Fast L78 - Chevelle Tech
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post #1 of 154 (permalink) Old Mar 15th, 20, 3:27 PM Thread Starter
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Ken
 
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Fast L78

Hi,

Does anyone have a fast L78? I'm thinking mid to low 12s. What is your combo? If you are running a carb spacer and you have proven it made a difference,how thick is it? What specs are you running in your distributer?

Big thanks


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post #2 of 154 (permalink) Old Mar 15th, 20, 3:38 PM
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post #3 of 154 (permalink) Old Mar 15th, 20, 6:14 PM
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Re: Fast L78

Did they run low 12s stock no
Id get rid of those rectangle ports and change cams to get there.
Wrong heads and a lazy design cam

Bet you can dip into the 11s wiht those 2 changes + headers

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post #4 of 154 (permalink) Old Mar 15th, 20, 6:26 PM
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I’ll take the heads !
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post #5 of 154 (permalink) Old Mar 15th, 20, 6:38 PM Thread Starter
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Ken
 
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Re: Fast L78


Thanks for the info.


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post #6 of 154 (permalink) Old Mar 15th, 20, 7:04 PM
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Re: Fast L78

Quote:
Originally Posted by 396375 View Post
Hi,

Does anyone have a fast L78? I'm thinking mid to low 12s. What is your combo? If you are running a carb spacer and you have proven it made a difference,how thick is it? What specs are you running in your distributer?

Big thanks
Yes, people do....https://youtu.be/OYC8XpG4meA




https://youtu.be/EyksWlC-HFo
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Machined GM production heads
Oil pan modifications
Red Line Camshaft
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post #7 of 154 (permalink) Old Mar 15th, 20, 7:28 PM
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Re: Fast L78

Quote:
Originally Posted by 396375 View Post
Hi,

Does anyone have a fast L78? I'm thinking mid to low 12s. What is your combo? If you are running a carb spacer and you have proven it made a difference,how thick is it? What specs are you running in your distributer?

Big thanks
It might depend on whether the L78 is stock or slightly modified. Mine is equipped with a Howards cam and 1.72 Comp Cams Magnum rockers. Duration and lob separation are stock but cam/rocker combination adds another .025 valve lift. I also am running 1.88 exhaust valves, 800 Holley DP, (with spacer) headers, no smog pump and an MSD Pro Billet distributor with 12* static/37* total timing at 2,700. Engine was precision machined, balanced, honed with torque plates with all clearances blueprinted. SO...not actually stock...but not that far away either. That said, I've yet to run it at the track but might do so this season, just to find out what it will do with street radials, tailpipes, M22 and 3.73 rear gears. I'm betting mid-high 12's with the 3.73's and low-mid 12's with the 4.10 rear I've yet to build up. With Drag Radials and open exhaust perhaps 12.0.

I realize there are better cams and perhaps oval port heads would work better. But I built it how I wanted and it is an original L78 car so I didn't want to deviate too much from what GM offered in '69.
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1969 Chevelle SS396, L78, M22, KK 4.10 posi, F41, Blue Light Stereo, Tilt Column, Burgundy/Maroon w/Red Stripe, Black Bench Seat, PS,
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post #8 of 154 (permalink) Old Mar 15th, 20, 8:02 PM
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Re: Fast L78

30 years ago at my local track (Kil-Kare in Xenia Ohio) there was a guy who would occasionally show up with a slightly weathered survivor `69 L78 Nova. It was an automatic car with 4.10 gears. The only mods were headers & a good exhaust and a set of L60 street tires that hooked "OK". On a good pass feathering it off the line the car ran 12.60's-12.70's and attracted quite a bit of attention back then.

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post #9 of 154 (permalink) Old Mar 15th, 20, 8:20 PM
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NHRA legal SS/D (no bracket racer, all right foot)
396/375 ran 11.17.....with rectangular port heads. !

Some here might recognize this car. !
https://www.youtube.com/watch?v=Ai3cnc-77ZE
Watch this launch, little wheel spin, no wheels in the air drama !

540 HP 396, cam change, intake change, open headers and blueprint.
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post #10 of 154 (permalink) Old Mar 15th, 20, 8:46 PM
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Re: Fast L78

Quote:
Originally Posted by 396375 View Post
Hi,

Does anyone have a fast L78? I'm thinking mid to low 12s. What is your combo? If you are running a carb spacer and you have proven it made a difference,how thick is it? What specs are you running in your distributer?

Big thanks
This guy. Tim Clary. Pure Stocker. 396/375 ~ 12's, on F70 repo street tires. That fast enough?

facebook.com/psmcdr/photos/tim-clary-1969-chevrolet-chevelle-ss-396-best-run-12.131-at-116.42 mph

Jon N.

