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1977 Mods (Read 6445 times)
Jul 12th, 2011 at 5:23pm

350shark   Offline
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Madison, WI

Gender: male
Posts: 80
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Hi all,

First off, I'm new to the forum.  This is a great forum, lots of good info and awesome vettes!

I have a stock L48 77, and I'm looking to de-smog it and get some more power.  I still want it to be a good street driver, so nothing too crazy, but the stock 180 hp isn't quite getting it for me  Grin I'm thinking aluminum heads, new cam, carb, and manifold.

Any advise on good combos of the above, or anything else I should look into doing, would be greatly appreciated.

Thanks!
Dave
 

'77 L48
All stock...for now...
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Reply #1 - Jul 12th, 2011 at 5:41pm

Redwingvette   Offline
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Red Vettes are the best
Waterford, Michigan

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Posts: 717
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Heads and a cam are a good start for some extra power. There is nothing wrong with the carb if it is tuned correctly. Some cheap easy HP can be found by re-curving the distributor if you know what to do. A good manifold can help the heads breath easier.
 

Brian
73 Coupe, Performer RPM Heads & intake
Holley carb
Crane Cam, Roller rockers
BTO 200-4R trans, 3.55 gear
F-body seatbelts,
Magnaflow Exhaust.
NCM Lifetime Member
http://www.cardomain.com/ride/565523
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Reply #2 - Jul 13th, 2011 at 6:12am

TX 73 gone   Offline
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My Vette went to a good
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Sugar Land, TX

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Heads and cam alone will do wonders for you. Just depends on what you are looking to spend. a lot of guys keep the factory carb and as long as it's not acting up, I wouldn't change it. After market intakes are great but all your hoses and brackets may have to move. Give the disty a tune up and for sure re-curve it to advance a little sooner and you have better response. I recently bought a comp cam XS-262 cam and solid lifters. It has a noticeable idle and works great with the stock converter. anything bigger and you will loose low end torque. For the heads, changing to 64 cc and 194/150 valves should work well with your stock pistons and exhaust. You can go 202/160 but you probably you will be spending more time at the gas pump.

Charlie
 

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Reply #3 - Aug 28th, 2011 at 7:23am

seventyate   Offline
Top Gun Member
My C3 is a "76"
Scott Township (Montdale) Pa.

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Posts: 1151
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Jack, not knowing what you meant by re curving a distributor I had to do a search and found this. You would know if they are right and maybe it will help some one.  Really something that if can gain you 16 to 20 HP. http://www.hotrodders.com/forum/re-curving-distributor-107765.html
Ed
 

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Reply #4 - Aug 28th, 2011 at 7:45am

68-73-77   Offline
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NCRS Member 68,73,77 Corvettes
Newark,Delaware

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On a stock 350 I would say 36-38 degrees at 2500-2700 rpm would be best. This is easily checked with a dial back timing light. If it pings drop it a degree or 2. I always set them for max degrees & never worry about what the initial timing is. The distributor in my blue vet & dodge is a totally electronic MSD which allows me to pick from 100's of degree curves. You should also check your air fuel mixture when you are doing this & go for 12.5 to 13 on the mixture. It all sound kinda confusing but if you ever saw it done it's not really that hard.
Alan Smiley
 
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Reply #5 - Apr 21st, 2018 at 2:19am

ScottinMaine   Offline
Newbie
I Love my Corvette!
Maine

Gender: male
Posts: 1
 
New member here, just bought a '77 in good shape and all stock.  Will post pics and details when I get settled.  I know this is an old post, but I'm surprised it doesn't include ripping out the complete exhaust system and cat and replacing with a Pypes 2.5" or equivalent.  Isn't the exhaust system the bottleneck in these cars?  Also, if it's registered as an antique and does not have to pass inspection, what about removing the air pump and associated hardware and hoses?

Thanks for any feedback...
 
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Reply #6 - Apr 21st, 2018 at 6:24am

68-73-77   Offline
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NCRS Member 68,73,77 Corvettes
Newark,Delaware

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Posts: 8394
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Welcome to the forum. Removing any emission crap will help. Going with duals 2" pipes is better & good mufflers. If you go with a bigger exhaust you'll lose back pressure & TQ. A newer distributor & good spark plugs will increase power too. I think you can get these engines up to around 250 hp with changes like these.
Alan Smiley
 
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