Is my motor a 302 or 350?

[murguia]

Cast number is 3970010
Date code A208

I couldn't locate the suffix code, do the heads need to Be off for this?

The motor just started to knock, I just want to make sure its a 350 before I have it rebuilt

[michael bustamante]

i hope its not a 302. thats a furd motor! lol
0010 `s are a 350 motor

[Andy4639]

Not all 302 are Ford motors. But non where ever put in a truck of these years! If it's stock it's either a 307 are a 350 if it is a 69 -72.
If it's a 67-69 it could be a 283.

Chevy Camaro's had 302 in them! Just for info!
The 1967-69 Z/28 302 cubic inch small block V8

[jocko]

Z28 chev 302 would be a sweet motor, but not stock for our trucks.
3970010 is for a 69-79 302 OR 350 w/2 or 4 bolt mains. i.e. common short block. Any 3 letter ID codes on the back behind the driver's side head?

[Fitz]

Originally Posted by michael bustamante

i hope its not a 302. thats a furd motor! lol
0010 `s are a 350 motor

Guess you've never heard of the infamous Z28 Camaro. The Z/28 performance package was designed (with further modifications) to compete in the SCCA Trans-Am series. It included a solid-lifter 302 V8, 4-speed transmission, power disc brakes, and two wide stripes down the hood and decklid. Red line was about 8,000 RPM and that was one very strong motor!

[murguia]

I'm thinking it's a 350, it's a 2 bolt not 4 bolt. What year is A208? I'm sure this isn't the original motor, bust was running really strong prior to the knocking

I'm no gear head, just love these trucks. Are 2 bolts worth rebuilding? Or should I be looking to buy a 4?

[murguia]

Date

[leftybass209]

Originally Posted by jocko

Z28 chev 302 would be a sweet motor, but not stock for our trucks.
3970010 is for a 69-79 302 OR 350 w/2 or 4 bolt mains. i.e. common short block. Any 3 letter ID codes on the back behind the driver's side head?

Exactly! a DZ302 motor would not have been an OEM engine for these trucks. It would also have a Camaro VIN stamped in the block, and a C-series pickup would not have its VIN stamped in the block.

If it so happened to be the much more rare DZ302, the VIN would be located on the pad in front of the passenger-side cylinder head, unless the block has been decked, or near the oil filter. It also would only be from a 1969 Camaro of mid-late year production as the 67,68 and early 69's had a different block casting number.

If it is a 4" bore block it could also be a 327. If it has 4-bolt mains, it could only be a 302 or 350. (only 1969 Camaro 302's had 4-bolt main caps, as well as the thicker webbing).

Well, I hope that clears it up!!!!

[murguia]

Hahah so either way, I think I'll be okay with rebuilding this motor. I've heard good things about the 3970010s

[murguia]

This is where I thought the suffix numbers would be butane the paint is too thick over them

[leftybass209]

YES! you will be fine rebuilding that engine. Even as a 2 bolt, it would be plenty strong for any street build or mild racing.

Honestly, if you are rebuilding it, you should consider stroking to a 383. While most people immediately think racing when they hear 383 stroker, the truth is it will produce more torque than the 350 for a negligible amount of fuel consumption (if built comparably) to help get these trucks moving!

[EARNHARDT#3]

Originally Posted by michael bustamante

i hope its not a 302. thats a furd motor! lol
0010 `s are a 350 motor

And 351's are GMC V6's

[68bowtie]

Originally Posted by murguia

What year is A208?

January 20, 1978. 350.

[Stocker]

Originally Posted by leftybass209

Honestly, if you are rebuilding it, you should consider stroking to a 383. While most people immediately think racing when they hear 383 stroker, the truth is it will produce more torque than the 350 for a negligible amount of fuel consumption (if built comparably) to help get these trucks moving!

Yes, depending in part on your truck and how you'll be using it. I have always regretted not having my 350 rebuilt as a 383, but at the time it would have hit the budget too hard. I live in mountainous country and the K20 weighs 5300# empty. I would love to have the extra torque of a stroker.

[TBONE1964]

If you cannot read the suffix code on the pass side front of the deck, then you have no way of knowing the actual origin of the engine. I would think the block has been decked if you cannot read anything. You can also scratch the paint of to verify.

3970010 blocks are 4 inch bore blocks that could be a 302, 327 or a 350. All three had a different stroke with the same connecting rods. 3 inch on a 302, 3.25 on a 327 and 3.48 on a 350. These means the crank is different in all three engines. 010 does not denote 2 or 4 bolt. Most truck 010 blocks were 4 bolt but the only way to know for sure is to pull the oil pan. There is nothing stamped on the block that is an indicator of 4 bolt mains.

If you can measure from the center line of the crank journals to the center line of the rod journals, that will tell you the stroke in inches. Either you have 3 inch, 3 1/4 inch or 3 1/2 inch.

Check the casting number and date on the heads as well. If the heads have bolt holes in the front/rear, then they are 69 and later heads.

Hope this helps.
Tom

[special-K]

There is a suffix code on a '68 010 block that could be Z/28, SS350 (350hp) Camaro, or 327/TH400 pickup (high nickle, 4-bolt, steel crank)

No matter what, the 010 block in 2 or 4-bolt is worth rebuilding. I like a 383 for a truck as well. I've had 400s in these trucks and the torque is just right. Actually helps gas mileage. Put that crank in a 350 and you have it's 17 cu in smaller brother. Small block economy with big block power

[michael bustamante]

Originally Posted by Fitz

Guess you've never heard of the infamous Z28 Camaro. The Z/28 performance package was designed (with further modifications) to compete in the SCCA Trans-Am series. It included a solid-lifter 302 V8, 4-speed transmission, power disc brakes, and two wide stripes down the hood and decklid. Red line was about 8,000 RPM and that was one very strong motor!

nope i never knew we had a 302... my bad... I better go back to classic chevy school
All you guys jumpin on me like hyenas on a fresh kill....hahaha

[TBONE1964]

Originally Posted by michael bustamante

nope i never knew we had a 302... my bad... I better go back to classic chevy school
All you guys jumpin on me like hyenas on a fresh kill....hahaha

Shame on you Michael. I mean how could you not know that.

Further more, what would the "Mr. Know It All's" do here if it were not for dummy's like us

[jocko]

[QUOTE=murguia;7364026]This is where I thought the suffix numbers would be butane the paint is too thick over them[y/QUOTE]

Thank you! Yes, correct and I mis-spoke above. Meant suffix code but was thinkin of casting # location for some reason Thx for correcting.

[cypressbog]

Tear down that 010 block and have a micrometer check inside the piston sleeves. That motor may already be maxed out at 60 over.

[Fitz]

Originally Posted by EARNHARDT#3

And 351's are GMC V6's

...and 702 inch V12's are two, end to end! I really want this COE.

[NGN]

According to my book which is about 37 years old , how to rebuild your SMALL-BLOCK CHEVY by David Vizard them numbers say (CID 350) (years used, 68-76) (used in, Trucks and high performance applications ( 4-bolt mains ) also adds *First six-month's production used mechanical cam, not hydraulic. and *Sometimes machined for 2-bolt mains.