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Old 12-09-2011, 03:10 PM   #106
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Default Re: pump gas 496

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Originally Posted by scott foxwell View Post
496 has a really short rod and a heavy piston, along with a small bore. I don't see it as a "high rpm" combination- not to say some aren't doing it or that you "can't" do it. I just think the returns are diminishing, but to answer your question, 8500rpm changes everything and yes, the bigger head would be more effecient. I wouldn't change the port for 150-300 shot of NOS, or for E85. Neither of those will "help" the bigger port.
I went and looked at the weight of my piston it is 650 grhams. I would not consider that heavy. If it was a 540 or 565 it would be considerably more. They have the same rod ratio and stroke as a 496 and they run up @ 8,500 R.P.M. and more all the time. That is a 1.59:1 rod ratio I think not so bad.

Last edited by Bolt; 12-09-2011 at 03:15 PM.
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Old 12-09-2011, 04:51 PM   #107
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Default Re: pump gas 496

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I went and looked at the weight of my piston it is 650 grhams. I would not consider that heavy. If it was a 540 or 565 it would be considerably more. They have the same rod ratio and stroke as a 496 and they run up @ 8,500 R.P.M. and more all the time. That is a 1.59:1 rod ratio I think not so bad.
Didn't say you couldn't, I just said the returns are diminshing. You're not taking into account the bore. How much more power do you think you'll make at 8500 than you will at 7200? The heads (mainly the intake valve) you'll need to turn that rpm will be completely compromised by the 4.31 bore unless they're a custom head designed for that application.
FYI a Mahle 38cc dome piston for a 540 weighs 590g, and the 565 piston weighs 624g.
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Old 12-09-2011, 06:16 PM   #108
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Default Re: pump gas 496

I see your point Scott. I probably shouldnt have used my pistons as an example as they are heavier than most 496 pistons wich wiegh in around 550 grams. Mine are heavier because of the domes.

My point is though I dont think its like the old days when you had a TRW slug @750 or 800 grams.

Could you show the math for a 8,500 RPM 496 for comparison sakes like you did a 7,200 RPM 496? I think it would be helpful to the thread!

Thanks
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Old 12-10-2011, 12:09 PM   #109
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Default Re: pump gas 496

So whats your guys thoughts of putting something like the Dart Oval 275cc Head on a 496?





Dart Pro 1 275cc Oval port

Lift Int Exh
.200 154 137
.300 225 175
.400 284 210
.500 318 233
.600 341 249
.700 352 258
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Old 12-10-2011, 12:31 PM   #110
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Default Re: pump gas 496

I know where you got that pic.........Scott.
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Hell no, big blocks are for dump trucks!!!
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Old 12-10-2011, 12:40 PM   #111
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I know where you got that pic.........Scott.
It was the only good one I could Find LOL
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Old 12-10-2011, 01:06 PM   #112
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Default Re: pump gas 496

I know that guy that owns that shop...............Ive used his dyno a bunch of times. Pretty cool fella!!!
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Old 12-10-2011, 02:55 PM   #113
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Default Re: pump gas 496

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Originally Posted by Scott McMullen View Post
So whats your guys thoughts of putting something like the Dart Oval 275cc Head on a 496?





Dart Pro 1 275cc Oval port

Lift Int Exh
.200 154 137
.300 225 175
.400 284 210
.500 318 233
.600 341 249
.700 352 258
Close to 3,000.00 dollars for a pair. You can do wonders with a pair of 049/781 for less money and not worry about header fit.
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Old 12-10-2011, 04:43 PM   #114
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Default Re: pump gas 496

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Close to 3,000.00 dollars for a pair. You can do wonders with a pair of 049/781 for less money and not worry about header fit.
x2
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Old 12-10-2011, 06:06 PM   #115
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Default Re: pump gas 496

Anyone want some 049/781 heads I have a set I no longer need.
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Old 12-10-2011, 09:10 PM   #116
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Default Re: pump gas 496

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Anyone want some 049/781 heads I have a set I no longer need.
What shape are they in ? I have been looking for a set.
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Old 12-10-2011, 10:05 PM   #117
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Default Re: pump gas 496

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Close to 3,000.00 dollars for a pair. You can do wonders with a pair of 049/781 for less money and not worry about header fit.

I think i have seen them before also, didnt think there were that much though. I would get a set of brodix race rites.
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Old 12-11-2011, 01:38 AM   #118
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Default Re: pump gas 496

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What shape are they in ? I have been looking for a set.

Pm sent
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Old 12-11-2011, 02:33 AM   #119
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Default Re: pump gas 496

Bolt, .. the 489 that I built for my now sold car, .. the RFD 24 jr heads (2.25" valve, 3.5 sq in ) , 282 .800" cam, JE pistons, . . 875 hp , .. is that good for these combos?
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Old 12-11-2011, 03:12 AM   #120
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Default Re: pump gas 496

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Bolt, .. the 489 that I built for my now sold car, .. the RFD 24 jr heads (2.25" valve, 3.5 sq in ) , 282 .800" cam, JE pistons, . . 875 hp , .. is that good for these combos?
He will need to run on pump gas and last approx 1000 miles of street drivng. WHat are the "jr" heads, did I miss them on your site?
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