496ci revamped

Okay new torque converter works great
3rd gear is way more positive.
Retarded cam 2 degrees now it raps out
To 6500 new single plane intake
Works well too...
Only had to tweak the fuel on acceleration at 5k afr jumped 18
Added fuel back to 13.2

Going racing Friday weather permitting
We will see if any of all helped

Good Luck !
 
Better, a few more tweaks will help.
Only got to make one pass, got over late
But car seems to be pretty happy

index.php
 

Attachments

  • 20180928_212602.jpg
    20180928_212602.jpg
    80.9 KB · Views: 41
Last edited by a moderator:
Better, a few more tweaks will help.
Only got to make one pass, got over late
But car seems to be pretty happy
It's running good.
It's a tad bit faster than original goal was I recall from several months back.

Closer to be 10's wish no power adder.

The Heavy Race weight is the biggest inhibiter.
Since your car is EFI Race Profile cam swap is not ideal.
Driver car too.
Pump gas.
Not Race Gas.

Swapping to lower diff gears will help.
Chevy always want at least a 4.10 gear.

Pontiacs want 3.90- 4.10-4.30-4.56 with a 27.0 -31.0 inch tall rear tire.

Does not mean a taller gear is not working.
Optimal for cruising or top end runs.
Not For 1/8 or 1/4 mile runs.

Mph trap speed kinda falling short yet where I would like to see.
Every Big Block Chevy wants to breathe free.
Thunder in the Air .
Open exhaust.
Nothing.
Just open headers.
Corvette open sidepipes.

Pontiac 400 & 455 same way.

1.7 60 foot times Ok.
Car not chassis responding ideal with sticky tires yet.
 
Often a gear swap to a lower diff gear like 4.10 will help a car to chassis hook up right.
Sometimes unleashes More Hp delivered to the Ground seen on timeslips as better MPH Trap speeds.
Usually on Small cubic inch engine cars with weaker torque band.

Big Blocks tend to deliver Near same MPH Trap speeds tall gear or right gear for Drag strip.

Have to try it.
4.10 gear at least I say.
 
You hear Grumpy and me sometimes talk about Cylinder Head Port Velocity Air Speeds.
It's there in every engine.
No good way to measure it.

Has to do with the cross section of the intake port designed.
Also with the pinch point area.

Chevrolet was Generous.
Big Ports in BBC.

Pontiacs have smaller ports in general except for a few rare engines made.
Pull a taller gear better.
Crankshaft stroke length also a big factor.

It comes down to experience what Diff gear is needed or works best.
 
7Sn0YGl.png
GTzoCNX.png
YUiApWo.png


I spent a little time this morning researching low cost exhaust upgrade for you.
Need some kind of exhaust on the street to avoid tickets.
4.0" inch In & Out Hooker Aero Chamber Mufflers.
Have Good Reviews.
Use Turn down tips by Walker on Muffler Outlets.
Should be able to buy all and weld fab up for $275- $300.
 
GX6dNQv.png


What I want to buy for my own 70TA.
Replace the original Flow Master 2 chamber 3.0" inches.
1996 year original. Lasted never rusted out.
 
My brother in law and I was just talking about gear , now it's 3.73 I'm at 5600 in third gear crossing the line with having 4th gear I could easily get away with 4.11
Which should help with short time.
And help air it out at the end of the track
I was going to open up headers but was only able to make two passes, and one pass I let my son buzz it down the track after he blew me smoke about sleeping at the light.
He ran a 12.4 lol:D
 
My brother in law and I was just talking about gear , now it's 3.73 I'm at 5600 in third gear crossing the line with having 4th gear I could easily get away with 4.11
Which should help with short time.
And help air it out at the end of the track
I was going to open up headers but was only able to make two passes, and one pass I let my son buzz it down the track after he blew me smoke about sleeping at the light.
He ran a 12.4 lol:D
The 4.11 gear will help.
Use Richmond Gear.
A Motive Gear.
Or Strange Engineering.
Have to get the pinion depth dead nuts on.
It used to be easy with a pinion depth guage.
That was with old 5 cut gears.
All are 2 cut gears now other than Strange.
Actaully a US Gear Gearset Strange sells.
Known to have a bit of gear whine because cut for max strength.
I have set up a few Strange gears and dead quiet.
Depends upon personal experience.
I have lots of it building rear diffs in the past.

