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Here's some Pontiac pro stock stuff I ran across from the mid 2000's.

ProStock 500 cid typically 1350+ HP and 824+ Torque

Tri-Y Headers picks up 60 Ft ET , hurts MPH , works great in bad air
21 to 23 inches with 12 inch Megaphone Collector at 12 inches
goes from 3.500 OD for 2.750 length to 4.500 OD at 12 inches 4.5-5.0 deg.

4-1 Headers are also 21” to 23” inches long and 19 to 20 in good air
3-Step Header design 1st= 2.125 x 6, 2nd= 2.375 x 6, 3rd= 2.500 x 9 inch
Collector = 12.0 inches long megaphone style with 5.3 deg Cone shape
Lift Int Exh outstanding use of Inertia/Wave tuning
.200 = 144 90 with great Cylinder Head Porting
.400 = 336 210 combines to create 125 Ve % +
.600 = 475 297
.800 = 550 344
.900 = 575 359
1.000= 580 363

2005 New Info= Peak TQ @ 8100-8300 Peak HP @ 9400-9600 1400 HP
Shift Points= 10100 to 10200 RPM
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July 18, 2006 new Info :
Peak HP is at 9450 to 9550 RPM = 1380 HP 1355 HP @ 29.60, 77F, 50% RH
Peak TQ is at 8000 to 8100 RPM = 855 TQ 825 TQ @ 29.60, 77F, 50% RH
Lift-Intake-Exhaust
.200-148.9--118.6
.300-246.1--176.1
.400-350.3--222.6
.500-429.0--267.1
.600-500.4--306.6
.700-544.4--331.2
.800-568.6--344.3
.900-583.6--354.0
1.000-599.9-359.8
 

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That thing sounds pissed off, down right ignorant, lol
How's everything going?
Everything is going well considering everything that's going on. I do feel very fortunate enough as I'm sure a lot of us all do, to be surviving through all of this. I truly feel for those that are in very bad shape cause of all what is going on. My heart goes out to all the medical workers and pubic safety workers who are all working countless hours to help this country get through all of this and all the ones who are suffering. So I guess in saying that, I'm great!
 

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View attachment 91602 my son got the plenum spacers all rigged up. 1/2 and 1”
Nice ....

If the 1" makes more than the 1/2" be prepared and have some long studs and gasket maker to put the 1/2" on top of the 1" and see what happens.
 

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Yes g-code. I really have no idea. Its kinda a black magic almost. Some say gains others not so sure. I’m making a few other changes also. Beefing up pushrods to .135 wall and i may try lighter oil. Kevin Johnson is sending me some windage screens for oil pan also.
 

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Yes g-code. I really have no idea. Its kinda a black magic almost. Some say gains others not so sure. I’m making a few other changes also. Beefing up pushrods to .135 wall and i may try lighter oil. Kevin Johnson is sending me some windage screens for oil pan also.
I hope you radius those runner entries like I mentioned....
 
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