Aftermarket LSx Rockers and Valvetrain Stability... Dyno Results inside.
04-09-2011, 02:46 PM
#61
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They often do. Some clear by a wee bit and some arent even close and yet some 245s we had not that long ago worked as is out of the box with 3/8ths.
You can "scootch" the head all the way to the exhaust side which might give you a few thou when you bolt the heads down and then you can "scootch" the rocker pair towards to the intake side and get another .015 or so and sometimes this can get you by.
As has been said though we have probably installed a 100 sets of these things easy from other shops and customers and our own and they don''t generally fit with 3/8ths on intake. We use 11/32nds MAntons usually on that side.
You can "scootch" the head all the way to the exhaust side which might give you a few thou when you bolt the heads down and then you can "scootch" the rocker pair towards to the intake side and get another .015 or so and sometimes this can get you by.
As has been said though we have probably installed a 100 sets of these things easy from other shops and customers and our own and they don''t generally fit with 3/8ths on intake. We use 11/32nds MAntons usually on that side.
04-09-2011, 06:04 PM
#63
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04-09-2011, 10:51 PM
#65
Where is the "egg on my face" emoticon?
I need to mock up more rockers to see what's going on there, sorry to hear they rubbed.
For future reference, if you look at the large machined pushrod area from the deck side of the head, you can open the smaller pushrod hole to that entire size. I just did a pair of 265 heads with a 7/16"-3/8" single taper Manton and Jesel J2K rockers and that's what I did to get them to clear.
I need to mock up more rockers to see what's going on there, sorry to hear they rubbed.
For future reference, if you look at the large machined pushrod area from the deck side of the head, you can open the smaller pushrod hole to that entire size. I just did a pair of 265 heads with a 7/16"-3/8" single taper Manton and Jesel J2K rockers and that's what I did to get them to clear.
04-10-2011, 06:51 AM
#66
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**** happens Brian, I was one of the unlucky ones. it looked like all the intake push rods were hitting. Then you had me test it with masking tape and black marker and then realized only cylinder 5 was rubbing. I talked to Erik about running 3/8 rods on the exhaust and 11/32 on the intake side but decided to keep everything uniform and ordered 16-11/32" rods. All the help you gave me is very much appreciated.
Where is the "egg on my face" emoticon?
I need to mock up more rockers to see what's going on there, sorry to hear they rubbed.
For future reference, if you look at the large machined pushrod area from the deck side of the head, you can open the smaller pushrod hole to that entire size. I just did a pair of 265 heads with a 7/16"-3/8" single taper Manton and Jesel J2K rockers and that's what I did to get them to clear.
I need to mock up more rockers to see what's going on there, sorry to hear they rubbed.
For future reference, if you look at the large machined pushrod area from the deck side of the head, you can open the smaller pushrod hole to that entire size. I just did a pair of 265 heads with a 7/16"-3/8" single taper Manton and Jesel J2K rockers and that's what I did to get them to clear.
04-10-2011, 01:04 PM
#67
FormerVendor
Brian, I never meant to sound rude about the 3/8th pushrod deal because as you said some do fit it's just so close so that the tolerance stack up can end up on some making them rub I guess.
Thanks for being a major or even the major part of bringing these heads to the LSx community as we've had your heads on a great many engines now and they all haul ***!
Obviously it would be nice to bring that wall even further into the pushrod! We just need a slightly offset affordable intake rocker arm setup and all would be good.
Thanks for being a major or even the major part of bringing these heads to the LSx community as we've had your heads on a great many engines now and they all haul ***!
Obviously it would be nice to bring that wall even further into the pushrod! We just need a slightly offset affordable intake rocker arm setup and all would be good.
04-10-2011, 01:08 PM
#68
FormerVendor
If everything in the valvetrain is good probably all of these rockers will work just fine. I like the CHE upgraded ones the best but again so far we've never seen any issues with any on correctly setup deals at this point anyway.
