LS7 Stock Valve Weights
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From: Little Rhody
LS7 Stock Valve Weights The LS7 is running higher ratio rockers yet the spring loads are not exorbinant. Does anyone know what the weight of the valves are or has anyone measured them?
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Originally Posted by Ferocity02
I've yet to see somone put down $1000+ for the set of Ti valves.
Actually, IMHO too much money is spent on cranks and bottom-end stuff here where there is really never a report of a rod or crank breaking, and little on the valvetrain where the revs are like adding displacement.
I got the GM valves both intake (ti)/exhaust (note exhaust are sodium filled hollow stem stainless), springs, locators, retainers, and keys for $1200. Also need lash caps, which are ~$90.
They are due to ship out today, and I will weigh them asap.
They are due to ship out today, and I will weigh them asap.
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Originally Posted by Greg Fell
I got the GM valves both intake (ti)/exhaust (note exhaust are sodium filled hollow stem stainless), springs, locators, retainers, and keys for $1200. Also need lash caps, which are ~$90.
They are due to ship out today, and I will weigh them asap.
They are due to ship out today, and I will weigh them asap.
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From: Little Rhody
That's why I wanted to find out the weight of the valves, the spring seat pressure is 101# per another post here. With 1.8 rockers, they had to get the weight out somewhere.
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Just for the record, the Boss 302 had 2.21 intakes in '69 and 2.19s in '70 (I had a '70, purchased new in '71). They were steel.
The Ti was necessary to get a 2.2 valve to do 7000rpm and have the valvetrain and springs last for a production car duty cycle (never opened for 150k miles).
The Ti was necessary to get a 2.2 valve to do 7000rpm and have the valvetrain and springs last for a production car duty cycle (never opened for 150k miles).
I don't really understand what the rocker ratio has to do with it. With a production cam, the ramp rates will be very soft. That along with titanium/sodium filled valves, there is no need for heavy pressures.
Originally Posted by Miles in Florida
I'm surprised to hear you are using the valve springs, because usually GM springs aren't sufficient seat pressure or max lift for an aftermarket cam. Of course, the stock LS7 cam is a lot bigger than most stock cams are. What cam are you using?
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From: Little Rhody
Originally Posted by Beast96Z
I don't really understand what the rocker ratio has to do with it. With a production cam, the ramp rates will be very soft. That along with titanium/sodium filled valves, there is no need for heavy pressures.
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Originally Posted by Greg Fell
I said I bought springs, never said GM springs.
Originally Posted by vettenuts
The lift is at or over 0.600 and the 1.8's will accelerate the valve faster so you either have to go up in pressure (which transmits more load to the lifter) or you need to lighten the valve to that the acceleration levels will keep up with the cam lobe. 7K is pretty high RPM, so GM obviously lightened up the valves. I think it would be interesting to compare these weights to those of the LS6 valves and the stock LS1/LS2 valves.