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post #11 of 154 (permalink) Old Mar 15th, 20, 8:51 PM
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^^^^^^ hahaha, so much for the mighty lightweight hemi beep-beep

Almost broke in 11’s

396/375 has always been an over achiever. !
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post #12 of 154 (permalink) Old Mar 15th, 20, 9:24 PM
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Re: Fast L78

I had a friend whose Dad owned a 69 Chevelle 396-375 with chambered exhaust , 4 speed and 4:11 gears.

It felt like a 14 second car. That's all I have to say.

Color me a skeptic of those race cars being close to factory specs.

67 Chevelle convertible, 138 vin, original 4 speed, bucket seats, Marina Blue with black interior
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post #13 of 154 (permalink) Old Mar 15th, 20, 9:33 PM
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My friend had a nice 375hp 4spd 67 velle.
Ran 12.70 with j60 m&h racemasters thru mufflers and manifolds.
All stock rebuilt engine.

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post #14 of 154 (permalink) Old Mar 15th, 20, 9:42 PM
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Re: Fast L78

Vintage Road Test: How Tough Was the 1966 Chevrolet Chevelle SS396?


"Of all the things the SS396 should be, it is competitive at the drags," he wrote. He put the car on the track without the magazine's typical strip tune-up, save for a tweak to the Holley four-barrelódisassembly of the vacuum diaphragm housingóto get the secondaries to open sooner.

The day was cool and the car faced a 30-mph headwind. The Uniroyal Tiger Paws didn't get much bite, and the car initially ran 16.30 at 86 mph. "Since traction seemed the major problem, we thought a few of the match racer tricks might be of some help," he said. "So the tires were burned through puddles of bleach for super cleaning, and some liquid traction compound painted on. This done, the machine recorded a better 15.70 e.t. at 92 mph. We realized that without the benefit of adequate dragging skins and a proper collector system, you can't expect miracles, but the wind and cold track had something to do with it, too."

The "without adequate dragging skins" comment is interesting because we found an outtake (seen here) of the Chevelle's trunk full of the aforementioned bleach, traction compound, and a pair of Casler slicks. Maybe they didn't fit. Maybe Dahlquist ran out of time. Not sure.

But he also noted that at the track that day was "a '65 Chevelle SS with 375 hp, NASCAR Holley, slicks, and who knows what else, that wasn't going more than a second quicker." So conditions were definitely an issue.

He summed up the Chevelle by calling it "the type of vehicle we hated to part with. It has just the right measures of ride-handling and acceleration that would make it the nuts for all kinds of driving, especially long trips. It's a fun car for today's dull traffic, and if it helps relieve the tedium of travel, you can't ask much more."

https://www.hotrod.com/articles/vint...hevelle-ss396/

67 Chevelle convertible, 138 vin, original 4 speed, bucket seats, Marina Blue with black interior
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post #15 of 154 (permalink) Old Mar 15th, 20, 10:03 PM
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Quote:
Originally Posted by nashville beth View Post
Vintage Road Test: How Tough Was the 1966 Chevrolet Chevelle SS396?


"Of all the things the SS396 should be, it is competitive at the drags," he wrote. He put the car on the track without the magazine's typical strip tune-up, save for a tweak to the Holley four-barrel—disassembly of the vacuum diaphragm housing—to get the secondaries to open sooner.

The day was cool and the car faced a 30-mph headwind. The Uniroyal Tiger Paws didn't get much bite, and the car initially ran 16.30 at 86 mph. "Since traction seemed the major problem, we thought a few of the match racer tricks might be of some help," he said. "So the tires were burned through puddles of bleach for super cleaning, and some liquid traction compound painted on. This done, the machine recorded a better 15.70 e.t. at 92 mph. We realized that without the benefit of adequate dragging skins and a proper collector system, you can't expect miracles, but the wind and cold track had something to do with it, too."

The "without adequate dragging skins" comment is interesting because we found an outtake (seen here) of the Chevelle's trunk full of the aforementioned bleach, traction compound, and a pair of Casler slicks. Maybe they didn't fit. Maybe Dahlquist ran out of time. Not sure.

But he also noted that at the track that day was "a '65 Chevelle SS with 375 hp, NASCAR Holley, slicks, and who knows what else, that wasn't going more than a second quicker." So conditions were definitely an issue.

He summed up the Chevelle by calling it "the type of vehicle we hated to part with. It has just the right measures of ride-handling and acceleration that would make it the nuts for all kinds of driving, especially long trips. It's a fun car for today's dull traffic, and if it helps relieve the tedium of travel, you can't ask much more."

https://www.hotrod.com/articles/vint...hevelle-ss396/

^^^^^^. Hahaha

Real deal, 396/375 with headers out horsepowered 454 LS6

https://m.youtube.com/watch?v=CFopXN2KrPc
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