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09-09-2007, 04:00 AM
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CC Member
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Join Date: Aug 2006
Cobra Make, Engine: BDR, 351W, 400 Horses
Posts: 520
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Not Ranked
More Power 4 My 351w
i HAVE A 351w CRATE MOTOR. juST LOOKING FOR IDEAS FOR THE MOST ECONOMICAL WAY TO GAIN A BIT MORE HORSE POWER. gOAL: CLEARLY OVERE 400-450- HP OR SO
i'M AT JUST UNDER 400HP (APPRX 385) NOW.
tHANKS FOR ANY INFO.
__________________
These cars are way too cool to keep in the garage.
And, Life is too short to worry about gas milage. So, Lets cruise!! MECOOL: 
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09-09-2007, 04:08 AM
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CC Member
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Join Date: Jul 2007
Location: Waterford,
PA
Cobra Make, Engine:
Posts: 1,384
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Not Ranked
What do you have done so far? Is it just a stock 351 crate motor? Alum heads, cam specs etc?
My original plan was:
408 stroker
forged .030 +19.30cc dish
forged I beams
cast crank
60cc vic jr's
pro products typhoon intake
edelbrock performer 750 carb
pro comp 1.6 roller rockers
.520/.544 234/244 112 separation cam
March alum pulleys
Gordon ( http://www.levyracing.com/) estimated 485hp and 540-550TQ, he recommended more cam and a holley carb to optimize my setup. I'm going more cam and the edelbrock dual quad setup.
__________________
 Bagram AF Afghanistan
Last edited by fsstnotch; 09-09-2007 at 04:49 AM..
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09-09-2007, 04:10 AM
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CC Member
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Join Date: Aug 2002
Location: Dacula, (Atlanta),
GA
Cobra Make, Engine: Unique 427 SC, Southern Automotive 427W Stroker
Posts: 1,649
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Not Ranked
Heads/cam=some, stroke/heads/cam=more.
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After a good hard ride.....oil pressure is over 50, temp is below 190, she idles and no new dents. LIFE IS GOOD!
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09-09-2007, 10:46 AM
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Beam Me Up Scottie
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Join Date: Aug 2004
Location: Squantum (part of Quincy),
MA
Cobra Make, Engine: SPF1049 Titanium w/black stripes, 351W with Trick Flow Heads, Tremec 3550
Posts: 7,592
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Not Ranked
Most economical HP gain ... hmmmmmm
Nitrous
Higher rear end ratio (makes car quicker unless traction limited. If traction limited, go with better tires)
Camshaft
Intake and carb ...
__________________
Warren
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
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09-13-2007, 11:04 PM
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CC Member
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Join Date: Feb 2004
Location: Almere,
NL
Cobra Make, Engine: No cobra YET. Making do for now with a 69 Mach I
Posts: 107
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Not Ranked
Heads
Cam
Compression
I made 400 hp with my 351W with Edelbrock RPM Performers, flat tappet crower cam with the following grind:
INTAKE: Duration: 297º Lift: 0.538 Clearence Hot: 0
EXHAUST: Duration: 308º Lift: 0.534 Clearence Hot: 0
Duration at .050" Intake: 236 Exhaust: 242
and SRP pistons pushing 11:1 compression.
Like you, I wanted more so I sent the heads and intake to FPS in Anaheim for porting and a custom grind roller cam. Troy tells me I should see not less than 450 hp after the porting and cam install and with the right tweaking, perhaps as much as 475. Just got everything back the other day.
There are plenty of matched component packages from Holley and Edelbrock (intake, heads, cam) that are proven 400+ hp.
__________________
I can only please one person a day but today is not your day. And tomorrow isn't looking too good either.
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09-14-2007, 04:43 AM
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Senior Club Cobra Member
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Join Date: Jul 2007
Location: Odessa (Tampa),
FL
Cobra Make, Engine: BDR 559. 410 Stroker 72 block AFR205 Heads, Solid roller lifters, Comp Cams XR286, Eagle 4" stroke internally balanced with chevy journals, Oliver rods, Probe Forged pistons, Mighty Demon, Super Victor, MSD Digital 6.....
