Dunno if you guys have ever heard of these things or not but i figured it is GM and also a huge part of GM'* preformance history.
Below is pictured a 2.7 and a 3.0 Pontiac SD4 4 cylinder engine while it is a very fragile motor they create insane amounts of horsepower for there time and even in todays standards. the 2.7 was the 1st generation of the SD4 putting out about 188-200HP this was the engine that was in the Dole IMSA GTU car (the car my 84 IMSA was promoting and my IMSA originally came with one) Also the Dole team Fiero car drivin by clay young was also the 1st american car ever to win the IMSA GTU series back in 84-85.

Over the years the engine evolved into the 3.0. it looked a lot like the 2.7 but putting out a total of 300HP N/A To my knowledge it was never used in any of the IMSA cars directley but was sold as an over the counter engine from pontiac but never offered as a option.
Soon after came the cosworth pontiac DOHC SD4 with an N/A setup it was putting out about 500HP there were not may of these motors made .



2.7 SD4 the 3.0 also looked like this



And this was the cosworth/pontiac DOHC.

A nice bit of history, thanks for sharing.

Great Read... thanks bud for not letting me forget that slice of history!

On my Dodge Forum, we have guy'* breaking 10'* with turbo'd 4'*. Do these get turbo'd much?

I've never seen one tubroed. But i dont think it would hold up well under boost There a very fraigle motor and when used for street (which is not exactly legal) there only good to about 20K miles before they start to go bad. Not to mention the 2.7 is a $10K motor now. there still made just not by GM.

that cosworth engine is like nascar territory liter per hp wise. sounds like a fun grenade.