Looking for X Head Picture

[furrystump]

Mine, X’s by Dwayne. PRH

 

[Earlie A]

Here's one of my 587 ports. 11/32 Hughes 2.02 valve.

 

[TT5.9mag]

Mine, X’s by Dwayne. PRH

View attachment 1716446963

Here's one of my 587 ports. 11/32 Hughes 2.02 valve.

View attachment 1716446966

Strikingly similar

 

[NC Engine Builder]

I see none of these make the famous "200 cfm by .300 lift" that our old friend PBR allways preached about.

 

[Earlie A]

I see none of these make the famous "200 cfm by .300 lift" that our old friend PBR allways preached about.

You are correct. I have not gotten there on an iron head with a 2.02 valve. IIRC @MOPAROFFICIAL was over 200 on one of his heads and @PRH hit 196 with his T/A head earlier in this thread.

It's a whole lot easier with an aluminum head and a 2.08 valve.

 

[PRH]

200 by .300 from a 2.02 valve is pretty rare for me….from any head.

This was touched on earlier…….
When you start laying back the SSR to help diminish the high lift instability, you can often lose some lower/mid-lift flow.

 

[gzig5]

I don't think that PBR was messing with old stocker cast iron X/J heads very much so that 200 by .300" number was being applied to his old W2's that he complained about, and the Ede/SM/PM/TF aluminum heads.

 

[MOPAROFFICIAL]

My J heads are not done like your average J head. Yes 204cfm @.300 lift

 

[MOPAROFFICIAL]

They were a bit on the detailed side

 

[Scampin]

What's the numbers you got?

 

[MOPAROFFICIAL]

What's the numbers you got?

The for sure exact #s ill have to dig for.
They changed as they progressed through that thread., even then those #'s nice.

 

[MOPAROFFICIAL]

Sb Head Flow Numbers

 

[crackedback]

I see none of these make the famous "200 cfm by .300 lift" that our old friend PBR allways preached about.

They do with the spark plug out or loose!

 

[MOPAROFFICIAL]

270's-280's int 180's-190's exh

Here are mine [j's] that I'm running on a 410 right now.
2.02-1.60 11/32 undercut at the stem and back cut, exhaust valve are ferrea.

.100 75 52
.200 142 101
.300 200 141
.400 249 169
.500 278 180
.530 281 184
.600 248 187

I used a harbor freight grinder w/ 3 different shaped '3 1/4'' long shank' carbide bits, and rolls to do a lil polishing.

 

[MOPAROFFICIAL]

They have thick hard seats on the intakes.
Did most of the work pre guide and valve job

 

[MOPAROFFICIAL]

They do with the spark plug out or loose!

You'll know it right away when you're .100 numbers are in the 90s LOL

 

[fishmens67]

Sb Head Flow Numbers

Whatever happen to that wild and crazy guy.

 

[Scampin]

Good low lift but drop like a rock at higher lifts. Always a trade off.

 

[MOPAROFFICIAL]

Whatever happen to that wild and crazy guy.

He calmed down some, learned more, and became official

 

[TT5.9mag]

He calmed down some, learned more, and became an official

 

[MOPAROFFICIAL]

Good low lift but drop like a rock at higher lifts. Always a trade off.

Thats right.
Stock limitations cant hide.
Believe it or not, I didnt push these to the max.. I stopped when I hit those big mid lift numbers and just dialed the cam to exploit them. Cam for the heads and rpm. **** was so good I didnt want to trade off fat mid #'s for higger lift flow. One of the ports actually touched 290... hmm 284.. 6 cfm.. 290.. ahhh... while i was working on them.. musta been when the bench uncalibtrated itself...
I was still very green then. The goal at the time was to get the port volume up for the 4" arm net around 270 CFM like the RHS HEADS that were the rave back then.

 

[PRH]

They do with the spark plug out or loose!

I was having this conversation with someone a few weeks ago.
They were giving me the flow numbers on some heads he was having done and at each lift point, after he’d tell me the number……. I’d say “nope”.
He’s like, what do you mean?
I said they’ll never flow that…… there’s a leak.

A couple days later I get another call…….. they found the leak.
No spark plug.

 

[Scampin]

Since we are side railing this thread anyways I will add KG Engines in Kansas, Ohio has a CNC program for J's and X's that advertises 280ish cfm intake flow and after some finishing touches from PRH do not disappoint. Reasonably priced also. Their small block and big block ports have records in the F.A.S.T. class.

 

[MOPAROFFICIAL]

Since we are side railing this thread anyways I will add KG Engines in Kansas, Ohio has a CNC program for J's and X's that advertises 280ish cfm intake flow and after some finishing touches from PRH do not disappoint. Reasonably priced also. There small block and big block ports have records in the F.A.S.T. class.

I spoke with that guy on the phone one time years ago

 

[PRH]

Since we are side railing this thread anyways I will add KG Engines in Kansas, Ohio has a CNC program for J's and X's that advertises 280ish cfm intake flow and after some finishing touches from PRH do not disappoint. Reasonably priced also. There small block and big block ports have records in the F.A.S.T. class.

The first set of BBM heads I had in the shop from there(they did the porting, I did the seat & guide work)……. After I flow tested them, I thought to myself………..”I guess I won’t be doing any high effort porting on those anymore”.

The same holds true for the factory sbm iron too.