Which cam with stock 317 valvesprings?
Which cam with stock 317 valvesprings? Which would be safer to use with stock 371 head valvesprings an ms3 cam or a comp cam with the following specs .242/.248 .612/.615 115 lsa.
I'm trying not to buy new valvesprings if I can for at least until after new years.
I'm trying not to buy new valvesprings if I can for at least until after new years.
Joined: Aug 2007
Posts: 24,241
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From: Turnin' Wrenches Infractions: 005
You cannot safely run anything but stock cam/rockers on stock valve springs. They are crap for performance and barely hold a stock cam at stock RPMs 
thanks, yeah 180ls1 made it perfectly clear. I was hoping they could at least last from late December until the week after new years but if they can't well I guess I'll chuck up the $200 for the Patriots.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
You can get Patriot duals for around $260 I believe, PRC for closer to $300 and Lunatis for around $220 shipped. I chose the Lunati bc I like to be the Guinea pig 
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Verdad Gallardo Joined: Aug 2007
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From: Turnin' Wrenches Infractions: 005
Well, Lunati hasn't had these LS dual springs out long I don't believe. It seems like a nice well thought out kit and the reason for the cheaper price is the fact that you do not get titanium retainers. They chose a tool steel type retainer which is supposed to yield similar weights to titanium, yet be stronger and cheaper to make. On a street car I see this as a well thought out decision/trade-off for valve-train weight vs. production cost. When I was looking to buy springs, I knew I wanted duals and was going to go with the tried and true Patriots or PRCs. However, the Lunatis gained my interest. After closer inspection, they seemed to be a high quality kit made by a reputable company for a great price. As an FYI, Lunati does not MAKE these. They are subbed out by a big spring manufacturer in MI I believe. Since there was little info out there I figured what the hell. I bought them through a site sponsor through their ebay ad and got them for $220 shipped. During installation, they installed at the advertised height with no issues. I have only run this set-up for a short period on some very aggressive Cam Motion lobes and so far so good.
Well, Lunati hasn't had these LS dual springs out long I don't believe. It seems like a nice well thought out kit and the reason for the cheaper price is the fact that you do not get titanium retainers. They chose a tool steel type retainer which is supposed to yield similar weights to titanium, yet be stronger and cheaper to make. On a street car I see this as a well thought out decision/trade-off for valve-train weight vs. production cost. When I was looking to buy springs, I knew I wanted duals and was going to go with the tried and true Patriots or PRCs. However, the Lunatis gained my interest. After closer inspection, they seemed to be a high quality kit made by a reputable company for a great price. As an FYI, Lunati does not MAKE these. They are subbed out by a big spring manufacturer in MI I believe. Since there was little info out there I figured what the hell. I bought them through a site sponsor through their ebay ad and got them for $220 shipped. During installation, they installed at the advertised height with no issues. I have only run this set-up for a short period on some very aggressive Cam Motion lobes and so far so good.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
You will find that Patriot does not have a perfect track record. I believe there were issues with them installing at the wrong installed height, and if I bought them I would invest in a spring height checker to confirm this measurement. I would trust their spring but I would measure as a safety net and my own piece of mind. But, for $200 are they brand new? Bc if they weren't.......I'd spring the extra 20 for the Lunatis or 60 for NEW Patriots.
You will find that Patriot does not have a perfect track record. I believe there were issues with them installing at the wrong installed height, and if I bought them I would invest in a spring height checker to confirm this measurement. I would trust their spring but I would measure as a safety net and my own piece of mind. But, for $200 are they brand new? Bc if they weren't.......I'd spring the extra 20 for the Lunatis or 60 for NEW Patriots.
Thanks for telling me about the Lunati Valvesprings.
i should mention also that is the complete valvetrain, 1.8rr,cam,springs and push rods. deffint,its a winter 5.3 forceinduction project for my sc400 ,what im trying to get at will i get a +benefit out of the 1.8 rockers? for my bottomstock 5.3 with 317heads +75mm turbo.
TECH Fanatic
Joined: Feb 2004
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From: Lexington, KY
I don't see what cam you are planning to run. From what I have read, 1.8 rockers are not recommended for medium size and larger LS cams due to the fast ramp rate of the lobes.
Well, Lunati hasn't had these LS dual springs out long I don't believe. It seems like a nice well thought out kit and the reason for the cheaper price is the fact that you do not get titanium retainers. They chose a tool steel type retainer which is supposed to yield similar weights to titanium, yet be stronger and cheaper to make. On a street car I see this as a well thought out decision/trade-off for valve-train weight vs. production cost. When I was looking to buy springs, I knew I wanted duals and was going to go with the tried and true Patriots or PRCs. However, the Lunatis gained my interest. After closer inspection, they seemed to be a high quality kit made by a reputable company for a great price. As an FYI, Lunati does not MAKE these. They are subbed out by a big spring manufacturer in MI I believe. Since there was little info out there I figured what the hell. I bought them through a site sponsor through their ebay ad and got them for $220 shipped. During installation, they installed at the advertised height with no issues. I have only run this set-up for a short period on some very aggressive Cam Motion lobes and so far so good.
