340 4-bbl auto cam in 273 ?
#891869
12/30/10 05:38 PM
12/30/10 05:38 PM
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Joined: Nov 2004
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Hatfield,Pa.
bigD
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Ok starting to put my 69 273 together w/ left over odds and ends. I'm using Std. bore Hi-comp pistons from another 273 that I had,69 heads,LD-4B intake,500 cfm eddy,cast iron manifolds,dual exh. That being said will the factory 340 4BBl cam work ok with this? I will be using adjustable rockers and correct length hyd.pushrods along with it.Thanks for any input on this  ,D 
2015 Chrysler200s,2008 Charger R/T R&T,1999 Dakota R/T,1999 Viper ACR,1968 Charger R/T.
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Re: 340 4-bbl auto cam in 273 ?
[Re: bigD]
#891870
12/30/10 05:41 PM
12/30/10 05:41 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
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Don't see why not, it's fairly mild today. Just make sure you have the right springs. I do not think lift will be an issue with either coil bind or piston to valve clearance, but it would not hurt to double check.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: 340 4-bbl auto cam in 273 ?
[Re: bigD]
#891871
12/30/10 06:16 PM
12/30/10 06:16 PM
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HYPER8oSoNic
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Quote:
Ok starting to put my 69 273 together w/ left over odds and ends. I'm using Std. bore Hi-comp pistons from another 273 that I had,69 heads,LD-4B intake,500 cfm eddy,cast iron manifolds,dual exh. That being said will the factory 340 4BBl cam work ok with this? I will be using adjustable rockers and correct length hyd.pushrods along with it.Thanks for any input on this ,D
 with Supercuda. Can't see why not. Back
in 1966 the Dart with the 235 horse/273 motor had
an additional option for that car/motor package.
It was dubbed "D-Dart". Same 10.5 cr motor but with a 700 cfm Holley carb, 284 degree 495 I, 505 Ex solid cam with matching springs and hardware.
Dougs headers were part of the package, as well
as the 4-speed and 4.89 gears w/ posi too! That cam in it was RADICAL for it's engine size. As a comparison to the D-Dart, my final answer on the 340 auto cam, is "Oh
Yeah"!! Just be sure of your clearances inside those combustion chambers and you MAY want to degree the cam also depending on HOW you drive the car. If you can, put headers on it, since it needs the LEAST amount of breathing restrictions on the exhaust side. If sticking with the cast iron exhaust manifolds, the hi-po 340 units are best. The 500 cfm AFB may need a rejet!! And a recurved electronic ignition setup will really make it all come alive  (but remember it's no 340!)
Last edited by HYPER8oSoNic; 12/30/10 11:28 PM.
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Re: 340 4-bbl auto cam in 273 ?
[Re: bigD]
#891872
12/30/10 06:54 PM
12/30/10 06:54 PM
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Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
Chris2581
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Jacksonville, FL
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Will make a nice running engine. I used the 340 cam in a few 318's and they ran great.
Nautilus Racing-
We use Superformance gaskets and Turbo Action converters/products.
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Re: 340 4-bbl auto cam in 273 ?
[Re: Chris2581]
#891873
12/30/10 10:02 PM
12/30/10 10:02 PM
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Joined: Dec 2005
Posts: 597
West Newbury, MA
MOPAR_AMC_FAN
mopar
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mopar
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West Newbury, MA
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Quote:
Will make a nice running engine. I used the 340 cam in a few 318's and they ran great.
Good to know. I was thinking of throwing one in a stock 318 I have. On the cheap, ya know...
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Re: 340 4-bbl auto cam in 273 ?
[Re: Chris2581]
#891875
12/31/10 12:12 AM
12/31/10 12:12 AM
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Joined: Nov 2004
Posts: 1,601
Hatfield,Pa.
bigD
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OP
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Quote:
Will make a nice running engine. I used the 340 cam in a few 318's and they ran great.
