I did a search and couldn't find exactly what I was looking for. I got a 496 to use this year. Its pretty slow for what is supposed to be in it. It broke 2 valve springs last outting and i'm going to take it out to go through it. I'm thinkin the cam is way off and the springs are probably gone is some of the problem.
Would some of you folks give your combos, what they are in, and what they run?

Thanks

what heads are on yours?

I believe they are BB2s that have been worked. That is atleast what I was told when I got the motor.

put it on alky and call bullet for a cam. 9" 150+ s100, 4.30 gear, 32x14 tire, 2850lbs 8.80's@150 1/4 at 6900 RPM

We had a 488 and 496 we ran for many years (1989-2000) and found it to be a great powerplant.....of corse once the "big" motors came along they fell out of favor just because parts became so cheap and easy to get. Our last incarnation of the 496 we ran from 1993-2000, it had the Brodix "Big Brodie" -2 heads and the Lunati 50225 cam (.722/.722 lift 316/320 advertised duration). We had the K-motion springs (K-950's I think) since they fit our 1.55 diameter spring pocket. It made good power and we could go a few hundred runs on the springs (would check them every race, and replace when seat pressure fell below 210) The motor ran 7.80's in almost any Ks weather at 166 ish in a 1800 lbs hardtale dragster with 4.10 gears (1.76 powerglide). The first few years we ran a single 1050 domintor carb (unmodified) and after that went to a duel toilet set-up. The ET picked up a tenth and a half (high 7.90's to low 7.80's) with the injection but we mainly did it because we were not running a radiator on that car and liked the cooling effects of alcohol. Not sure it there is any other info you're wanting, let me know, it worked well for us but there are lots of ways to skin that cat.

7.80's at 172. 1960lbs swing arm dragster, 13 to 1, bb2 extra, lunati 50210.

Are you guys using 2 bolt blocks or 4 blocks??

Our last one was a 2 bolt, at the time we built it 4 bolts were scarse around here and nobody was making aftermarket 4 bolt bbc's yet. Lasted 7 years, died because a roller lifter failed and cam pushed the roller through the lifter bore into the cylender and the piston hit it and turned sideways into the next cylender. We lost everything but the intake, even split one of the valve covers, and when the crank came apart from all that it busted the trans case in half.....basically the worst case scenerio....but was not the 2 bolt mains that let go.

We have a 496 in a 2800 pound firebird. It had 280cc bb2 on it and ran 5.80s. Those heads were sold and we wanted to race it so we threw on some 380 cc darts that we had expecting it to slow down. It went 5.44 this weekend!?

quote:

Originally posted by Nhrakat:
We have a 496 in a 2800 pound firebird. It had 280cc bb2 on it and ran 5.80s. Those heads were sold and we wanted to race it so we threw on some 380 cc darts that we had expecting it to slow down. It went 5.44 this weekend!?

This is with how much spray?

quote:

2800 lbs 5.44

That would take a 920+hp 496, haven't seen any of those around.

I know my 548 motivated Camaro wieghed in at 2850 and went mid to high 5.40s and it made a TRUE 940 on a conservative dyno. The 380 heads are made for a 4.50 bore so the valves had to be shrouded pretty bad on a 4.310 bore.

no spray.....come to edgewater this week and you can witness it.Also understand the air was 700 ft and track was killer. On saturday the car was running 5.51. I have been in this game awhile and am not foolish enough to think that this engine is making 940hp! I aint gonna get in a pissin match here! Have a good day!

This message has been edited. Last edited by: Nhrakat,

I've always found/seen the big head works well on the 468-496

My point was that sometimes combinations that dont work on paper seem to surprise you sometimes.

quote:

Originally posted by Nhrakat:
My point was that sometimes combinations that dont work on paper seem to surprise you sometimes.

Isnt that the truth Good luck @ edgewater

Here's some more reading if you're interested.

http://drr.infopop.cc/eve/foru...=599100841#599100841

NHRAkat,
I wasn't trying to get in a pissing match with you, just saying it takes about 940 to run those kinds of numbers at 2850. If you have a ton of gear and zing the motor there is probably a little bit there. My 820hp 496 ran mid 5.60's at 2800 lbs, 4.30 gear and P/G, it was stout, BB2X-tra cnc on alky, Ran awesome. I just think it would take a ton more to get to the mid 5.40's, I might be wrong, but every calculator states it takes more than 900 unless you are running a 3 speed and about a 5.13- 5.43 gear, then 830 or so would get you into the 40's

I had a 477ci. with dart 360's cnc's with port work in a dragster 1940lbs. went consistant 7.70's a 470ci.w/dart 345's went 7.81@171 & 7.76@170w/360's (same car) and a 496ci.with the dart 360's 7.59@174 all on alky & single rons toilet..... I kept Getting people telling me the car will go faster with the smaller head..Not!!! The smaller head would 60' harder & the bigger heads would E.T. but stayed 1 or 2 mph slower, But were all deadly consistant...

Advice with a big head on smaller cubic inch motors is not to get outragous the camshaft..

the 477 w/360's had a .714/714 roller
the 470 had a 714/748
and the 496 has a .748/.782 custom ground.

with a big head camshaft selection is very important!! a huge lift & duration with a head that moves alot of volume on a small cubic inch motor will indeed slow the car down...But with the proper camshaft & valve timing to create the right amount of cylinder pressure, will run as good as any or better!!!

quote:

Originally posted by The Bozman:
NHRAkat,
I wasn't trying to get in a pissing match with you, just saying it takes about 940 to run those kinds of numbers at 2850. If you have a ton of gear and zing the motor there is probably a little bit there. My 820hp 496 ran mid 5.60's at 2800 lbs, 4.30 gear and P/G, it was stout, BB2X-tra cnc on alky, Ran awesome. I just think it would take a ton more to get to the mid 5.40's, I might be wrong, but every calculator states it takes more than 900 unless you are running a 3 speed and about a 5.13- 5.43 gear, then 830 or so would get you into the 40's

Its all good! Maybe the scale was wrong! I do know its a 496 inderle injected dart 360 headed bbc. We shifted at 6800 and thats what it ran.Now if only the driver could remember he is in a door car and not a dragster at the stripe we would be ok!