GM Releases 2013 bogus HP ratings at PRI show

[Ken Miele]

Charley,

I think I will stay out of this one, you seem to be doing just fine without my help. The changing of the guard is not always easy or pretty.

All I can says is, I'm building a new engine for Shelby, and when its done I will be racing in CC. I have had a few heads up races and got my butt kicked, but for the most part I'm still competitive and still having fun. Being involved in two new cars and having my old car tells me we can all live together. These cars are here to stay for better or worse, and so am I.

I do respect everyone's opinion, but I hate to see things get so ugly. A little respect goes a long way towards each other, but I can't force members to show respect, I can only suggest it.

Andrew, the 352 has some great parts, but CNC’D Heads are not one of them.

[Andrew Hill]

Originally Posted by Ken Miele

Andrew, the 352 has some great parts, but CNC’D Heads are not one of them.

This head is the part number listed in the engine blueprint guide
M-6049-Z304DA

http://www.roushyatesparts.com/ford-...049-z304da.htm

it talks about CNC porting at the bottom, so the accepted head is the non-CNC'd version?

[Ken Miele]

Correct Andrew, when the engine was submitted to NHRA it did list the cnc head, but NHRA said no.The 352 and 428 along with the new 363 and 427 all use the non cnc heads.

[Comp 798]

M-6049-Z304DA - 63cc CNC'd combustion chamber. NHRA allows 56cc

[Greg Hill]

Originally Posted by Andrew Hill

This head is the part number listed in the engine blueprint guide
M-6049-Z304DA

http://www.roushyatesparts.com/ford-...049-z304da.htm

it talks about CNC porting at the bottom, so the accepted head is the non-CNC'd version?

There's something screwy in this head deal because Roush says the heads have runner volumes of 204 and 85 as cast and the spec in the engine blueprint section says 230 and 91. Wonder where those extra cc's came from?

[Comp 798]

M-6049-Z304P - The ported head.

[Andrew Hill]

Here's all 3 listed with flow numbers
http://www.thefordsource.com/store/p...-6049-Z304.pdf

"Intake port volume as cast: 204 cc"
"Exhaust port volume as cast 85 cc"

In the Stock/Super Stock Cylinder Heads Volume list, both Z304D and Z304DA are listed with:
Intake CC's Max: 230
Exhaust CC's Max: 91

All have CNC'd combustion chambers, M-6049-Z304P has CNC ports as well.

Also, the engine blueprint guide has a 56 cc combustion chamber, while a 63 cc one is listed in the specs. What's the deal with that?

How can I go about getting an extra 26 cc's on the intake and 6 on the exhaust approved?

[Andrew Hill]

Originally Posted by Andrew Hill

Here's all 3 listed with flow numbers
http://www.thefordsource.com/store/p...-6049-Z304.pdf

"Intake port volume as cast: 204 cc"
"Exhaust port volume as cast 85 cc"

In the Stock/Super Stock Cylinder Heads Volume list, both Z304D and Z304DA are listed with:
Intake CC's Max: 230
Exhaust CC's Max: 91

All have CNC'd combustion chambers, M-6049-Z304P has CNC ports as well.

Also, the engine blueprint guide has a 56 cc combustion chamber, while a 63 cc one is listed in the specs. What's the deal with that?

How can I go about getting an extra 26 cc's on the intake and 6 on the exhaust approved?

So does anyone have any answers for this? Where did the extra cc's come from if they're not ported?

[art leong]

Originally Posted by Andrew Hill

So does anyone have any answers for this? Where did the extra cc's come from if they're not ported?

The same place they come from on all the other "stocker" heads?