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Boss 347 Dyno Results
#21
Nice !!!
Bravo



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#22
So you did hit the red zone! Smile
Awesome!

73 modified Grandé 351C. Almost done. 
71 429CJ. In progress
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#23
(08-20-2018, 03:02 PM)Heavy Metal Wrote: Wow.....so maybe I shouldn't give up my 302 for a 351C.
Would you share the components and specifications that made this thing so "Friskie".

Thank you,
HVY MTL

347 inch 1969 Boss 302, 10:1, SFT cam, Dual plane (Ed 7129), 750 HP carb (80528-2), 1.875 Primary tube 34" long to 3.5 inch collector 10 inches long. 
Crank and rods from Molnar, pistons from Racetec, ATI damper, internal balance. Custom solid flat tappet cam from Jones cams (aggressive for street use), minor porting of 1969 Boss 302 heads Very good valve train components. I have no idea what is going on with the font size. Chuck

   
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#24
C9ZX,
Stop the torture!
There HAS to be an engine build thread on this engine.
There HAS to be an engine build thread on this engine.
Boilermaster
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#25
(08-21-2018, 07:41 AM)boilermaster Wrote: C9ZX,
Stop the torture!
There HAS to be an engine build thread on this engine.
There HAS to be an engine build thread on this engine.
Boilermaster

Here is the short version.
 I used the 302 Boss engine because it goes into a real Boss 302 powered 1969 Cougar Eliminator. The cam (SFT) is very aggressive for a street cam, making it idle reasonably well will likely be a challenge.
[Image: cam_card_Jones_B349_V2_copy.jpg]
Bore is 4.040, stroke 3.400 (forged), rods (I beam) 5.400. Crank and rods from Molnar, pistons are (forged) flat tops from Racetec (10:1 SCR), rings moly top, napier second, medium low tension oil ring  (Total Seal, not gapless, top and second, Hastings oil ring). Quench distance is .036. Lightweight valve train components (hollow stem intake valves, titanium retainers and locks) and (controlling the big intake valve is challenging). Spring pressure is 390 over the nose which will put the seat at about 160 (break in done with inner spring removed). Minor porting of Boss 302 heads in bowls, chamber, and short side, quality 5 angle valve job. .118 wall Smith Brothers pushrods (custom length, optimized geometry). Intake is out of the box Edelbrock 7129. 1 inch open spacer. Carb is Holley 750 HP, 0-80528-2, custom calibrated. Total timing 38 degrees.
The headers were stepped dyno pieces. The in car headers are Hooker 1/78 primaries, 34 long, 3 1/2 collectors 10 inches long. It is likely the torque will go up a little bit and the HP may go down a little bit with the in car headers. Chuck


Attached Files
.pdf   Boss 302 Head Flow Data.pdf (Size: 21.3 KB / Downloads: 8)
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#26
(08-19-2018, 02:41 PM)Don C Wrote: I like to look at these in a line chart. Talk about a flat torque curve.
[Image: BOSS_347_Dyno.jpg]
Amazing... the top torque number doesnt tell the whole story. He is getting 350 (1 to 1 torque/CI) already at 3000 rpm and thats with a very aggresive cam.

Sent from my SAMSUNG-SM-G930A using Tapatalk

        [Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes
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#27
(08-21-2018, 07:20 AM)c9zx Wrote:
(08-20-2018, 03:02 PM)Heavy Metal Wrote: Wow.....so maybe I shouldn't give up my 302 for a 351C.
Would you share the components and specifications that made this thing so "Friskie".

Thank you,
HVY MTL

347 inch 1969 Boss 302, 10:1, SFT cam, Dual plane (Ed 7129), 750 HP carb (80528-2), 1.875 Primary tube 34" long to 3.5 inch collector 10 inches long. 
Crank and rods from Molnar, pistons from Racetec, ATI damper, internal balance. Custom solid flat tappet cam from Jones cams (aggressive for street use), minor porting of 1969 Boss 302 heads Very good valve train components. I have no idea what is going on with the font size. Chuck

   
Mechanical lifters?

Sent from my SAMSUNG-SM-G930A using Tapatalk

        [Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes
  Reply
#28
(08-21-2018, 01:36 PM)tony-muscle Wrote:
(08-21-2018, 07:20 AM)c9zx Wrote:
(08-20-2018, 03:02 PM)Heavy Metal Wrote: Wow.....so maybe I shouldn't give up my 302 for a 351C.
Would you share the components and specifications that made this thing so "Friskie".

Thank you,
HVY MTL

347 inch 1969 Boss 302, 10:1, SFT cam, Dual plane (Ed 7129), 750 HP carb (80528-2), 1.875 Primary tube 34" long to 3.5 inch collector 10 inches long. 
Crank and rods from Molnar, pistons from Racetec, ATI damper, internal balance. Custom solid flat tappet cam from Jones cams (aggressive for street use), minor porting of 1969 Boss 302 heads Very good valve train components. I have no idea what is going on with the font size. Chuck

   
Mechanical lifters?

Sent from my SAMSUNG-SM-G930A using Tapatalk

Yes, solid flat tappet cam and lifters.
  Reply
#29
(08-21-2018, 03:30 PM)c9zx Wrote:
(08-21-2018, 01:36 PM)tony-muscle Wrote:
(08-21-2018, 07:20 AM)c9zx Wrote: 347 inch 1969 Boss 302, 10:1, SFT cam, Dual plane (Ed 7129), 750 HP carb (80528-2), 1.875 Primary tube 34" long to 3.5 inch collector 10 inches long. 
Crank and rods from Molnar, pistons from Racetec, ATI damper, internal balance. Custom solid flat tappet cam from Jones cams (aggressive for street use), minor porting of 1969 Boss 302 heads Very good valve train components. I have no idea what is going on with the font size. Chuck

   
Mechanical lifters?

Sent from my SAMSUNG-SM-G930A using Tapatalk

Yes, solid flat tappet cam and lifters.

Not bad for obsolete iron heads thumb

73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.
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#30
It's cool that you used the solid cam. So are you running 2.25 intakes? Back when I built my Boss I bought all my valvetrain parts from Bill Maier , when he used to sell engine parts. Lots of high rpm use, never an issue. Your more modern combo should be even better.
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