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73 Chevorlet Corvette - CI: 496
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hitchcock



Joined: 28 Dec 2005
Posts: 33
Location: wichita

PostPosted: Sun May 06, 2007 12:57 pm    Post subject: 73 Chevorlet Corvette - CI: 496 Reply with quote

Owner Information
  • Home Town: Wichita
  • Primary Use: street/strip
  • Estimated Investment: 30,000
  • % of Wrenching by Owner: all of it but the machine work on motor
Basic Car InformationBlack
  • Year: 73
  • Make: Chevorlet
  • Model: Corvette
  • Weight: 2900
Proven Performance Information
  • Best ET/MPH: 14.85 with 355
  • Best 60:
  • Performance Rating (5 is best): 1
  • Street Manners Rating (5 is best): 5
Gearhead Information
  • Engine CI: 496
  • Bore: 4.31
  • Stroke: 4.25
  • Block: 454
  • Heads: Canfield 113 cnc chambers
  • Ported? (With flow numbers):gasket match, bowl blend, 347 cfm
  • Crank: scat 9000
  • Rods: cat 6.385
  • Pistons & Rings: SRP 18cc.
  • Cam & Lifters:Comp Solid Rollers Comp 4-7 swap solid roller Int..744 @.050 278 Exh. .714 @.050 288 113 lsa 110 intake center line
  • Intake: Edelbrock Tunnel Ram
  • Distributor/Ignition: MSD 6-AL Pro Billet locked advance, timing Computer
  • Headers: Lemons 2.125 stepped to 2.25
  • Tran & Brake: Th 400
  • Converter: TCI 8" modified by Neal Chance 6000 stall
  • Rear End Gear: 4.86
  • Tire Size: 32x14
  • HP/TQ Number: na
  • Power Adder:N.O.S. Fogger 150 shot(for now)
  • Compression & Fuel Used: 10.5 91 octane
  • Chassis Tricks: 4-link& coil overs
  • Carb: Two Pro systems 950's (
Special Notes
  • I will let you know what happens at the track
Advice Needed I know the cam sounds totally wrong but Comp insisted it is the right grind. Any advice or critism is welcome. Thanks





Last edited by hitchcock on Fri Jul 27, 2012 7:57 pm; edited 9 times in total
 
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Grumpy 427



Joined: 19 Nov 2005
Posts: 154
Location: Regina Sask Canada

PostPosted: Sun May 06, 2007 4:27 pm    Post subject: Reply with quote

I just built a 468 with 12.3-1 compression, and a set of AFR 305 WIth cnc chambers. s mild solid roller cam and 2" headers. A dart intake and mighty demon carb. I made 708 HP and 622 TQ. motor only. I have seen guys here build a mild 496 with protopline 320 heads and make 650/650 . so start comparing midlift numbers from .200-.500 lift. The peak numbers are not what you should base the heads on. I looked at several heads and decided on the AFR due to the fact they had the best overall flow numbers. And best average flow. Very Happy
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A Canadian with an insane street car.

1006 HP 468 BBC on spray
see what the track has to say.

http://i7.photobucket.com/albums/y275/alcohloic/4563.jpg
 
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Grumpy 427



Joined: 19 Nov 2005
Posts: 154
Location: Regina Sask Canada

PostPosted: Sun May 06, 2007 4:32 pm    Post subject: Reply with quote

I just built a 468 with 12.3-1 compression, and a set of AFR 305 WIth cnc chambers. s mild solid roller cam and 2" headers. A dart intake and mighty demon carb. I made 708 HP and 622 TQ. motor only.The motor made power and pulled to 7200 RPM I have seen guys here build a mild 496 with protopline 320 heads and make 650/650 . so start comparing midlift numbers from .200-.500 lift. The peak numbers are not what you should base the heads on. I looked at several heads and decided on the AFR due to the fact they had the best overall flow numbers. And best average flow. Very Happy
_________________
A Canadian with an insane street car.