Gear. 4.11.
Better exhaust.
A slight nose down stance will help cut through the air.
I prefer a 1.00 inch Rake nose drop.
Means cutting the front coil springs often.
What I did.
Make the car as light as possible within budget and what you can tolerate for Street comfort. A heater is must have for me for fall driving.
Lose the front sway bar.
They only work on early 2nd Gen Trans Am 1970-74.
Not kill 60 foot times bad.
Think it is because of the matched spring rates front and rear Pontiac Engineers came up with.

Some will be trial and error testing.
Keep at it.
 
So my plan is new spool (aluminum strange) new aluminum pig
4.11 street gear from Richmond
I'm running a Ford 9" so gear change is pretty easy according to my brother in law, he's done a few on his rail car.
Aluminum spool may suck on street
But it's not a fully daily driver
But it should reduce rotating mass and mass in general, hoping between aluminum pig and spool I can knock 50 lbs off the car
 
Couple shots digging
 

Attachments

  • Screenshot_20180929-081924_Video Player.jpg
    Screenshot_20180929-081924_Video Player.jpg
    29.2 KB · Views: 8
  • Screenshot_20180929-082019_Video Player.jpg
    Screenshot_20180929-082019_Video Player.jpg
    29.3 KB · Views: 7
Couple shots digging
Front end rise lift looks good .
The rear it looks like your using Chevy Rally Steel Rims.
A switch to modern aluminum rims will help.
You don't need billet aluminum wheels.
Vintage Welds are good.
Vintage Centerline solids they are 2- piece and fully riveted together.
 
I'm thinking by going with a 4.11 gear
I should be able to go a couple more degrees retarded on cam timing (which sets intake center line 112 not 108)
Which should raise hp correct?
Or go with gear change first then cam timing ?
 
compared to a differential or rear gear set change,
the cam timing change does not require much
time,effort or cash,

thus its far less difficult and easily reversed,
if that is required for a great deal less
time,effort or cash, making it the first choice here
 
The 4.11 gear will help.
Use Richmond Gear.
A Motive Gear.
Or Strange Engineering.
Have to get the pinion depth dead nuts on.
It used to be easy with a pinion depth guage.
That was with old 5 cut gears.
All are 2 cut gears now other than Strange.
Actaully a US Gear Gearset Strange sells.
Known to have a bit of gear whine because cut for max strength.
I have set up a few Strange gears and dead quiet.
Depends upon personal experience.
I have lots of it building rear diffs in the past.

Gear. 4.11.
Better exhaust.
A slight nose down stance will help cut through the air.
I prefer a 1.00 inch Rake nose drop.
Means cutting the front coil springs often.
What I did.
Make the car as light as possible within budget and what you can tolerate for Street comfort. A heater is must have for me for fall driving.
Lose the front sway bar.
They only work on early 2nd Gen Trans Am 1970-74.
Not kill 60 foot times bad.
Think it is because of the matched spring rates front and rear Pontiac Engineers came up with.

Some will be trial and error testing.
Keep at it.
I believe my posi is shot, one tire spins in burnout box other spins but very slow. switching to full locker , I didn't think a full spool would be very good on the street. I bought a Yukon aluminum case and cap and a Richmond powertrax locker and gear set kit, to just build a new pig.
 
I believe my posi is shot, one tire spins in burnout box other spins but very slow. switching to full locker , I didn't think a full spool would be very good on the street. I bought a Yukon aluminum case and cap and a Richmond powertrax locker and gear set kit, to just build a new pig.
Only a Detroit Locker will hold up to the 496 BBC.
On the brink full spool.

Old Dana 60 Powertrax Posi can take it.
Pontiac 9.3.
That style Posi never made for a Ford 9.
 
I know I know
Street car race car
Might have it order a spool to, may put locker in old pig for street and spool and new pig for the track
I built a 1964 GTO Rearend for a guy back in 2001 -2002.
Used Richmond 3.90 Gears.
389 Tripower Muncie 4-speed convertible.
Not every GTO was ordered with Posi.
Many seen it as dangerous back then.
More likely to fishtail.
So Posi was optional.
I used A Richmond Gear Sold Powertrax No Slip Locker that had the special synchronized locker.
Absolute quiet.
Worked better than any posi.
I remember catching all 4 gears burning rubber.
Looked at the blacktop and 4 perfect set of Twin strip burn marks on each gear change.
Car only had maybe 360 Hp.
428 -440 ft/lbs torque.

Your Really pushing the design.
 
Not sure what to do, but I'm pretty sure
This isn't correct, I called jeg's on the issue and they sent another set of bearings
Which are a different part number but measure the same, the spool is centered up but only half the race sets in the pocket on both sides.

Any ideas?20190104_161637.jpg
 
Back
Top