Is this a v6 Turbo ZR-1 Prototype Engine? Friend purchased it (pics) ---

[icarus-54]

Thats why it caught my eye,it was the first 4.3 I saw with splayed valve heads.I talked to the owner,he said that they changed it from even fire to odd fire by changing the crank,ignition and electronics.When I heard it go by it was turning some awesome rpm.Way more than an even fire is capable of.If you think an even fire 4.3 runs ruff,an odd fire idles like a washer machine with one leg missing.

[Tripler]

Perhaps a prototype mid engine for a mid engine corvette ???

[Hib Halverson]

I know this is an ages old thread and I know I've posted to it before but I just noted a small detail in those images.

There is a part dated "MY87".

That rules that engine out as having any association with any Corvette development program that is pre-ZR-1. By 1987 the ZR-1 development was way, way past considering any other engine.

[LGAFF]

Reeves Callaway would know what engine this is...Callaway had a pic on their facebook page

https://www.facebook.com/25478154717...type=1&theater

[LGAFF]

The story is posted there also...

[LGAFF]

Looks like the V6 TTs were abandoned after they did not meet the cut on HP...same output of NA V8s

[J-Bonez]

It maybe the engine they put in the transam....v-6 turbo i believe it was late 80's

[BigIke]

So cool! Looks like they married a big block head to the 4.3 v6! That's awesome

[Hib Halverson]

Originally Posted by BigIke

So cool! Looks like they married a big block head to the 4.3 v6! That's awesome

It's not a BBC head "married" to the 4.3.

The splay-valve V6-90 head was a clean-sheet-of-paper, racing part, released back in the '88-'90 period for the V6-90, which, back then, was popular in a number of racing series. While it mimicked the Big-Block's splay-valve layout, it departed from the BBC design in that the valve configuration was equally-spaced (E-I-E-I-E-I) whereas the BBC (and the Gen 1-2 SBC) were E-I-I-E-E-I-I-E and the production 4.3 was (E-I-E-I-I-E).

I noted that the image of the top of the head with the rocker cover off also showed a CN with an "X" in it which means the part was "experimental". That's a clue that the heads were a development piece at the time the images of the engine in a C4 were taken. Later examples of that head, i.e.: parts off production tooling, have only the PN and not the CN with the "X".

There were several versions of that head, apparently, because I've seen them with PN 10134384, as well as, PN 14044841 shown in the imagery in this thread.

[mgbrv8]

Cool stuff Nathan

Dave