These have been in development for many months and they are finally ready and in stock! Here are the details:

C3 Corvette, Possibly C2 Corvette
Primary Size: 1 7/8"
Collector Size: 3"
Flange: 5/16"
Material: 321 Polished Stainless Steel
Fit: Small Block Chevy, Straight Plug Heads
Price: Special Introductory pricing is $575
Shipping: $50 Continental US, email for international shipping

Get them while they are hot!!

http://img689.imageshack.us/img689/1214/smallblocklargeborehead.jpg

http://img46.imageshack.us/img46/7022/headerssidepipes078.jpg

http://img32.imageshack.us/img32/2042/headerssidepipes079.jpg

You can contact me by:
Phone: 507-581-3076
Email: CustomImageCorvettes@gmail.com

very nice! only in straight plug config.? do you intend to offer angle plug type later?

how much motor am i going to need before going to a 1 7/8" primary? i'm running a 1 5/8 mid length now.

I know that they don't fit the angle plug Edelbrock heads. They do fit angle plug AFR heads. We are researching the rest of the options.

I would say that you should be pushing at least 400+ cubes. But it depends on what you are trying to do with the car.

ok, theyre beautiful but nothing i'd ever come close to needing on my very mild 350/auto combination..............again though absolutely beautiful work, theyre like jewelery thats actually useful.

I just got my 80 Vette a few days ago. If I get this heades what else do I need in order to intall them? Is it a straight bolt on into the factory system or do I have to replace the rest of the exhaust system and make it an acutal dual exhaust? I am planing on making it dual exhaust all the way, I just want to know if I can start with this and slowy move to the rest.

short answer, no. headers generally bolt right up with only slight mod to A/C mount but your current exhaust is a 2into1into 2 system.. if you go to this type header, you will need to go to an exhaust shop to fab up the duals or you can get a pre-fab kit from vendor with every thing you need and install it yourself. http://www.summitracing.com/parts/HOK-16521HKR/

Are these headers for off-road use only?? 1-7/8" tubes seem much too big except for F.I. apps or all out high RPM. The exhaust velocity is just too low for street use. :thumbsup3:

There are lots of reasons to use the 1 7/8" primary. A 383 with high flowing heads can efficiently utilize this size primary. Saying that the exhaust velocity is too low for street use is a pretty broad statement and mostly false. Maybe for a stock 350 you will loose some power but not everyone has that. There are lots of 383, 396 and 427 cubic inch small blocks out there that can take advantage of a larger primary header.

So then, what is the exhaust vel. for a typical 383" motor at Max HP with your headers? I'm sure you have test data.

Yeah, I agree with HotRod, 17/8 tubes are too much for the average street 350.. But 400 cubes or Forced Induction would certainly benefit.. But most importantly, THEY LOOK GOOD!

Yeah, they do look good and the quality looks up to par also.

Hotrod,

So then, what is the exhaust vel. for a typical 383" motor at Max HP with your headers? I'm sure you have test data.

I'm just an old guy that has been around racing for over 50 years and I have gained a lot of experience during that period of time. One of the things that I learned was how to spot a WISE A$$ and my friend you are half way there. Pay attention and some day you might qualify for the both the first and last part of the title as opposed to qualifying for only the last half of the title.

If he gave you the amount of velocity you wouldn't have a clue about what he gave you. Just keep on blowin' your smoke through those pathetic 1 5/8" diameter Hedman headers and don't be pesterin' the guy that tryin' to help you go fast.

I'm gona buy a set of these headers just as soon as I can save up some money out of my SS check. There gona make my 427ci SBC haul A$$

McGurk

the 427ci can take advantage of the 1 7/8 tubes, but the average 350ci will lose power with them because of lost velocity and scavenging.. an optimum situation is where intake and exhaust flow match.. increasing one without the other is ineffective to say the least. this is one case where bigger is not better! My motor is cranking out 525hp /498ftlbs torque at 6200rpm, thru those same "pathetic" Hedman Headers..

I have never owned a set of hedders because I rarely wind my engines up beyond 3000 to 4000 rpm. And then during those few times I rev them up to 5000 rpm (or more) I'm only doing it for several seconds at most.

Toobroke ,as much as you like fabricating stuff, I m surprised you haven t built your own headers yet..

Hotrod,

I'm just an old guy that has been around racing for over 50 years and I have gained a lot of experience during that period of time. One of the things that I learned was how to spot a WISE A$$ and my friend you are half way there. Pay attention and some day you might qualify for the both the first and last part of the title as opposed to qualifying for only the last half of the title.

If he gave you the amount of velocity you wouldn't have a clue about what he gave you. Just keep on blowin' your smoke through those pathetic 1 5/8" diameter Hedman headers and don't be pesterin' the guy that tryin' to help you go fast.
McGurk

Well thats quite a first post you got there McGurk !!
Being that you don't even know me or my background what makes you think I wouldn't have a clue about exhaust Vel.? You really have no idea who you are talking to !!

Since you have so much experience as a racer, then why don't you enlighten me as to what the approximate exhaust velocity is for your 427SBC.

If you knew anything at all, you would know that the tube diameter is one of the first things you consider when selecting a header. To select the correct tube diameter one of the things you must know is the exhaust velocity. :toilet:

HotRod, I ve noticed that he hasn t made a second post! wonder why? there s a saying about ," better to keep quiet and be thought a fool, than to speak and prove it."

HotRod, I ve noticed that he hasn t made a second post! wonder why? there s a saying about ," better to keep quiet and be thought a fool, than to speak and prove it."

