Ran the number of the block of a recent non-matching purchase of a 73 coupe and discovered that block was from a 1966 "tall truck" rated at 222hp. However, the information was listed under the "big block" info. Nothing on the motor resembles a bb. Makes me think the 366 was the pre-cursor of the 350 anyone have info. or a thought?

thanks

mike

mikey55 said: Ran the number of the block of a recent non-matching purchase of a 73 coupe and discovered that block was from a 1966 "tall truck" rated at 222hp. However, the information was listed under the "big block" info. Nothing on the motor resembles a bb. Makes me think the 366 was the pre-cursor of the 350 anyone have info. or a thought? thanks mike

can you list the casting number and engine code and let us do some looking on our own ??

# on front rt(pass) side of block under head V10147YZ,
sm. # under the above # 66B117669
# on back lt(driver) side of block next to bellhousing 3970014
# on opp. side of from above J10B
# on intake 3997771
headers for exhaust
sm. blk 7 blade fan with rounded tip and clutch
correct AC #1131002
correct two snorkle air cleaner
alt. # 1100544
starter #1108418

thanks in advance for any info, but, I think it was a pre-cousor. Everthing else in correct sm. blk for 73.

Just out of curiousity... are the exhaust ports evenly spaced apart, or are the center 2 exhaust ports together with the 2 end ports away from the center?
That casting # shows it to be a 70-76' 350. Weird.

I recall the 366ci was a big block. I've seen them in some of the older "U-Haul"/"Ryder" rental trucks.
Sarge


|UPDATED|8/19/2004 6:15:03 PM (AZT)|/UPDATED|

ive got one source that says

3970014
350
69-72
All Chevrolet
2 & 4 Bolt Mains

another (better source)
3970014....350...70-76...2 or 4

and another even better source

3970014
350
69-77
Pass, Chevelle, Camaro, Nova, Monte Carlo
2 or 4 Bolt Main

3970014
350
69-79
Truck
2 or 4 Bolt Main

3970014
350
72
Corvette
Late 72, 200 HP, 255 HP, 4 Bolt Main

but i definitely think the source that says you have a 366 is wrong.. all of my sources say 350...

a 366 is a big block and I couldnt find any 366 casting numbers close to 3970014

the 366 is a de-bored 396

Engine Bore Stroke
366 3.935" 3.760"
396 4.094" 3.760"
402 4.125" 3.760"
427 4.250" 3.760"
454 4.250" 4.000"
502 4.468" 4.000"


after looking at the engine code though.. it isnt the vette engine.. vette engine start with T (tonawanda plant)

Are you sure the last three digits of your code are actually "7YZ" instead of "TYZ"

1975 TYZ 350 conv.cab L LS9 165hp 4bolt C-10 to 2500

Also.. multiple sources confirm this block code. There is no other YZ block code ever used.

I would say that this is the corrcet casting usage

3970014
350
69-79
Truck
2 or 4 Bolt Main

and that it is from a 1975 truck with 4 bolt mains and 165hp

|UPDATED|8/19/2004 7:00:34 PM (AZT)|/UPDATED|

Ok I put on some better glasses and sure enough the "7" is a "T" for a number:V1014TYZ, The exhaust ports are: two middle close, two ends far.

he was asking about exhaust port config to see if it was a big block or small..

the 1-2-1 exhaust is definitely small block

the precursors to the 350 were 265,283,327

there is also a 302,305,and 400 SB

the 366 is a debored 396 whose whole purpose in life was to provide big block torque to trucks.

if you want to look at my sources.. goto my links page... the first section is the reference links.. look at all the casting number links and a little further down are the engine code links.

also give us the casting number for the heads.. we can look them up..

the only difference in the 350/4-bolt 165 hp motor you have and the original vette motor was the heads/cam... if it still has the vette heads you are in good shape..

hopefully they just did a short block swap..

you can drop in a nicer cam and have a good engine.. if you have the truck heads you may want to replace them with something that breathes a little better.

|UPDATED|8/20/2004 2:20:47 AM (AZT)|/UPDATED|

If I recall, I maybe wrong, the 366 shares the configuration with the 409. Both had an odd valve cover with two large notched in the bottom side of the cover. I know the 409 was like this. They were considered big blocks, but not the same as the big block we all know. Stingray Jim and I discussed this, and agree. Maybe we are both wrong about the 366, but that is the 409

kstyer said: If I recall, I maybe wrong, the 366 shares the configuration with the 409. Both had an odd valve cover with two large notched in the bottom side of the cover. I know the 409 was like this. They were considered big blocks, but not the same as the big block we all know. Stingray Jim and I discussed this, and agree. Maybe we are both wrong about the 366, but that is the 409

I politely disagree with you gentleman.. the 348 and 409 are the old chevy big blocks.

the 366 is in the 396-454 family.

the 366 was produced into the 80's for cargo trucks..