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Corvette getting engine upgrades, or how we spent the 4th-5th. Login/Join 
Shaman
Picture of ScreamingCockatoo
posted






Test fitting the heads. The alignment pins must be clean.



Ooooo! A new bump stick! (camshaft)








Well everything was going great until one bolt went loose at 30 pounds...
So now it's drill the block, tap it and screw in an insert. Ugh.






He who fights with monsters might take care lest he thereby become a monster.
 
Posts: 40143 | Location: Atop the cockatoo tree | Registered: July 27, 2002Reply With QuoteReport This Post
Partial dichotomy
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You guys have no fear. Looking good!




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Posts: 40303 | Location: SC Lowcountry/Cape Cod | Registered: November 22, 2002Reply With QuoteReport This Post
Raptorman
Picture of Mars_Attacks
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The other head torqued right down. We ordered a thread insert kit and will be repairing the block.

It was a setback, but it's just too hot to go do car shows.

The engine was defectively drilled from the factory and the threads were damaged upon head bolt removal. We didn't discover this until we inspected the old head bolt.


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Posts: 34996 | Location: North, GA | Registered: October 09, 2002Reply With QuoteReport This Post
My other Sig
is a Steyr.
Picture of .38supersig
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Nice!

Were you able to get roller lifters and rockers? Looks like some big ol' ports on those heads.

I haven't done anything internally with my ride as of yet, but long tube headers and 3" dual exhaust did get the air moving a bit better.

It is a good thing I didn't hope for an increase in fuel economy. Wink

Send us some more updates when you can.



 
Posts: 9874 | Location: Somewhere looking for ammo that nobody has at a place I haven't been to for a pistol I couldn't live without... | Registered: December 02, 2014Reply With QuoteReport This Post
Shaman
Picture of ScreamingCockatoo
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quote:
Originally posted by .38supersig:
Nice!

Were you able to get roller lifters and rockers? Looks like some big ol' ports on those heads.

I haven't done anything internally with my ride as of yet, but long tube headers and 3" dual exhaust did get the air moving a bit better.

It is a good thing I didn't hope for an increase in fuel economy. Wink

Send us some more updates when you can.


1.6 roller rockers. Flat tappet on the cam.(a mild cam at that, I want torque not RPM).
I'm not doing headers as it would require a complete new exhaust.
The original rams horns actually work well.
I'm not going to turn up enough rpm for scavenging.


Removing the old smog heads and intake will actually increase fuel economy and almost double the horsepower.





He who fights with monsters might take care lest he thereby become a monster.
 
Posts: 40143 | Location: Atop the cockatoo tree | Registered: July 27, 2002Reply With QuoteReport This Post
Shall Not Be Infringed
Picture of nhracecraft
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quote:
Originally posted by ScreamingCockatoo:

Interesting 'footwork' there...Never seen that done on an engine we working on/intended to run afterwards! As a rule, I prefer to keep the internal areas/machined surfaces of the engine pretty much sterile during 'racecraft' activities. Razz


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Posts: 9999 | Location: New Hampshire | Registered: October 29, 2011Reply With QuoteReport This Post
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My last two years of HS were in a vocational school for Automotive Mechanics. To graduate, my study buddy and I had to build a 283 Chevy motor from a bare block. Including honing the cylinder walls and grinding the valves. And it had to run on a test stand for 10 minutes.
Your project brings back my memories of building that motor. Lets see it when its running!


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Posts: 17009 | Location: Marquette MI | Registered: July 08, 2014Reply With QuoteReport This Post
His diet consists of black
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Picture of egregore
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quote:
As a rule, I prefer to keep the internal areas/machined surfaces of the engine pretty much sterile during 'racecraft' activities.

Purpose-built race cars have the luxury of easy access to the engine. Even with the hood (which is front-hinged) off, it's a looong reach over the nose or fenders of a "C3" Corvette to the front or top of the engine.
 
Posts: 30111 | Location: Johnson City, TN | Registered: April 28, 2012Reply With QuoteReport This Post
Member
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Many year ago I rebuilt a small block 350 4 bolt main for my '69 Camaro SS. I took great pains to keep everything very clean. This one was out of the car on an engine stand. I used a flat tappet Competition Cams 260 camshaft. I also wanted torque over high rpm horsepower. I finished everything up and installed the engine. I was installing the last starter bolt when "snap" the bolt broke off in the block flange. I repaired it with JB Weld and several years later when I sold it to buy my first Corvette the JBW repair was still holding strong. Haven't built another engine since but I am glad I had the opportunity to do it. A great experience. By the way that engine had a ton of torque easily spinning both tires in second gear with a 3.36:1 rear end.


