Help identifying engine - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Socalrider87 · 04-07-2018, 09:06 PM

I’ve tried looking for the engine stamp on my engine but can’t seem to find it. The truck is new to us and I’m trying to find out what engine is in the truck. The truck is a 1970 C20 Longhorn with V8 400 badges on it. I need to get a new carb and do a tune up on it but am stuck in the water as far as what parts to get. Reading thru the forums You guys are some very knowledgeable guys so I’m hoping someone can help me figure this out.
Thanks

Bigdav160 · 04-07-2018, 09:10 PM

Look behind the fuel line and A/C compressor bracket. Your engine looks like it was born in that truck

truckster · 04-07-2018, 09:15 PM

The valve covers identify it as a big block. Most likely a 402.

57rookie · 04-07-2018, 09:46 PM

That is a sweet big block 402 - high option truck with cruise and A/C.
NICE!!!!

Socalrider87 · 04-07-2018, 11:51 PM

Quote:

Originally Posted by Bigdav160

Look behind the fuel line and A/C compressor bracket. Your engine looks like it was born in that truck

Sorry for the newbie question but actually behind the ac bracket as in remove it to see the stamp? I shined my flashlight all around that area and couldn’t see any numbers. Any other indicators that would tell me that it’s a 402 vs a 396?

*randy500* · 04-08-2018, 01:11 AM

The stamping on the block is on the flat portion where the head attaches, almost directly under the upper hose clamp on the fuel line in the picture you posted. Use a flashlight and clean the area with scotchbrite, wire brush or a rag with degreaser.

Socalrider87 · 04-09-2018, 09:37 PM

I was looking up the rebuild kit for my carb Quadra jet 7040206 and on the Quadrajet site it says that that carb was put on the GM 396, is that carb also on the 402 stock? Still no luck with the stamp

truckster · 04-09-2018, 10:24 PM

Quote:

Originally Posted by Socalrider87

I was looking up the rebuild kit for my carb Quadra jet 7040206 and on the Quadrajet site it says that that carb was put on the GM 396, is that carb also on the 402 stock? Still no luck with the stamp

They're basically the same engine. The 402 has a slightly larger bore.

RustyBucket · 04-09-2018, 10:42 PM

Are you looking here? Illustrated in the upper right hand corner ENGINE ID/V.I.N. CODE. Sometimes it's hard to see 'cause it's greasy/nasty.

**Steeveedee** · 04-09-2018, 11:30 PM

Is the Service Parts ID (SPID) sticker still on the glove box door? If so, it will list the options that the truck was equipped with. It does appear to be a lot like my truck, which was factory equipped with a BBC 400 (402). But I don't have cruise control.

Go here or call Cliff and give him the part number off the carburetor.

https://cliffshighperformance.com/

68Gold/white · 04-10-2018, 10:24 AM

Buy Cliff's book, and parts. His parts are ethanol resistant, and better quality than anything you can buy.
Buy his deluxe kit (the more expensive one) it is worth it, has parts no one else puts in a kit, or even sells. When you order, he can send you all parts needed to set up your carb, exactly for it's application.
He has a kit to re-bush the primary throttle shafts, you will need that also.

Socalrider87 · 04-10-2018, 11:55 AM

Unfortunately it doesn’t have the SPID in the glove box. Thanks for the suggestion on the cliffs products. Are you referring to the SR or the HP kit?

68Gold/white · 04-10-2018, 12:19 PM

Quote:

Originally Posted by Socalrider87

Unfortunately it doesn’t have the SPID in the glove box. Thanks for the suggestion on the cliffs products. Are you referring to the SR or the HP kit?

it's the HP kit, the more expensive one, it's worth every penny.
When you call, you will talk to Ray. He will need your carb number, and a somewhat detailed idea of the vehicle. Gear ratio, trans type, etc...
Cliff can send everything needed to calibrate the carb, the first time. You will also need the marine tex epoxy kit to seal the well plugs in the main body.

If you have questions after starting the build, email Cliff. He stays so busy, he can't afford to be on the phone.

El Dorado Jim · 04-10-2018, 05:34 PM

Quote:

Originally Posted by Socalrider87

I’ve tried looking for the engine stamp on my engine but can’t seem to find it. The truck is new to us and I’m trying to find out what engine is in the truck. The truck is a 1970 C20 Longhorn with V8 400 badges on it. I need to get a new carb and do a tune up on it but am stuck in the water as far as what parts to get. Reading thru the forums You guys are some very knowledgeable guys so I’m hoping someone can help me figure this out.
Thanks

if it's the original engine it is the 402....

