View Full Version : Reaching higher rpm safely


LS-ONE_DAY
07-05-2012, 06:43 AM
I've been putting this off far too long since its such a newbie question, but I definitely have a cam in my future but most of the cams that make really good power make that power until 6500-7000rpm in some cases. In order to stay safe I always planned on having shift points set to 6300 to make sure there wasn't much stress on the valvetrain, including blowing the motor. But, if I did want to go with a bigger cam, and possibly heads as well, what would need to be replaced/upgraded in order to allow the engine to safely reach higher rpms, like 7,000-7,500 maybe?

Arctic2002ss
07-05-2012, 09:16 AM
You need better valve springs for higher RPMs. Those need to be upgraded along with a cam. There is no need for higher RPMs with the stock cam because it peaks around 5600. Aftermarket cams typically peak around 6300 and 6800 is a common rev limit. Over 6800 requires more parts and planning.

zracer323
07-05-2012, 09:35 AM
You don't want to spin a stock bottom end LS1 past 6800. If it is a pre-2001 new rod bolts would be a must to even reach that. I would focus on finding a cam that peaks earlier where you don't have to spin it that high.

LS-ONE_DAY
07-05-2012, 10:07 AM
I was planning on going with a 228R from texas speed 228/228 .588/.588 on a 112 LSA, maybe a 113. I think that would put me about 6100. But I may want to go with a 228/232 and a little higher lift.

I was going to get dual springs, Golds I think probably.

What are the more cost efficient/highest quality rod bolts to consider for future reference if needed?

brody slomaro
07-05-2012, 10:53 AM
that's very safe

TransAmWS.6
07-05-2012, 11:26 AM
What are the more cost efficient/highest quality rod bolts to consider for future reference if needed?

I have been reading a lot of good feedback from people on here on the ARP rod bolts

LS-ONE_DAY
07-05-2012, 11:52 AM
Yeah ARP was the only one I was aware of, I know they're pricey but they're very high quality, I don't know of any alternatives though

TransAmWS.6
07-05-2012, 12:01 PM
Also, I forgot to mention, with the ARP rod bolts I hear that you have to resize the rods which means you have to remove the motor from the car and disassemble it pretty much. A good alternative could be the Katech bolts, I hear those are very nice. Plus, you can change them in the car. However, to me it seems like it would be a good idea to just go ahead and resize the rods anyways.

1999BlueTA
07-05-2012, 02:24 PM
I'm doing a h/c/i build on my 74k mile SBE ls1 in my 99 t/a it will consist of cnc ported & milled 243's shooting for 12.1cr, 239/243 112+4 cam, ported fast & 102mm tb, flycut stock pistons/ported oil pump everything else stock on the bottom end so im thinking 7k+ shift points so i'll see how that goes!!!

Scoggin Dickey
07-05-2012, 02:37 PM
For the cam setup it sounds like you'd be running this is a non-issue, it won't make power that high.

TransamGCS
07-05-2012, 08:29 PM
Yeah ARP was the only one I was aware of, I know they're pricey but they're very high quality, I don't know of any alternatives though

Katech!! and you dont have to measure