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#21
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This may be too logical but someone went through a lot of trouble to grind the casting numbers off ... presumably because the heads aren't correct to the car or the motor. Date codes might be close but wrong type of heads and maybe even a mismatched casting numbered pair.
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Triple Black 1971 GTO |
#22
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Quote:
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Three times the sound peaks, falls back, peaks again. A throttling back to cruising speed, a dwindling grumble of thunder and...gone. The frogs take up where they left off. |
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#23
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Took a wire brush to them, date code is definitely E069.
May 1969. But it looks like there are a 1 and 1 on the casting pads, WTH? I tried to edit the pictures but they kept uploading in the original direction.
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69 GTO Convertible, 4000lbs 462ci, 606tq/569hp - 93 oct at 34 deg (207psi) 11.7:1, KRE H Ports, Lunati HR 282/290 w Johnson Lifters & 1.65 Scorp, E30, EFI, Holley HP + Dual Sync, 12-1 Crank Trig, 120lb Inj & 1000cfm TB, Torker II EFI Int & Rails, PTC 10" 0 Stat, Ricks SS Gas Tank, Magna 4303, Aerom EFI Reg, Aero Front & Wilwood Rear Disc Brakes, Dougs 1 7/8" Headers & Borla Pro XS 3" Muffs, Alum Rad & Dual Fans, 12:1 Box, UMI Control Arms & Viking Berz Fr + Rear CO Shocks, Hella UP28 Vac Pump |
#24
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Those impression are not the number 1, they are the impression remains of the flat head screws used to hold the number plates in the casting mold as in my far clearer picture here shows.
The only way for you to better nail down what it is you have for Heads there at this point is to CC a few chambers. Also those heads may have started life as 2bbl heads with pressed in studs, so if you yank out some of those studs and guide plates it may be possible to determine that or not, or post up some pictures of the chamber side of the head so we can see if they indeed started off as small valve heads.. If this is the case then they might have been a number 46 casting .
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 05-09-2021 at 07:22 AM. |
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#25
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If there was grinding would that be noticable? The grinder should leave a mark at least 1 over time. Yes cc em easy way to tell. Big thing would be no cracks.
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#26
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Pontiac heads that where once done by many of the big rebuilders that sold nation wide back in the day would just grind off the casting numbers to cut down on the head inventory needed.
If two different casting number heads heads started life within 5 CCs of chamber size of one another the rebuilder would just mill the bigger chamber head .030” instead of just making a .002” clean up cut. In terms of a rebuilt head and the crappy paint rebuilders used on them if back in even 75 you slapped on a set of rebuilt heads, then after just 8 to 10 years of every day street running the remains of any grinding work done would have just rusted away aided by the heat of the exh ports!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 05-09-2021 at 08:30 AM. |
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