Cam advice on 98 LS1
#1
Cam advice on 98 LS1
Hello all - I'm new to this forum and I'm seeking some advice. I'm getting ready to do a H/C conversion on my 98 Vette. I'd like to go with a fairly aggressive cam (not a daily driver but is a purely street car), but I'm concerned with the rev. capability of the 98 block. The bigger cams (high 230's and upper .500's) give the bigger power band in the higher revs, but since the block doesn't have the cutouts in the bulkhead for bay-to-bay breathing to reduce windage and the fact that the con rod bolts are not the best I'm very concerned with running in the higher power band. I really don't want to go into the bottom end to replace rod bolts or change blocks. How many of you guys are running the older blocks (pre 2000 I believe) with the bigger cams? Experience any problems?
Thanks,
Sean
Thanks,
Sean
#2
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I don't think the blocks are a big problem, but the rod bolts are the limiting factor. I think as long as you stay under 6600 rpm you'll be fine. I think you'll be good to go with anything under mid 230's duration. I went w/ a 233/233 for my 98.
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Get a new "LS6" oil pump. Up until either 00 or 01 the oil pumps are known to just take a crap. I wouldn't rev higher than ~6,600. I have a large cam with redline at 6,800 and shift points (A4) at 6,500. I will eventually have new internal parts, but until then the revs will be kept relatively low.
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Originally Posted by ChucksZ06
No such thing as an ls6 pump. Right....
#12
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I have a farily larg cam in my 98 and no tuning right now. So it only revs to 6200, but I've had the cam for over 10k miles with no problems and quite a bit of reving of the motor was involved!
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I run my 98z to 6850 with the stock oil pump & rod bolts will no issues so far (numerous passes 50+). Granit it's an auto & the shift's are programed so the RPM's don't ballon like a M6 between gear's. But for peace of mine if you in there, go ahead and change them.
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Originally Posted by Lvmyz28
I have a farily larg cam in my 98 and no tuning right now. So it only revs to 6200, but I've had the cam for over 10k miles with no problems and quite a bit of reving of the motor was involved!
What size cam you runnin" ?
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I have a 235/240 cam in my car right now and dont know how many times its pushed through a shift on a nitrous pass and nailed the 6900 rpm rev limiter and everything has held together this far
the car is a 98' with 105,000 miles on it
the car is a 98' with 105,000 miles on it
#17
Wow. That's pushing it. I work for a supplier and we've killed a couple motors already from failures due to the stock rod bolts. We've also killed a couple of LS6s due to broken valve springs so I'll definitely be going to Comp or someone else. I'll probably stay conservative and keep the peak around 6k or so.