How true....Some people only open their mouth to change feet. :doh:

Here are some actual results from a back to back dyno run. 1 5/8" Hookers vs. 1 7/8" XS-Power

2.9 TQ and 12.9 HP yea for the 1 7/8"!! :rockon6rk:

Engine Specs

Chevy small block
4.030” bore x 3.750” stroke
382.8 Cubic Inch Displacement
10.3:1 Compression Ratio

Block: GM 350 4-bolt .030” overbore
Engine Block Style: Stock
Engine Block Material: Cast iron
Main Bolt Style: 4-bolt ARP bolts
Main Caps: Stock
Main Cap Material: Ductile iron
Align honed Yes

Crankshaft: Eagle 383 Cast Crank - p/n 103503750

Polished by Mile High Cranks
Rear Main Seal Style: 2-piece
Stroke (in): 3.75 in.
Engine Balance: External
Balanced Yes
Rated 500 hp
Main Bearings Clevite MS909HG

Rods: Eagle 6000BST2000
Length Center to Center: 6.000 in.
Rod Beam Style: H-beam
Rod Material: Forged 4340 steel
Rod Finish: Shot-peened
Wrist Pin Style: Floating
Cap Retention Style: Cap screw
Rod Bolt Brand: ARP
Rod Bolt Diameter: 7/16 in.
Rod Bolt Material: ARP
Fastener Yield Strength (psi): 200,000 psi
Rod Bolt Head Style: 12-point
Connecting Rod Weight (g): 645
Big End Bore Diameter (in): 2.100 in.
Pin End Bore Diameter (in): 0.927 in.
Horsepower Rating (hp): 1,200 hp
RPM Rating: 9,500 rpm
Rod Bearing Clevite CB663HN

Pistons: JE Racing 138093
Bore (in): 4.030 in.
Piston Style: Flat top, with two valve reliefs
Piston Material: Forged aluminum
Compression Distance (in): 1.125 in.
Piston Head Volume (cc): +5.00cc
Wrist Pin Style: Floating
Pin Diameter (in): 0.927 in.
Piston Ring Thickness: 1/16 in. x 1/16 in. x 3/16 in.
Weight: 416 grams
Rings: JE Pistons J100014155-5 File Fit .018” top, .020

2nd
Ring Set: J10008-41555
Spiral Locks: JE Pistons 927042CS

Camshaft: CompCams 12-423-8 [10,46]
Grind: XR276HR
XTREME Energy™ Retro-Fit Hydraulic Roller

Camshafts, RPM Range 1,900 – 5,600

513 HP / 496 ft/lb Torque

Intake Valve lift: 0.502
Exhaust Valve Lift: 0.51
Intake Duration @ .050: 224
Exhaust Duration @ .050: 230
Adv. Intake duration 276
Adv. Exhaust duration 282
Lobe separation: 110
Intake centerline 106
Lash Hyd

Cam Bolt Kit: ARP-234-1001

Timing Chain Cover: Milton 65555

Timing Chain: Comp Cams CS Magnum Roller Set 2100, Heavy-duty, heat-treated true double roller timing chain

Cam Thrust Button CompCams

Heads: Top ProLine - Cast Iron

Iron, 23 degree, 64cc chamber, angle plug head

200cc Intake runners
Flow @ .700 Int: 270/ Exh: 195 cfm
Flow @ .600 Int: 263/ Exh: 190 cfm

Springs: CompCams 986-16 Dual Valve Springs: 1.430" O.D. Outer, .697" I.D. Inner
Seat Load: 132 @ 1,750
Open Load: 293 @ 1,250
Coil Bind: 1.150
Rate (Lbs/in.) 322
Valves Precision Engine Parts Stainless Steel 21-4N

Intake Valves: P2470P 2.020

Exhaust Valves P2469P 1.600

Valve Seals Comp Cams

Retainers Comp Cams

Locks:
Spring Locators
Guideplates Comp Cams

Pushrod Comp Cams 7809-16, High Energy Pushrods™: 5/16" Diameter, 7.266" Length
Hydraulic Roller Lifters:

Rocker Arms: Hi-Tech™ Stainless Steel Rocker Arms:

Chevy; 7/16" Stud, 1.6 Ratio
Rocker Studs: 7/16”
Spark Plugs: AutoLite 23’s

Cylinder Head Bolts ARP 134-3701

Head Gaskets: Felpro Z1144061.061 thick version of Z1144

13.9 cc volume

Just because I am so happy about the dyno results I am going to sell a limited number of these for $400 shipped in the US!!! Get them now while they are hot! This is the best bang for the buck header period!



**Small Print** Due to the variances of the C3 Corvettes It is up to the buyer to verify fitment. Some fitting may be necessary depending on the individual application. There is a 5 day return policy, buyer to pay for return shipping and there will be a 30% restocking fee.

pretty good numbers on that motor..good price on those very nice headers...how did the 1 7/8 in affect power in the low to mid-range compared to 1 5/8? was there much drop off? are you making them to fit angle plug heads yet?

pretty good numbers on that motor..good price on those very nice headers...how did the 1 7/8 in affect power in the low to mid-range compared to 1 5/8? was there much drop off? are you making them to fit angle plug heads yet?

You will have to check the dyno sheets I posted.

We are not doing anything with these headers anymore. We are just going to sell what is left in stock and then they are done.

What's left in stock and how much? I've ruled out sidepipes so these appear to be a great replacement for my Hooker Super Comps. Many Thanks :)

What's left in stock and how much? I've ruled out sidepipes so these appear to be a great replacement for my Hooker Super Comps. Many Thanks :)

$400 to your door. :coffeetime: