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#1 |
*************
![]() Join Date: Apr 2005
Location: Pensacola, FL
Posts: 17,846
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Big block questions.....
What do these numbers on the front of the block represent, T02090 THB? It's a 72 402 based of the casting numbers on the rear of the block. I'm pretty sure the first T is for Truck, but I'm not sure what the rest of the numbers stand for (VIN#'s ???).
Also, it's got a cast iron intake on it that has "HOLLEY" embosed on it. Anyone know anything about this? WIW?
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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#2 |
Registered User
Join Date: Dec 2004
Location: Northern AZ
Posts: 7,271
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Re: Big block questions.....
The prefix portion of the ID code tells you the assembly plant code, and the engine's production date (for example, 0701 = July 1st....no year is indicated).
T 02090 Looks like the first T = Tonawanda and the rest 02090 is the date 02/09/70 would be my guess, but it is a 72 model so not sure. The block should have a date code cast into it as well. But by the three letter code it is a 402 from a truck. The suffix portion tells you the original model year / engine / transmission / car combination when it went down the assembly line (for example, CTY = 1970 396 Camaro, 375 hp, 11.0:1, TH400). THB 1972 Truck 402 210 400 L-47 30, fwd As for the holley cast intake, I'd love to see the intake, I was not aware Holley made a cast iron intake, but they could have. As for value? Is it a running driving motor? If it is and everything is A-OK somewhere between $300-800 (remember gas is $/gal) and a 396/402 isn't as popular as the 454's. Just my opinion. If it was a 396 out of a Chevelle or camaro and had the 3 let code to verify, it might be worth more? Last edited by 70rs/ss; 07-29-2008 at 05:43 PM. |
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#3 | |
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![]() Join Date: Apr 2005
Location: Pensacola, FL
Posts: 17,846
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Re: Big block questions.....
Quote:
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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#4 |
Senior Member
Join Date: Aug 2003
Location: Lubbock, Texas
Posts: 2,443
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Re: Big block questions.....
The intake looks like mine. It is a GM (Holley) cast Iron.
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72 Cheyenne Super 80 Silverado Blazer 2wd |
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#5 | |
Registered User
Join Date: Dec 2004
Location: Northern AZ
Posts: 7,271
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Re: Big block questions.....
Quote:
The casting numbers from the back of the block were used and reused (so several motors could have the same casting number), but, the stamped numbers are for that block and only that block (more reliable than the casting number, IMO). As far as the date code in the T02090 series, I am not positive about the number being the date or if it is part of the VIN as the quote I attached says it is a date, but 02/09/ 0? if it is 70, and it could be. Then the motor was cast in 72 but then stamped in 70 (not likely) I think the numbers are part of the date and the extra 0 is nothing maybe, or it is the VIN, what are the last few numbers of the VIN?? As for the intake, it could be a GM/Holley collaboration for a Perf BBC. I have seen High rise BBC cast manifolds on Chevelle motors and such, just didn't know holley helped?? A casting number off the intake will help to ID what it came on if a GM number, may be worth some coin if it off of a muscle type high HP 427 like a vette? |
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#6 | |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
Posts: 6,513
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Re: Big block questions.....
Quote:
They worth a little money, but nothing like rectangular port high HP intakes. The cast iron intakes were made for mid-level performance, usually topping out around 350HP.
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! |
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#7 | |
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![]() Join Date: Apr 2005
Location: Pensacola, FL
Posts: 17,846
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Re: Big block questions.....
Quote:
How much is it worth??
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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#8 |
Senior Member
![]() Join Date: Aug 2001
Location: Kansas City, Mo
Posts: 1,029
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Re: Big block questions.....
So how much HP would a 402 have?
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DREW67 |
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#9 |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
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Re: Big block questions.....
