650+HP BBc

[EZ Nova]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Stefano</div><div class="ubbcode-body">As someone who builds engines on a regular basis, those are extremely impressive numbers on an engine dyno. However, engine Dynos are not very comparable from one brand or set up to another.

I have seen engine Dynos vary as much as 20%

An engine with the specs you posted would dominate various &quot;class&quot; racing venues.

I am curious as to the racing applications your engines have been used and your results against the competition.

Again, very impressive numbers! </div></div>

Stefano, usually cars run very well when there class engine from the shop. There is a certain Z06 Vette that is NA and has run 141 MPH. Car actually picks up more MPH from the 1/8 to 1/4 then most comparable forced induction cars. Infact, he won a race in the finals over a twin turbo Z06 by running him down in the top end.

[VintageMusclecar]

To put this in comparison, Mark Jones' 700 HP <span style="font-weight: bold">496</span> <span style="text-decoration: underline">oval port</span> motors are only making 675 lb.ft of torque, which is 1.36 lb.ft per cubic inch. Mark is arguably one of the best Big Block Chevy builders in the country, and his engines back the dyno #'s up at the track (when the car they reside in is dialed in of course).

Sorry, but 730 lb.ft out of a 468 at only 4800 rpm on pump gas is more than a little hard to believe. I would be looking VERY hard at the dyno calibration.

Here's a little something to consider from an elite engine builder, Darin Morgan of Reher &amp; Morrison:

From Yellowbullet:

<span style="font-style: italic">&quot;I have looked through this thread and never saw an answer to your question regarding MAX ft/lbs per-cid. For gasoline engines the max is 1.67ft/lbs per-cid. If anyone tells you they are making more, they are fibbing to you. That equates to about 120% to 124% volumetric efficiency &quot; Trapped&quot; which is where Pro Stock and Comp engines have been at for the last 20+ years. P/S and Comp engines all make about 1.65ft/lbs per-cid. The game is to raise that peak TQ to higher an higher engine speeds creating more HP.

Here is another fact. A good engine will only fall 50ft/lbs from peak TQ to peak power. Bracket engines that make about 1.45ft/lbs per-cid all fall about 60 ft/lbs from Tq peak to power peak over there power band. If they fall more than that it indicates a problem in the tuning or the engines design or combination.'</span>

Link to post

Link to thread

Not trying to be a dick, but the numbers just do not add up (no pun intended).

[EZ Nova]

Your RIGHT. The dyno sheet is being sent over. This is a customer's motor. Mine will be a bit more than this. BUT IT'S MINE AND IF THE &quot;052&quot; ZL-1 BLOCK WILL HOLD IT, it should make substantially more Hp and a bit more tq.

Now guys want to talk about VE (Volumetric Efficiency), well my OTHER motor is just over 120 V.E. It's under 500 C.I. and DID make 1274Hp and 824Tq. As you can see, we too can make power.




YES I too know Mark Jones and have spoken too him on a few occasions. Mark does well with those 496 combo's. We too have 496's that not only make over 700hp, but have run couple thousand miles all the while getting some fuel economy. But we use sq port OEM heads and OEM intakes.

[VintageMusclecar]

Just out of curiosity, do you have the observed (uncorrected) dyno sheet available? If not, do you know what the correction factor was?

Looks like you still have some power left on the table as well--that oil pressure fluctuation is a dead give-away there's some windage issues. What pan was on it?

[EZ Nova]

We are looking at another Moroso pan for my ZL-1. This was just a run-of-the-mill pan the guy had laying around, might have been stock. I don't know all the particulars on this engine but it did come out of the same shop.

hoping to get mine done and dyno'ed soon.

[DW31S]

Not exactly sure on ALL of the numbers, but a good friend has a Tilburg (sp) BBC with oval port heads and cast iron intake. Made north of 740hp with headers on the dyno. He runs with extrude honed exhaust manifolds through full exhaust in a nostalgia series that requires that equipment. Like I said, not sure of all the numbers, but I did remember two.......the horsepower and the cost. It wasn't cheap.....

[EZ Nova]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DW31S</div><div class="ubbcode-body">Not exactly sure on ALL of the numbers, but a good friend has a Tilburg (sp) BBC with oval port heads and cast iron intake. Made north of 740hp with headers on the dyno. He runs with extrude honed exhaust manifolds through full exhaust in a nostalgia series that requires that equipment. Like I said, not sure of all the numbers, but I did remember two.......the horsepower and the cost. It wasn't cheap..... </div></div>

Like to more on this motor with steel heads and cast iron intake. Might be time for some work on that stuff for people too as those are really good numbers

[EZ Nova]

Just an update. This 468 has now run in the 9's at 3600 lbs. Dyno must be off a little???

[cook_dw]

lol

[EZ Nova]

update on my ZL-1 motor:

https://www.yenko.net/ubbthreads/ubbthrea...it-w#Post665434

Motor STILL hasnt &quot;RAN&quot; past 65/6600RPM on the dyno as needs MORE carb. But we have seen a corrected factor of 776@6500RPM. Design to run upto 7100RPM.

Still oping to see 830+Hp if the stars all align!!!! Not to shabby for a OEM looking 1969 ZL-1??