Ran one in my 318 Coronet that I sold recently,w 3.55 gears/2500 stall it was a beast(for a S/B),smoked many a 350 powered chevy ,D.
2015 Chrysler200s,2008 Charger R/T R&T,1999 Dakota R/T,1999 Viper ACR,1968 Charger R/T.
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Re: 340 4-bbl auto cam in 273 ?
[Re: bigD]
#891877
01/01/11 11:16 AM
01/01/11 11:16 AM
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Joined: Oct 2005
Posts: 210
Florida
ddartdude
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Florida
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Quote:
Ok starting to put my 69 273 together w/ left over odds and ends. I'm using Std. bore Hi-comp pistons from another 273 that I had,69 heads,LD-4B intake,500 cfm eddy,cast iron manifolds,dual exh. That being said will the factory 340 4BBl cam work ok with this? I will be using adjustable rockers and correct length hyd.pushrods along with it.Thanks for any input on this ,D
All the HiPO 273's came with closed chamber heads, as did the D/Dart. The D/Dart had a 750 CFM Holley on a cast irom single plane intake. You might need a little more carb.
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Re: 340 4-bbl auto cam in 273 ?
[Re: ddartdude]
#891878
01/01/11 03:07 PM
01/01/11 03:07 PM
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Joined: Jun 2006
Posts: 5,167
CT
GTX MATT
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My Satellite came with a 273 with a supposed 340 cam in it. I believe it did have it. It liked alot of initial advance and had a bit of a gallop to it at idle. With 2.94 gears in my heavy B body it was decent with short (25 inch) tires, at least much faster than I expected a little 273 to be. It definitely made more power than any stock 350 Chevy or 302 Ford I've ever witnessed. But no comparison to a 440. Everything else about it was stock though. They must have used stock 273 springs though because around 4500 rpm the valves would start floating.
Last edited by GTX MATT; 01/01/11 03:08 PM.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: 340 4-bbl auto cam in 273 ?
[Re: ddartdude]
#891879
01/01/11 04:44 PM
01/01/11 04:44 PM
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HYPER8oSoNic
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Quote:
Quote:
Ok starting to put my 69 273 together w/ left over odds and ends. I'm using Std. bore Hi-comp pistons from another 273 that I had,69 heads,LD-4B intake,500 cfm eddy,cast iron manifolds,dual exh. That being said will the factory 340 4BBl cam work ok with this? I will be using adjustable rockers and correct length hyd.pushrods along with it.Thanks for any input on this ,D
All the HiPO 273's came with closed chamber heads, as did the D/Dart. The D/Dart had a 750 CFM Holley on a cast irom single plane intake. You might need a little more carb.
The 500 EDDY should be fine. If YOU should feel
that a larger carb is needed, go NO larger than the
625 AFB. I believe it can bolt right on. BUT CHECK
your throttle blade bores on your manifold, FIRST!! Sizes MAY differ slightly between the two carbs. You may lose a litle bit of the snappy performance that the 500 provided, but may gain in
mid to upper power. You WILL need GEARS for the newer carb, IF chosen. It's a comprimise, either way there is no loss. 
Last edited by HYPER8oSoNic; 01/01/11 04:50 PM.
"Stupidity is Ignorance on Steroids"
"Yeah, it's hopped to over 160" (quote by Kowalski in the movie Vanishing Point 1970 - Cupid Productions)
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Re: 340 4-bbl auto cam in 273 ?
[Re: jcc]
#891880
01/03/11 01:16 PM
01/03/11 01:16 PM
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Joined: Nov 2004
Posts: 1,601
Hatfield,Pa.
bigD
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Quote:
Not mentioned so far, but the biggest bang for buck is your expected CR, any head milling, or guesses what it might be? 
CR should be around 9.5-9.7(w/.040 gasket)from what I have been told. Worst case 9.0 cr,way better than the 7.5-8cr w the flat tops,D
2015 Chrysler200s,2008 Charger R/T R&T,1999 Dakota R/T,1999 Viper ACR,1968 Charger R/T.
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