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800 HP with AFR oval 290's or 300's?

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Discussion starter · #26 ·
VORTECPRO said:
I have to ask what you trying to do? How fast are you now? Have you maxed out your current combination?
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Truck has been 7.15 @ 95 in the 1/8 on a 1.56 60, which is roughly 11.25 according the calculators. I would guess I can get at least 7.0 out of it. Truck weighs 4450 w/driver. I'd like it to go low 10's...........
 
#27 ·
-SS454- said:
Considering crazydavy's 509 made north of 750 hp with a set of AFR 315s, I certainly think with a 540, 800 ponies is doable... even with a single carb.

IMO, go with the 540 for the torque, and instead of focusing on "800 horsepower", I would focus on a broad torque curve to help move that heavy car.

If going ovals, dont bother with the AFR 290s, Tony Mamo says the 300s are much better.
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Davey's heads were AFR305 that have about 100Hours of Foxy Work. They out flow the 315's and are around 311cc.

Heads don't make an engine run, a combination of parts makes an engine run.

The 290's box stock have the capability of making 800HP. Math says 799HP. Building the combination to to achieve that is the trick.
 
#28 ·
First, there is a big difference between trying to make 800hp with a 496 vs a 540. Second, there is no way you would use (or compare) the same heads on both combinations as they're two entirely different builds. I would not recommend trying to make 800hp with 290's on a pg 540. Can it be done? Sure, but why? There are much easier ways. The 290's on a 496 are a much better choice, but making 800hp with any head on a pg 496 is already a formidable task.
JMO
 
#29 ·
steelcomp said:
First, there is a big difference between trying to make 800hp with a 496 vs a 540. Second, there is no way you would use (or compare) the same heads on both combinations as they're two entirely different builds. I would not recommend trying to make 800hp with 290's on a pg 540. Can it be done? Sure, but why? There are much easier ways. The 290's on a 496 are a much better choice, but making 800hp with any head on a pg 496 is already a formidable task.
JMO
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How about a 505, 280's and 14:1?? :D
 
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#33 ·
#35 ·
The one thing to consider is the validity of a lot of the Dyno numbers floating around. I hate corrected numbers, look at incorrect to see what you really have. The 540 I posted runs 8.90s at Super Street minimum weight. For yours with the weight you have go with the largest stroke you can easily use, it will make more difference in ET than any other change.
 
#36 ·
jmarkaudio said:
The one thing to consider is the validity of a lot of the Dyno numbers floating around. I hate corrected numbers, look at incorrect to see what you really have. The 540 I posted runs 8.90s at Super Street minimum weight. For yours with the weight you have go with the largest stroke you can easily use, it will make more difference in ET than any other change.
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NHRA Super Street that is 2800 lb. min weight and 10.90 Index?
 
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#37 ·
jmarkaudio said:
The one thing to consider is the validity of a lot of the Dyno numbers floating around. I hate corrected numbers, look at incorrect to see what you really have. The 540 I posted runs 8.90s at Super Street minimum weight. For yours with the weight you have go with the largest stroke you can easily use, it will make more difference in ET than any other change.
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Exactly What did this car MPH and ET?
 
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#38 ·
jmarkaudio said:
The one thing to consider is the validity of a lot of the Dyno numbers floating around. I hate corrected numbers, look at incorrect to see what you really have. The 540 I posted runs 8.90s at Super Street minimum weight. For yours with the weight you have go with the largest stroke you can easily use, it will make more difference in ET than any other change.
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Would that be the observed number at 8:00 am, or 4:30 pm? The whole purpose of corrected numbers is to make a reasonable comparison between dynos. Whether or not the dyno is properly calibrated and the test done correctly is another discussion. Accuracy of information should be the goal but unfortunately that's all too often not the case. It's easy to get caught up in the numbers game.
On the stroke thing...there are definitely benefits to more stroke, but you better be willing to pay the piper to get the most out of it. Adding stroke without addressing some of the issues can end up being a net loss.
 
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VORTECPRO
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