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Re: Get out of it's own way - 340 RR
[Re: Paul_Fancsali]
#771395
08/14/10 12:37 AM
08/14/10 12:37 AM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
The point I'm making is most big blocks of that era 73-75 suffered more power loss then the equvalent small block. a 340 was rated 275 hp a 440 same year was 375 |In 1973 they were 340 net 240 and 280 net 440. That is big diff.
Yes, but you conveniently omit the fact that in 73 the 440 had almost 100 more ft-lbs of torq and at a lower rpm. In two identical 73 RR's with the same converter, trans and gears, the 440 car will win. The extra torq at a lower rpm will perform better with the stock torq converter and give the oomph you need to get that heavy car moving.
If you're comparing a hi-cr era lightweight 340 a-body to a smogger low comp 73 440 b-body you are NOT comparing apples to apples.
To the OP, a turbo or supercharger setup would make your 340 feel like a totally different animal. If you want to do something fun on a budget, you can pickup a used centrifugal supercharger like a paxton sn2000, sn93 or sn89. They are perfectly sized for a small block and don't go for that much $$. Pop in that 268 cam, do a set of headers, intake, carb and that supercharger and you could be in the 350-400hp zone easy while giving you the bottom end torq you need. 
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Re: Get out of it's own way - 340 RR
[Re: DaytonaTurbo]
#771396
08/14/10 12:45 AM
08/14/10 12:45 AM
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Joined: Jul 2004
Posts: 12,815
Tulsa, Oklahoma
Wagonmaster
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 12,815
Tulsa, Oklahoma
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This really is not meant to be  too much, but one of the more fun cars I had was a bone stock '73 GTX. Looked a bit rough, but was absolutely a virgin. Put a battery in, repaired the radiator, a quick tune and I was VERY impressed. '73 GTX B-body w/440 stock. The reason my wife wouldn't ride with me in a toy car again. Long story, but very decent car. Your 340 car could eat up lots of coin making it close to a 440 compatible car. Save the aggrivation, stuff a 440 in it, save the 340 and save lots of $$, too! Just my 
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Re: Get out of it's own way - 340 RR
[Re: Wagonmaster]
#771397
08/14/10 11:26 AM
08/14/10 11:26 AM
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Joined: Jan 2005
Posts: 12,492
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,492
Kalispell Mt.
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A pair of magnum heads could wake it up quite a bit in the air flow department and compression and the 1.6 ratio rockers will make the cam work like it is slightly bigger. Make sure you use the thin head gaskets and you WILL notice a differance. You can get stock re-built heads from flea-bay for a couple hundred bucks, have them re-drilled at a local machine shop for under $100 (If you were close by I only charge $50), buy a gasket set, conversion pushrods from mancini and be done, then you can keep you stock short block in the car and it will make more power than a 68 340.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Get out of it's own way - 340 RR
[Re: RebelDart]
#771400
04/11/11 03:37 PM
04/11/11 03:37 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
What years for the heads would be recommended - finally on the road and as expected --- not impressive .............. yet.
junkyarding, '92-01 318's or 92-02 360's....
while yarding, get the retainers off of some 2.2L/2.5L mopar 4 bangers, and buy some hughes #1110 valve springs.
or if you don't want to go through the hassle, buy these new enginequest 318B heads with LA bolt pattern, #1110 springs and new OEM spec valves. should flow ~ 10% better than OEM magnum heads. I'd also pick up a comp XE256 cam while you're at it.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Get out of it's own way - 340 RR
[Re: Mr.Yuck]
#771402
04/11/11 04:09 PM
04/11/11 04:09 PM
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Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
DPelletier
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
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Quote:
I don't think abody is saying that at all. But a stock 340 vs a stock 440 in the same car the 440 wins. A mild 340 vs a mild 440 in the SAME car the 440 wins. Just like if you put a 440 in an a-body and a 340 in the other, they have they same build a little cam, compression, gear, intake carb, the 440 WINS. Jeesh.
Of course; any one suggesting otherwise is 
You can't have a 100 cubic inch disadvantage on similarly built motors and not have a significant performance difference.
My cousin's 340 Duster was one of the fastest cars I've ever driven but at 14.5:1, solid lifters, etc, etc, it was FAR from stock! 
Dave
Last edited by DPelletier; 04/11/11 04:11 PM.
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