found some X heads

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DusterBoy15

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i found some X heads for around 300 over on another mopar site... im thinking of getting these becasue they out flow the current heads i have and should give more performance then the ones i have off the 76 motor right? and should be even better for porting the ports and the bowls
 
No. Head Type Intake Exhaust
0.05 0.10 0.20 0.30 0.40 0.50 0.60 0.05 0.10 0.20 0.30 0.40 0.50 0.60
2 915J Fully Ported, 2.02" Valves N/A 62 130 186 239 272 277 N/A 52 101 132 166 173 178
4 Edelbrock Mildly Ported N/A 72 135 191 233 260 260 N/A 69 113 142 164 176 183
7 Edelbrock N/A 72 126 179 224 239 242 N/A 66 110 139 158 170 176
8 051 Fully Ported, 2.02" Valves 40 77 137 186 225 228 224 27 52 104 140 159 168 175
9 894 Stock 340X 32 58 125 172 208 221 210 22 45 95 122 135 140 142
10 915J Stock N/A 66 123 170 206 220 216 N/A 63 110 135 145 148 148
13 596 Stock 27 53 107 159 185 199 193 22 48 89 114 121 123 124
14 051 Stock 30 50 113 165 188 193 189 23 49 97 123 133 137 137

16 587 Stock 27 52 107 162 195 191 192 22 46 87 112 121 124 126


from what i see here the j and x alsmot flow the same stock.
and a fully ported 76 head cant touch a fully ported J head and the X head out flows my stock 76 head
 
Whats the cfm on the 308s. I would probably just run those and port them myself before dropping $300 on another set. They really aren't that much better than regular 340/360 heads. just my 2cents
 
The X and J are the same head. The difference in flow numbers is nothing and the same difference's can be found from head to head of the same casting number/letter.

As shown, the Edel. heads flow like preped stock J or X heads or like a mild port work on lesser heads. This has been know and documented before that the Edel. heads flow like this. They do very well on the high end for as cast part. Preped well, before useage, they'll work best without a partial or full porting expense.
 
On what engine and how is it built?
In addition to what tranny, stall, rear gear and tire height with cars weight.
 
Over 308's? I wouldn't spend money on those heads. Unless you did a step up to W2, Edelbrocks, Magnum etc...340/360 heads are too close flow wise to really justify spending $300 on them, if you already have 308's.
 
I DONT HAVE 308s!!! hahaha sorry

the motor is the xe274 cam and 3000 plus stall 3.90 gears 904 tranny 27-28in tire about 3000pound car give or take 150 pounds
 
Yea, I'd use the X head. I'd also bowl port it if I could before bolting it on.
(If money allows.)
 
How does hardened seats make it run better?
 
well i thought hadened seats was so that i can run unleaded fuel....why else would people put money into hadened seats
 
LOL, OK, the leaded gas;

Lead was introduced into the gas because when the fuel exploded, there was a fine mist of lead left behind that coated the seat area. This now coated area cushioned the exhaust valve as it closed on the seat. Lead also ups the octane level.

Putting seats (Hardened) into a head is to ;

Save the head, extened it's life.

Keep it numbers matching.

Save the head from the valve sinking into the head. That would ruin performance and have the cam seem smaller since the valve is sunk in the head. The same lift @ the cam would not be so at the valve.

If the head is ported allready, this will save a ton-o-money.

Some people want the older head for possible race class, restored class, or just want to work what they have. The hardened seat keeps the head working.
 
The valve will eventually sink and damage will, sooner or later occur. It may be along time in comming, but....
 
Actually, the seats are soft, the valve is hard.
The exhaust seat is the same as the intake but takes the abuse due to the hotter exhaust gass's leaving the chamber
 
Your choice. If they need it, do it. They'll make the head last longer. Ya gotta want the head IMO to do this.
 
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