1006 HP 468 BBC on spray
see what the track has to say.

http://i7.photobucket.com/albums/y275/alcohloic/4563.jpg
 
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hitchcock



Joined: 28 Dec 2005
Posts: 33
Location: wichita

PostPosted: Sun May 06, 2007 5:57 pm    Post subject: Reply with quote

That is the way I was leaning towards the smaller runner size. I figured with the small cross section i should get an easy 625 foot pounds. I need to do some research and decide between the canfields or afr. The afr have more peak flow, but the canfields have a better i/e ratio with a smaller combustion chamber. 110 canfield cnc-and 114 afr cnc As far as intakes is the team g the right choice or should i get a super victor or a brodix? any advice will be great. And what do you have to do to a th-350 to make it live on a motor like this?
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Grumpy 427



Joined: 19 Nov 2005
Posts: 154
Location: Regina Sask Canada

PostPosted: Sun May 06, 2007 11:56 pm    Post subject: Reply with quote

my AFR heads have 122 cc chambers. As far as intakes go? I know many engine builders dont like team g intakes. Go with the Dart or the Brodix?

As far as TH-350. i built one. we put in a bigger intermediate sprag race. A low roller clutch assembly out of a 700R4 wider bearings. Machined the high gear drum for 5 clutches instead of the factory 3. I was told that a th 350 wouldnt stand up to the new power i had so i bought a Coan glide instead of going to a TH-400. I made 10006 HP and 1000 TQ on nitrous so i had to go to a tranny that would take the abuse.
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A Canadian with an insane street car.

1006 HP 468 BBC on spray
see what the track has to say.

http://i7.photobucket.com/albums/y275/alcohloic/4563.jpg
 
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hitchcock



Joined: 28 Dec 2005
Posts: 33
Location: wichita

PostPosted: Mon May 07, 2007 6:18 pm    Post subject: 496 Reply with quote

I will probably just stick witha th 400 then. I have a dart intake but it is a 4150 flange, and I think it has enough plenum volume an adapter would hurt my bottom end.
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Grumpy 427



Joined: 19 Nov 2005
Posts: 154
Location: Regina Sask Canada

PostPosted: Mon May 07, 2007 8:32 pm    Post subject: Reply with quote

My engine builder said a 2 ' blended wilson spacer would pick up the power, but i didnt have the room under the hood for the spacer, so i didnt bother with it on the dyno.
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A Canadian with an insane street car.

1006 HP 468 BBC on spray
see what the track has to say.

http://i7.photobucket.com/albums/y275/alcohloic/4563.jpg
 
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hitchcock



Joined: 28 Dec 2005
Posts: 33
Location: wichita

PostPosted: Wed May 09, 2007 6:38 pm    Post subject: Reply with quote

I think I'm gonna go with the canfields with the 110 cnc chamber and have them angle milled down to a 107 to try and get my compression up a little. Also gonna have them ported a little on the intake side by a shop. I was wondering abot doing a polish on the exhaus myself, is this hard to do? Not wanting to enlarge anything there just smooth it out. Should I, or should I not???
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Grumpy 427



Joined: 19 Nov 2005
Posts: 154
Location: Regina Sask Canada

PostPosted: Thu May 10, 2007 7:18 am    Post subject: Reply with quote

Yeah you can buy some sanding rolls and do it with a 1/2" die grinder, i have done it in the past. You have to be careful if you do the intake ports, not to getthem too smooth. the rough cast to some degree is better to help the furel atomize.
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A Canadian with an insane street car.

