![Push rod vs overhead cam](https://kumkoniak.com/33.jpg)
![push rod vs overhead cam push rod vs overhead cam](https://cimg1.ibsrv.net/cimg/www.ls1tech.com/1600x900_85-1/957/Slide-1-229957.jpg)
Likewise how about in CART/USAC? I notice that Indy racing was long dominated by the DOHC Offenhauser engine just as Formula One was (later) dominated by the DOHC Cosworth DFV engine.
![push rod vs overhead cam push rod vs overhead cam](https://www.samarins.com/glossary/img/sohc-engine-components.jpg)
Is the Mercedes-Illmor 500I 1.8 bar turbocharged 16-valve 3.43L V8 (supposedly 1024 bhp max 10,500rpm) the last modern purpose-built racing engine with a pushrod design (aside from production-derived racing engines like the Ford Windsor BOSS, Chevrolet small-block and so-on including the purpose-built Toyota NASCAR engine made to similar specifications)? Or are there others? Given this, what is the feasibility of a pushrod engine in Formula One? When was the last pushrod engine in Formula One (60's? or was it earlier or later than that, I have no idea)? That they are physically more compact, simpler, lighter (though crucially not the valve-train reciprocating mass): they say they "just work" and are pretty much all-round great! Pushrod/OHV/cam-in-block advocates are always pushing the advantages of pushrod engines.
![Push rod vs overhead cam](https://kumkoniak.com/33.jpg)