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Cam only C5 Z06 makes 440 SAE on two different dyno's
STD(standard uncorrected) numbers were 452/440 Temp was around 67 degrees with 39% humidity(looow for the deep south)
Cars mods:
Fresh engine with 400 miles on it.
If not noted below, it's stock or stock replacement:
Mahle pistons
Eagle I beam rods
Heads milled to 59CC for 11 to 1 compression
VMax CNC ported throttle body
PAC 1218X valve springs
7.350 restricted push rods from Schwanke engines
LG Superpro headers and catless X pipe
Vararam intake
Cam is from Geoff@EPS(Engine Power Systems)
228/236@.050, .604/.604 lift, LSA is 111+1
Car is a ball to drive, it runs hard.
Idle vid, first start untuned. I think I put my finger over the mic on the phone for a sec is why it sounded muffled for a few seconds
I put it on a different dyno today because I thought the numbers were a tad high, I was proven wrong.
The first sheet (440/430) was on a new Dynojet that the RPM was taken from the drum itself because the inductive RPM pickup on the #1 plug was not working well.
Today I put it on an older dyno that pulled RPM from the #1 plug, torque dropped but the power was still there.
Last edited by FASTFATBOY; 03-10-2017 at 04:36 PM.
I put it on a different dyno today because I thought the numbers were a tad high, I was proven wrong.
The first sheet (440/430) was on a new Dynojet that the RPM was taken from the drum itself because the inductive RPM pickup on the #1 plug was not working well.
Today I put it on an older dyno that pulled RPM from the #1 plug, torque dropped but the power was still there.
Go figure. Big numbers I would have assumed 420whp. But you ran two dyno's with similar results... I'm interested to see if you will track it.
So milling the heads, new pistones and rods, long tube headers and CAI is cam only?
I think those numbers are pretty much in the ball park. I have similar mods and similar numbers with a smaller cam.
Cam only is slang for all boltons plus camshaft. So one should assume the car has all boltons.
Nice power FASTFATBOY. 450 Is pretty good with stock ports, but that cam and boltons probably won't make the same power if you installed it in a stock motor. Different rings and hone could pickup a lot by themselves.
I'd say it certainly would be considered cam only. The short block, built for a street/roadrace application is no slicker that's stock. The good rods/pistons are really not worth anything and may be a tick heavier. Milling the heads to a. Umber that is still within GM's serviceability window isn't going to do much. They're not angle milled .120, they're probably cut .028-.032. Which any shop would do if you had a set of factory heads "freshened", especially if it had a blown head gasket issue. At most he can now run less timing and needs more fuel. The difference it makes is within the margin of error of why the dyno reads.
Some folks LK's buy into the "so and so big name tuner makes the most power with this proprietary camshaft" and can't stand it when someone with some engine knowledge beats the "pros" at their game......for a far cry less money in most cases.
Rock on FASTFATBOY, wave at the haters in the mirror.
and take this from someone who races NHRA stock eliminator and knows what stock is and what actual benefits individual mods make.
Something else I just thought of. Most aftermarket pistons have a valve relief. Did yours? How much was it cc wise?
most are 4-5cc. GM nominally calls the 243 head a 64cc chamber. So if you milled to 59cc and your pistons have a 4cc valve relief you managed a net compression increase equal to 1cc? Yea that's the explaination for the extra power 🙄🙄🙄🙄🙄🙄🙄🙄
Something else I just thought of. Most aftermarket pistons have a valve relief. Did yours? How much was it cc wise?
most are 4-5cc. GM nominally calls the 243 head a 64cc chamber. So if you milled to 59cc and your pistons have a 4cc valve relief you managed a net compression increase equal to 1cc? Yea that's the explaination for the extra power 🙄🙄🙄🙄🙄🙄🙄🙄
Buncha check writers.
If you don't think you can find power in the bottom of a motor YOU are the check writer.
I absolutely can, I do. But I don't go looking for it road race applications and neither does anyone with any sense. It's like building an offshore powerboat motor. Bulletproof matters more than raw numbers. Keep writing checks and I'll keep making horsepower. PS look up the rules for NHRA stock eliminator, then look up the performance. I'll give the short version. Stock heads, stock lift cam, blueprinted short block (better parts, stock dimensions), no power adders. The fastest C5 LS1 is a nine second car. Like I said, keep writing checks.
Nice NUMBERS! I love it when people argue over dyno numbers. There hasn't been this much action around here since the season ended. My impression of a dyno is that they are a "tuning device" and can be used to see what the actual gain of the mods were/are before and after the tune and the addition of a supporting mod.
I'd love to see what it runs in the quarter mile especially what it's mph is. I read it's a road race car and would probably not see any quarter mile tracks but in case you ever do please stop by the sticky at the top of the page and see how you compare. We would be in the same category "Internal Engine Modifications - Head/cam -> 346 " with you putting down about as much rwhp as I do. Unfortunately we do not have a "cam only category". Actually, you have higher numbers but what the heck, they are only numbers. The real number to me is how well it 60 foots and what it will run in the 1/4 or 1/2 mile.
The term cam only has been tossed around for a long time and seems used loosely used but as we all know adding just a cam is a waste without supporting mods. What do I know, I wrote the check because I'm dumb and stupid for not perusing a career in auto mechanics.
03-08-2017, 08:49 PM
Cam only C5 Z06 makes 440 SAE on two different dyno's
Temp was around 67 degrees with 39% humidity(looow for the deep south)
My impression of a dyno is that they are a "tuning device" and can be used to see what the actual gain of the mods were/are before and after the tune and the addition of a supporting mod. 
