Oldsman71

I got a 66 425 years ago and it was supposely out of a 66 delmont police car. It has the B heads and it is a 39deg bank. Now the question is anyone now any specs on the motor that was in the police cars? Also where the VIN number is stamped on the block it just has a center punch mark. What does this mean?

66ninetyeightls

Could mean it was a replacement block

2blu442

In 1966 they didn't stamp the vin the same as they did in 1968 and newer engines. They didn't stamp a vin at all, but did stamp one of the heads on the end (I think the pass side) with an application number. Check this thread, down near the bottom I have some pictures of the stamp in the heads.

https://classicoldsmobile.com/forums...s-engines.html

It would be cool to know if the police car engines had a specific code stamped in them. I believe the board member "aliensatemybuick" may have information on the Oldsmobile police cars of that vintage. John

aliensatemybuick

Well, there was no "Delmont" model in 1966; that model started in 1967. In 1966 (as in 1965), I believe the police motor was basically the Starfire engine with hotter spark plugs and a unique air cleaner decal. I would BET that a '66 police apprehender engine would be a 45 degree block. If its truly a 39 degree 425 with B heads, maybe its a Toro motor? If so, I think the stamped head code should have an "N" prefix and "T" suffix (i.e., NxxxxxxT)


Kurt / wmachine may be able to provide the proper head prefix-suffix for police equipped cars; I think I used to have this info, but can't find it any longer. Pretty sure a '66 Starfire engine would have an "N" prefix and an "S" suffix (i.e., NxxxxxxS) on the stamped head number, not sure the police cars would be the same.

On a related note:



I'd surely love to find a set of those hubcaps..never even SEEN a set in person.

Oldsman71

after looking at it closer not sure if 39deg but does have the larger lifters

Just to show proof and let everyone else tell me what it is here.

ent72olds

Yes...you are correct....

copper128

Looks like a 39* block to me.

Here's my 45* 425. Notice how thick the lifter bosses are on the valley side.

aliensatemybuick

Supposedly this is how you can tell between a 39 and 45 degree motor:



If true, comparison to the pics you uploaded suggests that yours is a 39 degree motor. I've been JUST a bit skeptical of this photo, since I still wonder if the lifter bore size is an additional complication. Some jackhole on this site last year posted that info, along with the following photo of his engine, which he said was 39 degree AND with the common (i.e. 0.842" lifters):

https://classicoldsmobile.com/forums...3&d=1248154789

It looks very much like your engine, yet you said you have the larger (0.921") lifters?!

Based on the top of the pistons, I'd say your was a "high-comp" motor.

SO...if you are sure that its got the big lifters, and it is as suspected a 39 degree block, I am inclined to think that its a Toronado engine with the wrong heads on it.

Just my 0.02.

Warhead

If it has .921" lifters, it would be a 39 degree block.
Does it have the drill spot on the rib next to the oil filler?
Jim

Oldsman71

i just mic'd the lifters and they are .8423" and it does not have the spot drill on the rib.

I am wondering if the P means police or something else on the head.

Also something i have heard for years if it is a 45deg block your intake choices are limited because 455 intake will not fit is this true or more of same old wise tell crap over the years.

aliensatemybuick

I suspected those were not the large lifters, they looked SKINNY! So with that confirmed, I believe yours is a non-toro 1967 block. I couldn't make out the casting number on the head...are you sure its not a "C"? The "P" definatley does not mean police, but I think it does indicate a high comp engine (which the pistons also support).

If it is indeed a "B" head, then I still say it is not original to the block, and likely had to have the pushrod holes reamed out to work with your motor.

The 39 vs 45 degree business had no impact on intake manifolds.

copper128

They're definitely B heads Scott. The engine # starts with a P.
That .842 lifter, 39* business runs counter to what I've learned about '66 425's, too.

geckonz08

If its truly a 39 degree 425 with B heads, maybe its a Toro motor? If so, I think the stamped head code should have an "N" prefix and "T" suffix (i.e., NxxxxxxT)




just checked my toro --66 motor .It has the thinner lifter bosses and sure enough ,as above , the N prefix and T suffix and the 2 numbers after N are 66

Texas Jim

Just a comment, not info.
In any event, no matter what engine you have, IMO, you have a really neat one. Seems to me that people are looking f/ something different these days, which is the reason I went w/ the 455 Olds. Even the older "nail heads" are popular again. And ofcourse that high compression 425 is a strong running engine. If I were you, I'd be doing the same thing, trying to find out "exactly" what the details of that engine are. Good Luck w/ the research and the "too cool" 425.