The Block # 3970010 Stamped On The Front Of The Block Is Vo8061cy, Heads Are 3927186 , From What I Have Found It Could Be A Lt1 But I Couldnt Find A Cy At The End Of Any #,s I Have Searched. Could It Be A 302 Or Do I Need The Crank And Piston # To Tell That.

ok im completely lost with this engine the cy prifix code tells me this is a 58 283 ci engine. please help.

ok chevy guys ive found that the block i have could be a 58 283, they have the same stroke as a 302 but with a 4 inch bore. am i correct with this.

RW check the engine suffix again (the V08061CY). The 3970010 block didn't start production until 1969 so it's definatly not a 58 engine. You have too many numbers in the suffix code so it's probably something like V0806CYX or similar. All 1970 and later suffix codes start with the letter C and have three letters total.

Ed

ed i rechecked my numbers and they are correct, i checked the prfix code threw a web sight and alot of the 50s engines have just 2 litters. it states a 58 283 for that code. could this be a special motor for just boats only. im thinking its coded that way because it a 350 block with a 283 crank with 4inch bore as a 302. anyhow i still dont know what i have for sure.

Listen to Ed, he's trying to help.
Based on the casting number, that is not a 58 block. If you are sure you got the code correct (sometimes decieving) your block stamp has an extra digit in it from the factory, because as it stands it decodes as:
V Flint
08 August
061 61st day!
Clearly it's August 6th, not August 61st, so something is goofy. As Ed said, the 70 engines, (as well as late 69 Camaro engines, due to extended model year) began with a C. August 6 would fit for early 70 cars.
It's not a 302, as the engine code was DZ, but the heads could be. 186 heads with .202 valves were for DZ and 186 with smaller valves (.192, I think) were for SS350.

thanks guys but i still dont know what i have here. it may be a special order for this boat. the numbers i have listed are correct, it seems to run fairly strong so i think ill keep it and go ahead and put it in my camero. the motor has never been taken out of the boat so it must be something special they ordered threw chevrolet.

Welcome rw_ballard. We hope you find the information you need. I must warn you that the spelling of "camero" in this fashion instead of the correct way (camaro) have lead to untimely and suspicious demise of people that we can not mention. This message will now self destruct.:)

RW,

If you could post a picture of the suffix code, maybe we can get a better idea of what you're seeing.

Ed

Not all engine suffix codes started with a "C" after 1970, that is for cars. The engine suffix codes for trucks started with "T". Could this stamp be V0806TCY?

If it was a 58 block it would not origionally have had a screw on oil filter? Instead it would have had a cannister style filter. More likely than not it has a spin on conversion kit.Take your filter off and see what under it.

Russ,

Good catch. You're probably right, it's a TCY which is a 1973 307 Truck engine, or a 1982 305 Truck engine.

Ed

here is a link to the motor im trying to find out the codes on http://f3.yahoofs.com/users/42eb86b8z38c15017/29a3re2/__sr_/98c2re2.jpg?phIdmLFB7q_En.36 and http://f3.yahoofs.com/users/42eb86b8z38c15017/29a3re2/__sr_/98c2re2.jpg?phwsmLFB9KZSn.36 hope someone can id this engine for me. the # reads V08061CY ITS A 3970010 BLOCK WITH 3927186 HEADS AND THE INTAKE IS 3927184 WITCH IS USED ON ALOT OF 69 CORVETTES AND CAMEROS. I JUST CANT UNDERSTAND THE CY CODE#

That's CAMARO!!!
Not camero.
:sad:

RW,

Your links didn't work for me. Can you try again?

Ed

http://f3.yahoofs.com/users/42eb86b8z38c15017/29a3re2/__sr_/98c2re2.jpg?phwsmLFB9KZSn.36

RW, your link's still not working but your email did.

Here are the two pictures...

PICTURE ONE (http://photos.yahoo.com/ph/rw_ballard/detail?.dir=.e379re2&.dnm=c064re2.jpg&.tok=phqAUpFBIUoKNQxu&.src=mail)

PICTURE TWO (http://photos.yahoo.com/ph/rw_ballard/detail?.dir=.e379re2&.dnm=b493re2.jpg&.tok=phpAUpFBgDrevgNM&.src=mail)

Not great shots, but from the color of the block and the stamping, I'd say this is a "TCY" 1980 305 Truck engine.

Anyone else care to comment?

Ed

in picture 2 it looks like theres a letter behind the CY. Maybe a Z or a 2. Not sure if the 1 is a T but I guess it could be. It looks like a 1 to me. Can you clean the stamping off a little more?

I'd scrape off all of the paint and clean the pad up with thinner. Then take a closer picture.

That is TCY as Ed said. The "T" has a very small cross at the top of the letter. I have seen several of these and as Ed said, it is probably a 305 truck engine. Painted the beautiful "corporate blue" instead of orange. No 58, no corvette, no LT1... just a truck motor. Sorry RW but there isn't anything high performance here unless someone put on a set of 186 heads. kevin

corporate blue, huh... I always called it 305 blue. :)

It was the time of mostly 305 smog engines.

well guys thanks for all your help, but it isnt a 305 im sure of this, the code is a 1 not a t . so i have to go with mikes anwser on nastyz28 under decode forum. thanks for all your assistance. ill have to what tell she need a rebuild to know for sure.

Originally Posted by WS6
These old boat motors cannot be decoded. Since they were not for cars etc, they never published any data and these were low production engines. Only the boat maker would know the spec's, you will never know unless you have the hull number or whatever other numbers they need and then you still may be out of luck. If it was in a pleasure boat then I doubt it was anything special.


3970010 was a 350 casting

3927186 are common heads for this engine, they were used in everything from hi-perf to trucks. Power pak heads are from the late 50's, early 60's on 283's. Don't go by the looks, have to know the valve size to determine performance level.

3947184 was used in 1968 on the 350 engine

It's a 350 block, and a marine engine code; I don't have those - probably a MerCruiser or Crusader. :thumbsup: