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 8Likes
10-24-2017, 07:16 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
For you 351C fans....turn up the volume!!!
This is a stock stroke, factory headed, custom 351C engine that I dyno'd this past week. 615 hp @ 8000....
https://www.youtube.com/watch?v=lIpAUnqZmKw |
10-24-2017, 04:16 PM
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CC Member
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Join Date: Oct 2002
Location: Eagle,
Ne.
Cobra Make, Engine: 1966 Lone Star 427SC.
Posts: 4,307
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Not Ranked
Nice numbers, nice looking, nice build Brent. 
__________________
Regards,
Kevin
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10-24-2017, 06:25 PM
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CC Member
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Join Date: Jul 2011
Location: Peoria Illinois,
il
Cobra Make, Engine: Superformance #678
Posts: 264
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Not Ranked
Wow nice numbers
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10-24-2017, 09:06 PM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
Schweet!
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10-25-2017, 08:44 AM
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CC Member
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Join Date: Aug 2013
Location: Canandaigua,
NY
Cobra Make, Engine: SPF MKII Riverside Racer FIA
Posts: 2,499
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Not Ranked
Nice work Brent! Sounds great! It takes special skill to get an engine to reliably run at 8,000 rpms. Your customer will be quite happy.
Jim
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10-25-2017, 05:27 PM
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CC Member
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Join Date: Aug 2009
Location: Adelaide,
SA
Cobra Make, Engine: AP 289FIA 'English' spec.
Posts: 13,151
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Not Ranked
Oops. Got tangled up with forum speed issues
Last edited by xb-60; 10-25-2017 at 05:32 PM..
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10-25-2017, 05:52 PM
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Registered User
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Join Date: May 2017
Cobra Make, Engine: BDR #359/ 427R/ Tremec/ 3.91 LSD
Posts: 3
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Not Ranked
How would the build cost compare to a Windsor?
Would be interested Brent in how the build cost would compare to a 427 Windsor ?
Also what would this beast do with a good set of heads and 427 cubes?
Thanks Brent for sharing !
Impressive !!
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10-26-2017, 04:13 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
A couple of points here:
This engine would not be fun at all on the street. It's a very peaky engine, with an 8000 rpm horsepower peak. It's also 12:1 compression, which means that it would need gas mixed, need to be ran on race gas, or need to be ran on E85.
I built this engine for myself, as a dyno mule, and for a future project. It's a testament to *how good* factory 4V Cleveland heads are. The heads have not been ported, but only have a set of Ferrea valves, along with a really nice valve job. They still flow over 300 cfm at lift. This is essentially a stock block, stock headed engine, with an unported Strip Dominator intake, one of my custom solid roller camshafts, and some half-way fancy rotating assembly components that normal people wouldn't use. You normally don't see a 351C with a 6.400" length SBC connecting rod. 
If it were not for the absence of headers for Cleveland applications, I would be steering a lot of my Cobra customers this direction. An inline valve head (Windsor) will only make so much horsepower and the canted valve layout will support huge numbers. |
10-26-2017, 05:49 AM
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CC Member
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Join Date: Oct 2002
Location: Eagle,
Ne.
Cobra Make, Engine: 1966 Lone Star 427SC.
Posts: 4,307
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Not Ranked
Well, just use av-gas and drive on the steet at 5,000 RPM. Problem solved.
__________________
Regards,
Kevin
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10-26-2017, 10:26 AM
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Stolen Avitar
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Join Date: Oct 2004
Location: Brunswick,
GA
Cobra Make, Engine: BDR 1311 428PI
Posts: 3,044
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Not Ranked
Brent, you mentioned the intake flow but what about the exhaust? Flow-wise it's my understanding that the stock C's Achilles heel is there.
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10-26-2017, 10:47 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
It's only an Achilles heel if you don't adjust for it. That's what custom camshafts are for.
The Cleveland exhaust flow is bad, about the same as a Tunnel Port FE head. This one did about 188 cfm @ .750" lift with no pipe.
Obviously, I didn't tell it that it had a bad exhaust port design. |
10-26-2017, 11:44 AM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,591
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Not Ranked
You should post it on a Pantera forum, if one exists. I assume there's one out there.
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10-26-2017, 12:15 PM
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CC Member
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Join Date: Feb 2014
Location: White City,
SK
Cobra Make, Engine: West Coast, 460 CID
Posts: 2,908
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Not Ranked
Quote:
Originally Posted by RodKnock
You should post it on a Pantera forum, if one exists. I assume there's one out there.
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I know someone with a Pantera running a 408C and Webers - about 500 HP. I'm sure he'd be intrigued by the HP, but not about the drivability.
__________________
Brian
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10-26-2017, 12:37 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
A 550-600 hp 408C is very common and is very streetable. It's easy to crank those out, as it's easy to crank out 427-460 inch Clevors that make over 700 hp on pump gas.
However, sometimes you just wanna do something a little out of the ordinary. I will admit that I like trying to make the small displacement engines run hard.
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10-26-2017, 04:13 PM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,726
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Not Ranked
Very impressive, Brent.
How muted is the low speed performance?
Ed
__________________
Help them do what they would have done if they had known what they could do.
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10-26-2017, 08:02 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Had 600 lb-ft of torque at 1800 rpm and idled at 700 with the A/C on.  |
10-26-2017, 09:31 PM
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CC Member
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Join Date: May 2010
Location: Houston,
tx
Cobra Make, Engine: 2004 Kirkham 427 S/C, Shelby 496C.I.
Posts: 322
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Not Ranked
deleted-double posted due to server speed
Last edited by Racer_X; 10-26-2017 at 09:39 PM..
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10-26-2017, 09:33 PM
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CC Member
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Join Date: May 2010
Location: Houston,
tx
Cobra Make, Engine: 2004 Kirkham 427 S/C, Shelby 496C.I.
Posts: 322
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Not Ranked
Very, very nice Brent. There's a special place in my heart for Cleveland engines.
What bottom end does it have? What crank? Girdle?
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10-27-2017, 11:21 AM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,726
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Not Ranked
Quote:
Originally Posted by blykins
Had 600 lb-ft of torque at 1800 rpm and idled at 700 with the A/C on. |
WOW, that is impressive, Brent!
600 ft/lbs at 1800 rpm is supercharged engine low speed torque. I would not have anticipated that much torque at that rpm from a n/a 351 inch engine.
Ed
__________________
Help them do what they would have done if they had known what they could do.
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10-27-2017, 02:05 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Ed, I hope you know that was a very tongue-in-cheek reply. We didn't even pull this one down below 4000 rpm. No need to.
Racer_X, no main cap girdle. It has ARP main studs in the bottom end, a Superlight Scat crank that I bought for $350, and a set of Molnar 6.400" SBC rods.
I just pulled the heads and intake off so that they can be ported. I pulled the pan too, the coating had come off of my new Milodon pan with just a shop towel....
While the pan was off, I checked a few bearings. The main bearings still had my mic tracks on them. The rod bearings looked like they had just come out of the box. That was with 14-15 pulls at 8500 rpm and a standard volume/standard pressure oil pump. At 8500 rpm, we were still seeing almost 70 psi of pressure at the rear of the block. |
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