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#1
08-04-2011, 12:50 PM
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6x heads
I have a line on a set of 6x heads for relatively cheap that came off a running 400, are they worth picking up for $100? I don't have a use for them right now, but my understanding is these are good heads. Thanks
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#2
08-04-2011, 01:10 PM
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Yes worth the $100 do you know if they are 6X4 or 8s the for have smaller ccs than the 8s but the 8s are still a good head too.
__________________
Conrad 79 Trans AM 406 #12 heads Torker II intake Crower 60210 750 holley vac. sec. T400 3500 Stall 3:73:1 rear.  ECMTTFMFers. IHTTFMFers.
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#3
08-04-2011, 01:52 PM
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They have the smaller cc's.
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#4
08-04-2011, 02:18 PM
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Decent price, I'd buy 'em.
Jim
__________________
65 Catalina sedan. Allen Thomas Performance 495. KRE Heads at 310cfm ported by SD Performance, ProSystems Dominator carb on ported Victor intake, P-Dude custom grind hydraulic roller, MSD ignition, 3.50 Moser/Ford rear. F-Glass front bumper by son Rob, rear by the old man and joint effort for trunk lid. 3950# w/driver. Best of 9.5761/139 on 175 shot, 6.01 /114 in 1/8. |
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#5
08-04-2011, 02:33 PM
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I paid $300 for mine so I would say that's a pretty good deal.
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#6
08-04-2011, 02:53 PM
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YES ! All big Catalina's need a 455 and 6x heads at some point in their history
 Then Aluminum heads later.
__________________
63 Catalina coupe 467 cid budget drag car low 11's 1/4 , 7.0's 1/8th pump gas n/a 66 Star Chief Executive 59k mile 389 67 IH Scout project 2WD "Indian Scout" 69 Le Mans 2 dr HT 350 91k mile 15 sec 1/4 69 Firebird 400 Burgandy/Black 70 Olds Rallye 350 F85 4 speed 3.91's 70 Olds Cutlass Cruiser Red Wagon 350 108k miles 15 sec 1/4 12 sec w 455 74 Cheyenne Super C10 LWB Gen 6 454 w ZZ502 cam 3.07gear 13.1 1/4, 8.3 1/8 2020 RAM 1500 SLT 4x4 5.7 A8 Hemi 2008 Saab 9-3 2.0T convertible |
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#7
08-04-2011, 03:18 PM
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6x heads
will the heads be at norwalk for the races? I would be interested in picking up them if so
thanks george 4403210500 |
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#8
08-04-2011, 03:31 PM
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I don't want to start a "you can't run above 9.x on pump gas" argument. But in general, if you happen to be looking in the high 8 to low 9:1 compression ratio, the 4's (with proper milling to dial them in) are good for a 400 and the 8's are good for a 455.
__________________
469 (455 + .060") with the Edelbrock RAIV cam, Ported 6X-8 heads with 1.77" exhaust valves, 100 cc's, "0" decked block for 9.3:1 static CR, Eagle 1.65:1 roller rockers, Edelbrock RPM manifold and Edelbrock 750 carb., 1.75" x 3.0" Hedman Headers, 2.5" flowmaster exhaust system with "H" pipe and Dynamax super turbo mufflers. 200-4R with a Continental converter, 3.07:1 12 Bolt Saf-T-Trac 
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#9
08-04-2011, 04:36 PM
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I'm heading out to look at the heads right now, where on the heads will it say if they are 6x4 or 8?
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#10
08-04-2011, 04:43 PM
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Quote:
There's too much good info. on how to build a 10:1 iron head engine, around. Not easy, lots of details. You only live once...
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... 
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#11
08-04-2011, 04:45 PM
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Quote:
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#12
08-04-2011, 05:40 PM
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They were the #8s. I picked them up, I figure they may come in handy down the road. Thanks for the info everybody.
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#13
08-04-2011, 09:39 PM
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You made a good buy.
Jim
__________________
65 Catalina sedan. Allen Thomas Performance 495. KRE Heads at 310cfm ported by SD Performance, ProSystems Dominator carb on ported Victor intake, P-Dude custom grind hydraulic roller, MSD ignition, 3.50 Moser/Ford rear. F-Glass front bumper by son Rob, rear by the old man and joint effort for trunk lid. 3950# w/driver. Best of 9.5761/139 on 175 shot, 6.01 /114 in 1/8. |
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#14
08-04-2011, 11:16 PM
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Should I not plan on putting the #8 heads on a 400? I have read that they came on the 400 originally?
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#15
08-05-2011, 07:06 AM
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Those heads will below compression around 8:1 I think. Good for 87 octane
__________________
Conrad 79 Trans AM 406 #12 heads Torker II intake Crower 60210 750 holley vac. sec. T400 3500 Stall 3:73:1 rear. ECMTTFMFers. IHTTFMFers.
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#16
08-05-2011, 05:39 PM
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As Conrad says, LOW compression, at least for a "performance" application. They'd be good on a "milieage" engine or a "torque" engine not intended for revs and where 87 octane is desired (truck). -8s are "ideal" for a 461 (400 with a 4.25" stroke..). -4s with a bunch milled off, are better for the 400. It has recently been "reported" of chronic head gasket issues with a pair of -8s milled "too far" (.075", and we stay with .060" MAX), on a 400.
Good buy! Jim |
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