X-heads vs J-heads: what's the difference??

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X marks the spot.

$(KGrHqNHJBMFICpGV(B6BSC7yrH2ow~~60_35.JPG
 
A bigger valve is not going to be better sometimes. Remember, the bigger the intake valve the more it get shrouded. aka restriction. yes you can help that with a die grainder, BUT only up to the head gasket seating area, Then You Are Done!


Some one else said that a bigger valve will give more flow at lower lift. This is true. but if you have reversion problem(exhaust gas being push back up the intake during overlap). A bigger valve will magnify this problem. or start, a problem that you didn't have before!
 
I cannot believe this is 4 pages of argument about 40 year old junk that everybody already knows all the answers to.
 
A fool and his money are soon parted and there are always bullshite artists waiting to take advantage of that.
X J Q P L M D E blahhhhhhhh heads... The only people interested in this crap are antique dealers looking to perpetuate the "legend" cast numbers for profit or those with heads looking to hold on to some sort of legendary status for the next bench racing session...
Next thing you know, Rappers will be hanging " X" heads from gold chains around their necks... :)
 
Bakerlite said:
A fool and his money are soon parted and there are always bullshite artists waiting to take advantage of that.
X J Q P L M D E blahhhhhhhh heads... The only people interested in this crap are antique dealers looking to perpetuate the "legend" cast numbers for profit or those with heads looking to hold on to some sort of legendary status for the next bench racing session...
Next thing you know, Rappers will be hanging " X" heads from gold chains around their necks... :)
Click to expand...
They squirrel them away with their stash of ThermoQuads and Purple cams.http://www.sherv.net/cm/emoticons/****/crap-hitting-the-fan.gif
 
old mcdonald had a farm, N U X J Oooo...

All rappers tend to like an OZ
 
Code-Schmode,

Castings #_______Valve Size_____Code_________Year_________Engine

2531894 .............. 2.02" x 1.60" ........ 'X' ................. 1968 thru 1971 .... 340

3418915 .............. 1.88" x 1.60"......... 'J' 'Z' 'O' ........ 1970 thru 1972 .... 360

3418915 .............. 2.02" x 1.60" ........ 'O' 'U' ............ 1970................... 340 T/A

3418915 .............. 2.02" x 1.60" ........ 'J' .................. 1971 .................. 340

3418915 ............. 1.88" x 1.60" ..........'J' .................. 1972 .................. 340
 
66fs said:
Pay the Chevy Boys no mind...
Maybe they need to start their own thread: WhizBang VS Old Stuff
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66 FS,

Correct,

I find that most of the Critics here, drive Chevy Vega's and live
in the basement of their Mother's Summer Home........by themselves.
 
Bakerlite said:
A fool and his money are soon parted and there are always bullshite artists waiting to take advantage of that.
X J Q P L M D E blahhhhhhhh heads... The only people interested in this crap are antique dealers looking to perpetuate the "legend" cast numbers for profit or those with heads looking to hold on to some sort of legendary status for the next bench racing session...
Next thing you know, Rappers will be hanging " X" heads from gold chains around their necks... :)
Click to expand...

Or if someone was putting a car back to original and wanted a correct piece.

Some of the data is hysterical. A T/A head flows more cfm than a J head with the same valve... that's a riot. It's the same port! Somehow it magically flows a significantly greater amount of air? If only it was so easy.

None of them work better than the other in stock form when outfitted in similar fashion. You just won't see it. One has a nicer intake and has hampered with a garbage exh port, another is more balanced. That's what was stated earlier in this 4 page diarrhea-fest.

These are the best posts in the thread:
This message is hidden because 69 Cuda 440 is on your ignore list.
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What a space saver. More like Moparts every day around here.

I have to go out and work on my 78 Nova.
 
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