Guess the horsepower on a little pepped-up 390....

[My427stang]

Well done!

Pretty wild that an iron headed 390 is pulling numbers and RPM that in the golden years very few 427s would live through.

It does go to show you though, whether it's a SOHC or TFS headed engine, heads make power.  I really liked this experiments and looking forward to seeing how moving valve events around change things.

[Drew Pojedinec]

Lol, no issue with VS opening. Went a lil flat when they did tho. I’d have to see how it does in a car, would be nice to slow the rate a bit.

Did you get to test those 725’s ya had?
Do you have a dyno sheet with a/f numbers and whatnot?

[shady]

Oh boy oh boy, I'm at a loss for words. Ya had me CJ and lifted at the far end. Brent, I think you should send the goody bag to CJ and you & I can work something out. I'll be looking for a lot of so called free advice.

[plovett]

Neato!  That's an overperforming 390, for sure.  And most importantly, you verified your theories on FE hydraulic roller valve train control.  I am sure that will pay dividends on many future builds.

paulie

[machoneman]

At 542 hp corrected, I was close! 

Not so on the rpms though. 

551 hp @ 6,675 rpm, 497 ft/lbs. My last change with new cam data! 

Opphs! Missed the rpm factor. See above.....

[blykins]

Lol, no issue with VS opening. Went a lil flat when they did tho. I’d have to see how it does in a car, would be nice to slow the rate a bit.

Did you get to test those 725’s ya had?
Do you have a dyno sheet with a/f numbers and whatnot?

Drew, I have data that you and I can sit down and discuss later on.   The A/F ratios were rich starting out, which I expected them to be, not only because it's best to set new carbs up on the safe side, but it's hard to know how efficient an engine is going to be.

The secondaries were definitely opening, and I wouldn't worry about the flat spot.  On a manually valved Stuska dyno, it's very hard to get the engine up and going and then recover quickly when the secondaries open.  That flat spot wouldn't be there anywhere else and I see it with about every 2x4 setup with similar carbs.

I was very pleased with the carbs.  Nice work.

[blykins]

I just disassembled the rocker arm assemblies and checked everything out.  With .0012-.0013" of rocker to shaft clearance, the shafts still looked brand new and the rocker arm bushings looked brand new. 

[RustyCrankshaft]

Harland Sharp's stuff has been pretty good to me as far as reliability goes so I'd expect no less from yours. Could run those at 8000 in a roadrace car all day and they'd still look good I bet!

[62Falcon390]

i was real close

[62Falcon390]

540@6850

 

[Katz427]

I guess this is more a Brent question. Interesting that you ran 5w-20 and a high volume pump. I have run high and standard volume in the past on FE motors, but usually 10w-40 (or 20w-40 with solids). What was the thinking for the high volume pump?

[wowens]

Man, only missed by 250 rpm, oh yeah, 110 hp too

[My427stang]

540@6850

 

RTFI ......

Read the friendly instructions LOL

Another "guess the horsepower" game.  Same rules as the last ones.....closest without going over wins some Lykins Motorsports paraphernalia.   Again, as before, I will be posting UNCORRECTED numbers, so use that little tid-bid in your final guess. 

Of course, just teasing.  Good guess, just wrong ruler

[62Falcon390]

yeah I know, close though

[blykins]

I guess this is more a Brent question. Interesting that you ran 5w-20 and a high volume pump. I have run high and standard volume in the past on FE motors, but usually 10w-40 (or 20w-40 with solids). What was the thinking for the high volume pump?

I used the HV pump for several reasons.  The main one was the oil viscosity combined with the bearing clearances.  The short travel lifters need a low viscosity oil, but my main/rod bearing clearances were on the loose side.  The second reason is that I wanted to make sure I had enough volume at high rpm to keep the bearings lubed, in addition to keeping the lifters pumped up and the rocker arm bushings lubricated.

Normally on FE's, I will run a standard volume/standard pressure pump, but this engine was a new learning curve for me, so I wanted to make sure that I had plenty of everything.