A '70 402 is rated at 310HP and 400 ft lbs of torque. '71 is rated 300HP and 400 ft lbs. '72 is rated 240 HP and 345 ft lbs with net HP ratings (dyno'd as installed, with belts, accessories, etc.) as opposed to the gross HP ratings that were used up until 1971.
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! Last edited by 67_C-30; 07-29-2008 at 10:30 PM. |
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#10 |
Senior Member
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Location: Kansas City, Mo
Posts: 1,029
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Re: Big block questions.....
Wow I thought the 72 had more HP I might have to second think my project.
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DREW67 |
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#11 |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
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Re: Big block questions.....
Keep in mind that the '71 and '72 engines are almost identical, its just that the way they calculated the numbers changed.
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! |
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#12 |
Registered User
Join Date: Dec 2004
Location: Northern AZ
Posts: 7,271
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Re: Big block questions.....
I've seen some tests done back in the day on a 70 Z28, 71 Z28, and a 72 Z28. Now obviously not apples to apples, but the 70 was rated 300hp, the 71 26 ish hp, and the 72 240hp, but in a race the 72 outran the 70 (testing was done in each new model year by Hot Rod or one of the mags) they took the times from each year and did a simulater race. The reason I point this out is that yeas the hp rating went down, but GM went from gross (on a dyno with no accessories) to net (tested as installed with all accessories) and the difference in compression went down over the 3 years and that seemed to help the later motor get more useable power and is OK with cheap gas of today! If I was going to build a motor, it doesn't matter what year it came from or the factory numbers as I will replace the pieces in order to improve perf. If I was buying a bone stock original motor to use as is, the 70 may appear appealing, but it would also have 98cc heads and a pop-up piston for about 10-11:1 compression and would rather premium fuel over 87 octane. For every benefit, there is a price to pay, high HP means high compression which then requires premium fuel, the price you pay to go fast!
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#13 |
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Location: Pensacola, FL
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Re: Big block questions.....
Bringing this back up. On the back of the block on the drivers side it says:
HI PERF PASS 11 and there's a big K anyone know what this means?
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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#14 |
It'll Buff Out!
![]() Join Date: Apr 2007
Location: San Diego
Posts: 603
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Re: Big block questions.....
I can't see from the pics but I am curious is that a dual plane intake or set up for direct q-jet bolt on.
It looks a lot better than my stock 72 intake with small runners. thanks.
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"Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB |
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#15 |
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Location: Pensacola, FL
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Re: Big block questions.....
It's a dual plane Holley intake. Quadrajet will bolt up. I've got a 750 dual feed holley also if you are interested. Are you interested in the aluminum valve covers too?
R/
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 Last edited by Hart_Rod; 08-22-2008 at 11:05 PM. |
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#16 |
Registered User
Join Date: Jan 2006
Location: Houston
Posts: 434
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Re: Big block questions.....
Based on the date of your intake I'd say it's for an engine for the 66 model year. Is there a boss on drivers side top near water neck with 1/2" pipe thread for a temperature sender?
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#17 |
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![]() Join Date: Apr 2005
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Re: Big block questions.....
That's correct.
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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#18 |
It'll Buff Out!
![]() Join Date: Apr 2007
Location: San Diego
Posts: 603
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Re: Big block questions.....
So even though this intake is off a 66 its a direct bolt on for a 72 402?
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"Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB |
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#19 |
Registered User
Join Date: Jan 2006
Location: Houston
Posts: 434
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Re: Big block questions.....
Yes, it would be a direct bolt on but there are differences under the manifold under the carb. I don't know what the differences do. The temperature boss is a sure way to tell the diffeence between 66 and 67 from the 68 and later ones. That intake is probably for a 66 Chevelle. The cast number 3883948 and cast date lean towards this. As for the engine, it would be interesting to see what the cast date is under the starter.
Last edited by stope4; 08-24-2008 at 11:01 PM. |
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#20 | |
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![]() Join Date: Apr 2005
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Re: Big block questions.....
Quote:
Does the HI PERF PASS mean anything?
__________________
Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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