[johnta1]

Thanks for the corrections, Glenn.
That's what I had guessed but wanted to make sure.

Here is Pipe Max data on the headers:

--- Single Primary Pipe Specs --- ( Mid-Range TQ to Higher RPM Horsepower )
Diameter= 2.217 to 2.342 Total Length= 23.5 to 25.9 inches long
--- 2-Step Primary Pipe Specs --- ( Mid-Range TQ to Higher RPM Horsepower )
1st Step Dia. inches= 2.217 Length= 7.8 to 9.0
2nd Step Dia. inches= 2.342 Length= 15.6 to 16.9
--- 3-Step Primary Pipe Specs --- ( Higher RPM Horsepower, possible TQ loss )
1st Step Dia. inches= 2.217 Length= 7.8 to 9.0
2nd Step Dia. inches= 2.342 Length= 7.8 to 8.4
3rd Step Dia. inches= 2.467 Length= 7.8 to 8.4

You're running gasoline I think?

Possibly try alcohol if so?

[Glenn Sedig]

Originally Posted by Glenn Sedig View Post
IA II block
473 cu
4.310 bore
4.050 stroke
6.800 alum rods
1.9 rocker ratio
1000 lb open spring pressure
All Tiger heads Port work by BES Racing 450 ish cfms 55cc chambers
7/16 push rods
Wenzler 2 X 4 intake manifold Port work by Vintage Mechanical Works per BES specs.
(2) 1150 Dominator carbs 102 main jets Q-16 fuel
Comp cams .995 lift 282 intake 300 exhaust @.050 4 - 7 swap
Headers built by Vintage Mechanical Works Step 2 1/4 dia to 2 3/8 dia

14.5 compression
1075.5 hp @7900 rpm
763.0 ft/lb trq @ 7100 rpm

With this combination (473 cubic inches, 3070 lbs) we qualified with a 8.491 et at 158.09 mph at Tom's Heads up race at Norwalk in 2015. Still not as fast as Picket's wagon. So was wondering if you guys have an opinion on the improvements I can gain with the following changes:

Dry sump
New custom built headers
Sheet metal intake
Seal hood scoop to the carburetor (Ram Air)

Thanks for the help
Glenn Sedig

Originally Posted by johnta1

Thanks for the corrections, Glenn.
That's what I had guessed but wanted to make sure.

You're running gasoline I think?

Possibly try alcohol if so?

John,

I tried alcohol and got no improvement.

[slowbird]

Originally Posted by Glenn Sedig

Originally Posted by Glenn Sedig View Post
IA II block
473 cu
4.310 bore
4.050 stroke
6.800 alum rods
1.9 rocker ratio
1000 lb open spring pressure
All Tiger heads Port work by BES Racing 450 ish cfms 55cc chambers
7/16 push rods
Wenzler 2 X 4 intake manifold Port work by Vintage Mechanical Works per BES specs.
(2) 1150 Dominator carbs 102 main jets Q-16 fuel
Comp cams .995 lift 282 intake 300 exhaust @.050 4 - 7 swap
Headers built by Vintage Mechanical Works Step 2 1/4 dia to 2 3/8 dia

14.5 compression
1075.5 hp @7900 rpm
763.0 ft/lb trq @ 7100 rpm

With this combination (473 cubic inches, 3070 lbs) we qualified with a 8.491 et at 158.09 mph at Tom's Heads up race at Norwalk in 2015. Still not as fast as Picket's wagon. So was wondering if you guys have an opinion on the improvements I can gain with the following changes:

Dry sump
New custom built headers
Sheet metal intake
Seal hood scoop to the carburetor (Ram Air)

Thanks for the help
Glenn Sedig



John,

I tried alcohol and got no improvement.

Going to be very hard to over come the Liberty trans Pickett's run.

