Piston/Valve clearance w/ L92 heads
06-14-2008, 10:04 AM
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Piston/Valve clearance w/ L92 heads I posted this in the newbie section but I don't think it got enough views so I thought I would try here...
Newie question .... I am considering purchasing a fellow board members 408 crank/rods/pistons for my 6.0 block. His pistons were cut for ETP 265 heads. I had planned on running L92 CNC'd heads with the build because of the good price/high flow. I think after doing some research that ETP heads have a 11* valve angle and L92's have a 15* valve angle - so they don't match. So the question is can these pistons work w/ the L92 heads despite the difference in applications. What would I need to make these work as is? The set is already balanced but could the piston tops be re-machined (without re-balancing) Thanks.
Newie question .... I am considering purchasing a fellow board members 408 crank/rods/pistons for my 6.0 block. His pistons were cut for ETP 265 heads. I had planned on running L92 CNC'd heads with the build because of the good price/high flow. I think after doing some research that ETP heads have a 11* valve angle and L92's have a 15* valve angle - so they don't match. So the question is can these pistons work w/ the L92 heads despite the difference in applications. What would I need to make these work as is? The set is already balanced but could the piston tops be re-machined (without re-balancing) Thanks.
06-14-2008, 12:47 PM
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Don't really know how much they are milled but he was running about 13.5:1 compression with his ETP heads and a 50cc chamber. Does this help give any idea of how much they are milled. I think I can get chamber size options from 72-67cc on the L92 heads from TS and would like to run about 11:1. This is about all I know about the combo he is selling. Thanks.
06-14-2008, 10:39 PM
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Must be running a smaller cam then me. My .640 lift cam PTV was too close. They're going to Diamond to get flycut for the L92 heads as we speak. Same pistons as yours.
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06-16-2008, 10:08 AM
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Thanks for all of the info. To complicate things further the L92 valves are larger than the ETP head valves. So, lets assume I had totaly flat headed pistons, stock gasket, stock L92 heads... What would I need to look for in a cam to make this combo work? If someone knows this then even if the pistons are fly cut to the wrong size valves/angle it wouldn't matter. I suppose buying it, putting it together, and measuring it is the only way to find out unless someone is running this combination.
One more question: If I had to have the piston tops re-milled for L-92's and they took the same amount off each piston top it should maintain balance - correct? Can a machine shop be that accurate (remember I am a newb learning)?
One more question: If I had to have the piston tops re-milled for L-92's and they took the same amount off each piston top it should maintain balance - correct? Can a machine shop be that accurate (remember I am a newb learning)?
06-16-2008, 11:56 AM
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Determining deck height would have to be after it is together I suppose. The crank is a 4" stroke for a 408 w/ 6.125" rods and diamond flat-top pistons. I think I just need to put the thing together and work through any problems as I go. Thanks for all the help.
06-16-2008, 01:04 PM
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Don't really know how much they are milled but he was running about 13.5:1 compression with his ETP heads and a 50cc chamber. Does this help give any idea of how much they are milled. I think I can get chamber size options from 72-67cc on the L92 heads from TS and would like to run about 11:1. This is about all I know about the combo he is selling. Thanks.