1006 HP 468 BBC on spray
see what the track has to say.

http://i7.photobucket.com/albums/y275/alcohloic/4563.jpg
 
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hitchcock



Joined: 28 Dec 2005
Posts: 33
Location: wichita

PostPosted: Thu May 10, 2007 10:21 pm    Post subject: Reply with quote

I won't touch the intake ports. No way, no how. Just dont know enough about it to try and would end up killing a good set of heads. Thats why I hesitate to even do the exhaust ports.
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hitchcock



Joined: 28 Dec 2005
Posts: 33
Location: wichita

PostPosted: Sun Feb 10, 2008 4:33 pm    Post subject: 496 combo Reply with quote

Well the 496 for the vette will be back from the machine shop around the end of feb. I ended up going with the canfield 113 cnc chambers and 310 runners. I had them fully ported by a shop and the cross section came back at a rather large 4.2 inches. (no thats not a mistake) But the head porter and machinist insisted it will be fine, because they cleanly taper down in size. Comp is doing a custom cam, Tim cole from comp is talking about lift between .73-.750 for intake and exhaust, with duration around 265-275@.050. The turbo 400 is outfitted with a brake, and an 8" TCI 5500 converter. I would like something a little tighter, but for now I'm gonna run what I have. We are changing the car over to a 4 link in about a month, instead of ladder bars. It will have 28x10.5 tires, and I'm thinking 4.10 or 4.30 gears. Not sure wich at this time. What do some of you guys think on the gear selection. But the motor is topped with a Team-G intake and the 1150 dominator. Race weight will be about 3500. Any Ideas on wether this will run 10.50 or beetter? Please shoot me any advice you guys can offer as this is a first effort for me. Thanks
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1 quick rs



Joined: 20 Nov 2005
Posts: 45
Location: akron ohio

PostPosted: Mon Feb 11, 2008 4:02 pm    Post subject: Reply with quote

i have a 496 in my car and it went 10.62 at 130 with a tight nos converter and 295 65 15 mt drag raidals and it tips the scales at 3552 with me in it best 60 ft was a 1.51 on the foot brake and that was on pump gas so i am thinking with your setup 9.99 or 10.teens
 
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hitchcock



Joined: 28 Dec 2005
Posts: 33
Location: wichita

PostPosted: Sat Feb 23, 2008 8:46 pm    Post subject: 496 vette Reply with quote

I would be really satisfied with anything under 10.50. I know that out of the box it probably wont do that. Like I said this is a first effort for me so I know it is gonna take a lot of tuning. But with the help of you guys and my dad (who has raced for several years) I think its doable. Turns out I was wrong on the converter. It is a 9 in. that stalls out at 4800 rpm. I think 9's may be a bit of a stretch, but it's real encouraging to hear that. By the way, I have two 427 TALL DECK blocks for sale. Both are unbored and in good shape.
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BLUE66



Joined: 12 Jan 2006
Posts: 17

PostPosted: Sun Feb 24, 2008 7:54 am    Post subject: Reply with quote

Here's a link to my combo.
Similiar 496, afr 305 heads.
http://www.enginecombination.com/viewtopic.php?t=801
_________________
66 Chevelle SS
496ci, Pump gas, no dominator, no spool, no electric fuel pump, no electric water pump, no big tires, full interior.
N/A
6.25 @ 109.5
9.87 @ 134.6
Vid of 9.87...... http://youtu.be/Au6Lq7rH9Ak
Best 60ft. 1.36
 
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hitchcock



Joined: 28 Dec 2005
Posts: 33
Location: wichita

PostPosted: Fri Feb 29, 2008 12:10 am    Post subject: 496 vette Reply with quote

Well, the machine shop called and got my cam grind in. And to say I was suprised is an understatement. After I was told what the specs were my jaw dropped and I reminded the machinist it was a pump gas motor and his response was "thats what I told comp cams and this is what they said to use" He has been working with Tim Cole from Comp Cams who is in the R&D department now, and a seasoned super stock racer. Tim told my engine builder(steve) that my skepticism would end when I drove the car, and this cam would exceed my needs and be fine for a 10.75:1 motor. Oh, well if it's not fast at least it will sound good. So here it is...
4/7 swap solid roller
Intake Exhaust
Lobe lift .470 .435
Valve Lift .775 .735
Duration @.050 281 294
Lobe Sep Angel 114

I dont remember what the intake centerline was I will find out and update you.
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