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1/28/17 1:51pm - Original Message: '69 427 L71Cylinder Head Casting Lettering'
Ole Biker Gold Member
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Monongahela, PA - USA

Vette(s):
1969 Corvette Coupe. 427/435 4 speed factory installed side pipes. Verified Numbers Matching.

Joined: 7/5/2016
Posts: 63
Hello,
I removed the valve cover from the left cylinder head and saw this cast into the head,

   "HI-PERF"

Does this casting correspond to the correct head for a L71 435 HP engine?

Thanks for any replies!,

Mike





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1/28/17 4:36pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
stingrayjim jr Lifetime Member
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SHELBYVILLE, TN - USA

Vette(s):
1976 L48 auto

1978 L82 4speed

1994 LT1 6speed

Joined: 7/5/2002
Posts: 3934
just doing a quick online search,

cast#             year    port   chamber    engines
14081052...85-87...oval...OPEN...366T, 427T, 454 Truck, Marked "HiPerf"
14092359...86-90...oval...OPEN...366T, 427T, Marked "HiPerf"

check your casting numbers,  if you can post them on here, or you can look them up to establish when yours were made.   I got this info from 

http://garage.grumpysperformance.com/index.php?threads/closed-vs-open-chamber-big-block-heads-and-casting-s.3960/

the two i pasted there was about 2/3 down the page just above the pictures of the dome piston...  
hope that helps :)



|UPDATED|1/28/2017 1:36:41 PM (AZT)|/UPDATED|


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StingrayJim
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Stingray's '76                             StingrayJr's '78                           Lil Red '94

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1/29/17 12:11pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Need the casting number AND date....."Hi Perf" is irrelevant. 

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Joel Adams
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1/29/17 2:16pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Ole Biker Gold Member
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Monongahela, PA - USA

Vette(s):
1969 Corvette Coupe. 427/435 4 speed factory installed side pipes. Verified Numbers Matching.

Joined: 7/5/2016
Posts: 63
Thanks for replies!

I will look at the head again to gather the needed information.

I had an unexpected repair on the wife's Subaru yesterday afternoon that delayed any further posting.  rear brakes and rotors shot, replaced in our heated garage, cozy warm!

Mike


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1/29/17 2:19pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Vman73
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Gig Harbor, WA - USA

Vette(s):
1973 L82 4 Speed Coupe - Very original, well documented driver/survivor. 2016 Bend Regional NCRS Top Flight.

Joined: 10/2/2014
Posts: 357
According to my black book the casting number you are looking for is 3919840 for a '69 435hp cast iron head. The casting date should be anytime before the engine build date stamped into the pad up to six months prior. Not a BB expert, but it looks like the casting number in your pic is behind the third rocker from the rh side (#5 intake). The casting date looks like it's just to the left of the #1 intake rocker. Take a peek and let us know what you see. Nice car !!

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John Sigmund
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1/29/17 5:00pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Ole Biker Gold Member
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Monongahela, PA - USA

Vette(s):
1969 Corvette Coupe. 427/435 4 speed factory installed side pipes. Verified Numbers Matching.

Joined: 7/5/2016
Posts: 63
Thanks!

I saw the partial in the original picture, just not enough of  view>


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1/29/17 5:56pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Ole Biker Gold Member
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Monongahela, PA - USA

Vette(s):
1969 Corvette Coupe. 427/435 4 speed factory installed side pipes. Verified Numbers Matching.

Joined: 7/5/2016
Posts: 63
Head Casting Number,  3964291

According to this site I am legit!!

http://www.nastyz28.com/bbcmenu.php






|UPDATED|1/29/2017 2:56:13 PM (AZT)|/UPDATED|


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1/29/17 5:53pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Ole Biker Gold Member
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Monongahela, PA - USA

Vette(s):
1969 Corvette Coupe. 427/435 4 speed factory installed side pipes. Verified Numbers Matching.

Joined: 7/5/2016
Posts: 63
I believe this is the casting date, maybe not?







|UPDATED|1/29/2017 2:53:51 PM (AZT)|/UPDATED|


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1/29/17 6:33pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Can't make out the first letter, but if it is an "E", it is May 3, 1968....if it is "F", it is June 3, 1968. As long as the date is BEFORE engine build date, yer golden.  Thumbs Up

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Joel Adams
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1/29/17 6:34pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Vman73
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Gig Harbor, WA - USA

Vette(s):
1973 L82 4 Speed Coupe - Very original, well documented driver/survivor. 2016 Bend Regional NCRS Top Flight.

Joined: 10/2/2014
Posts: 357
Hey Mike - just doubled checked 3 different sources and they all point towards the 3919840 number I originally posted for a '69 L71. I also see your reference to the NastyZ28 site. Not sure why the descrepency, but welcome to the world of Corvette "matching numbers". I also found reference to your casting number 3964291 on another website that you might want to check out, www.minuit10.net. They show that casting as '69/'70 427 but do not list it as an L71 435hp application. Same rectangular port, big valves as the 840 casting but the size of the combustion chamber is slightly different. Yours might still be correct, like I said I'm certainly not a BB guy, definately worth more research. The casting date you posted is either E or F 3 8, which equates to a May or June 3rd, 1968. Those dates would be correct for a relatively early (Aug thru Dec '68 engine/car build date of a '69 car. Since the head casting numbers are just one piece of the puzzle, have you ever researched your block casting and engine stamp pad info ?? They should give you further clues as to your L71.

