H head?

[mkmsam]

How can I tell if i have A H head.This is on the head 75 H under valve cover it's a 1970 GT I got in 1979

[kwilford]

Moderator Note: So far off-topic I couldn't stand it, so this gets its own thread

[hrcollinsjr]

Originally Posted by kwilford Moderator Note: So far off-topic I couldn't stand it, so this gets its own thread

Keith, take a deep breath it'll be

IIRC there should be an "H" stamped into the side of the head in the machined area next to the 3 bold side cover.

Harold

[jeff denton]

Mine is stamped 19H next to the side center cover. It has three bearings.

[tekenaar]

Originally Posted by jeff denton Mine is stamped 19H next to the side center cover. It has three bearings.

. . . that's exactly what the Rekord C "sprint" manual says, too . . .

. . . "Der Zylinderkopf ist eine Spezialausführung mit einem entsprechend der Verdichtung von 9,5 geänderten Volumen (48,8 cm³) der Brennkammern. Gekennzeichnet ist der Kopf, äuserlich sichtbar, linksseitig an der Anlagefläche des Knockenwellenmontagedeckels mit dem Schlagzeichen "19H" und zwei senkrechten halbrunden Wülsten an der Zylinderkopfstirnseite." . . .

- The cylinderhead is a special production unit with a "to 9.5CR" altered combustion chamber volume of 48.8cc (reduced). The head is identified, externally visible, on the left side machined area directly in front of the side "cam installation cover" with stamped letters "19H" and by two vertical half-round bars at the front of the head. -

The 19H cam is further identified by a rounded rib between the #2 and #3 exhaust valves lobes. HL engines - 1.9, 2.5, 2.8 - all also required special intake springs, marked yellow, PN 6 42 259 with these cams.

. . . there, in one place, all the specs for H heads on HL engines, first introduced in January 1968!

[GTJIM]

Originally Posted by mkmsam ... 75 H under valve cover ...

Markings cast into the head under the valve cover are Opel foundry identifiers for the casting where-as the '19H' is stamped on to the machined surface after the head has been finished.

What is stamped on the machined bit by the centre opening cover for cam access on the side of the head?

'75 H' may be the year/month casting identifier - 1975 August

[jeff denton]

The machined surface Jim refers to is directly forward of the center cam cover, directly above the #2 spark plug.
In looking the head over (when I first got it- thanks again OpelJim) I couldn't see anything about the combustion chamber that looked different from all the 19S heads I have. Didn't cc the chamber, though.
However after a .080" angle cut it sure looked different!
Ah, crap, did I just give away a racing secret? Dang. No, honest, Mr. Tech Man Who Doesn't Know a Sprocket Rectifier from a Tensioner Condensor, it's STOCK! That's just how they do it in Germany...

[75 wagon]

Well now I'm curious.
Mine is stamped with an 18A. I have a solid lifter head / motor out of an early GT (as I was told), in my 75 sportwagon. Do these #s indicate anything significant to anybody.

[RallyBob]

The only numbers that are of any significance are the numbers stamped into the flat next to the side cam cover identifying the head, the year cast into the head under the valve cover, and the Opel part # cast into the head under the valve cover. The rest are just for 'internal' use by GM and/or the foundry and don't identify anything we have to be concerned with!

Bob

[mkmsam]

Did not mean piss you off or upset you Mr wilford this is new to me.And thanks to all for Info.got all my parts from you bob@C&R back in 1986 big thanks to you. will try diffrent site

[kwilford]

Originally Posted by mkmsam Did not mean piss you off or upset you Mr wilford this is new to me.And thanks to all for Info.got all my parts from you bob@C&R back in 1986 big thanks to you. will try diffrent site

Um, I wasn't pissed off or upset at all
Really, I just move stuff around when I see posts or threads in the wrong place, and newbies ALWAYS get the benefit of at least a couple of misplaced threads before we launch the nukes , and your post was added to a thread that had nothing to do with your question, and wouldn't have attracted nearly as much attention as it did, so it got, and deserved, it's own thread. There, all in one breath....

[tomking]

Originally Posted by mkmsam Did not mean piss you off or upset you Mr wilford this is new to me.And thanks to all for Info.got all my parts from you bob@C&R back in 1986 big thanks to you. will try diffrent site

Dont sweat it, Keith is just doing his job as a moderator. And you will understand why down the road when you start trying to hunt for certain information contained in threads of certain topics.