This weekend I wil start building my 496.
.060 454
GM Tufftried forged 4.0"
Eagle H beams
Ultradyne 285/295 R12
.630/.630
251/260
Comp Cams mag Roller rockers
Isky Red Zone
Victor Jr
Canfield 310's
113cc
SRP 139513
CR 10.7 to 1
Holley 4781 850DP
I am trying to decide if I should dyno or not. There is a shop here that said it would take almost a full day so plain on spending about $500.00. Is that price in line. I will be there to do tuning. There is not a chassie dyno here in town. Do y'all think my carb will be to small? A hp 950 would be nice. I would like to find a bigger carb to try on dyno along side my 850. Max RPM' should be 6800 to 7000 rpm range. Any guess what HP and TQ would be?
John

John,
If you can afford to part with the coin, I'd recommend getting your combo on the dyno. I just finished a small block & decided to throw it on the dyno & subsequently learned that the Carb was not supplying enough fuel @ w.o.t. I ended up gaining 20 HP & 30 pound ft of torque just thru Carb tuning. I live about 30 miles north of Philly & paid $600 for my dyno session, so $500 sounds pretty good to me. It was pretty much an all day thing, not to mention a very cool experience :D .

The only downside to dynoing I can see is the cost. ;)

My BBC project goes to the dyno next Friday. Money well spent, IMO.
A full day @ $500 is about right. graemlins/thumbsup.gif

What is the stroke on your crank ? :confused:

I assume thats an engine dyno. If you only wanna go to one dyno, I would think using a chassis dyno would be a better option. Cause ultimatly, its what your putting the the ground is what counts. Also, it would take only a few minutes to get setup on a chassis dyno, and then do a few runs and some tuning for a fraction of the cost. However, you wont get so many intricute sensors on a chassis dyno compared to an engine dyno. But then again, your not gonna have dyno headers on when you put it in the car. But, if you plan to dyno it again when you get it in the car, it would be cool to see how much power your losing through the drive train, exhaust, and accessories. Just my 2 cents.

It is a 4.0" crank. Yes I would like to go to a chassis dyno later. There is not one here in town.
John

468 not 496.just dreaming bigger. I was reading the post on the 496 when I started this one.

I put my 350 on a dyno. For the most part it was worth it. We tunned about 30 more hp and 20 ft/lbs tq after about 10 pulls. Don't let them hurry you or tell you something you want to try won't work. Take some notes on what you did and the result. Take your time breaking in the motor. For 450 dollars I got a tunner, the dyno service, and a sheet of paper saying my sbc makes 490 HP. It may come in handy if you ever wanted to sell your car or engine. I did have fun doing it!

Good Luck!!!

The only negative to a chasis dyno is that oil leaks are hard or impossible to correct in the car. You may wind up pulling the motor. Otherwise, a chassis dyno has always made more sense to me. Break it in on a test stand, which are cheap, and confirm no leaks; then to the chassis dyno makes sense to me. {my builder also cost me a dyno session with his crooked, maniacal ways}