04-07-2018, 09:06 PM	#1
Socalrider87 Registered User Join Date: Apr 2018 Location: Highland, ca Posts: 8	Help identifying engine I’ve tried looking for the engine stamp on my engine but can’t seem to find it. The truck is new to us and I’m trying to find out what engine is in the truck. The truck is a 1970 C20 Longhorn with V8 400 badges on it. I need to get a new carb and do a tune up on it but am stuck in the water as far as what parts to get. Reading thru the forums You guys are some very knowledgeable guys so I’m hoping someone can help me figure this out. Thanks Attached Images

04-07-2018, 09:10 PM	#2
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: Help identifying engine Look behind the fuel line and A/C compressor bracket. Your engine looks like it was born in that truck __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe

04-07-2018, 09:15 PM	#3
truckster Registered User Join Date: Jan 2001 Location: Orem, Utah Posts: 8,021	Re: Help identifying engine The valve covers identify it as a big block. Most likely a 402. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

04-07-2018, 09:46 PM	#4
57rookie Registered User Join Date: Jul 2011 Location: Calgary, Alberta Posts: 153	Re: Help identifying engine That is a sweet big block 402 - high option truck with cruise and A/C. NICE!!!!

04-08-2018, 01:11 AM	#6
randy500 Account Suspended Join Date: Jul 2016 Location: Tacoma, WA Posts: 6,873	Re: Help identifying engine The stamping on the block is on the flat portion where the head attaches, almost directly under the upper hose clamp on the fuel line in the picture you posted. Use a flashlight and clean the area with scotchbrite, wire brush or a rag with degreaser.

04-09-2018, 09:37 PM	#7
Socalrider87 Registered User Join Date: Apr 2018 Location: Highland, ca Posts: 8	Re: Help identifying engine I was looking up the rebuild kit for my carb Quadra jet 7040206 and on the Quadrajet site it says that that carb was put on the GM 396, is that carb also on the 402 stock? Still no luck with the stamp

04-09-2018, 10:42 PM	#9
RustyBucket Registered User Join Date: Jul 2009 Location: Space Coast, Fl. Posts: 1,055	Re: Help identifying engine Are you looking here? Illustrated in the upper right hand corner ENGINE ID/V.I.N. CODE. Sometimes it's hard to see 'cause it's greasy/nasty. Attached Images __________________ Dad always said, "Son, WISH IN ONE HAND, and ......." -------------------------------------- -------------------------------------- Current toy trucks: '71 GMC 1500 SUPER CUSTOM short/step, orig. dk. blue, 350/700r, ps,pb, A/C '72 Blazer 2wd, ochre & white, 454, tremecTKO 500 5spd. ps, pb, A/C, tilt Last 10yrs of hobby vehicles, had a FEW more in the 50yrs. before these: '66 Plymouth Belvedere City of Miami cop car clone. '70 Nova 406"sb, 13.5-1, solid roller, Brodix, p.glide/t.brake, back halved, 9" Ford, spool 4.88, cage,ladder bar/coilover, 10.5 tire....... SOLD!! '67 C10 short/step side mount spare -- SOLD!! '72 Jimmy 2wd, 350/350, ps, pb, fun driver, lots of bondo & a shiny red paint job..... SOLD!! '69 Nova 350, 4spd, A/C, ps, p.b, ...SOLD!! Last edited by RustyBucket; 04-09-2018 at 10:46 PM. Reason: typoo

04-09-2018, 11:30 PM	#10
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,937	Re: Help identifying engine Is the Service Parts ID (SPID) sticker still on the glove box door? If so, it will list the options that the truck was equipped with. It does appear to be a lot like my truck, which was factory equipped with a BBC 400 (402). But I don't have cruise control. Go here or call Cliff and give him the part number off the carburetor. https://cliffshighperformance.com/ __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

04-10-2018, 10:24 AM	#11
68Gold/white Registered User Join Date: Sep 2011 Location: Ark City, Kansas Posts: 3,448	Re: Help identifying engine Buy Cliff's book, and parts. His parts are ethanol resistant, and better quality than anything you can buy. Buy his deluxe kit (the more expensive one) it is worth it, has parts no one else puts in a kit, or even sells. When you order, he can send you all parts needed to set up your carb, exactly for it's application. He has a kit to re-bush the primary throttle shafts, you will need that also.

04-10-2018, 11:55 AM	#12
Socalrider87 Registered User Join Date: Apr 2018 Location: Highland, ca Posts: 8	Re: Help identifying engine Unfortunately it doesn’t have the SPID in the glove box. Thanks for the suggestion on the cliffs products. Are you referring to the SR or the HP kit?



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