[mike leech]

Originally Posted by Glenn Sedig

Originally Posted by Glenn Sedig View Post
IA II block
473 cu
4.310 bore
4.050 stroke
6.800 alum rods
1.9 rocker ratio
1000 lb open spring pressure
All Tiger heads Port work by BES Racing 450 ish cfms 55cc chambers
7/16 push rods
Wenzler 2 X 4 intake manifold Port work by Vintage Mechanical Works per BES specs.
(2) 1150 Dominator carbs 102 main jets Q-16 fuel
Comp cams .995 lift 282 intake 300 exhaust @.050 4 - 7 swap
Headers built by Vintage Mechanical Works Step 2 1/4 dia to 2 3/8 dia

14.5 compression
1075.5 hp @7900 rpm
763.0 ft/lb trq @ 7100 rpm

With this combination (473 cubic inches, 3070 lbs) we qualified with a 8.491 et at 158.09 mph at Tom's Heads up race at Norwalk in 2015. Still not as fast as Picket's wagon. So was wondering if you guys have an opinion on the improvements I can gain with the following changes:

Dry sump
New custom built headers
Sheet metal intake
Seal hood scoop to the carburetor (Ram Air)

Thanks for the help
Glenn Sedig



John,

I tried alcohol and got no improvement.

what headers are there now?

[Glenn Sedig]

IA II block
473 cu
4.310 bore
4.050 stroke
6.800 alum rods
1.9 rocker ratio
1000 lb open spring pressure
All Tiger heads Port work by BES Racing 450 ish cfms 55cc chambers
7/16 push rods
Wenzler 2 X 4 intake manifold Port work by Vintage Mechanical Works per BES specs.
(2) 1150 Dominator carbs 102 main jets Q-16 fuel
Comp cams .995 lift 282 intake 300 exhaust @.050 4 - 7 swap
Headers built by Vintage Mechanical Works Step 2 1/4 dia to 2 3/8 dia

14.5 compression
1075.5 hp @7900 rpm
763.0 ft/lb trq @ 7100 rpm

With this combination (473 cubic inches, 3070 lbs) we qualified with a 8.491 et at 158.09 mph at Tom's Heads up race at Norwalk in 2015. Still not as fast as Picket's wagon. So was wondering if you guys have an opinion on the improvements I can gain with the following changes:

Dry sump
New custom built headers
Sheet metal intake
Seal hood scoop to the carburetor (Ram Air)

Thanks for the help
Glenn Sedig

Originally Posted by slowbird

Going to be very hard to over come the Liberty trans Pickett's run.

Slowbird,

I am running a Rossler low drag competition trans. It may not be as fast as a Liberty, but I hope I can overcome the difference with other changes.

[Glenn Sedig]

IA II block
473 cu
4.310 bore
4.050 stroke
6.800 alum rods
1.9 rocker ratio
1000 lb open spring pressure
All Tiger heads Port work by BES Racing 450 ish cfms 55cc chambers
7/16 push rods
Wenzler 2 X 4 intake manifold Port work by Vintage Mechanical Works per BES specs.
(2) 1150 Dominator carbs 102 main jets Q-16 fuel
Comp cams .995 lift 282 intake 300 exhaust @.050 4 - 7 swap
Headers built by Vintage Mechanical Works Step 2 1/4 dia to 2 3/8 dia

14.5 compression
1075.5 hp @7900 rpm
763.0 ft/lb trq @ 7100 rpm

With this combination (473 cubic inches, 3070 lbs) we qualified with a 8.491 et at 158.09 mph at Tom's Heads up race at Norwalk in 2015. Still not as fast as Picket's wagon. So was wondering if you guys have an opinion on the improvements I can gain with the following changes:

Dry sump
New custom built headers
Sheet metal intake
Seal hood scoop to the carburetor (Ram Air)

Thanks for the help
Glenn Sedig

Originally Posted by mike leech

what headers are there now?

Headers are Step 2 1/4 dia tube to 2 3/8 dia tube

[mike leech]

biggest bang is sealing the hood as you may know. then sheet metal, then dray sump(maybe, should help under inertia....=go faster.

[johnta1]

John,

I tried alcohol and got no improvement.

Glenn, did you use carbs with the alcohol when you tried it?

[slowbird]

I agree with Mike sealing the hood and intake will proved most gain. Guessing you could find .1 maybe .15 with those changes.

[dci]

Glenn, please correct me if I'm wrong, but your peak HP and peak TQ numbers look to close together to me. That needs to be investigated because if you can spin the engine a little harder you will obviously make more power. Typically you should see about a 1,500 rpm spread between HP and TQ.

[mike leech]

Fwiw i would say its not as unusual as it might think don. For the stroke the torque is high IMO. That would lend to a more efficient head/combo. Although i would like to see pk hp and tq occur higher. Like a 1000 rpm

[dci]

Mike I agree he has a pretty efficient combo, but even pro stock engines have about a 1500 rpm split. Just seems odd to me. It may be valve springs or pushrods making it so peaky I don't know for sure. Just a stab from what I've seen with engines I have dynoed. I could be wrong ?????

