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Old 03-04-19, 08:46PM   #1
Zedo
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Default 7.4 liter LS GM V8 for 2020

that's what I was told today. 452 cubic inches, 7.4 liter. will be equipped with the LS7 427 Vette big rectangular port heads.

digging around for some info, those are one big mutha heads. nearly as big intake port volume as a Pontiac Ram Air V, and the LS7 heads flow over 320 CFM out of the box.

it's 1970 all over again. the 7.4 liter is going to be a Siamese bore block design like the old 400 small block was, but on the new LS engine block, with the 6 bolt mains.

even their "small" cathedral port heads have 200 cc intake port volume. what I was saying all along for over a decade here, without the port volume you got nuthin'

one thing about LS engines, other than the 7 liter Vette motor, they were and are small engines. the 6 liter is only 366 CID, and the 6.2 liter is only 376 CID. when I heard they made 400 HP and 400 ft. lb. torque, I was like huh what's the big deal ? a Pontiac 455 made that in 1970 with a carburetor, and 500 ft lb torque. now they are getting with the program. there's no substitute for cubes.
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Old 03-05-19, 01:19AM   #2
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No substitute for Cubic inches thatís for sure.
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Old 03-05-19, 09:07PM   #3
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Modern engines are much better in every way
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Old 03-05-19, 10:59PM   #4
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LS 3 powered Volkswagen van I raced against on Friday night was impressive.

What are the rod lengths & strokes on the smaller LS engines and on the 7.4?
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Old 03-07-19, 09:16AM   #5
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LSX 454 crate motor, 6 bolt mains, etc.
it's 1970 all over again

https://www.chevrolet.com/performanc...ngines/lsx-454
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Old 03-08-19, 01:46AM   #6
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Looks pretty stout.
I like the fact they went with the deep skirt block and registered /side bolted mains.
Pontiac OHC 6 has deep skirt block/registered mains as do the old Datsun/Nissan 4&6 cyl L series OHC engines (not cross bolted though).
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Old 03-16-19, 02:23AM   #7
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A Guy I ran into at the track on March 1st I had not seen in over 12 years .
He did a different take on Modern Muscle.
He is running a 68 Barracuda that he has re-fitted with the complete Hellcat drive train that he obtained from a wrecking yard. The car is using all the features from the donor car including the ECM with the built in security system.
At first glance walking by the car you would say " oh that's a cool old Barracuda" and he just smiles and nods "yes". The hood stays down in staging.The car has the patina of a survivor car that is being competed but that's where the resemblance ends.
The guys with the brand new stuff think he's a duck until they line up against him and the hammer gets dropped. Gone like a cool breeze.
They have a hard time accepting that they just got shut down by an "old 'Cuda". LOL
Total resto-mod of old muscle cars has really caught on.
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