LD340 flow testing

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I remember that post. Good one.
I found along the same, that ld340 will support some respectable power in 500's with work and an easy 450 ....and the vic340 ...it needs a lot of work.
 
MOPAROFFICIAL said:
Bought one used on here and one runner went 245-247 cfm untouched on 273 cfm int port. LoL after g/m, runner at plenum work and flange it flowed within a few cfm through the range
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I saw 315 cfm out of one bolted on an Edelbrock Head and from that day on I was in love.
 
Dang, late to the party. I got some catchin' up to do.
 
pittsburghracer said:
i don’t think I posted this here before but here’s a post I did years ago testing an LD340 for a buddy I did a set of heads for. Sorry but photobucket charged their ransom for our pictures so they aren’t available

Ld 340 flow bench test results
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Thanks that was a good read
That's what i'm trying to decide is, port work on the LD340 or just jump into a single plain manifold and call it good.
It has already been opened up for a spread bore carb, so there is a little room to play with shaping in the plenum.
 
The ld340 is very mismatched as cast.
It only gets better as you work with it.
The carb flange match to the runner gasket match...then test and find the least flowing runner/s and focus on working those up to the others.
Balance.
 
pittsburghracer said:
i don’t think I posted this here before but here’s a post I did years ago testing an LD340 for a buddy I did a set of heads for. Sorry but photobucket charged their ransom for our pictures so they aren’t available

Ld 340 flow bench test results
Click to expand...
Interesting , have a question since i'm taking my 360 stroker apart over the next few weeks , what should i do with the Victor 340 intake ? i didn't touch it when bought , just slapped it on the engine , now that it's apart i want to know what you suggest I do with it . the heads flow a bit under 315 cfm , or should i just leave the intake as is ?
thanks
 
Nat said:
Interesting , have a question since i'm taking my 360 stroker apart over the next few weeks , what should i do with the Victor 340 intake ? i didn't touch it when bought , just slapped it on the engine , now that it's apart i want to know what you suggest I do with it . the heads flow a bit under 315 cfm , or should i just leave the intake as is ?
thanks
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If you gasket match it and radius it in 1.5-2 inches up into the runner, radius the plenum, and round off the dividers (think airplane) you would probably get at least 80-85% of the flow I would get out of it. And save yourself 250-300 dollars I would charge. Air loves radius’s.
 
pittsburghracer said:
If you gasket match it and radius it in 1.5-2 inches up into the runner, radius the plenum, and round off the dividers (think airplane) you would probably get at least 80-85% of the flow I would get out of it. And save yourself 250-300 dollars I would charge. Air loves radius’s.
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Thanks . i'll see what i can do
 
Thanks man. Good stuff here. Now we know why the LD340 ran so hard. It was pretty dang good for what it was.....it still is.
 
Nat said:
Interesting , have a question since i'm taking my 360 stroker apart over the next few weeks , what should i do with the Victor 340 intake ? i didn't touch it when bought , just slapped it on the engine , now that it's apart i want to know what you suggest I do with it . the heads flow a bit under 315 cfm , or should i just leave the intake as is ?
thanks
Click to expand...

Have you checked the port alignment? Mine had a ton of core shift and took a lot of grinding align the ports.
 
My Victor below.

AADF1587-C63A-43E7-B78D-5AD1722AB093.jpeg
0CE2F78C-7BFB-45D8-81D7-31EF28499827.jpeg
6FA94803-B9CA-4C26-B3A3-4E2B80AA382D.jpeg
841286B7-4E78-436D-9C66-32E8BA05EEE9.jpeg
 
I’m going to post something here and I hope it doesn’t confuse more than it helps. When you port heads and an intake it’s good to think not of an intake being an intake, BUT as an extension of the runner. We are asking air to do some crazy things at times. Like making a hard left from the intake into a head runner into possibly a harder left in the head. Learn to study the intake runner as one runner at a time in relationship to each head runner. They aren’t all the same. Sometimes the harder you try to explain something the more you mess with someone’s head so I’ll stop and let you think on that. Grab a head, grab an intake and lay them on a table the way it would be assembled on an engine.
 
pittsburghracer said:
I’m going to post something here and I hope it doesn’t confuse more than it helps. When you port heads and an intake it’s good to think not of an intake being an intake, BUT as an extension of the runner. We are asking air to do some crazy things at times. Like making a hard left from the intake into a head runner into possibly a harder left in the head. Learn to study the intake runner as one runner at a time in relationship to each head runner. They aren’t all the same. Sometimes the harder you try to explain something the more you mess with someone’s head so I’ll stop and let you think on that. Grab a head, grab an intake and lay them on a table the way it would be assembled on an engine.
Click to expand...


THANK YOU. I always say you never want to make air turn a corner. If it has to, you need to radius to be as big as space allows.

From the air cleaner to the end of the collector is ONE system. If you think of them as individual pieces and then put them all together you can actually lose power even though the numbers say it should gain power.
 
Because numbers and calculators aren’t everything or rock solid end all science of what the math says it should be. Now if we can get the general population and some members to remember that.......
 
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