Re: Questions about Cobra Jet 5.0
 

The engines in post #1 and #7 are not legal in Stock.

Ford never built any 5.0 Coyote engines for Stock Eliminator.....only part number paper combos.

Re: Questions about Cobra Jet 5.0
 

I've always wondered how these cooling systems can be deemed legal from a safety standpoint. That's the pressure cap on top of that degas bottle, and it will just puke out water around the edges of the cap if it needs to, there is no overflow whatsoever.

Re: Questions about Cobra Jet 5.0
 

Alan

Is the 302/325 that is listed in the 2012 Blueprint specs a Coyote motor or a Boss 302??(or are they the same??). We are thinking about building "something" and like the drunk in the liquor store, every thing looks so good, its hard to make a choice. seems the "paper" motors would be the cheapest and easiest, but the blown motors are so under rated that they sure look good on paper. I just need to win the lottery.

If anybody "knows" about the 302/325 I would sure appreciate any info.

Thanks RJ

Re: Questions about Cobra Jet 5.0
 

The engine in question is mostly a 2011 Mustang GT engine(Coyote), but it has 1MM more exhaust cam lift(a mistake in the specs maybe?) and the piston specs are rather vague, I can't tell if they are the same or not.

The Boss, AKA Roadrunner, has different heads, intake, and another 1MM more exhaust cam lift.

Re: Questions about Cobra Jet 5.0
 

It is kind of obvious by now that Ford submits specs that are different from production car stuff for a reason.
My guess is that they do that intentionally because they not want racers to use production car parts, but rather that they u$e their "Ford Racing" specialized part$.
Kind of a slick marketing move tho.

I still like the 2010 4.6L 3V CJ engine rated @ 232 hp.....what a ringer of an engine combo......LOL (CNC ported heads, large T.B., big cams, etc.) and "only" 232 hp ???

If I was going to build a naturally asperated CJ, that would be my choice.

Re: Questions about Cobra Jet 5.0
 

The 2012 Cobra Jet engine is very similar to the stock Mustang GT engine combination. The most notable difference is the pistons that add compression and the cams.

The intent of the Cobra Jet's with the 4.6L 3v and the 5.0L was to make it affordable for racers to build street cars into competitive NHRA Stockers. Even the 3v cylinder heads CNC ported are less money than getting a "valve job" on many vintage set of heads.

NHRA tech has told me that in general they will accept a replacement piston that is slightly less compression BUT that it must be submitted as an offical replacement piston. A racer or engine builder can submit a stock 5.0L or 3v piston, or an Aluminator piston as a replacement for the Cobra Jet piston and ask for it to be approved.

The 5.0L and 4.6L Cobra Jet models are a great bargain for building a Stocker, especially starting from a street car.

Re: Questions about Cobra Jet 5.0
 

What was the reason for making the changes to the pistons and cams? Why not just use the entire street motor if they are so similar?

Re: Questions about Cobra Jet 5.0
 

Andrew, I thought it would be obvious, to make things fairer for the rest of us.

Re: Questions about Cobra Jet 5.0
 

Is there a part number so I can buy the 5.0 Cobra Jet engine? How about the pistons? There must be some already approved piston available since there is a car out there running now, right?

How would I know what is a legal transmission? Normally this would be known based on what the cars were built with when new. Since none of these cars were actually built I have no way of knowing if two, three, four, five, six speeds are legal, auto or manual.

I have the car, I have 2 engines, it would be nice to know what I can do with them.

Re: Questions about Cobra Jet 5.0
 

Yeah, that's the ticket.