ms3 in lm7?
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ms3 in lm7? will the ms3 work in an lm7? i've been looking at the kit from TSP. i've done a lot of searches and haven't found what i'm looking for. this will be going in a 94 camaro, mostly drag, some street, not my daily. is there a better choice for a drag car? what else would be needed for a cam swap for this engine? i will be using ls6 intake, longtubes, and a big stall.
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From: Schiller Park (NW burb of Chicago)
even then, i agree that it might be too big...a lot of the trucks on performancetrucks.net and the old GMfullsize.com don't run big cams in the 5.3...They usually recommend durations between 212-218...Many run a 220/220 with a 224/224 being the biggest. I think I saw one guy running a 228 cam, but that was consided really big...I know this isn't a truck, but it is the motor...
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I wouldn't put the MS3 or any large cam in a 5.3. You will loose all bottom end torque unless you bring the static compression up really high. Bringing the compression up to an acceptable level would require the use of flat top or dome pistons with valve reliefs, milling the heads at least 0.030, and an 0.040 gasket. Since no one stocks aftermarket pistons for the 3.779 bore it's alot easier to stick with a cam with less than 230 duration.
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losing low end torque isn't really a concern, it's pretty much a lightweight race car that will have a 4000+ stall and 4.10's so it will be into the powerband very quickly. the heads will be milled, how much i'm not sure yet. hopefully shift points will be 6500-6700 rpm.
i know the 243's flow better than the 5.3's, but i'm assuming that putting them on a 5.3 would cause intake valve shrouding due to the much larger valve. i am considering just using the ls6 cam for now and eventually get a custom cam when i get the heads ported.
i'm just trying to figure out the best cam to use. i figured the ms3 was too big. i'm used to mustangs having major ptv issues with most cams and want to make sure i don't go to big.
the truck comparison doesn't really apply, sure it's the same engine but there is a 2000 pound difference, the truck needs a lot more low end than my car.
sorry for the long post, just trying to get the best info possible
i know the 243's flow better than the 5.3's, but i'm assuming that putting them on a 5.3 would cause intake valve shrouding due to the much larger valve. i am considering just using the ls6 cam for now and eventually get a custom cam when i get the heads ported.
i'm just trying to figure out the best cam to use. i figured the ms3 was too big. i'm used to mustangs having major ptv issues with most cams and want to make sure i don't go to big.
the truck comparison doesn't really apply, sure it's the same engine but there is a 2000 pound difference, the truck needs a lot more low end than my car.
sorry for the long post, just trying to get the best info possible
that engine is essentially an sbc 327cid engine with much better internals, etc. i wouldn't be afraid of the ms3. i think because of the smaller cubes it would easily push the powerband up into the 6,500-7,200 rpm range. if it will physically fit in the engine with the heads, etc you want - go for it. i would also opt for a larger stall, maybe 4400+. as a 4k stall would be about right for a 346 cid engine, but using a smaller engine will merit using a larger stall. you can ALWAYS switch to a larger stall to compensate for the large cam. DO IT.
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that engine is essentially an sbc 327cid engine with much better internals, etc. i wouldn't be afraid of the ms3. i think because of the smaller cubes it would easily push the powerband up into the 6,500-7,200 rpm range. if it will physically fit in the engine with the heads, etc you want - go for it. i would also opt for a larger stall, maybe 4400+. as a 4k stall would be about right for a 346 cid engine, but using a smaller engine will merit using a larger stall. you can ALWAYS switch to a larger stall to compensate for the large cam. DO IT.
pretty much exactly what i was thinking, probably using the yank pt4600 or ut4800
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the 224 is a very mild cam and i'm sure it works well in mild street driven setups, but i don't care about streetability, i just want it to go down the track fast. the f13 has much better specs and is actually a possibility for me. has anyone swapped a fairly large cam into a 5.3? i've heard that 241's and 5.3 heads flow similarly and if that's true the ms3 shouldn't be too much for the heads, the only issue would be that it might peak too high which is what i'm mostly concerned about. where does the ms3 peak in an ls1? where would it peak in an lm7?