Engine ID # location

[jmikulec]

Here is the code on the head: 3856638.

[jmikulec]

The guy I bought it from said it was a 110 hp. What do you think?

[jmikulec]

What made the engines have more horsepower. What did they do to them that made them better?

[bbodie52]

T0602YR

T = Tonawanda, New York (GM Tonawanda Engine Plant)
http://media.gm.com/media/us/en/gm/comp ... wanda.html
0602 = Engine manufacturing date (month and date). June 2nd. If it is a 1964 engine (the presence of a harmonic balancer would be an indicator of a 164 CI engine, which was introduced in 1964), then the production date would have been 06/02/64.
YR

• 1962 150 hp, 145 CI, Manual Transmission, Turbocharged, Monza Spyder (Coupe or Convertible).
• 1963 150 hp, 145 CI, Manual Transmission, Turbocharged, Monza Spyder (Coupe or Convertible).
• 1964 150 hp, 164 CI, Manual Transmission, Turbocharged, Monza Spyder (Coupe or Convertible).

3856638

This cylinder head casting number is from a turbocharged 150 hp engine manufactured in 1964. It has an 8.00:1 compression ratio. The engine had the same horsepower rating at the 1962-63 turbocharged engines (150 hp), in spite of the increase in displacement from 145 CI to 164 CI. The total horsepower rating did not increase in 1964 primarily because the capacity of the carburetor and turbocharger was not increased along with the engine displacement. This increase in turbocharger capacity took place in 1965, along with a camshaft change, and the horsepower rating in 1965-66 increased to 180 hp.

Cylinder Head Specs.jpg (12.01 KiB) Viewed 1333 times

If your engine is actually a 1964 150 hp turbocharger base engine without the turbocharger (substituting a standard pair of carburetors) the horsepower output would be something between a 95 hp 164 CI engine with that 8.00:1 CR and the 110 hp engine with a 9.00:1 CR.

[jmikulec]

Ok so it's not true that they put bigger exhaust ports on the higher output engines. This is practically the same engine as any other. The only difference is carb and turbo capacities.

[azdave]

Ok so it's not true that they put bigger exhaust ports on the higher output engines. This is practically the same engine as any other. The only difference is carb and turbo capacities.

Dual-carb heads (140 HP 4-carb engines from 65-69 Vairs) did have larger valves from the factory than turbo or other single carb heads. These days Tom K. is modifying 110 heads so you'll also hear about "big valve 110 heads" but those are not original of course.

[cad-kid]

The 140 hp does have dual exhaust and the manifolds along with the pipes are larger (how much that REALLY helps I don't know). But it does sound good

[jmikulec]

So the 64 turbo would not have had dual exhaust from the factory? Just the 140hp had it?

[jmikulec]

So just to recap about my engine. It is 164 c.i. and puts out 150 hp with the turbo. the compression ration is lower for the turbo engine I have. It only has single exhaust. the distributor is different than a vacuum advance. What else am I missing.

[jmikulec]

also, if this really was a turbo wouldn't the exhaust be different even being single. wouldn't there be exhaust from the turbo going into it from somewhere. does anyone have pics.

[jmikulec]

I know that someone went through a lot to get this engine to be able to use carbs and actually look like carbs are supposed to go on it. they even changed the intake ports that the carb bolts onto.

[64powerglide]

Take a photo of your engine & post it.

[jmikulec]

It's all in pieces and I don't even have the exhaust . I am afraid that someone modified it and changed the crank or cam

[jmikulec]

I can't seem to find a code on my distributor. Did some distributors come without them.

[Trevor]

Jumping onto this thread rather than start a new one - I am trying to identify an engine for which the last two digits we expect to find are not there or cannot be found in the position expected.
The only number found is 18W115379

It is supposed to be a '68 Monza Coupe Auto

[azdave]

Jumping onto this thread rather than start a new one - I am trying to identify an engine for which the last two digits we expect to find are not there or cannot be found in the position expected.
The only number found is 18W115379

68 and 69 engines usually had the partial VIN number stamped into the case like I see in your photo. You should find the engine code there oo but it might be hidden. See this thread for two example photos and more details.

http://corvaircenter.com/phorum/read.ph ... 614,page=2