Ld 340 flow bench test results

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A good Friend of mine asked me if I would check his LD 340 on my flow bench today and I myself was a little curious so I mounted a small block edelbrock to the bench and did a flow test on the head. We then bolted his some what grubby looking intake to the head. This was a used intake that was never touched with a grinder so it was not even gasket matched. Here are the flow numbers.

head head with intake
100 60 62
200 137 130
300 200 187

400 251 224
450 256 239
500 267 247
550 273 249
600 275 254
650 276 255
700 276 255

I always knew that these were good intakes and after doing this test it backs up what we have seen at the track for years. He wants to see the results from Matt's Victor 340 intake and if they are close we will do some gasket matching and touch up work to the LD340. Here are a couple of pictures of his intake so you can see how much better it could be with some work.

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Just a little update on the LD340. It peters out early and hard. I am finishing up a set his set of open chamber Edelbrocks (2.08 valve) and we didn't push as hard as we could have as he is only going to ran a 520 racer brown cam (1.6 rocker app 550). I wanted him to go with a Victor 340 but he wanted to see what the LD340 would do so I gasket matched it, a little plenum work, and a matched 4150-4500 carb adapter. There is not alot you can do in the runners as you can't even see them. Here are some new numbers.

with out intake-----with intake
.200---137-----------134
.300---198-----------193
.400---245-----------241
.450---268-----------250
.500---279-----------263
.550---289-----------272
.600---290-----------272
.650---292-----------271
.700---302-----------271

I have him talked into trying a Victor.

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Vic,

Have you ever tested a Victor 340 on a 300-ish @.600 flowing head? Just curious.

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Vic,

Have you ever tested a Victor 340 on a 300-ish @.600 flowing head? Just curious.

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A good Friend of mine asked me if I would check his LD 340 on my flow bench today and I myself was a little curious so I mounted a small block edelbrock to the bench and did a flow test on the head. We then bolted his some what grubby looking intake to the head. This was a used intake that was never touched with a grinder so it was not even gasket matched. Here are the flow numbers.

head head with intake
100 60 62
200 137 130
300 200 187

400 251 224
450 256 239
500 267 247
550 273 249
600 275 254
650 276 255
700 276 255

I always knew that these were good intakes and after doing this test it backs up what we have seen at the track for years. He wants to see the results from Matt's Victor 340 intake and if they are close we will do some gasket matching and touch up work to the LD340. Here are a couple of pictures of his intake so you can see how much better it could be with some work.

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What work had been done to the heads at this point ? Be interesting to see how an OOTB RPM or AirGap compares to the LD340. Thanks for sharing.

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No worries, it's all good!

I should have said "Has ANYBODY....but I know Vic (to name just one) is very experienced with finding potential in that Manifold.

I think a ported Victor should flow well in excess of 300cfm on an ~ equally flowing head, the runners are generous and fairly short which is usually advantageous on long stroke combos or short strokers at High RPM. The only thing it seems to want for is a bit more plenum volume.

I've ported several of them over the years, As cast the runner transitions from the plenum need a fair amount of work but they come around great after 'whittling', I actually opened it up a bit more than with my SDSS Stage 2's. My new heads flow ~310 even with my little 'broomstick' roller, I still think the old Vic 340 will be better overall than the SV in terms of peak power (though maybe not necessarily
for peak midrange torque).

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Its really a shame how bad some of this stuff is out of the box.

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