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 Ram Air III cam in 455
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Daywalker461
Tribal Scout

USA
5 Posts

Posted - 28 May 2017 :  11:10:46 AM  Show Profile  Reply with Quote
My builder wants to put the 068 or similar grind Cam/Ram Air III cam in my 455. Its a street application, TKO 5 speed and aluminum E heads. Everything I read is RAIV with rhodes lifters. I have seen a few of the 068 combinations and was wondering if everyone was happy with it.

Steve C.
Crazy Horse

1675 Posts

Posted - 28 May 2017 :  11:42:16 AM  Show Profile  Reply with Quote
What is the anticipated static compression ratio going to be ?

The aftermarket heads sure could take advantage of more valve lift than a old design cam like the 068 !

If you want a tiny cam then at least step up with shorter seat timing and additional valve lift....

http://www.lunatipower.com/Product.aspx?id=1774&gid=287


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Edited by - Steve C. on 28 May 2017 11:48:22 AM
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Daywalker461
Tribal Scout

USA
5 Posts

Posted - 28 May 2017 :  11:51:12 AM  Show Profile  Reply with Quote
Running a dished piston for 10:1 The heads are 72 CC. Picked them up for $500 from an older guy who threw a rod.

quote:
Originally posted by Steve C.

What is the anticipated static compression ratio going to be ?

The aftermarket heads sure could take advantage of more valve lift than a old design cam like the 068 !

If you want a tiny cam then at least step up with shorter seat timing and additional valve lift....

http://www.lunatipower.com/Product.aspx?id=1774&gid=287


.

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Steve C.
Crazy Horse

1675 Posts

Posted - 28 May 2017 :  11:57:19 AM  Show Profile  Reply with Quote
Here is a hint.....

"A very good choice for 455 cid at 9.6 to 1 is the Summit 2802 camshaft, or the Crower 60243. Both of those are very "tame" in a 455 with that much compression, cranking pressure will be under 170psi, and it will help the engine manage a steady diet of pump gas with normal timing/fuel curves."
Cliff Ruggles

Note comment very tame ! And I presume Cliff had iron heads in mind with the comment, thus the lower compression ratio mentioned.

Further the wide lobe separation of the 068 cam will reduce maximum cylinder pressure and decrease cranking compression. And further it will raise the torque to a higher RPM.
A 110-112 lobe separation would be a better choice in my opinion.

My opinion this would be a better choice than a Crower 60243 with your compression....

http://www.lunatipower.com/Product.aspx?id=1776&gid=287



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Edited by - Steve C. on 28 May 2017 12:15:53 PM
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Steve C.
Crazy Horse

1675 Posts

Posted - 28 May 2017 :  12:21:33 PM  Show Profile  Reply with Quote
Next questions. Is the installed height still 1.800" as delivered from Edelbrock ? This is going to play a big part in your valve spring selection.

Any port work done to them ?

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Edited by - Steve C. on 28 May 2017 12:22:17 PM
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Daywalker461
Tribal Scout

USA
5 Posts

Posted - 28 May 2017 :  12:29:21 PM  Show Profile  Reply with Quote
No Port work, they came off a 400 motor.
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Steve C.
Crazy Horse

1675 Posts

Posted - 28 May 2017 :  12:57:56 PM  Show Profile  Reply with Quote
Also if perchance you intend on using a stock factory iron intake note the comments here with Edelbrock heads that have a port opening height of 2.200":

http://forums.maxperformanceinc.com/forums/showthread.php?t=693767&highlight=Edelbrock

Note with the intakes in this specific situation and the port match issue with his unported Edelbrock cylinder heads. Typically unported Edelbrock heads can use a FelPro 1233 intake gasket that has a port opening height about 2.200" tall.


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Steve C.
Crazy Horse

1675 Posts

Posted - 28 May 2017 :  2:28:25 PM  Show Profile  Reply with Quote
Example for conversation....

"Having built a 455 with an #068, ported 4X heads and 8.5-1 compression in a 79 TA. Holley street dominator manifold with a thermoquad. No chassis mods has run 12.90's and runs 13 flats all day long. turbo 350, 3:73 gears with a TCI 2000 stall. But needs tires to run that number shifting at 4800 rpm. It makes roughly 375hp on motor."
Pontiac Dude



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Steve C.
Crazy Horse

1675 Posts

Posted - 28 May 2017 :  2:54:31 PM  Show Profile  Reply with Quote
Another example .....

http://www.lunatipower.com/Product.aspx?id=1776&gid=287


"That 703 cam is a torque monster in a 455. I installed one in a 9.2:1 455 with iron heads, and RA exhaust manifolds that made 444 ft. lbs. at 1800 RPM, made over 500 ft. lbs. from like 2700-4000 rpm, and made around 400 HP from 4500-5200, and still made 380 HP at 5700! It has 14" of vacuum at idle, and idles nice."

Here is a link to the dyno numbers if you're interested.

http://forums.maxperformanceinc.com/...d.php?t=776169

Paul Carter
Carter Cryogenics
www.cartercryo.com
520-409-7236
Koerner Racing Engines
520-294-5758


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tjs44
Cochise

USA
412 Posts

Posted - 28 May 2017 :  7:26:11 PM  Show Profile  Reply with Quote
FYI,I built a stock type 455 with 9.5 CR,we used the 2801 set straight up and it pumped 200.We could not run pump gas,had to mix race gas with it.I would be careful with small cams in the 455s.Tom
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