Sbc development - Chevelle Tech
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post #1 of 41 (permalink) Old Feb 2nd, 20, 4:13 AM Thread Starter
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Sbc development

HI
Is anybody aware of any companies doing further development to sbc engine parts .??? Or is that it !! Is it all about economics and how the Evil Twin THE LS motor reigning supreme.

The humble sbc seems to have been reduced to street motor duties .

Are we left with
AFR 23 deg 220cc comp heads
SHP 400 block
programmable ignition
Roller cam

Optional
Premium EFI with spark control $$$
18 deg heads $$$
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post #2 of 41 (permalink) Old Feb 2nd, 20, 8:31 AM
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https://m.youtube.com/watch?v=gUYzannB8jM&t=609s

All steel 265 runs 11.26
https://m.youtube.com/watch?v=hBmhVCaCoxk

“The humble sbc seems to have been reduced to street motor duties “.

Not sure I understand , “Humble” ? Easy 550 HP street motors out of only 400 CID and 200 # lighter than BBC’s ?

With these #’s, I don’t mind being second place to LS motors, if I am. Besides, LS is just the next small block. 😁
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post #3 of 41 (permalink) Old Feb 2nd, 20, 12:03 PM
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Dennis
 
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Re: Sbc development

I agree, the LS is the new small block. But that doesn’t mean the demise of the original sbc.
Upgrades will continue. The OP even lists some recent things that have improved sbc, and bbc engines in the last few years.
I like LS motors for their efficiency, both power and economy-wise.
But I love traditional SB and BB engines for their lack of complexity.

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post #4 of 41 (permalink) Old Feb 2nd, 20, 1:58 PM
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Reminds me of,

“When are they coming out with a new and improved Cathleen Turner ?”

😁
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post #5 of 41 (permalink) Old Feb 2nd, 20, 6:07 PM
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Re: Sbc development

I have a 9.7 comp 358 SBC that runs 11.40'[email protected] with iron heads. Would cost me minimum of 2K to do this with an LS based engine with buying a new intake, headers and ign firing box.
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post #6 of 41 (permalink) Old Feb 2nd, 20, 6:36 PM
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Quote:
Originally Posted by 68Chevele View Post
I have a 9.7 comp 358 SBC that runs 11.40'[email protected] with iron heads. Would cost me minimum of 2K to do this with an LS based engine with buying a new intake, headers and ign firing box.
👍. That’s screaming. And someone was just bragging running 11.60’s with 96 more CID !
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post #7 of 41 (permalink) Old Feb 2nd, 20, 8:03 PM
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Re: Sbc development

Modern stuff you got to get it to the pavement.
SO many LS and Ford supercharged and Turbo stuff that launches horribly and on the street just sit and spin.
It is easy to make HP.. hook it up and make it live.
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post #8 of 41 (permalink) Old Feb 2nd, 20, 9:01 PM
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Quote:
Originally Posted by jeff swisher View Post
Modern stuff you got to get it to the pavement.
SO many LS and Ford supercharged and Turbo stuff that launches horribly and on the street just sit and spin.
It is easy to make HP.. hook it up and make it live.
As performance continues to dumb down expect to see more “sit and spin” events weather it is a burnout contest or drifting with more turbo, blower or bottle.
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post #9 of 41 (permalink) Old Feb 3rd, 20, 1:13 AM Thread Starter
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Re: Sbc development

Hi
Video engine uses super narrow rings . Max Hp was 557. A little over stated considering compression and cam . The rings might make a lot of difference but I doubt it.
Comparison engines would suggest 10-30 less
400 dart complete engine HR 242/248 530-540 hp
400dart Afr SR 248-254 550hp 11;1 CR
GM 395 AFR HR 236--242 approx. 520HP 10:1 CR
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post #10 of 41 (permalink) Old Feb 3rd, 20, 9:46 AM
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I always considered 10.5 minimum compression for any sort of performance motor. Even a 283/283 57 Chevy had 10 or 10.5.

Thin rings are actually old school now. LS been running them for years. In fact, some say thin rings is what gives LS HP advantage.

It is common for street SBC’s to produce 1.25-1.37 HP per. Prominent engine builder closely associated with South East Gassers says 1.50 no big deal, 1.5 up is serious and 2.0 per is impressive.

I mention this only to point out SBC’s built by the Keith Dorton class of engine builders produce plenty of HP w/just “engine building 101”. 😁
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post #11 of 41 (permalink) Old Feb 3rd, 20, 11:43 AM
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Re: Sbc development

Here is a read on thin vs thick rings.
https://www.hotrod.com/articles/dyno...th-horsepower/

My daily driver 350" has 10.87 compression and never any issues..I have had 11.9 compression in one 350 and it was an excellent engine.
In fact it is the same one with 10.87 now in a different vehicle different heads.
I have not checked cranking pressure with the current 280H cam but the old 268H I ran for a couple years was 225 PSI and the 11.9 deal was 245 PSI with a 270H cam.

Many things must happen when you try to run those compression ratios on 91 octane.
Nothing wrong with old school SBC it will spank many new LS and Coyote deals if done right.

2015 supercharged tweaked Mustang 6 speed 373 gears 550 wheel HP vs 1957 4 door chevy with 280H flat tappet cam and 601 heads 1.84-1.50 valves TH 350 4.56 gears. (My timing retarded on me in the burnout to 28 total) Runs best at 38. hurt my top end pull. It was still a win for the old school 350" from 1969 station wagon.


Would not take much to make that 57 Fast.
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post #12 of 41 (permalink) Old Feb 3rd, 20, 11:48 AM
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^^^^^. Hahaha,
Hell of a hole shot 😁. Or were you spotted 2 lights ?
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post #13 of 41 (permalink) Old Feb 3rd, 20, 11:54 AM
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Re: Sbc development

No he was making peanut butter and jelly sandwich i suppose.
I have raced him in my 47 dodge in the 1/8 and beat him.
People like to sleep at the light and can't launch on top of that.
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post #14 of 41 (permalink) Old Feb 3rd, 20, 11:58 AM
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Quote:
Originally Posted by jeff swisher View Post
No he was making peanut butter and jelly sandwich i suppose.
I have raced him in my 47 dodge in the 1/8 and beat him.
People like to sleep at the light and can't launch on top of that.
👍 Made my day !

Maybe your competitor needs some more Roush, Cobra, Snake, Shelby decals, or maybe just some No Doz 😁

BTW, good read on thin rings.
Those holes in modern piston ring lands ? First done by Bill Jenkins !
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post #15 of 41 (permalink) Old Feb 7th, 20, 7:05 PM
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Rumors of SBC’s death are greatly exaggerated !

https://www.rodauthority.com/news/af...take-manifold/
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