For you 351C fans....turn up the volume!!!

blykins · #1 (**permalink**) 10-24-2017, 06:16 AM

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

FUNFER2 · #2 (**permalink**) 10-24-2017, 03:16 PM

Nice numbers, nice looking, nice build Brent.

KirkV · #3 (**permalink**) 10-24-2017, 05:25 PM

Wow nice numbers

Bill D · #4 (**permalink**) 10-24-2017, 08:06 PM

Schweet!

1795 · #5 (**permalink**) 10-25-2017, 07:44 AM

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

xb-60 · #6 (**permalink**) 10-25-2017, 04:27 PM

Oops. Got tangled up with forum speed issues

Loftonm · #7 (**permalink**) 10-25-2017, 04:52 PM

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 !!

blykins · #8 (**permalink**) 10-26-2017, 03:13 AM

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.

FUNFER2 · #9 (**permalink**) 10-26-2017, 04:49 AM

Well, just use av-gas and drive on the steet at 5,000 RPM. Problem solved.

lovehamr · #10 (**permalink**) 10-26-2017, 09:26 AM

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.

blykins · #11 (**permalink**) 10-26-2017, 09:47 AM

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.

RodKnock · #12 (**permalink**) 10-26-2017, 10:44 AM

You should post it on a Pantera forum, if one exists. I assume there's one out there.

cycleguy55 · #13 (**permalink**) 10-26-2017, 11:15 AM

Quote:

Originally Posted by RodKnock

You should post it on a Pantera forum, if one exists. I assume there's one out there.

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.

blykins · #14 (**permalink**) 10-26-2017, 11:37 AM

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.

eschaider · #15 (**permalink**) 10-26-2017, 03:13 PM

Very impressive, Brent.

How muted is the low speed performance?

Ed

blykins · #16 (**permalink**) 10-26-2017, 07:02 PM

Had 600 lb-ft of torque at 1800 rpm and idled at 700 with the A/C on.

Racer_X · #17 (**permalink**) 10-26-2017, 08:31 PM

deleted-double posted due to server speed

Racer_X · #18 (**permalink**) 10-26-2017, 08:33 PM

Very, very nice Brent. There's a special place in my heart for Cleveland engines.
What bottom end does it have? What crank? Girdle?

eschaider · #19 (**permalink**) 10-27-2017, 10:21 AM

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

blykins · #20 (**permalink**) 10-27-2017, 01:05 PM

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.