Serious 340 build into 361 HiRPM Screamer

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Moparpuller said:
It all depends on the situation. We truck pull which is basically a drag race with 35.000 pounds behind you. We run the engine to 85-8600 that way when the pan hits it falls into the power at about 7500rpm
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I certainly don't argue there are engines that are designed to, and do rev that high. My point is, it is not what the masses are doing. I think there are some street warriors that like to take the tach to places it likely shouldn't be, then tell the world this is normal and how it should be.
 
cpearce said:
I certainly don't argue there are engines that are designed to, and do rev that high. My point is, it is not what the masses are doing. I think there are some street warriors that like to take the tach to places it likely shouldn't be, then tell the world this is normal and how it should be.
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Truth
 
Moparpuller said:
It all depends on the situation. We truck pull which is basically a drag race with 35.000 pounds behind you. We run the engine to 85-8600 that way when the pan hits it falls into the power at about 7500rpm
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I’d love to hear a sound clip of that. Any videos?
 
RAMM said:
Totally agree-A stable, happy and RELIABLE valvetrain @ 7000+ is not all that common or easy. Most 340's I've tested are pretty much done @ 5900-6000--Will they rev to 7000 rpm if asked to--Yes most of the time. Will they actually keep you pinned in the seat all the way to 7000-7500? Not in my experience they won't. Thanks for the comments. J.Rob
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agree 100% my 340's maxed out at 6200- 6300 rpm they would rev up to 7500 when I forgot to shift but it made no power up there .
Can't wait to see the results of your build . Good luck
 
My .02 is.......

If you’re building a 340 to be a bit of a revver........ and it doesn’t peak somewhere near 7k....... you didn’t try very hard.

264C3637-730F-4EE8-B0B1-D040C54C4478.jpeg
 
cpearce said:
I certainly don't argue there are engines that are designed to, and do rev that high. My point is, it is not what the masses are doing. I think there are some street warriors that like to take the tach to places it likely shouldn't be, then tell the world this is normal and how it should be.
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Like our buddy AJ…….. LMAO….

Don’t forget the 36+ mpg he gets…..
 
rumblefish360 said:
Like our buddy AJ…….. LMAO….

Don’t forget the 36+ mpg he gets…..
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36 mpg , wow ! best i ever did was 22- 24 mpg with a GV overdrive and 3:55 gears might have gotten better with 3:23 gears , but no where near 36 without a tailwind and a big sail
 
Hemirunner said:
At that mph and weight, it’s roughly 1200hp to the tire. That pass was NA at the hit but it’s a turbo street car. We’re ramping in 10psi by 1.4 seconds hence the lazy 60. Engine is a 540 Hemi, 9.5cr, 258/265@050
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Full interior full cage I’m guessing? All steel? 4000 is a lot to move that quickly. What fuel?
 
mderoy340 said:
Do you remember what cam was in it?
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It was a Crower SFT.

I don’t recall the specs exactly(built it close to 30 years ago), but something like 263/265-108, .575/.585.

It was in the catalog on a 105 or 106, and I had them do it on the 108.
 
PRH said:
It was a Crower SFT.

I don’t recall the specs exactly(built it close to 30 years ago), but something like 263/265-108, .575/.585.

It was in the catalog on a 105 or 106, and I had them do it on the 108.
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What heads are these? I assume a larger port volume than stock?
 
PRH said:
It was a Crower SFT.

I don’t recall the specs exactly(built it close to 30 years ago), but something like 263/265-108, .575/.585.

It was in the catalog on a 105 or 106, and I had them do it on the 108.
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How much head work? Also what intake and headers? Oh yeah, how much compression?
 
Back in the late 70's and early 80's Cam Dynamics 16002 and a 16202 was my go to for customers cars.It was 275@50 585 lift on a 106 good for 7500 rpm, that was the last stop before a Roller cam
 
To answer the Q’s on my 340......

-Gasket matched Victor with some mild plenum clean up
-11:1CR
-587 heads with basic full porting. Flowed 260 with 3/8” stem stock replacement 2.02/1.60 tulip valves
-Custom Ross flat tops with .927” pins.
-reworked unbushed 360 rods, that had the beams polished and were fitted with ARP bolts and bushed to .927”.
-1-3/4” Hooker headers

There were way fewer options for off the shelf trick parts for a SBM in 1991.
 
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