Those of you with MS4's...
Thread Starter
Joined: Feb 2007
Posts: 55
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From: Oklahoma City, OK
Those of you with MS4's... What kind of valve springs are you guys using? I ordered a head and cam package from TSP 2 weeks ago and it's coming with PRC Dual Valve Springs. Should I have them swapped out if it isn't too late?
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On The Tree
Joined: Aug 2006
Posts: 122
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From: jacksonville NC
I know this is a one in a million shot of operator error, but, Im running comp 921 behive springs and have less than 1000 miles on them and broke one recently. I figured I didnt let it warm up properly. I just ordered the Patriot Gold Duel Springs.
The Comp srings were rated at .650 but the MS4 is rated at .651. The Patriot springs are rated the same but I dont have an extra 200$ for the springs rated at .660.
The Comp srings were rated at .650 but the MS4 is rated at .651. The Patriot springs are rated the same but I dont have an extra 200$ for the springs rated at .660.
I know this is a one in a million shot of operator error, but, Im running comp 921 behive springs and have less than 1000 miles on them and broke one recently. I figured I didnt let it warm up properly. I just ordered the Patriot Gold Duel Springs.
The Comp srings were rated at .650 but the MS4 is rated at .651. The Patriot springs are rated the same but I dont have an extra 200$ for the springs rated at .660.
The Comp srings were rated at .650 but the MS4 is rated at .651. The Patriot springs are rated the same but I dont have an extra 200$ for the springs rated at .660.
If you had beehives, they were probably 918s, and those will not tolerate a hi-lift cam like the MS4.
sig material! Thread Starter
Joined: Feb 2007
Posts: 55
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From: Oklahoma City, OK
Well, the parts came in today. Everything looks great! I'm starting to think about running a forged 402 or 408 instead of my original 347 idea since I can't find an ls1 shortblock anywhere around here. Anyone daily drive a 402/408? Does anyone have experience with Scoggin Dickey's 402 rotating assembly? http://www.sdparts.com/product/LS2RA...gAssembly.aspx
I daily drive my 408 with the ms4 and in the rare ocassion that i do drive it nice i get about 15 in town. The ms4 does surge quit a bit though and is hard to drive at certain rpms. It is a ton-o-fun though
If you are looking for a 347 short-block, we have several on the shelf. We also have both aluminum 402 and iron 408 motors on the shelf as well.
On the cam surging, most of that can be tuned out. At extremely low RPM's, yes there will be some. That is just the nature of big cam. However, in a 408c.i. motor, the cam should drive pretty well. I had a 257/266 in my 408 stroker and I could use my remote start and the car would fire every time and immediately find an idle w/ no surging. There is no reason a MS4 can not do the same.
Let me know if you have any questions or concerns and we'll get you fixed up right away!
Jon
On the cam surging, most of that can be tuned out. At extremely low RPM's, yes there will be some. That is just the nature of big cam. However, in a 408c.i. motor, the cam should drive pretty well. I had a 257/266 in my 408 stroker and I could use my remote start and the car would fire every time and immediately find an idle w/ no surging. There is no reason a MS4 can not do the same.
Let me know if you have any questions or concerns and we'll get you fixed up right away!
Jon
Thread Starter
Joined: Feb 2007
Posts: 55
Likes: 0
From: Oklahoma City, OK
I don't really have enough for a 408 right now, I'm still trying to save up some more. What is your opinion on the oil consumption and premature piston skirt-wear problem they are talking about in this thread? https://ls1tech.com/forums/generatio...rs-come-2.html Are those common issues?
With a properly machined block, you really shouldn't have a problem. I think the biggest part of his problem is the fact that it is a new motor and the rings weren't properly seated yet and there wasn't proper breathing on the motor. Piston skirts typically don't have a problem with the proper side wall clearance. If the machine shop doing the work doesn't have proper side wall clearance I could see it hurting a piston.
Jon
Jon