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John Sigmund
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1/29/17 7:32pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Ole Biker Gold Member
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Monongahela, PA - USA

Vette(s):
1969 Corvette Coupe. 427/435 4 speed factory installed side pipes. Verified Numbers Matching.

Joined: 7/5/2016
Posts: 63
Block Number,



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1/29/17 10:18pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Vman73
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Gig Harbor, WA - USA

Vette(s):
1973 L82 4 Speed Coupe - Very original, well documented driver/survivor. 2016 Bend Regional NCRS Top Flight.

Joined: 10/2/2014
Posts: 357
Mike, that is a pic of your engine stamp pad and it all looks great !! The first part T0820LR equates to T for Tonawanda engine assembly, 0820 is your engine assembly date of August 20th '68, very early car and the good news is that it lines up well with the May (or June) casting dates on the heads. LR is probably the best news because that is the engine suffix code for 427 cu.in., 435hp, manual transmission !! The second part of the stamp, 19S729961 is the vin dirrivative. 1 is for Chevrolet, 9 is the model year, '69, S is for St. Louis final assembly and the last six digits 729961 should match the last six digits of your VIN. So if indeed your car is that VIN with a manual transmission, your well on your way to a legit L71. The next things to look for if you want to know more of the puzzle is the block casting number and date code. They are located on the back of the block between the cylinder heads and the bell housing. Casting number is on the passenger side of the block and date code is on the drivers side (that may be vise versa on a BB). Post those #'s and we can decode a bit further.

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John Sigmund
valkman57@sbcglobal.net
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1/29/17 10:54pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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3964291(rectangle port, closed chamber, 396, 402, 427, 454, 109cc chambers), comes up for a '70 LS7 in Corvette, but were also used for the 435. 

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Joel Adams
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1/29/17 11:22pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Vman73
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Gig Harbor, WA - USA

Vette(s):
1973 L82 4 Speed Coupe - Very original, well documented driver/survivor. 2016 Bend Regional NCRS Top Flight.

Joined: 10/2/2014
Posts: 357
Adams' Apple said: 3964291(rectangle port, closed chamber, 396, 402, 427, 454, 109cc chambers), comes up for a '70 LS7 in Corvette, but were also used for the 435. 



Cool, Thanks for the confirmation Joel !!

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John Sigmund
valkman57@sbcglobal.net
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1/30/17 12:04am - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Ole Biker Gold Member
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Monongahela, PA - USA

Vette(s):
1969 Corvette Coupe. 427/435 4 speed factory installed side pipes. Verified Numbers Matching.

Joined: 7/5/2016
Posts: 63
I very much appreciate the replies to my posts.  I am not a Rat Motor expert as I owned Mouse motored Chevy's in my youth.

The VIN  engine number matches the VIN on the side of the windshield. The car is a close ratio 4 speed manual. it has the Transistor Ignition which I believe came wit the L71 option.  From what little I ascertained on the car I felt confident enough to purchase it last July.  I am investigating details such as the head castings and such over the winter.

The 69 Vette had revisions to the car throughout the run.  From Wiper Vacuum canister and vacuum system runs to body moulding revisions, three all told. a real piecemeal of varied parts!

I will get the block number tomorrow, as family was over for supper earlier today.


|UPDATED|1/29/2017 9:04:13 PM (AZT)|/UPDATED|


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1/30/17 2:31pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Vman73
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Gig Harbor, WA - USA

Vette(s):
1973 L82 4 Speed Coupe - Very original, well documented driver/survivor. 2016 Bend Regional NCRS Top Flight.

Joined: 10/2/2014
Posts: 357
Your welcome, glad to help out. Looks like you've got a great car !!

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John Sigmund
valkman57@sbcglobal.net
NCRS Member 61302
NW NCRS Chapter Member



Duct tape is the new Black !!
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1/30/17 4:51pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Ole Biker Gold Member
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Monongahela, PA - USA

Vette(s):
1969 Corvette Coupe. 427/435 4 speed factory installed side pipes. Verified Numbers Matching.

Joined: 7/5/2016
Posts: 63
Rear Block Casting Number, Drivers Side.  Not a perfect picture as little room between block and firewall.

Number appears to be 3963512 with a capital T sideways below number.



|UPDATED|1/30/2017 1:51:01 PM (AZT)|/UPDATED|


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1/30/17 6:08pm - Reply: 'Re: 69 427 L71Cylinder Head Casting Lettering'
Ole Biker Gold Member
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Monongahela, PA - USA

Vette(s):
1969 Corvette Coupe. 427/435 4 speed factory installed side pipes. Verified Numbers Matching.

Joined: 7/5/2016
Posts: 63
Passenger Side Rear Block Date Stamping.  Appears to be F 5 9







|UPDATED|1/30/2017 3:08:26 PM (AZT)|/UPDATED|


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