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2/16/14 12:10pm - Original Message: 'More Horsepower Please'
73 MRVETTE
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Joined: 6/19/2013
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I have a 73 w/ the original 350 CI (190 HP) engine. I know nothing is free, but what is the easiest ( and of course cheapest) way to get more HP out of this engine? Thanks in advance fellow C-three owners

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2/16/14 1:30pm - Reply: 'Re: More Horsepower Please'
dads2vette Lifetime Member
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Ash Fork, AZ - USA

Vette(s):
1981 Red Interior White exterior

Joined: 4/18/2007
Posts: 1038
Performance mufflers and air cleaner would be fairly cheap.  

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Dave C..........My mantra: I can not be bought!!      Long and short term leases available.
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2/16/14 6:16pm - Reply: 'Re: More Horsepower Please'
Sarge81 Lifetime Member
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WEST SENECA, NY - USA

Vette(s):
1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.

Joined: 12/3/2001
Posts: 2376
Whats your budget? Will you be doing your own work or sourcing it out?

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2/16/14 6:55pm - Reply: 'Re: More Horsepower Please'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
Mine is a '79 with similar low horsepower. I feel your pain!

I've done a few things to mine which have resulted in a feeling of more HP.

1st. I'd update the dist. I went with an MSD HEI upgrade.

2nd. I'd get your carb. rebuilt by someone who does a good job. 
(Mine still has the original Q-Jet and the rebuild was a major step in feeling like there was more HP.)

I think the open air cleaner is a good suggestion, too. I put one on a while back.

I'm going to have to wait until both of my kids graduate from college, but then I'm gonna have my motor swapped out for a crate motor with more HP. Ah yes. Someday!!!

 


|UPDATED|2/16/2014 4:55:29 PM (AZT)|/UPDATED|


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2/16/14 7:51pm - Reply: 'Re: More Horsepower Please'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 871
Those of you that think a lower restriction air filter will get you more horsepower might want to watch this.  They don't do much at all.

http://www.youtube.com/watch?v=gCi2yo4UqPI


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2/16/14 10:18pm - Reply: 'Re: More Horsepower Please'
dyoes
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Zachary, LA - USA

Vette(s):
1974 L-48 Auto. Just your basic Vette. GM crate motor w/vortec heads and intake. Crane cam. Scorpion rockers, Edelbrock carb. Lots of parts still in boxes... :(

Joined: 1/27/2013
Posts: 201
What's your budget?

If you've got an extra $1K sitting around, I'd swap the (boat anchor) cylinder heads, intake, and carb.  That, along with a new HEI distributor, is a huge bang for the buck.  Those cylinder heads are junk with a capital J (I know, mine had the same ones!)



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2/17/14 5:02am - Reply: 'Re: More Horsepower Please'
manget1 Lifetime Member
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Indianapolis, IN - USA

Vette(s):
Silver 1974 Convertible - L82 4 speed Low miles (was only 8,900 when I bought it in March 2006) - Now 42K miles. Original owner bought it as an investment for son's college expenses. 2008 Jetstream Blue Convertible - DAILY DRIVER!!

Joined: 9/3/2006
Posts: 2383
I had a good budget and I had a number of folks tell me that swapping the original engine for a crate would be cheaper than working on the original. However, since it is original and I wanted to keep it relatively so (and since I have no room to store a spare motor in my garage), I went with an upgraded cam and just a "refresh" of the original. Not a significant power gain, but is still happy with what was done. If a crate engine is in your budget, you should consider it.

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2/17/14 8:01am - Reply: 'Re: More Horsepower Please'
ceastham1
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greer, SC - USA

Vette(s):
C(6-5+2)VR - 1964 convertible 327/365 & 2003 convertible - 50th Anniversary Edition & 2010 3LT Coupe

Joined: 10/15/2007
Posts: 746
do what Marshall did ... buy a C6 !!!

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2/17/14 9:15am - Reply: 'Re: More Horsepower Please'
Case75
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
I would start with a carb rebuild and a re-curve of the distributor. Cam, heads, intake and exhaust go together if the budget allows next.

