OEM valve spacing ??
OEM valve spacing ?? Like the title says......
Looking for the GEN differences in valve spacing.
LS1 = ??
LS3 = ??
LS7 = ??
Where I'm going with this is.....could I make a "porter" casting LS7 fit on a 3.90" bore (obviously a smaller valve % throat....etc)...??
For the info I've been able to gather, it seems the LS7 intake valve is moved roughly 0.050" towards the intake...but still maintains the same center (forward & aft) as the LS1 valve spacing.
Any help would be appreciated.
.
Looking for the GEN differences in valve spacing.
LS1 = ??
LS3 = ??
LS7 = ??
Where I'm going with this is.....could I make a "porter" casting LS7 fit on a 3.90" bore (obviously a smaller valve % throat....etc)...??
For the info I've been able to gather, it seems the LS7 intake valve is moved roughly 0.050" towards the intake...but still maintains the same center (forward & aft) as the LS1 valve spacing.
Any help would be appreciated.
.
Last edited by LSOHOLIC; Jan 25, 2016 at 12:36 PM.
LS1 = 1.91"
LS7 = 1.97"
LS3 = 2.01"
The LS1 and LS3 intake valves seem to have the same location in reference to the bore, but the LS3 exhaust valve is moved out more toward the bore, giving it the wide valve spacing.
The LS7 is narrower, but both valves have been moved over so that the intake is further from the bore and the exhaust valve is closer.
LS7 = 1.97"
LS3 = 2.01"
The LS1 and LS3 intake valves seem to have the same location in reference to the bore, but the LS3 exhaust valve is moved out more toward the bore, giving it the wide valve spacing.
The LS7 is narrower, but both valves have been moved over so that the intake is further from the bore and the exhaust valve is closer.
LS1 = 1.91"
LS7 = 1.97"
LS3 = 2.01"
The LS1 and LS3 intake valves seem to have the same location in reference to the bore, but the LS3 exhaust valve is moved out more toward the bore, giving it the wide valve spacing.
The LS7 is narrower, but both valves have been moved over so that the intake is further from the bore and the exhaust valve is closer.
LS7 = 1.97"
LS3 = 2.01"
The LS1 and LS3 intake valves seem to have the same location in reference to the bore, but the LS3 exhaust valve is moved out more toward the bore, giving it the wide valve spacing.
The LS7 is narrower, but both valves have been moved over so that the intake is further from the bore and the exhaust valve is closer.
I'm trying to do a layout to check valve sizes of different heads in different bore sizes. With this I'd like to compare the shrouding of different examples to see if there is any corelation between engine styles and the perceived need for big cam splits to crutch another issue.
Thanks,
Cole
Do you know if the valve centers are "in-line" with the center of the bore or offset up or down from the bore center?
I'm trying to do a layout to check valve sizes of different heads in different bore sizes. With this I'd like to compare the shrouding of different examples to see if there is any corelation between engine styles and the perceived need for big cam splits to crutch another issue.
Thanks,
Cole
I'm trying to do a layout to check valve sizes of different heads in different bore sizes. With this I'd like to compare the shrouding of different examples to see if there is any corelation between engine styles and the perceived need for big cam splits to crutch another issue.
Thanks,
Cole
For example, EQ just released a cathedral port casting with the pierce points at (.830", .011") intake and (1.080", .011") exhaust. It looks as if these pierce points are basically X & Y coordinates from the bore center.
