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347 SBF Dyno Results

11K views 32 replies 18 participants last post by  Srs_Chris  
#1 ·
Thought I would share the results of a recent trip to the dyno...

Engine: 347 SBF
Block: Factory Hydraulic Roller Block
Crank: Scat 9000 Cast. 3.4 stroke
Rods: Scat 5.4" I-beam
Pistons: Probe 4032 Forged, flat top
Compression: 10.5:1
Heads: AFR 205, floors epoxied at entrance, pushrod pinch widened
Camshaft: Hydraulic roller, adv 299/327, @.050 236/248, lsa 110, .617/.595
Intake: Parker Funnel Web w/ plenum work
Carb: Pro Systems 1,000 cfm
Fuel: VP C12

Naturally Aspirated: 510 hp @ 6,570 & 448 ftlbs @ 5240

#57 Jet in Edelbrock Plate: 673 hp @ 6,440 & 653 ftlbs @ 5,160
 
#7 ·
To be honest, these numbers were not expected. I was anticipating around 450-475 NA and 550-600 on a #57 jet. This motor does not run a girdle, just ARP main studs with factory caps. If the owner can keep a safe tune in it it will likely last the summer. If not, it will quickly become two 4-cylinders. Been there... done that. I do not recommend running these power levels with these components. However, it did turn out well for a budget oriented build.
 
#11 ·
Lift CFM CFM w/Intake
.100 83 79
.200 150 150
.300 207 202
.400 256 242
.500 286 259
.600 305 272
.700 303 274

Did not touch the exhaust side. The intake port lost only 2 - 4 cfm at .600 and .700 with the port mods. Average was up 2 - 3. An argument could be made that it was a waist of time, but I wanted to shrink the CSA down a bit to bring velocity up. All numbers corrected to 28".

Timing was best at 32* NA
 
#12 ·
stout little piece, congrats !
 
#15 ·
Yes

Did you flow with the intake attached?
Yes. See prior post with flow numbers.

How much work went into the funnelweb?
The funnel web comes with a cloverleaf style mounting pad. Because of the nitrous plate I cut out the cloverleaf flares to make it a standard open style plenum. The top of the centre port divider walls were generously radiused and laid back. The Corner divider walls were not happy. I radiused as much as I could and slightly cut back the bottom of the wall to create a curved wall (laid back at top and bottom). Once everything was done all ports flowed fairly consistent when attached to the head. The floors were epoxied and blended to match the final port shape. I will post some photos on the webpage at www.SimpsonRacingSolutions.com.
 
#22 ·
Awesome results, I'm building a 347 myself with similar cam and OOTB 205's from Ed. I know mine won't be as impressive as yours, I just hope it stays together...LOL!
 
#23 ·
#26 ·
Been observing a lot of builds with that funnel web and AFR heads putting out big numbers.
 
#27 ·
321 Edelbrock Performer Head and Parker Funnel Webb. This one had 13.5 compression but Flat tappet cam. 513 Hp.


I think we had a good day on the dyno today.
I am happy with the results and the customer is too
Engine last year was 467 on gas and 481 on methanol.
We picked up 45 hp peak and 40hp average(ON GAS) over the way the engine was when we ran it with the stock block. We picked up 38 ft. lbs torque average.

On the dyno sheet below sweep 10 is GASOLINE

Sweep 15 is METHANOL.

 
#30 ·
i honestly cant believe that the funnel web didnt take off better, its a great intake. Does a great job of filling the void in between vic jr and super vic!