Posts: 260
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Not Ranked
Stroke it, cam it and put some AFR heads on it= 500hp+
Budget: Carb/Cam/Intake may give you the extra few ponies depending on what you have now... I have seen carb swaps alone giving 25hp+ gains...
__________________
BDR 559
Indigo Blue, White Stripes
SBF 410
TKO 600 .82 OD (Road Race)
HP= Enough!!
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09-14-2007, 05:18 AM
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CC Member
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Join Date: Feb 2004
Location: Almere,
NL
Cobra Make, Engine: No cobra YET. Making do for now with a 69 Mach I
Posts: 107
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Not Ranked
Quote:
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Originally Posted by BDR561
Stroke it, cam it and put some AFR heads on it= 500hp+
Budget: Carb/Cam/Intake may give you the extra few ponies depending on what you have now... I have seen carb swaps alone giving 25hp+ gains...
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AFR's own website links to the cylinder head shootout. The AFR heads outperformed every other head in the 331-347 strokers except for the 393W strokers, where with the same cam, carb, and intake, the TrickFlow heads thumped the AFRs.
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I can only please one person a day but today is not your day. And tomorrow isn't looking too good either.
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09-14-2007, 05:37 AM
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Senior Club Cobra Member
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Join Date: Jul 2007
Location: Odessa (Tampa),
FL
Cobra Make, Engine: BDR 559. 410 Stroker 72 block AFR205 Heads, Solid roller lifters, Comp Cams XR286, Eagle 4" stroke internally balanced with chevy journals, Oliver rods, Probe Forged pistons, Mighty Demon, Super Victor, MSD Digital 6.....
Posts: 260
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Not Ranked
The motor in the sequel article looks just like mine!! and has almost the same equipment (carb, intake, AFR205's, ignition, stroke, even the color).
__________________
BDR 559
Indigo Blue, White Stripes
SBF 410
TKO 600 .82 OD (Road Race)
HP= Enough!!
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09-14-2007, 09:25 AM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,453
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Not Ranked
One of the most economical power boosters is a blower.
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09-14-2007, 10:36 AM
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CC Member
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Join Date: Jun 2005
Location: Fairfield,
ca
Cobra Make, Engine: CRII with a Stroked Windsor
Posts: 976
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Not Ranked
Quote:
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Originally Posted by bobcowan
One of the most economical power boosters is a blower.
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I second that.. I put a vortech on my 03 Mustang GT and bumped it by 150 HP. |
09-14-2007, 12:52 PM
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CC Member
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Join Date: Jul 2007
Location: Waterford,
PA
Cobra Make, Engine:
Posts: 1,384
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Not Ranked
But don't forget.. if your crate motor was built for high compression or meant to withstand 500hp... a blower might not be for you!
Josh
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Bagram AF Afghanistan
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09-15-2007, 12:17 PM
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CC Member
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Join Date: Feb 2006
Location: Scottsdale,
AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
Posts: 705
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Not Ranked
For making the car quicker and fun the best mod I put on my Cobra was the Mickey Thompson ET street drag radials. The Pro-Systems carb was the next best. The the headers and side pipes were good too.
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09-17-2007, 12:01 AM
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CC Member
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Join Date: Aug 2006
Cobra Make, Engine: BDR, 351W, 400 Horses
Posts: 520
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Not Ranked
I have a holly carb. its specs a total of 385 HP. I was looking to get into the over 400 range. I thinging of a supercharger as well, but not sure. My overall performance is great. I'm just looking for a bit more perhaps.
I like scarring my self at times
__________________
These cars are way too cool to keep in the garage.
And, Life is too short to worry about gas milage. So, Lets cruise!!MECOOL:
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09-17-2007, 02:13 AM
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CC Member
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Join Date: Jul 2007
Location: Waterford,
PA
Cobra Make, Engine:
Posts: 1,384
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Not Ranked
Do you know the cam specs of your engine? What heads and intake? If you are running a milder cam and some smaller heads, the supercharger is going to definitely get you over the 400hp mark, but with poor flowing heads and intake coupled with the wrong cam, it definitely wouldn't be optimal! If youre heads and intake are already constricting airflow on the 351, it's going to be just as constrictive if you are force feeding it.
