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Discussion Starter · #1 · (Edited)
4.500 Bore
6.800 Long Rod
3.5 Stroke
Dart Aluminum Block (Weight)
Straub VEPR Head Program 290cc Square Ports
Straub Solid Roller
Morel Solid Roller Lifters with pressure fed oiling
Eddy Dual Plane (Hood Clearance)
Holley Sniper Kit (4150)
Pump gas 10 to 1
Goal was 600HP
Application (Spirted driving in the mountains of Turkey)

623HP at 6500
572#/ft at 4600

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Nice build, but the mountains in Turkey that’s 9000 plus feet elevation. Boosted would have been my choice. 623 hp at sea level great street car. 9000 feet up a mountain and it becomes a 13-14 second slug.
 
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Curious why power lays over around 6200 rpm.

Would have guessed higher rpm’s based on short stroke, ported heads and solid roller.
Valve float??? Maybe tuning...Would have to see the log. @600 hp it might be running out of fuel(doubtful, should be good to 650 on pump gas) or what i just calculated.....AIR!!!! depending on the sniper model. Math on a 800 CFM sniper at the size engine literally runs out of air flow around 6200..


Cubic inch divided by two
Multiply by rpm
Divide by (12) 3 times equals CFM requirement.
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Valve float??? Maybe tuning...Would have to see the log. @600 hp it might be running out of fuel(doubtful, should be good to 650 on pump gas) or what i just calculated.....AIR!!!! depending on the sniper model. Math on a 800 CFM sniper at the size engine literally runs out of air flow around 6200..


Cubic inch divided by two
Multiply by rpm
Divide by (12) 3 times equals CFM requirement.
Sent from my SM-S908U using Tapatalk
Yeah if that throttle body is only 800 cfm it is undersized. Bigger the better. Two 800’s would be ok. Any vacuum readings at WOT and max rpm?
 

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My worked 750 pulled a vacuum at 6700 with a little less of a engine @ 439 ci. Need the 850 , which surprised me. As did 118.75 mph in the 1/4 mi. ( it took ALOT of playing around to get it easy to dirve and not piggy tho! - maybe same here, great street manners with 800 alone - to customers spec?)

Still a fine pull ! 600+ from a short stroke, even with a tad -o-bore, is very good!
 

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My worked 750 pulled a vacuum at 6700 with a little less of a engine @ 439 ci. Need the 850 , which surprised me. As did 118.75 mph in the 1/4 mi. ( it took ALOT of playing around to get it easy to dirve and not piggy tho! - maybe same here, great street manners with 800 alone - to customers spec?)

Still a fine pull ! 600+ from a short stroke, even with a tad -o-bore, is very good!
I will be running a 112 mm on a 572 which is the biggest I could find in drive by wire without going to two. Neat thing is a DBW is infinitely adjustable for pedal feel and opening rate. You should stop by and check it out You pass my house every time you make a right out of your street.
 

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My worked 750 pulled a vacuum at 6700 with a little less of a engine @ 439 ci. Need the 850 , which surprised me. As did 118.75 mph in the 1/4 mi. ( it took ALOT of playing around to get it easy to dirve and not piggy tho! - maybe same here, great street manners with 800 alone - to customers spec?)

Still a fine pull ! 600+ from a short stroke, even with a tad -o-bore, is very good!
439 equates to needing an 851 at 6700..


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Also anyone putting bigger than a 650 on a street built 350 is overkilling it. Who runs a steet 350 past 6500 and cares about a few ponies? I'd be more worried of the fact some guy cares more about their carb size than max piston velocity.. lol

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Also anyone putting bigger than a 650 on a street built 350 is overkilling it. Who runs a steet 350 past 6500 and cares about a few ponies? I'd be more worried of the fact some guy cares more about their carb size than max piston velocity.. lol

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My pump gas 358 engine which I can run on the street and day of the week like my FST 850 carburetor. This one was a tenth and a half quicker over my 1000 Mighty Demon, ya the 1000 was a tad big on this engine but it still managed a [email protected]
 

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About 6600 rpm
Single or dual plane?

Carb size is just 1 equation of achieving optimal cost effective, drivability, etc...

Intakes, spacers, compression, cam, vehicle weight...all have had quantitative results in using different cfm carbs to achieve power. Everyone tries to achieve perfection, but there is no such thing....

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