Thread: advice on 489

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Originally Posted by cvfb97

thank you for spelling it out for me techinspector. All i have is block thats .030 over stock stroke crank. was looking at a scat 489 rotating assembly for everything for the bottom end. if i do get the stock sized rods and my crank is decent enough to run, how much power would you guestimate it to put out?

Judging by dyno tests run with very close to this combo, same engine size, Performer RPM, same heads and nearly the same cam, Holley 950 Ultra HP 4150-series carburetor, 600 hp @6100, 580 ft/lbs @4200. Deduct 5% for the smaller carburetor and end up with 570 horsepower and 550 ft/lbs. A 150 shot of juice would put it at 720 and 700. Figure $650 for the juice. Stalling the converter at 3000 rpm's shows 508 ft/lbs without the juice, 658 @3000 with it. i think it would take a blower to drive around you.

Most everybody is fooled by the small oval port AFR heads. With 265 cc intake runners, you might think that they would be just right for haulin' grandma to bingo and back, but AFR has hit a home run with these little jewels. I don't know, I might trade off the 800 for a 950...... 600/580 is mighty attractive to me, naturally aspirated.

You also have to consider that they tuned the living hell out of the motor on the dyno, so you may have a considerable amount of tweakin' to do after you get it running. Change one thing at a time and then test.
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considering there arent a whole lot of fast street cars in my neck of the woods, even 550 would great. Seeing as how i havent purchased anything as of yet, a 950 isnt out of the question. thank you for the advice