Nostalgia Superstock 67 Fairlane

[KeiserMustang]

Thought I'd start a post on my NSS 67 Fairlane project.  It's been underway for quite awhile, but I finally ran the engine on the dyno yesterday.  I'll post some catch up pictures later...





688 HP @ 6700 rpm
580 ft-lbs @ 5300 rpm

[machoneman]

Nice! We need engine specs too........

[My427stang]

That should haul the mail!

[jayb]

Nice numbers, and a great looking engine.  I'm looking at the kink in the HP curve up top; the discontinuity indicates that you are losing control of the valvetrain at that point.  I've run across that problem quite a few times; in the link below you can see the same issue with an engine I built several years ago with a solid roller cam.

http://www.fepower.net/Dyno%20Results/dyno_results_8.html

If you are going to run the engine that high in the RPM range I'd be looking at stiffer valvesprings...

[ScotiaFE]

Which cam was that Jay?

Nice looking wedge there.

[jayb]

It was a Comp Solid roller, one of their Extreme Energy series.  Lift was around .710, duration 272@.050".

[philminotti]

Nice water pump adapters!

[KeiserMustang]

Jay, thanks for the feedback on the valve springs.  Here's some more info on the cam and the springs.

Here's the cam specs:


Valve springs are Comp Cams 955's...1.550" o.d., 240 lbs @ 2.000" installed height, 526 lb/in rate, 608 lbs open @ 1.300"

Thoughts on a better spring?

[Barry_R]

I agree on the valvetrain issue.  A hard drop like that indicates float.  If you are truly at 2.00" installed height you only have 570ish open.  Do you have titanium or tool steel retainers?  They help a lot.  I run a lot of Manley Nextec 221443 springs for oval track stuff.  It gives about 235 seat at 1.960 and 610ish open with a .750 max lift and goes cleanly over 7000 with TI or tool steel retainers.

[KeiserMustang]

Titanium retainers...

[KeiserMustang]

Engine is a 462 that started with a 428 block.  I did all the port work on the heads and intake.  Comp solid roller, T&D rockers, Diamond pistons, SCAT rotating assembly.

The goal was to make around 600 HP...   It made 688 with only timing adjustments. Not sure it won't make 700 with the valve spring swap. 

I saw the same thing on a buddy's engine a few years ago.  HP and TRQ dropped sporadically at the top of the RPM range.  A valve spring swap smoothed it out and it picked up about 20 HP.

Realistically the HP is not what I'm after, but stabilizing the valve train and keeping the engine alive is more important.

[jayb]

I'm kind of surprised that those springs won't handle that cam, especially with titanium retainers.  I think I'd try shimming them, maybe go to a 1.95" installed height using -.050" locks, assuming you have the room over the valve seal.  Alternatively, maybe a Pacalloy spring that's a step up...

[BH107]

Awesome!

What did the heads flow when you were done with them?

[mlcraven]

The alternator bracket set-up..your own design/fabrication or sourced through a vendor?

[KeiserMustang]

Heads flowed 309 on the intake up to .650" then flow went away.  This was on a 4.155" bore.  Exhaust flowed 270+ and kept going up to .700"