ms4 ?
02-23-2010, 06:48 PM
#1
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ms4 ? if im runnin the ms4 cam in an ls1 with 243s can i use stock rocker arms and lifterss need help and why do they say u have to use the tsp ls6 ported oil pump?
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02-23-2010, 08:16 PM
#8
I am on stock injectors, but they are a ticking time bomb. Don't remember the exact duty cycle when I got it tuned, but before I add anything else, or just as soon as I can afford a re-tune, new injectors and figure out my next move, injectors will be added.
02-23-2010, 10:00 PM
#9
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i was told by a tuner that stock injectors hold up to around 400rwhp and i know from tsp that an ms4 should be 430rwhp. had wondered what you guys experienced. injectors add alotta cost.
02-24-2010, 09:47 PM
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MS4 w/ 243s here..I broke a few rockers..so I went to yellaterras. Some say they will work some say replace them. Try it and see I guess. 42#ers are a must!! Leans out up top and there goes your motor...While your in there you might as well get LS2 chain, oil pump..Im ganna vote yes on, Ported.. Dont need it but doesnt hurt.
02-24-2010, 11:26 PM
#14
You can use stock rockers and lifters. If your budget allows i would upgrade both. The MS4 has aggressive lobes which is hard on valvetrain components. Im running a MS4 on a 112LSA with stock rockers and lifters. I would definitely upgrade injectors since you'll be somewhere around 90% duty cycle with stock injectors, which isnt good for the injectors or injector drivers in the PCM. As far as the oil pump, an LS6 oil pump ported or unported would be a good choice.
02-27-2010, 09:50 AM
#16
problem with the yella terras is weight, we have ran several cars with close to or the same cam as a ms4 and always go back to the stockers with upgraded bearings. unless you set the valve train up specifically with the yella terras in mind you are likely leaving a few rpms on the table due to valve float. we do the bearing upgrade here for 255.00
02-27-2010, 10:36 PM
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problem with the yella terras is weight, we have ran several cars with close to or the same cam as a ms4 and always go back to the stockers with upgraded bearings. unless you set the valve train up specifically with the yella terras in mind you are likely leaving a few rpms on the table due to valve float. we do the bearing upgrade here for 255.00
