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Author Topic: which heads are better  (Read 2711 times)

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Offline y88rick

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which heads are better
« on: April 12, 2011, 06:37:34 AM »
i have a set of #51 heads and I also have a set of #17's either of this good and which is better to use?
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Offline kc79ta

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Re: which heads are better
« Reply #1 on: April 12, 2011, 08:44:12 AM »
My 455 had the 51 heads on it. The guy who did my rebuild said they are good if you plan on running a blower. They have large chambers 121cc I think. I went with 6x-8 heads.

Don't know much about the 17's.
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Keith

Offline Mr. P-Body

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Re: which heads are better
« Reply #2 on: April 12, 2011, 09:15:54 AM »


   17s are 350 heads, "small valve".

   What are you building?  If a "blown" 455, the 51s are okay AFTER they've had screw-in studs installed, and significant port work. Anything else, and they're  a "doorstop".

   The 17s would be suited to a high compression, low-speed build.

   Neither of these heads are very good for overall performance .

Jim
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Offline y88rick

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Re: which heads are better
« Reply #3 on: April 12, 2011, 05:26:07 PM »
nice so i need me a better set of heads as im not going to run a blower. i want something around 400 hp streetable and also able to go down the highway for 5 hours solid.
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Offline Mongo

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Re: which heads are better
« Reply #4 on: April 12, 2011, 09:21:12 PM »
I have a set of 6H heads but they are probably not much better then the ones you have. They were on the 455 when I got it.
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Offline y88rick

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Re: which heads are better
« Reply #5 on: April 13, 2011, 06:55:36 AM »
any takers they are going in this
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Offline Mr. P-Body

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Re: which heads are better
« Reply #6 on: April 13, 2011, 09:34:42 AM »


   What engine combo are you aiming at? 400? 455? Other?

Jim
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Offline y88rick

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Re: which heads are better
« Reply #7 on: April 13, 2011, 06:33:34 PM »
455 is the block i have its a 74 block or maybe a 75 (year 74 on the back by distributor) came with the #51 heads. I want the thing to be a beast but a reliable one. i am not sure if im going with a turbo 350, 400 200r4 or a 4 or 5 speed set up yet.
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Offline kc79ta

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Re: which heads are better
« Reply #8 on: April 13, 2011, 06:56:27 PM »
Sounds like the 455 I got. 74 with the 51 heads. My engine guy set me up with a set of 6x-8 heads for around 9.2:1 comp. and a XE262 Comp cam. I was told I should have gone with the XE268, but when I told the engine guy I wanted more of a cruiser then a racer he told me to stick with the 262 cam. He also said the the 262 cam will work better with Air Condition then the 268 (don't ask me Y), and the stock 4 speed.
Left the stock intake in, and still working on getting a carb. for it, so I can't tell you if it's a beast yet. Also got some RARE stock headers with a Pypes exhuast.
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Keith

Offline y88rick

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Re: which heads are better
« Reply #9 on: April 13, 2011, 07:03:47 PM »
sounds close or maybe exactly like what i want
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Offline Mongo

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Re: which heads are better
« Reply #10 on: April 13, 2011, 09:15:14 PM »
Quote from: kc79ta on April 13, 2011, 06:56:27 PM
Sounds like the 455 I got. 74 with the 51 heads. My engine guy set me up with a set of 6x-8 heads for around 9.2:1 comp. and a XE262 Comp cam. I was told I should have gone with the XE268, but when I told the engine guy I wanted more of a cruiser then a racer he told me to stick with the 262 cam. He also said the the 262 cam will work better with Air Condition then the 268 (don't ask me Y), and the stock 4 speed.
Left the stock intake in, and still working on getting a carb. for it, so I can't tell you if it's a beast yet. Also got some RARE stock headers with a Pypes exhuast.

That is almost my set up except I have the XE268H cam and 6X4 heads.
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Offline y88rick

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Re: which heads are better
« Reply #11 on: April 13, 2011, 09:43:33 PM »
looks like i should be searching for 6x heads?
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Offline Mongo

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Re: which heads are better
« Reply #12 on: April 13, 2011, 10:04:20 PM »
Probably be a good idea. The 6h's have a huge chamber like the 51's. Unless............you want to turbo it or put a blower on it then they are good.
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Offline kjkjkcjkcj

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Re: which heads are better
« Reply #13 on: April 13, 2011, 10:31:26 PM »
how bout throwin a turbo on the motor.  It would be different not many people throw a turbo on a 455.  might be for a reason but idk could be cool
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Offline y88rick

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Re: which heads are better
« Reply #14 on: April 13, 2011, 11:53:41 PM »
tell you what if you donate me one, i'll put one on lol
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