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Old May 27, 2018 | 03:09 PM
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Default 68 Engine stamp HP

Bought a 68 Vette with engine number V0424HP. Owner said it was a 350HP. Some sites say its a 350HP others a 300HP .It has air and PS. Which is right?
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Old May 27, 2018 | 03:16 PM
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Originally Posted by Bruce Powelson
Bought a 68 Vette with engine number V0424HP. Owner said it was a 350HP. Some sites say its a 350HP others a 300HP .It has air and PS. Which is right?
Came 300 hp from the factory but could have been built to anything.

Last edited by Dynra Rockets; May 27, 2018 at 03:26 PM.
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Old May 27, 2018 | 03:20 PM
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Engine number matches VIN and West Coast Corvettes confirmed it is numbers matching so I'm pretty sure it is the original engine. I just don't know the correct horsepower.
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Old May 27, 2018 | 03:27 PM
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Originally Posted by Bruce Powelson
Engine number matches VIN and West Coast Corvettes confirmed it is numbers matching so I'm pretty sure it is the original engine. I just don't know the correct horsepower.
My mistake on the '68. My book says 300 hp from the factory
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Old May 27, 2018 | 07:05 PM
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V0424HP codes mean 1968 corvette, built april 24, 1968 and built as a 327 engine 350 horsepower manual trans, A/C PS.
check the casting date on the engine block to further confirm the dates line up.
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Old May 27, 2018 | 07:19 PM
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My book shows;

HP 327/ 300 base engine w/ Rochester Q-jet, ac, ps and manual transmission.

HT 327/ 350 L79 with Rochester Q-jet, special camshaft and four speed.
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Old May 27, 2018 | 08:05 PM
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So where can I get the most reliable answer?I’ve seen both horsepower listings in various web sites and it seems to vary in different books. I haven’t been able to find any history or options using the VIN either.
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Old May 27, 2018 | 08:39 PM
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Check Rowley Corvette.

HP = 300 horsepower
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Old May 27, 2018 | 08:51 PM
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They probably shouldn't have used HP as a broadcast code. A little confusing.
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Old May 27, 2018 | 10:27 PM
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Default Double hump heads

An ex GM employee said the double hump heads would indicate 350 HP.
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Old May 28, 2018 | 03:32 AM
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Originally Posted by Bruce Powelson
An ex GM employee said the double hump heads would indicate 350 HP.
I believe both had the same head castings (300 = smaller valves) except for the very early build cars?? 292's IIRC ?

Other signs to look for:

what is the carb #?

7028207 = 300hp
7028208 = 300hp
7028219 = 350hp

6.75" or 8" crank harmonic balancer?

Last edited by Dynra Rockets; May 28, 2018 at 03:33 AM.
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Old May 28, 2018 | 07:45 AM
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what tach is in it? most people dont bother to change those
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Old May 28, 2018 | 09:10 AM
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100% the HP code is 327-350 HP with AC. I used to own one. The Rowley website is wrong. That engine configuration without AC has the HT code. Carburetor for both is the same, 7028219.

Also, the latest NCRS TIMJG (5th Edition) has the codes listed on page 108. Indicates HT and HP are for the L79 (327-350 hp). 300 hp cars were HO for automatic and HE for 4spd.

Last edited by avalonjohn; May 28, 2018 at 09:18 AM.
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Old May 28, 2018 | 09:39 AM
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corvette black book says HP code is 350HP.
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Old May 28, 2018 | 10:27 AM
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The Black book & the NCRS judging guide are correct!
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Old May 28, 2018 | 11:06 AM
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Thanks everyone. Unbelievable how many sources are wrong on this. Also, with a 6000RPM tach I’m convinced 350HP is right.
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Old May 28, 2018 | 11:21 AM
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Originally Posted by Bruce Powelson
Thanks everyone. Unbelievable how many sources are wrong on this. Also, with a 6000RPM tach I’m convinced 350HP is right.
100% it is.

That is a great combo you have and rare. Not many L79s came with AC. If I recall it was close to a $500 option. As I mentioned, I owned one a few years ago. I bought it from the original owner with the intent to restore. Just decided it was too much for me and sold it. I kick myself in the rear. It was a Silver / Black L79 Coupe with AC. 50k miles. All original down to the carburetor (wow is that one rare) and smog. It was actually bought at the dealership by the original owner the day I was born. POP was hand-dated on the day. Dummy me.

My current 68 is an L79 w/o AC. Owned since 1985.

Love to see pictures if you can post some. Good luck with the car!

Last edited by avalonjohn; May 28, 2018 at 11:25 AM.
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Old May 28, 2018 | 11:32 AM
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In 68 How did Chevy make the extra 50 horsepower to go from 300hp to 350hp?
Cam? Heads? compression? Combo of all three?
Curious Rick
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Old May 28, 2018 | 01:55 PM
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Originally Posted by Bruce Powelson
Thanks everyone. Unbelievable how many sources are wrong on this. Also, with a 6000RPM tach I’m convinced 350HP is right.
I had the same dilemma because my 68 was marked with HP and for years I assumed it was 300 horse. After seeing numerous posts on here regarding this issue I became convinced that it is 350 horse based on my tach markings.

(I pulled my 327 and replaced it with a BB, my original engine was freshly rebuilt a number of years ago and sits well protected under my stairs in my garage. I wonder what a fresh 327-350 is worth? Hmmmmm)

Last edited by 68/BB; May 28, 2018 at 02:01 PM.
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Old May 28, 2018 | 06:47 PM
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Originally Posted by 68/BB
I had the same dilemma because my 68 was marked with HP and for years I assumed it was 300 horse. After seeing numerous posts on here regarding this issue I became convinced that it is 350 horse based on my tach markings.

(I pulled my 327 and replaced it with a BB, my original engine was freshly rebuilt a number of years ago and sits well protected under my stairs in my garage. I wonder what a fresh 327-350 is worth? Hmmmmm)



Check ebay, what the ask and what they get is 2 different animals. I saw a chevy 2 or camaro listed at $4000


just checked again, guess what


https://www.ebay.com/sch/i.html?_nkw=l79+327
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