[mike leech]

I've only got about 900 to a thousand

[Tom Vaught]

The Keens were about 9200 on peak HP and about 8400 on peak torque with the boosted engine. Definitely not a 1500 rpm spread for them. The engine would fall back about 1000 rpm on the gear change with a good converter, (and they went thru lots of borrowed converters looking for the ones close to 1000 rpm drop).

Tom V.

[tom s]

1500 diff on the pickett engine.Tom

[grnmnstr]

Just for more comparative info, my 535 (under-square) made peak torque at 6300 and peak power at 7300.

My RPM drop on the shift is 850 - 900 RPM. 8" PTC.

[slowbird]

Originally Posted by Glenn Sedig

Originally Posted by Glenn Sedig View Post
IA II block
473 cu
4.310 bore
4.050 stroke
6.800 alum rods
1.9 rocker ratio
1000 lb open spring pressure
All Tiger heads Port work by BES Racing 450 ish cfms 55cc chambers
7/16 push rods
Wenzler 2 X 4 intake manifold Port work by Vintage Mechanical Works per BES specs.
(2) 1150 Dominator carbs 102 main jets Q-16 fuel
Comp cams .995 lift 282 intake 300 exhaust @.050 4 - 7 swap
Headers built by Vintage Mechanical Works Step 2 1/4 dia to 2 3/8 dia

14.5 compression
1075.5 hp @7900 rpm
763.0 ft/lb trq @ 7100 rpm

With this combination (473 cubic inches, 3070 lbs) we qualified with a 8.491 et at 158.09 mph at Tom's Heads up race at Norwalk in 2015. Still not as fast as Picket's wagon. So was wondering if you guys have an opinion on the improvements I can gain with the following changes:

Dry sump
New custom built headers
Sheet metal intake
Seal hood scoop to the carburetor (Ram Air)

Thanks for the help
Glenn Sedig

Glenn can you raise your compression (milling the heads possible)? Getting it up to 16:1 will help. Also looking more at your results i think a new intake will help. We arent to far apart on cams but im 38ci bigger and my 511ci peaks 200-300rpm higher.

[Glenn Sedig]

IA II block
473 cu
4.310 bore
4.050 stroke
6.800 alum rods
1.9 rocker ratio
1000 lb open spring pressure
All Tiger heads Port work by BES Racing 450 ish cfms 55cc chambers
7/16 push rods
Wenzler 2 X 4 intake manifold Port work by Vintage Mechanical Works per BES specs.
(2) 1150 Dominator carbs 102 main jets Q-16 fuel
Comp cams .995 lift 282 intake 300 exhaust @.050 4 - 7 swap
Headers built by Vintage Mechanical Works Step 2 1/4 dia to 2 3/8 dia

15.4 compression
1075.5 hp @7900 rpm
763.0 ft/lb trq @ 7100 rpm

With this combination (473 cubic inches, 3070 lbs) we qualified with a 8.491 et at 158.09 mph at Tom's Heads up race at Norwalk in 2015. Still not as fast as Picket's wagon. So was wondering if you guys have an opinion on the improvements I can gain with the following changes:

Dry sump
New custom built headers
Sheet metal intake
Seal hood scoop to the carburetor (Ram Air)

Originally Posted by slowbird

Glenn can you raise your compression (milling the heads possible)? Getting it up to 16:1 will help. Also looking more at your results i think a new intake will help. We arent to far apart on cams but im 38ci bigger and my 511ci peaks 200-300rpm higher.

Slowbird

Sorry, I rechecked my paper work and the compression is 15.4. It will be hard to get much more. The piston domes are from molds of the chamber.
My intake runners may be a bit to long so maybe a sheet metal intake will help.

[Glenn Sedig]

Originally Posted by dci

Glenn, please correct me if I'm wrong, but your peak HP and peak TQ numbers look to close together to me. That needs to be investigated because if you can spin the engine a little harder you will obviously make more power. Typically you should see about a 1,500 rpm spread between HP and TQ.

I wonder if a sheet metal intake would increase hp and rpm? My intake runners may be a bit long and making more torque? Or, would sealing the carbs to the scoop make the intake closer to optimum?

[Half-Inch Stud]

I wonder if Tapered headers outperform stepped headers.....