JEREMIAH 33:3
 
Posts: 2988 | Location: Eastern NC | Registered: March 14, 2011Reply With QuoteReport This Post
Raptorman
Picture of Mars_Attacks
posted Hide Post
quote:
Originally posted by egregore:
quote:
As a rule, I prefer to keep the internal areas/machined surfaces of the engine pretty much sterile during 'racecraft' activities.

Purpose-built race cars have the luxury of easy access to the engine. Even with the hood (which is front-hinged) off, it's a looong reach over the nose or fenders of a "C3" Corvette to the front or top of the engine.


AND the nose was two feet off the ground to access the underside for access to the fuel pump, radiator mounts and manifolds.

Made it very difficult to put the cam in without climbing into the engine bay. I ensured the cylinder bores were clean before buttoning it up.

The engine hoist and stand are already in use as observed by the 300Z engine in the background........ Well, it had to be observed first.

We have three cars in progress at the moment, plus everyone comes over on the weekends to work, leaving resources spread pretty thin.


____________________________

Eeewwww, don't touch it!
Here, poke at it with this stick.
 
Posts: 34996 | Location: North, GA | Registered: October 09, 2002Reply With QuoteReport This Post
Shaman
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I've built a LOT of engines.
From a simple, "please just make it stop knocking(damn thing lasted 3 years for him)" to full on precision custom honed bearing surfaces for tighter tolerances.

I can *knock on wood• say I've never had one come apart.
Even from having to stand on it.
Compressed air is your friend.





He who fights with monsters might take care lest he thereby become a monster.
 
Posts: 40143 | Location: Atop the cockatoo tree | Registered: July 27, 2002Reply With QuoteReport This Post
Age Quod Agis
Picture of ArtieS
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Nice job, guys, what is the target when done?

Torque, horsepower?

Are you shooting for the 1 hp per cu/in goal?

Are we going to see twin turbochargers on it next year, or maybe a roots blower with twin carbs and a high hat sticking out of the hood?



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Posts: 13261 | Location: Central Florida | Registered: November 02, 2008Reply With QuoteReport This Post
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What, if anything, are you doing for an intake and carb?
 
Posts: 30111 | Location: Johnson City, TN | Registered: April 28, 2012Reply With QuoteReport This Post
Shaman
Picture of ScreamingCockatoo
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quote:
Originally posted by ArtieS:
Nice job, guys, what is the target when done?

Torque, horsepower?

Are you shooting for the 1 hp per cu/in goal?

Are we going to see twin turbochargers on it next year, or maybe a roots blower with twin carbs and a high hat sticking out of the hood?


2101 intake, so the stock Quadrajet 700 cfm and air breather fits.
I want it to look stock. It'll make about 325Hp.


I had to go with 1.6 rockers. Because of the rocker studs.





He who fights with monsters might take care lest he thereby become a monster.
 
Posts: 40143 | Location: Atop the cockatoo tree | Registered: July 27, 2002Reply With QuoteReport This Post
186,000 miles per second.
It's the law.




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Very impressed!
 
Posts: 3297 | Registered: August 19, 2001Reply With QuoteReport This Post
Member
Picture of Greymann
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Nice upgrade.
Should make a big difference. Smile
That bad bolt hole is a drag.
Minor inconvenience.

What heads and cam did you choose?

.
 
Posts: 1833 | Location: New Mexico | Registered: March 21, 2017Reply With QuoteReport This Post
Shaman
Picture of ScreamingCockatoo
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quote:
Originally posted by Greymann:
Nice upgrade.
Should make a big difference. Smile
That bad bolt hole is a drag.
Minor inconvenience.

What heads and cam did you choose?

.


Heads: Speedmaster III 190CC runners, big valves, 1.6 roller rockers.

Cam Summit 1102- Duration at 050 inch Lift: 204 int./214 exh.
Advertised Duration: 278 int./288 exh.
Valve Lift with Factory Rocker Arm Ratio:0.421 int./0.444 exh.
Lobe Separation (degrees):112

Edelbrock 2101 intake





He who fights with monsters might take care lest he thereby become a monster.
 
Posts: 40143 | Location: Atop the cockatoo tree | Registered: July 27, 2002Reply With QuoteReport This Post
A Grateful American
Picture of sigmonkey
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quote:
Originally posted by nhracecraft:... I prefer to keep the internal areas/machined surfaces of the engine pretty much sterile during 'racecraft' activities. Razz


Pshaw!

In the south, we hit it with the garden hose and follow up with the air compressor.

If we're real concerned, we'll wait and clean it up on a moonless night.




"the meaning of life, is to give life meaning" Ani Yehudi אני יהודי Le'olam lo shuv לעולם לא שוב!
 
Posts: 45474 | Location: Box 1663 Santa Fe, New Mexico | Registered: December 20, 2008Reply With QuoteReport This Post
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