I have actually heard old timers say you don't want good exhaust flow with a hemi head. I never really believed it and I think this proves they are like every other engine. Headers make power
I saw that Holly makes a single plane intake for the 3rd or 4th gen hemi. I'd also like to see the Edelbrock Victor heads on the hemi to see the flow numbers.
Really needed that big cam test with the shorty headers vs longtube headers. Using the log style on any type of build wasn’t going to produce anything. Also needed the shorty headers vs stock srt manifolds on n/a car. The primary sizes are different that’s atleast two combos that we coulda seen instead of stock logs vs longtubes
Chrysler is going to be SO SCREWED if they stop making Hemis. Can you do a video comparing similar LS/LT and Hemi engines if similar mods are done to them?
Can you test the 392 Jeep Grand Cherokee log style headers, you can buy a kit from mopar for swaps and the kit is around $350ish. The kit has manifolds, gaskets, bolts. 100% worth the money for a tight fitting swap. Way different from the ram log styles.
Maybe we can have go fund me's for different tests? Poor Richard can't fund it all alone. I'd love to see 392 tests ❤️. I have a 14 jeep srt. 👍 want to rear mount turbo it.
I know they flow good, just want to know how good. The exit on them is almost 3.5 inches. I used them on my 5.7 swap. They don’t have the real bad crappy manifold sound either. Very good for a tight fit.
Richard, thank you for all the great videos you keep putting out, I really do appreciate them. Unfortunately, I never have the opportunity to join your live streams so I would like to see if I can ask you a question to see your thoughts on this combination for street use. 4.8L in a Chevy Silverado, BTR truck Norris cam, springs, and rods, GT45 turbo and of course a inner cooler. Everything else on the motor is stock. If you would tweak something out of that I’m open to recommendations. Thanks again for your videos and your time.
Not true. Internals are as strong or stronger than an LS depending on which Hemi you have. Tight ring gaps on the factory N/A stuff and the lack of people who know how to tune them is the reason people who have never built one believe that BS.
could you test EGT changes with the more efficient headers, so you had some blow thru at lower speeds, maybe a wider lca to cut overlap Hemi is very sensitive to overlap, much more so than a SBC or even a BBC/ Cleveland style head, Running one of the modeling programs would show
You're last live was about intercooler I was wondering what would happen if you have 2 intercooler a front mount and a intercooler brick on a ls platform intake manifold
You would have a good low intake charge but may suffer some psi drop across two intercoolers. But the other way to go when running a brick style intercooler is running an external heat exchanger in series to the brick intercooler. Is it redundent yeah but will run way cooler intake temps how much dunno maybe rich will test it one day
If you have two intercoolers that flow well, you would have more cooling with minimal pressure drop. The second cooler would not lower the temp (in total numbers) as much as the first, but would lower it
@@richardholdener1727 Never thought about mixing a ata intercoolwer with a atw and a heat exchanger. Not really a ideal set up but would be neat to see how it works out. Also the 5.3 nitro experiment was cool . Base line 93 octane made 235 to the wheels, on a 60% nitro meth mix made 488 hp at 5500 rpm 39* of timing fun project lol
@@RC-po3tvit’s an LT for sure, at least from factory. You can tell because it’ll have direct inject injection, among many other differences. Just google pictures of an LS 5.3 and an LT 5.3
Keep the hemi tests coming please🙏 ❤
don't get used to it. no more hemis from stellantis. dodge is dead.
Yeah, the shorty vs. long tube graph is missing. Otherwise, good content! Keep it up... You almost got me doing a junkyard ls swap...
He’s shown numerous other engine families that shorties are rarely more than a few hp better than stock manifolds.
At 5:36 you talking about a graph and it says here but short graph not displayed
Impressive flat torque curve on almost all of those tests, what a beast.
I have actually heard old timers say you don't want good exhaust flow with a hemi head. I never really believed it and I think this proves they are like every other engine. Headers make power
I hear the same nonsense with blower and turbo applications. "You're gonna let all the boost out!" Bahahaha
love the hemi tests. very cool engines. mine has 220k miles with no issues
The rave music lives rent free in my head.
Dear Richard,
I just want to say, You are making hell of a good job!
Thanks for the hemi stuff!! In a world of LS only stuff this is cool
I saw that Holly makes a single plane intake for the 3rd or 4th gen hemi. I'd also like to see the Edelbrock Victor heads on the hemi to see the flow numbers.
Really needed that big cam test with the shorty headers vs longtube headers. Using the log style on any type of build wasn’t going to produce anything. Also needed the shorty headers vs stock srt manifolds on n/a car. The primary sizes are different that’s atleast two combos that we coulda seen instead of stock logs vs longtubes
Love the gen 3 hemi tests!
