306 motors

[j93mustang13]

i dont get what the point is making a stock 302 into a 306. can someone please expain why you do this

 

[PrjctLxEnvy]

clean up the bores.

 

[NYthurobreds1320]

yeah most 302s have a ton of miles on them so you want to clean them up and start fresh for new pistons and rings

 

[j93mustang13]

o so thats all that it is.

 

[jrmandryck]

Well that and it will give you a tiny bit more hp.. You just have to think it a 302 is making say 302 horsepower at the crank (that's 1 hp per cubic inch) the same exact set up on a 306 is 306 hp. Not a really good reason to add cubes but like they said its the only way to clean the bores up really...

 

[EHA Racing]

Class requirements for 306ci maximum, clean up bores, limited funds, easy to build as there is no stroker clearance issues, still make decent hp, no re-balancing because you can usually find .03" over pistons with the same gram weight as stock pistons, adding forged pistons to get rid of the old cast pieces of crap, raising compression for more power, lowering compression for more boost. There are many reasons that's why there are so many 306" engines out there.

 

[JR4 Motorsports]

I got to ask one thing, when did a "30 over 302" become a "306" i know math wise it is, but when did the terminology change?

 

[Chevy_Guy]

Why would it ever have been called something it never was to begin with?

 

[AdirondackFox08]

I got to ask one thing, when did a "30 over 302" become a "306" i know math wise it is, but when did the terminology change?

I have no idea, have been hearing it for a while though...

Why would it ever have been called something it never was to begin with?

Haha, yeah because its a 4.9, but they rounded up to the 5.0.. 5.0 sounds better I suppose, I think I did see an explanation of it at some time, don't remember what it was though...

 

[Chevy_Guy]

We all know who had the real 5.0.

 

[AdirondackFox08]

Yes... but didn't do very well in that car. That's why they needed the 350... Too bad ford didn't put a 351 in the mustang, would've been a nice ride...