__________________
Bagram AF Afghanistan
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09-17-2007, 05:29 AM
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Backdraft Racing Dealer
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Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,124
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Not Ranked
His setup includes:
# 9.0:1 compression ratio (nominal)
# Forged pistons
# Hydraulic roller camshaft M-6250-Z303, .552" lift intake and exhaust, duration at .050" is 228 degrees intake and exhaust
# Ford Racing aluminum GT-40 cylinder heads M-6049-X305 with 1.94" intake valves and 1.54" exhaust valves
# Single plane “Victor Jr.” intake manifold M-9424-V351
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09-17-2007, 06:10 AM
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CC Member
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Join Date: Jul 2007
Location: Waterford,
PA
Cobra Make, Engine:
Posts: 1,384
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Not Ranked
thanks Jay, I think if it were me, I'd go with a better head before boost. Those heads are kinda pushing the small side for a 351.
__________________
Bagram AF Afghanistan
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09-17-2007, 06:44 AM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
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Not Ranked
With that head/intake/cam combo and optimal jetting and timing, he should already be at 410 -420.
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
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Utinam logica falsa tuam philosophiam totam suffodiant!
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09-17-2007, 06:52 AM
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CC Member
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Join Date: Mar 2000
Location: Fairfield, NJ, USA,
NJ
Cobra Make, Engine: A & C, 351W, Tremec 3550. Exiled Member: Club Cranky
Posts: 5,897
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Not Ranked
Did you dyno the car or are you just estimating? More times than not the estimate does not match the actual hp. The motor has to be tweeked to get it to the max based on your components. Then take it from there.
I recall when I first dyno'd my car it came in disappointingly low. I faxed the sheets to Barry Grant and they made several small suggestions. Went back to the dyno and picked up 40 hp.
Roscoe
__________________
Roscoe
"Crisis occurs when women and cattle get excited!"....James Thurber
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09-17-2007, 07:35 AM
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Senior Club Cobra Member
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Join Date: Jul 2007
Location: Odessa (Tampa),
FL
Cobra Make, Engine: BDR 559. 410 Stroker 72 block AFR205 Heads, Solid roller lifters, Comp Cams XR286, Eagle 4" stroke internally balanced with chevy journals, Oliver rods, Probe Forged pistons, Mighty Demon, Super Victor, MSD Digital 6.....
Posts: 260
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Not Ranked
My buddy had the exact motor in his BDR (ford racing crate) Put a good ignition on it (MSD), Nice holly with mechanicall secondaries, tweaked the timing and jetting and he was in the 410+ range...
__________________
BDR 559
Indigo Blue, White Stripes
SBF 410
TKO 600 .82 OD (Road Race)
HP= Enough!!
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09-17-2007, 09:52 AM
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CC Member
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Join Date: Dec 2004
Location: Yorba Linda,
CA
Cobra Make, Engine: FFR, V8, Manual Trans, Htr, Wipers, Radio Delete
Posts: 327
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Not Ranked
The Ford Racing 351-385HP crate motor actually dynos at about 410 ± 5HP with a Holley carb. If you want to get up to the 450 475 range with that bottom end you'll need more head flow and a different cam. There are a number of heads that will get the job done but some like the AFR 205s will require flycutting the pistons because of the 2.08 intake valve. You will want something that flows about 280CFM or better at .600 lift. The factory pistons will take a 2.02 intake valve with no machine work so you might be better off sticking with the Ford Z heads. You'll need to do a good multiangle valve job and maybe touch up the port to get the flow you want at high lift but they'll fit and they flow better at low and mid lift than many of the others which helps to preserve good driveability on the street. The Victor JRs also flow well but use a 2.05 intake valve so you may have piston to valve contact. Not sure about that. With any of these I heads I'd use a 232-240 @.050 .566/.574 on 108° intake centerline with either 110 or 112° LSA. Lastly take enough of a cut off the heads to get compression up to 9.5 to 1 and you'll have a pretty potent combination that will still drive well on the street.
Frank
Last edited by Frank Messina; 10-25-2007 at 09:36 AM..
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