When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Shortblock:
100% Stock bottom end with ~38,000 miles
Improved Racing Crank Scraper
Custom Cam 26X/27X .670 115+6
Johnson ST2126LSR lifters
Katech Red Oil Pump
ATI 10% UD Balancer
Top End:
Brodix BR7 ported by LME with 52cc chambers
PAC 1209x springs w/ titanium retainers
Stock LS7 rockers
Holley Hi Ram base - unported
ShearFab Lid
Ebay 108mm DBW TB
4.5" air intake with velocity stack
Accessories:
ARH 2x2-1/8" stepped headers with 3.5" collectors
Corsa Extreme exhaust (3")
Mezeire electric water pump
GZ motorsports vacuum pump
IGN1A Smart Coils
Dyno'd my setup a few weeks ago. Haven't done much with it since then.
It was done on a Dynocom dyno. Don't know much about it, how it compares to other local dynos around here. I do know when they were trying to calibrate the load,
it went from ~640whp @ ~6400rpm to ~619whp @ the same RPM. Whatever that's worth. They don't do much NA stuff so they didn't have the most optimal settings.
Drives pretty good for what it is.
Exhaust goes from 3.5" to 3" at the cat-back. That may be worth some power.
Other than that, happy with the results. Now just need to get data to see how that translates.
Did you ever express concerns to your engine builder about stock rockers on those heads?
thats a lot of lift for OEM rockers. I’d look into some full rollers (Jessel/TD Machine). At the very least I would get CHE bushings and monitor them for wear and valve guild wear. Not sure it would have a problem, but I do know stock LS7s have a problem with a small came
Did you ever express concerns to your engine builder about stock rockers on those heads?
thats a lot of lift for OEM rockers. I’d look into some full rollers (Jessel/TD Machine). At the very least I would get CHE bushings and monitor them for wear and valve guild wear. Not sure it would have a problem, but I do know stock LS7s have a problem with a small came
I spec’d and assembled this setup on my own. I don’t have any immediate concerns with the stock rockers and the current lift of this camshaft. Most larger aftermarket cams are .660 lift and ran on the stock rockers. I also have no concerns with the stock trunnions.
Awesome results to start off with!! Def a fun street setup!
We have had several issues with ls7 rockers breaking the tips off with similar lift as your cam. It’s def a good idea looking into better rockers. I believe tsp came out with a roller tip rocker because of this issue a couple years ago. Just something to think about
Awesome results to start off with!! Def a fun street setup!
We have had several issues with ls7 rockers breaking the tips off with similar lift as your cam. It’s def a good idea looking into better rockers. I believe tsp came out with a roller tip rocker because of this issue a couple years ago. Just something to think about
Thats the first I’ve heard of tips breaking off the stock rockers. I will keep an eye on that.
The older LPE cams were like .680” lift and had some pretty aggressive ramp rates IIRC.
I actually got rid of a set of TSP roller rockers that came on the car. Since I was planning on revving this setup high, I decided to move back to the stock rocker for weight savings over the tip. I’m running stainless valves. I didn’t want to run more spring pressure than I already am on a pedestal and wasn’t ready to go shaft mount just yet.
First you've heard of it means nothing - plenty of folks here have been watching and doing longer than you have. It's not an ego thing, it's trying to help you - you will save money upgrading those rockers over crossing your fingers and hoping. Stock rockers are fine for "normal" heads and cam upgrade but you have spent serious money and effort to get to these kickass, atypical numbers. The stress increase on the drivetrain is NOT linear, once you get north of 7k it goes up much faster. Don't cost yourself extra money on that beautiful build by shortcutting rockers.
First you've heard of it means nothing - plenty of folks here have been watching and doing longer than you have. It's not an ego thing, it's trying to help you - you will save money upgrading those rockers over crossing your fingers and hoping. Stock rockers are fine for "normal" heads and cam upgrade but you have spent serious money and effort to get to these kickass, atypical numbers. The stress increase on the drivetrain is NOT linear, once you get north of 7k it goes up much faster. Don't cost yourself extra money on that beautiful build by shortcutting rockers.
Lol. I’m not some newbie that just pulled a random setup out of my *** either. This is also not my first high revving LS7 with stock rockers. I’m also not arrogant and will consider solid advice when it’s given. I’ve contacted a few people with similar setups and none have expressed any concerns with the stock rockers nor have heard of any issues of them breaking. I try to do my due diligence before just jumping at what people say. Maybe I’m different.
Lol. I’m not some newbie that just pulled a random setup out of my *** either. This is also not my first high revving LS7 with stock rockers. I’m also not arrogant and will consider solid advice when it’s given. I’ve contacted a few people with similar setups and none have expressed any concerns with the stock rockers nor have heard of any issues of them breaking. I try to do my due diligence before just jumping at what people say. Maybe I’m different.
Crossing my fingers for you, bud, hope you didn't tempt Murphy! LOL Awesome numbers.
If a rocker did break it is about one of the lowest risk part failures you tend to just go down a cylinder. I've also never heard of factory rockers breaking off. Needle bearing failures yes, snapped rockers no. Katech said .660 lift was ok, above that gets sketchy on geometry. Questionable what impact it has on valve guide life but I don't think a build like this is shooting for 100k miles between service intervals.
I know you were shooting for 700 SAE, but that powerband is going to win races man that is sick! You're basically 95%+ peak power from 6k to 8200.
I also always thought the old baseline numbers were straight BS, so I'm sure you gained way more than what it says on paper.
If a rocker did break it is about one of the lowest risk part failures you tend to just go down a cylinder. I've also never heard of factory rockers breaking off. Needle bearing failures yes, snapped rockers no. Katech said .660 lift was ok, above that gets sketchy on geometry. Questionable what impact it has on valve guide life but I don't think a build like this is shooting for 100k miles between service intervals.
I know you were shooting for 700 SAE, but that powerband is going to win races man that is sick! You're basically 95%+ peak power from 6k to 8200.
I also always thought the old baseline numbers were straight BS, so I'm sure you gained way more than what it says on paper.
I primarily roll race so the powerband is perfect for what I'm doing. Leaving at 60mph in second is ~5800rpm and each shift will drop to ~57-5900rpm. I do plan to hit the 1/4mi and 1/2mi to see how it does there too.
07-08-2022, 06:39 AM
Sbe ls7 na 
