Editing DynoSim combinations (section)
Jump to:
navigation
,
search
===400 SBC street/strip truck motor=== *400 block bored 0.030" and zero decked to the piston crowns, align honed main bearing bore. *Scat p/n 9-400-3750-5700 cast steel Pro Comp crankshaft. *Scat forged I-beam 5.7" rods. *Keith Black [http://www.summitracing.com/parts/UEM-KB168-030 p/n UEM-KB168-030] hypereutectic pistons with 22cc dish to make 9.8:1 static compression ratio with 64cc heads. *Comp Cams [http://www.summitracing.com/parts/CCA-12-430-8/ p/n CCA-12-430-8] retro-fit hydraulic roller cam installed 2 degrees retarded. *Howard's [http://www.summitracing.com/parts/HRS-91164N/ retro-fit hydraulic roller lifters]. *Comp Cams [http://www.summitracing.com/parts/CCA-200/ p/n CCA-200] thrust button. *Comp Cams [http://www.summitracing.com/parts/CCA-201/ p/n CCA-201] wear plate. *Edelbrock [http://www.summitracing.com/parts/EDL-7101/ p/n EDL-7101] Performer RPM intake manifold. *Dart Iron Eagle Platinum 215 cast iron heads, [http://www.summitracing.com/parts/DRT-10521123P/ p/n DRT-10521123P] (price shown is for one head). *Barry Grant [http://www.amazon.com/Barry-Grant-1...r/dp/B000CIN32M Speed Demon 750] (BG is now defunct, so a similar carb may be substituted). *Hedman [http://www.summitracing.com/parts/HED-69088 Elite headers], 1-3/4" primaries. ====Results==== :'''RPM HP TQ''' *2000 154 405 *2500 195 410 *3000 250 438 *3500 319 479 *4000 386 507 *4500 446 521 *5000 486 511 *5500 511 488 *6000 515 451 *6500 490 396 {{Note1}} L31 Vortec heads need work to use enough cam to make really good power. This can run into a lot of money. It may be cheaper to start off with an aftermarket head in the first place. That said, using production Vortec heads this 406 SBC combo did make an estimated 450 hp and 482 ft/lb of torque. But using a set of Dart heads the same combo made 515 hp and 521 ft/lb torque. =====Timing===== Use 16 degrees initial timing advance and 18 degrees of mechanical advance for a total of 34. If the motor needs a little more total, move the lead at the crank to 18 degrees. You will not need a high-dollar ignition system. A rebuilt GM HEI will work nicely. See '''[[Hot rodding the HEI distributor]]''' for more info. =====Fuel pressure===== If you have too much fuel pressure, it will blow past the needle and seat in the bowl and into the intake manifold as raw fuel. This will cause you untold tuning nightmares, so get this under control first thing. Do not assume that published pressures are correct- you need to verify the pressure by using a gauge. Run a nylon or copper line from the carburetor inlet back to the firewall and up past the hood lip to the cowl of the truck. On the cowl, temporarily mount a mechanical fuel pressure gauge (0-15 psi) so that you can view it through the windshield as you drive. Regulate fuel pressure down to 5 to 5-1/2 psi. =====Steam holes===== The 400 block will require that you drill steam holes in the heads. Any manufacturer you buy from will drill them for you before they ship the heads to you. Install the heads with a head gasket that is designed for installation on a 400 block because the gaskets will also have steam holes in them from the manufacturer. Here is [http://www.crankshaftcoalition.com/wiki/Drilling_steam_holes_in_smallblock_Chevy_heads '''more info''']. Use a composition gasket that compresses to 0.039" to 0.041". With the zero deck of the block, this will put the piston crown at 0.039" to 0.041" from the underside of the cylinder head with the piston at TDC. This establishes your "squish" dimension at 0.039" to 0.041", which will optimize the motor for detonation-free operation on pump gas.
|
Editing help
(opens in new window)
Personal tools
Log in / create account
Namespaces
Page
Discussion
Variants
Views
Read
Edit
View history
Actions
Search
Navigation
Main Page
Recent changes
Random page
Help
All articles
Start a new article
Hotrodders forum
Categories
Best articles
Body and exterior
Brakes
Cooling
Electrical
Engine
Fasteners
Frame
Garage and shop
General hotrodding
Identification and decoding
Interior
Rearend
Safety
Steering
Suspension
Tires
Tools
Transmission
Troubleshooting
Wheels
Toolbox
What links here
Related changes
Special pages
Terms of Use
Copyright
Privacy Policy
Your Privacy Choices
Manage Consent