That hemi has a pretty awesome looking torque curve flat out from 3000 too 7000
Chrysler is going to be SO SCREWED if they stop making Hemis.
Can you do a video comparing similar LS/LT and Hemi engines if similar mods are done to them?
Video editing messed up during the shorty discussion if you want to fix it. Audio was fine though. Thanks for the tests!
Can you test the 392 Jeep Grand Cherokee log style headers, you can buy a kit from mopar for swaps and the kit is around $350ish. The kit has manifolds, gaskets, bolts. 100% worth the money for a tight fitting swap. Way different from the ram log styles.
Maybe we can have go fund me's for different tests? Poor Richard can't fund it all alone. I'd love to see 392 tests ❤️. I have a 14 jeep srt. 👍 want to rear mount turbo it.
I know they flow good, just want to know how good. The exit on them is almost 3.5 inches. I used them on my 5.7 swap. They don’t have the real bad crappy manifold sound either. Very good for a tight fit.
I really want to see a 392 with a dual plane intake... Imagine the torque on that beast!
Just think how much more tq the long tubes would have made with a cam with proper LSA like 108.
I can’t wait to see a twin turbo 5.7.
I have turbo hemi stuff up
@5:30 the dyno graph did not come up. But great testing and info
It keeps looking like long tubes are more about keeping the 90deg and 180deg blowdown interference from having a negative effect at a much lower rpm
The graph for the test just before the supercharged engine is missing. Oops...
Richard, thank you for all the great videos you keep putting out, I really do appreciate them. Unfortunately, I never have the opportunity to join your live streams so I would like to see if I can ask you a question to see your thoughts on this combination for street use. 4.8L in a Chevy Silverado, BTR truck Norris cam, springs, and rods, GT45 turbo and of course a inner cooler. Everything else on the motor is stock. If you would tweak something out of that I’m open to recommendations. Thanks again for your videos and your time.
converter
This is fantastic information as always.
To bad Dodge puts such whimpy internals in these hemi's.
Not true. Internals are as strong or stronger than an LS depending on which Hemi you have. Tight ring gaps on the factory N/A stuff and the lack of people who know how to tune them is the reason people who have never built one believe that BS.
Very good info here. I'm rebuilding a 392 and still questioning whether the few extra hp is worth $2000+ for long tubes
find cheaper headers
could you test EGT changes with the more efficient headers, so you had some blow thru at lower speeds, maybe a wider lca to cut overlap Hemi is very sensitive to overlap, much more so than a SBC or even a BBC/ Cleveland style head, Running one of the modeling programs would show
Wow amazing how people know so much about everything all you tube sensation
30 years of dyno testing
Richard too bad you didn't test aftermarket shorty's on first test do you have any 347 ford header comparison
I have tested shorty Ford heads many times
You're last live was about intercooler I was wondering what would happen if you have 2 intercooler a front mount and a intercooler brick on a ls platform intake manifold
You would have a good low intake charge but may suffer some psi drop across two intercoolers. But the other way to go when running a brick style intercooler is running an external heat exchanger in series to the brick intercooler. Is it redundent yeah but will run way cooler intake temps how much dunno maybe rich will test it one day
If you have two intercoolers that flow well, you would have more cooling with minimal pressure drop. The second cooler would not lower the temp (in total numbers) as much as the first, but would lower it
@@richardholdener1727 Never thought about mixing a ata intercoolwer with a atw and a heat exchanger. Not really a ideal set up but would be neat to see how it works out. Also the 5.3 nitro experiment was cool . Base line 93 octane made 235 to the wheels, on a 60% nitro meth mix made 488 hp at 5500 rpm 39* of timing fun project lol
Have you ever seen a difference with the "equal length" shorty headers?
only tested that on a SBF
I thought short runner intakes make more torque than than long runner intakes but long runners make more power up top
reverse that
@@richardholdener1727 so why does the Holley high ram make more peak power than the low ram?
Have you try the afr hemi heads ??
Where would tri-Y headers fall ?
Beast!!
Hi Richard! What LS has a 2017 SUBURBAN.
Are asking what LS engine is in a 2017 Suburban? Because they use gen 5 LT engines. 5.3L L83, or 6.2L L86 I believe.
@@mr.3phase228 Hi! Yes. I know that it is an 5.3L. I'm not sure if it is an LT or not. How do I know it? But it is supposed to be an gen 5 right?
@@RC-po3tvit’s an LT for sure, at least from factory. You can tell because it’ll have direct inject injection, among many other differences. Just google pictures of an LS 5.3 and an LT 5.3
Mopar or no car 🎉
1 7/8 ftw