Are AFR 205's bolt on for 392W?

[efrost]

Originally Posted by CHRIS DAMSCH

Ed,

Call Dennis at Olthoff Racing (spf Dealer) and ask him about the larger 351 headers. When I talked to him, he said there isn't a large difference in power (about 10hp at 5500rpm, but loss of tq down low). He was the one making the headers.

Dennis is very pleasant to talk too and very informative with these types of questions.

Thanks for the info... I talked to Dennis a month or so ago about the possibility of switching my Roush/Dart 195 heads to the AFR 185 Comp’s or 205's and adding the larger port headers to compensate for the AFR ports and his advice was to run what I have because the increase in hp/tq wasn't worth it. It’s his opinion, in my particular case, the expense and efforts simply aren't worth the gains. The dollars per horse power are in the $35/hp range. I believe Dennis has just a little more experience with these cars and performance motors than I do. My experience is limited to one Cobra, 6000 miles and zero track experience.

In short I have done nothing but enjoy my machine. As mention earlier I do plan to have the car dyno'ed to confirm the air/fuel ratio over the rpm range. The side benefit will confirm the drive train losses based on the engine dyno number from Roush.

I’m still following the head swap articles with great interest.

Thanks again,

Ed

[Madmiles442]

Ed,
Your Roush heads flow a lot better than my Ford Motorsport GT-40 heads. Your HP gains might not be as large as what I would get. I anticipate a gain of 50-60 HP going to the AFR 205's. Then if I was to redo the headers and sidepipe, get another 30-40.
Heads $2000/60 = $33.33/hp
Exhaust $2000/40 = $50.00/hp
Of course, spending $4k is nearly halfway to a Keith Craft 408 with 525 horse and a stronger bottom end.

[efrost]

Originally Posted by Madmiles442

Ed,
Your Roush heads flow a lot better than my Ford Motorsport GT-40 heads. Your HP gains might not be as large as what I would get. I anticipate a gain of 50-60 HP going to the AFR 205's. Then if I was to redo the headers and sidepipe, get another 30-40.
Heads $2000/60 = $33.33/hp
Exhaust $2000/40 = $50.00/hp
Of course, spending $4k is nearly halfway to a Keith Craft 408 with 525 horse and a stronger bottom end.

My thoughts exactly on the new engine.... I'm going to sit on the sidelines for now and enjoy the 448hp/484tq of my current engine. More is always better but the capabilities of this setup far exceed my ability to drive. A performance driving school is definitely in my future.

Just keeping it pointed straight and between the ditches is the goal for now.

Ed

[Mark Brye]

Always check the Valve clearance!!!!!! You can read my posts in the small block forum when I put AFR 185 heads on my 2006 FMS392. Ran into lots of problems. But, in the end they added over 100hp.

[jdean]

[Mark Brye]

We used a cutting tool like the one shown. We made ours out of an old valve. But, without pulling the engine, how do you balance the engine afterwards? Chances are, you will throw the balance of the engine off unless you can take the same amount of material out of each piston.

[CobraEd]

Originally Posted by Mark Brye

But, without pulling the engine, how do you balance the engine afterwards? Chances are, you will throw the balance of the engine off unless you can take the same amount of material out of each piston.

And each crank counterweight!


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