700hp 493 build specs thoughts

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fishmens67 said:
There is guy South of me that made 787 HP with a pump gas 451.
Before he retired, we had frequent earthquakes on dyno day. lol
We could feel it up here in the LC valley.
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That's rippin
 
Rat Bastid said:
Thats too bad because he gave up quite a bit believing pump gas CR doesnt matter and the chart that shows a 1-2% gain from raising the CR from say 10:1 to 11:1 which isn’t true.
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You can make good hp at low CR though, go big is one way, as an example>
An engine my other mate bought for his street/strip RR
589ci, 10:1, CP between 185>190psi, 365CNC -13's, small s/roller, 260/[email protected], .625/.625" on 110
440-2, 950HPDP. 695hp@5500-5900.
But I will say that if it was 12.5:1 with a healthy 750+" [email protected] roller
it would be around the 800hp mark, wouldn't work for street though too good.
And of course AndyF's 10.5:1 470 but that did have some expensive trick parts and wouldn't be too street able either pump or not.
And that is the scenario we have with this build, keeping it relatively street friendly which is why he should've gone for more stroke.
 
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Hot Metal said:
You can make good hp at low CR though, go big is one way, as an example>
An engine my other mate bought for his street/strip RR
589ci, 10:1, CP between 185>190psi, 365CNC -13's, small s/roller, 260/[email protected], .625/.625" on 110
440-2, 950HPDP. 695hp@5500-5900.
But I will say that if it was 12.5:1 with a healthy 730+" [email protected] roller
it would be around the 800hp mark, wouldn't work for street though too good.
Click to expand...

I never said you can’t are power with a compression ratio that low. But why give up power?

In your example, that engine at 11:5.1 would make another 40-45 HP. Seems like a no brainer to me.

EDIT: not to mention power under the cure and driveability. There is way more to compression ratio than just horsepower. And it kills me to say that because horsepower is KING.
 
Rat Bastid said:
I never said you can’t are power with a compression ratio that low. But why give up power?

In your example, that engine at 11:5.1 would make another 40-45 HP. Seems like a no brainer to me.

EDIT: not to mention power under the cure and driveability. There is way more to compression ratio than just horsepower. And it kills me to say that because horsepower is KING.
Click to expand...
I know you didn't, I agree with your CR theory, its just an example of how you can do it on low cr when you do not have a full on race engine designed. It all comes down to use. Although it can still be done on high cr if you pick the right cam for some street use as Dom and others have shown within reason, we can all put up with a full on race motor for a while on the street but this thread is about a street/strip build, down to the owner as always and where his mentality is.
 
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fishmens67 said:
There is guy South of me that made 787 HP with a pump gas 451.
Before he retired, we had frequent earthquakes on dyno day. lol
We could feel it up here in the LC valley.
Click to expand...
Jim's ( IQ52) 451 made 787HP with 9.5:1 comp
and ported Edelbrock heads on pump swill.
 
My racing buddy has a 440 based 493 that made 782. It is 12.5 comp. 270 heads lunati 276 284 @.050 .690 lift cam. Times convert to 760 hp so pretty close.
 
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