[Blowd]

I would figure it had the same bore spacing(4.4) as a SBC , nova 4, or chevy six? I have read the chevy 6 is the same as the SBC, and since the nova 4 and iron duke were based on this I figured it would be the same.

Geez I'm busted, typed it into the calculator wrong (oh and I was looking at the lifter cover bolts not the cylinder C/L on my drawing). Yea more like 4.40 on the SD4, the Tech 4 actually had some shorter blocks for specific applications.
Why did I even bring this up..

[JOE DEYTON]

Thats cool, no big deal.

[Blowd]

Welcome to PY Indy! By way of introduction to the other members, Indy is doing a Turbocharged Superduty build ( thread over at Pennock's ) and has one of these rare Cosworth heads he's incorporating into it. Lot's of interesting custom design and fab work.

Sorry for the late welcome, I've been kinda busy last couple of weeks. Was out at the track last weekend and down in Galveston for the APA show weekend before. I mocked up the SD and hauled it down there in the parts chaser for the Pontiac guys to look at. Even picked up a trophy for the ole truck.

[Tom Vaught]

I have seen Petersen's tech make other similar assumptions and be wrong there too.

Tom V.

[Tim john]

Brings back memories. I had a NOS 4cyl SD cylinder head as well, all valves, everything and offered it for sale here on the forum years ago. I took it to Norwalk and a guy from an hour away from our home ended up buying it. A quick search should bring up the moth balled thread. I ended up delivering it to a guy in Sanford, Michigan. He had a 50+ Fiero collection and needed this SD head to complete his Indy 500 Pace car.

Tim john---

[Half-Inch Stud]

Soooo, suffer the intakes, can those Cosworth SD4 Heads bolt onto a 455?

[Blowd]

Originally Posted by Half-Inch Stud

Soooo, suffer the intakes, can those Cosworth SD4 Heads bolt onto a 455?

LOL Aardema stuck a pair on a SBC, so why not. Just a matter of reversing one head, engineering a drive, and fabricating a bazillion parts....

Surprised this thread surfaced again, I know 13yrs is probably not a record here , but a personal best for me.:

[unruhjonny]

I realize that this is a recently bumped thirteen year old thread, but that was so cool!!

I don't think I saw this discussion before.

I have magazine articles with a 1989(?) Grand Am based GTO concept car;
Mind you, back then the Grand Am was a cool car - about the size of a Sunbird, but much sportier.

I would have loved to find a nice 1989-1991 Grand Am with a five spped and the iron duke to swap SD-4 parts on to - but post 1988 2.5/5 speed Grand Am's alone were rare (even twenty years ago), so I ended up essentially buying, and fiddling with the production version of that GTO concept car;
A Quad4/5 speed Grand Am.

Interestingly, the last incarnation of the 442 was a 1990-1991 Quad4HO powered Calais - the Oldsmobile version of the Grand Am;
The production 1990-1991 442 was done absolutely like the 1989 GTO prototype.

1990 Calais 442 (full proper name: Cutlass Calais Quad442)

(please note, those are non-production wheels, the 1990 442 came with five spoke 14" wheels)


1990 Grand Am SE



The interiors were also light years apart.

All of this aside, a DOHC Super Dtuy "Iron Duke" is still something I'd love to do one day - but with the absurd rarity of the SD-4 parts, I'm pretty sure it will never happen.

[jerry455]

When the dam broke in Sanford MI. a few years ago, the area where that Fiero collector lived was flooded. I remember reading about the losses. It was a shame. I am not sure all that was lost but it was a lot.

[VCho455]

Goes well with this.

https://bringatrailer.com/listing/19...tiac-fiero-18/

[turbo69bird]

I haven’t read this whole
Thread but a guy I know set some records w one of those at E town. He also had some pretty fast traditional Pontiacs back in the day. Those are amazing engines