would be just fine but I got upgraded rockers for 1/3 of that
Quote: TransAmcoupe..."Thats the dumbest thing Ive ever heard come from a sponsor..."
Why is it dumb?
The sponsor qualified the recommendation, "for what he's trying to do".
No one but derrickman05 knows what that qualification is.
I was at Texas Speed today ordering a top end and when I asked them about a rocker they said nothing beats a stocker with a trunion upgrade. (for what I'm trying to do) I'm sure a 1000$ set of jessels would be just fine but I got upgraded rockers for 1/3 of that
Quote: TransAmcoupe..."Thats the dumbest thing Ive ever heard come from a sponsor..."
Why is it dumb?
The sponsor qualified the recommendation, "for what he's trying to do".
No one but derrickman05 knows what that qualification is.
07-03-2012, 12:20 PM
#28
Ron, at what point would you NOT recommend stock rockers?
Do you look at the cam or the springs to decide on this in most cases?
I'm running PRC .675 springs with their Ls3 231/236 cam.
I have heard many suggestions and backed by good reason and fact, just curious what another sponsor would say.
Do you look at the cam or the springs to decide on this in most cases?
I'm running PRC .675 springs with their Ls3 231/236 cam.
I have heard many suggestions and backed by good reason and fact, just curious what another sponsor would say.
07-03-2012, 03:13 PM
#29
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Stock rockers are failing on stock cars with stock cams and stock springs because the original ones are a shitty design, not because people are running large cams and heavy springs.
07-03-2012, 03:59 PM
#30
Show me a motor that has died from having needle bearings loose in it. They are too large to get sucked up by the oil pump, they won't fit through the screen.
Stock rockers are failing on stock cars with stock cams and stock springs because the original ones are a shitty design, not because people are running large cams and heavy springs.
Stock rockers are failing on stock cars with stock cams and stock springs because the original ones are a shitty design, not because people are running large cams and heavy springs.
https://ls1tech.com/forums/generatio...ough-idle.html
https://ls1tech.com/forums/generatio...ke-rocker.html
07-03-2012, 05:29 PM
#31
Show me a motor that has died from having needle bearings loose in it. They are too large to get sucked up by the oil pump, they won't fit through the screen.
Stock rockers are failing on stock cars with stock cams and stock springs because the original ones are a shitty design, not because people are running large cams and heavy springs.
Stock rockers are failing on stock cars with stock cams and stock springs because the original ones are a shitty design, not because people are running large cams and heavy springs.
07-03-2012, 06:15 PM
#33
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This was my thread, and now its gone to poop. Yes I know how good and light stock rockers are. THIS IS BASED ON ROLLER ROCKERS FOR TFS HEADS. No I am not gonna spend hundreds of dollars to remove and ship my heads to get powdered metal guides installed. The pushrod and shim kit I bought to use the stock rockers works like *****. Every company's aluminum roller rocker out there do not recommend spring pressures over 400 lbs open. People do it anyway. Eventually some rockers will fail, some wont.
07-03-2012, 06:59 PM
#34
Ron if your installing any cylinder head with a bronze valve guide in-house what rockers do you go with now? Harlans? Scorpions?
I already had Doug replace one of my YT's already, just curious what you recommend now.
I already had Doug replace one of my YT's already, just curious what you recommend now.
Last edited by My6speedZ; 07-03-2012 at 07:09 PM.
07-03-2012, 07:01 PM
#35
This was my thread, and now its gone to poop. Yes I know how good and light stock rockers are. THIS IS BASED ON ROLLER ROCKERS FOR TFS HEADS. No I am not gonna spend hundreds of dollars to remove and ship my heads to get powdered metal guides installed. The pushrod and shim kit I bought to use the stock rockers works like *****. Every company's aluminum roller rocker out there do not recommend spring pressures over 400 lbs open. People do it anyway. Eventually some rockers will fail, some wont.
07-03-2012, 07:17 PM
#36
This was my thread, and now its gone to poop. Yes I know how good and light stock rockers are. THIS IS BASED ON ROLLER ROCKERS FOR TFS HEADS. No I am not gonna spend hundreds of dollars to remove and ship my heads to get powdered metal guides installed. The pushrod and shim kit I bought to use the stock rockers works like *****. Every company's aluminum roller rocker out there do not recommend spring pressures over 400 lbs open. People do it anyway. Eventually some rockers will fail, some wont.
