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Old 02-24-2012, 11:37 PM   #16
slow87GT
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Default Re: Max effort 496 (Too much head?)

what would happen if the head was a little on the big side?
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Old 02-25-2012, 01:35 AM   #17
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Default Re: Max effort 496 (Too much head?)

^spray it!^
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Old 02-25-2012, 03:05 AM   #18
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Default Re: Max effort 496 (Too much head?)

IVO 60.0
EVO 70.5
108 LSA

Dyno2003 predicts FWHP: 975HP@ 7500 and 760TQ@6000

A 20% drivetrain loss would be 770~ to the tire and 600 TQ.

Scott, should I try revising the cam a little more?[/QUOTE]



Id say your desktop dyno is a little happy. The baddest 496 I ever saw had more head more cam and was on Q16. Made 880 something on a well known dyno. Not saying it can't be done but I sure don't see it. My builds sorta close to yours with more compression 748 roller cam max ported dart 320heads and Id be happy with 750hp before nitrous.
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Old 02-25-2012, 06:58 AM   #19
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Default Re: Max effort 496 (Too much head?)

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Originally Posted by slow87GT View Post
what would happen if the head was a little on the big side?
It would be a little less power output at lower rpm's but take off like crazy above 7000 rpm's. Big block's to love rpm in a light vehicle, and hardly works the engine. For a heavy chassis, you need the torque down low to get the weight moving and some good hp to keep it going once the weight is overcome, and it is a balancing act for sure. Many many guys have done this too so it is doable.
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Old 02-25-2012, 09:44 AM   #20
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Default Re: Max effort 496 (Too much head?)

After helping out Pep with his 383, I think an Engine on E85 needs a bigger csa intake port.than an engine on gasoline.

I wouldnt put a head on this thing smaller than 320.
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Old 02-25-2012, 11:50 AM   #21
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Default Re: Max effort 496 (Too much head?)

Quote:
Originally Posted by HardonParts View Post
Id say your desktop dyno is a little happy. The baddest 496 I ever saw had more head more cam and was on Q16. Made 880 something on a well known dyno. Not saying it can't be done but I sure don't see it. My builds sorta close to yours with more compression 748 roller cam max ported dart 320heads and Id be happy with 750hp before nitrous.
I agree... there are 496s that will make 950+ but they are pretty killer setups to do so.
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Old 02-25-2012, 12:12 PM   #22
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Default Re: Max effort 496 (Too much head?)

I don't have alot of experience with BBC but is it not possible to make 2.0 hp per cubic inch? I see alot of 498/505 claiming 750 to 850 which puts it at around 1.5 to 1.7 hp per cubic in! Sounds like pump gas street motors to me.
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Old 02-25-2012, 12:46 PM   #23
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Default Re: Max effort 496 (Too much head?)

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Originally Posted by LilJohn View Post
After helping out Pep with his 383, I think an Engine on E85 needs a bigger csa intake port.than an engine on gasoline.

I wouldnt put a head on this thing smaller than 320.
Why?
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Old 02-25-2012, 01:17 PM   #24
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Default Re: Max effort 496 (Too much head?)

Mine makes 890ish,DART 355 CNC.If thats Not a Big Head,what is,.............?

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Old 02-25-2012, 01:28 PM   #25
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Default Re: Max effort 496 (Too much head?)

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Mine makes 890ish,DART 355 CNC.If thats Not a Big Head,what is,.............?

Later
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Well there you have it.
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Old 02-26-2012, 12:53 AM   #26
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Default Re: Max effort 496 (Too much head?)

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Originally Posted by scott foxwell View Post
Why?
I'm takin a wild guess here but maybe there's a considerable more amount of fuel with e85 vs gas.

Was helpin a guy with a dirt track late model and he had a alcohol an a gas motor built real similar but The engine builder did two totally diff port jobs and the alch motor had a slightly larger port vs the gas I remember the cams were slightly diff as well and this was a big time roundy round builder...they made close to the same power tho.
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Old 02-26-2012, 08:31 AM   #27
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Default Re: Max effort 496 (Too much head?)

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Originally Posted by ZXrider View Post
I don't have alot of experience with BBC but is it not possible to make 2.0 hp per cubic inch? I see alot of 498/505 claiming 750 to 850 which puts it at around 1.5 to 1.7 hp per cubic in! Sounds like pump gas street motors to me.

Define a street Engine!!! and there is truth to power numbers too
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Old 02-26-2012, 09:31 AM   #28
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Default Re: Max effort 496 (Too much head?)

I have a Dart 355 on our 496 nitrous motor.......
also added a 1150 dom and a big fat daddy nitrous jet

wish me luck
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Old 02-26-2012, 09:39 AM   #29
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Default Re: Max effort 496 (Too much head?)

No such thing as too big of a head. Just not enough RPM.
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Old 02-26-2012, 09:58 AM   #30
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Default Re: Max effort 496 (Too much head?)

Quote:
Originally Posted by John Wilson View Post
This is just for the OP's reference. The 496 currently in my 67 is 10.8:1 with ported GM 781's and a mild solid roller. It makes pk hp from 6800-7000. On it's first and only full pass with my foot down the entire 1320 it went 9.56 at ~+3615Lbs. I kept the timing dialed down while I get a feel for the suspension tune-up.

Just offering up what can be done with a "small" head.
How much portwork was done to your 781's?
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