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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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2/18/14 12:59am - Reply: 'Re: More Horsepower Please'
HighDesertDave
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Carson City, NV - USA

Vette(s):
Numbers matching 1972 350 4 speed, silver pewter body with blue interior

Joined: 12/4/2013
Posts: 239
Distrib is a no brainer.....heads. You can do everything else in the world but crappy heads will never let your engine make power. Heads alone will make a significant improvement....even the cheaper GM performance aluminum heads. Edelbrock RPM are better, AFR would be the e-ticket. That and the electric distro would be an excellent base to build off of. Add intake, carb and exhaust as budget permits. Shoot, I have a nice set of worked L-98's I'd be willing to let go. I want the AFR's.

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My Christmas present to ME! Bought Sat 11-30-2013. 72, 350 4 spd, Silver with blue interior...Can't you just hear Pablo Cruz playing in the background?

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2/18/14 9:37am - Reply: 'Re: More Horsepower Please'
dads2vette Lifetime Member
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Ash Fork, AZ - USA

Vette(s):
1981 Red Interior White exterior

Joined: 4/18/2007
Posts: 1038
F4Gary said: Those of you that think a lower restriction air filter will get you more horsepower might want to watch this.  They don't do much at all.

http://www.youtube.com/watch?v=gCi2yo4UqPI


Very interesting.  I wonder what the gain or loss would be on our cars.  I assumed that with the technology in ours being 30-40 yrs old you would get much better air flow with a better air intake/filter system.  

I was just going to hook up a leaf blower to the carb and switch it on when I jumped on the gasLOL...that has got to be on youtube someplace


____________________________________
Dave C..........My mantra: I can not be bought!!      Long and short term leases available.
In the words of Zora Arkus-Duntov "Is your seat belt fastened? Alright, Let's go"


Yeah, I know, Shut up Dave.
Lifetime Member #192


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2/18/14 10:21am - Reply: 'Re: More Horsepower Please'
Case75
Former Member
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
dads2vette said:
F4Gary said: Those of you that think a lower restriction air filter will get you more horsepower might want to watch this.  They don't do much at all.

http://www.youtube.com/watch?v=gCi2yo4UqPI


Very interesting.  I wonder what the gain or loss would be on our cars.  I assumed that with the technology in ours being 30-40 yrs old you would get much better air flow with a better air intake/filter system.  

I was just going to hook up a leaf blower to the carb and switch it on when I jumped on the gasLOL...that has got to be on youtube someplace

Check this out. http://www.hotrod.com/techarticles/engine/hrdp_1105_leaf_blower_supercharger/



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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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2/18/14 11:44am - Reply: 'Re: More Horsepower Please'
dads2vette Lifetime Member
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Ash Fork, AZ - USA

Vette(s):
1981 Red Interior White exterior

Joined: 4/18/2007
Posts: 1038
My Gawd, you gotta love this internet thing!  That's it, I'm buying a couple or 4 leaf blowers!

____________________________________
Dave C..........My mantra: I can not be bought!!      Long and short term leases available.
In the words of Zora Arkus-Duntov "Is your seat belt fastened? Alright, Let's go"


Yeah, I know, Shut up Dave.
Lifetime Member #192


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2/18/14 11:44am - Reply: 'Re: More Horsepower Please'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 871
dads2vette said:
F4Gary said: Those of you that think a lower restriction air filter will get you more horsepower might want to watch this.  They don't do much at all.

http://www.youtube.com/watch?v=gCi2yo4UqPI


Very interesting.  I wonder what the gain or loss would be on our cars.  I assumed that with the technology in ours being 30-40 yrs old you would get much better air flow with a better air intake/filter system.  

I was just going to hook up a leaf blower to the carb and switch it on when I jumped on the gasLOL...that has got to be on youtube someplace


To me, you only benefit from a low restriction air filter at high rpm.  We don't operate our cars near redline.  I could see getting an AEM Dry Flow just so you don't have to buy any more paper ones and you don't have to oil the Dry Flow.

