travis wrote: ↑Fri Aug 21, 2020 10:43 am
Will a 1 5/8” header support 500+ HP without completely choking it to death?
Application will be a 408 sbf. Unfortunately for us truck guys there are no reasonably priced options for larger tubes (that I know of). SBF 1 3/4” tubes or larger typically go to a different flange bolt pattern, of which is available only for more typical performance platforms like mustangs.
This is kind of a bucket list type build for me...and I want to get it done before the arthritis in my hands gets to the point that I can’t do this anymore.
I’m thinking somewhere in the 2500-3000 range.
That’s another downside to the weight...it makes a looser converter feel even looser under normal driving.
I have a heavy duty Hughes 11” in the ‘83 that is rated at 2500.
It took a bit of getting used to but it isn’t bad at all.
here's some Engine Specs + Dyno Sheet for SBF352cid engine
its the closest Dyno Data to what you are asking about that i could find .
438.6 / 352cid = 1.246 HP/CID Ratio
1.246 HP/CID Ratio * 406cid = 505.9 Peak HP
Peak TQ = 429.2 @ 4800 RPM
Peak HP = 438.6 @ 5500 RPM
Edelbrock Performer RPM Heads out the box 1.900/1.600 valves
Edelbrock RPM Air Gap intake manifold .750 angle spacer
Stock Ford Mustang oil pan Shell Rotella 15/40 6 qrts
Power Products Balancer
Ricks Dirt Track Schoenfeld Headers 1.625 3.000 Collector
Scat Crank and IBeam Rods 5.400
Keith Black Hyperutectic -6.5 CC flat top valve reliefs = 10.1:1 CR
Chevron 93 prem pump gas
Total Seal Rings 1/16,1/16,3/16
Holley Street Avenger 770 CFM vac carb
Scorpion 1.60 Rockers
Howards Hyd Roller Cam 235/241-112 on 110 CL .581/.581
30 btdc from 28
Carb light-Silver vac diaphram spring
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