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Old 01-25-2022, 11:37 AM   #1
Tim H
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Default Re: OLD Modified Corvettes

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Originally Posted by Shotgun 61 View Post
Hi Ron,

Thanks for your questions, Jerry ran mostly 277 engines but occasionally went up to a 287. He built his own engines and Batten did his heads. He said he left at 8500 and shifted at 10,500, 11K thru the lights. This was with a Dana 60 and 6.50 gear and Doug Nash 5 speed.

Thanks,
Rex
I've not really heard of the 277ci, was it a combo of 265 and 283 parts ? The 287 was a more popular displacement I believe .With the rather limited availability of components in the 1970's how was a 277 built ? Just curious, thanks.
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Old 01-25-2022, 07:56 PM   #2
Tom Broome
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Default Re: OLD Modified Corvettes

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I've not really heard of the 277ci, was it a combo of 265 and 283 parts ? The 287 was a more popular displacement I believe .With the rather limited availability of components in the 1970's how was a 277 built ? Just curious, thanks.
TLDR This is Modified Eliminator stuff, pretty off the path for Super Stock guys.

The 277 was a 283 block (307 sometimes) bored .030 (3.905) with a 2.900 stroke crankshaft. For a budget build you took a large journal 302 crankshaft and offset ground the rods to shorten the stroke one hundred thousandths. If you put that crank in a 4.030 block that got you 296 cubic inches, also a popular combination.

So, basically it was a destroked 287.

The 283 bore size was the smallest bore that could (barely) accept the 2.05/1.60 valve combination popular in the 23 degree heads of the time. If an engine builder wanted live on the edge, they could take a 350 block and offset sleeve all eight cylinders with chrome-moly sleeves and have greater clearance between the intake valve and cylinder wall. You might even then put a larger intake valve in the head. If that allowed the port to flow more air, you might find some power. They might even go to the trouble to make a deck plate to accurately locate the bores off the head dowel locations.

I wouldn't know anyone who would go through that much trouble....Would I?

Last edited by Tom Broome; 01-25-2022 at 08:00 PM.
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Old 01-25-2022, 09:23 PM   #3
Shotgun 61
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Default Re: OLD Modified Corvettes

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TLDR

So, basically it was a destroked 287.

The 283 bore size was the smallest bore that could (barely) accept the 2.05/1.60 valve combination popular in the 23 degree heads of the time. If an engine builder wanted live on the edge, they could take a 350 block and offset sleeve all eight cylinders with chrome-moly sleeves and have greater clearance between the intake valve and cylinder wall. You might even then put a larger intake valve in the head. If that allowed the port to flow more air, you might find some power. They might even go to the trouble to make a deck plate to accurately locate the bores off the head dowel locations.

I wouldn't know anyone who would go through that much trouble....Would I?
I know somebody who did EXACTLY that......................and his name is Jerry Ault. A LOT of work. Jerry was a magician when it came to engine building. I actually found one of his old race engines last year and I "plan" to put it in the car this winter along with a Doug Nash 5 speed, but my back surgeon may have something to say about that.
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Old 01-26-2022, 02:58 PM   #4
lynn engels
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Wink Re: OLD Modified Corvettes

i will come help if you let me sit in the car
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Old 01-26-2022, 05:29 PM   #5
RonP
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Smile Re: OLD Modified Corvettes

Hi Rick Brown,
I hope all is well!
I remember a few years ago, your one crewman had a book that showed several Corvettes that raced in Modified in the 1970's. Do you happen to have the title to that book?

This was at Norwalk, I'm guessing between 2014-2018 when he had the large hardbound book about Corvettes with him. Unfortunately, I did not write down the title in the notepad I normally keep with me at the track.

See you at Norwalk and stay safe!!
Thanks, Ron
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Old 01-26-2022, 06:45 PM   #6
Greg Gay
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Default Re: OLD Modified Corvettes

Rex,

Fantastic car. I remember reading all about it. The two best periods/classes in drag racing were early '70's Pro Stock and late '70's Modified Eliminator. A few questions: The all black version appears to have different rear wheel openings. Is that correct? Did they run the injection or the carbs first? Did they run F/G with the 277, and just add weight to make H/G, or did the run a bigger engine in F?

Thanks for sharing the pictures.

Greg
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Old 01-27-2022, 04:37 PM   #7
Shotgun 61
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Default Re: OLD Modified Corvettes

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Rex,

Fantastic car. I remember reading all about it. The two best periods/classes in drag racing were early '70's Pro Stock and late '70's Modified Eliminator. A few questions: The all black version appears to have different rear wheel openings. Is that correct? Did they run the injection or the carbs first? Did they run F/G with the 277, and just add weight to make H/G, or did the run a bigger engine in F?

Thanks for sharing the pictures.

Greg

Hi Greg and thanks for the kind words. I'll answer what I can. Early on the rear fenders were rounded slightly to accommodate the slicks. Once they installed the narrowed Dana 60, the fenders were repaired and have had the stock appearance ever since. Jerry has always run Crower injection with the exception of one time he was persuaded by another famous racer to switch to carbs. The car slowed down and he switched back to injection. He knew how to make the injection run. He started in F/G and I think due to some NHRA changes he went to H/G, but I don't know all the details.

Thanks,
Rex
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Old 01-27-2022, 09:31 AM   #8
Tom Broome
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Default Re: OLD Modified Corvettes

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I know somebody who did EXACTLY that......................and his name is Jerry Ault. A LOT of work.
And...If...Those eight sleeves happen to get installed just a wee bit offset away from the crankshaft centerline that there might be some ET to be found.
Again, I'm not sayin' I know anybody that's gone to the time and extremes to do that. But I might.
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Old 01-27-2022, 03:24 PM   #9
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Default Re: OLD Modified Corvettes

Anyone know what the sleeve offset was? I’m guessing about .090.
Terry
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