I'm just sticking to stock air filters on my daily drivers.  I took the K&N off my truck after I looked at the MAF sensor in the intake tube.  Oily film on it and I didn't over oil the filter.


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2/20/14 6:19am - Reply: 'Re: More Horsepower Please'
dyoes
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Zachary, LA - USA

Vette(s):
1974 L-48 Auto. Just your basic Vette. GM crate motor w/vortec heads and intake. Crane cam. Scorpion rockers, Edelbrock carb. Lots of parts still in boxes... :(

Joined: 1/27/2013
Posts: 201
Heads heads heads!!

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"Let them that don't want none have memories of not gettin' any."
- Brother Dave Gardner

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2/20/14 1:19pm - Reply: 'Re: More Horsepower Please'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
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73 MRVETTE said: I have a 73 w/ the original 350 CI (190 HP) engine. I know nothing is free, but what is the easiest ( and of course cheapest) way to get more HP out of this engine? Thanks in advance fellow C-three owners


Horsepower is for bragging...torque is for driving. That being said....are you looking for top speed, or just more 'round town driving grunt? Top speed has more to do with horsepower, while bottom end, off the line performance is mostly torque related.
A good intake/carb combo, and a nice set of headers with free flowing exhaust system is the easiest, and cheapest performance enhancements you can make without tearing into the engine. Big cams require higher compression to function properly, plus larger valves/better heads will increase that even more. But...start with the basics(intake/carb/headers/exhaust), and then you can build on that foundation later, as time & $$$$ allow. A good electronic ignition will help, too, but you may not be able to "feel" the increase in performance....


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2/21/14 1:24am - Reply: 'Re: More Horsepower Please'
We Gone
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Vette(s):
1982 CE, also own 96 CE LT4, 91 ZR-1, 95 LT1, 2004 coupe

Joined: 11/1/2013
Posts: 6
Go to a  3.73 rear gear.

|UPDATED|2/20/2014 11:24:40 PM (AZT)|/UPDATED|
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2/21/14 1:39am - Reply: 'Re: More Horsepower Please'
HighDesertDave
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Carson City, NV - USA

Vette(s):
Numbers matching 1972 350 4 speed, silver pewter body with blue interior

Joined: 12/4/2013
Posts: 239
You can get a set of Edelbrock RPM aluminum heads for less than the intake/carb/free flowing exhaust. Bigger valves, stainless seats, better flow AND port velocity plus....bonus, more compression with the closed chambers.....just sayin. Yes, its a bigger tear down but man, your on your way to a 450 HP if you wanna plug in the other matching bolt ons. 

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My Christmas present to ME! Bought Sat 11-30-2013. 72, 350 4 spd, Silver with blue interior...Can't you just hear Pablo Cruz playing in the background?

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2/21/14 7:34pm - Reply: 'Re: More Horsepower Please'
stingrayjim jr Lifetime Member
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SHELBYVILLE, TN - USA

Vette(s):
1976 L48 auto

1978 L82 4speed

1994 LT1 6speed

Joined: 7/5/2002
Posts: 3937
Head swap would be one of ways to go. On dad's 76 it was a stock engine(180 hp) that  had been rebuilt stock which was probably for the best as i was just starting to drive and probably gotten into trouble if it had a little more ponies..... but that aside, i did go to a swap meet and found a set of heads, 1966 double hump small valve heads.  picked them up fairly cheap, had the local shop redo the valves and guides, which  actually costed more than the heads did... but the main thing i would suggest is that if you do 'shop' around for a set of older heads, do make sure(MAKE SURE) it has the facing and bolt taps for accessory mountings... the ones i got did not, a veeeerrrryyyyy discouraging detail i overlooked... but i was a little kniave then, didn't turn a wrench to often back then, but live and learn... long story short, the heads did add about 1500 more rpms to the redline area, and could definatly feel a bit more 'umph' under the hood.... that was with a 308 gear, later replaced with a 370 which did push you back in the seat a little more....

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