Summit CK1303 238/248 @ 0.050” lift, .540” lift - Chevelle Tech
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post #1 of 143 (permalink) Old Sep 29th, 18, 6:27 PM Thread Starter
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Summit CK1303 238/248 @ 0.050” lift, .540” lift

Guys,
I think it would be neat if all we shared our results using this budget cam. Kind of a repository for what works and doesn’t work with this cam. Im thinking...

Basics engine specs:
CID
Compression
Heads/valve size/valve springs if known
Rocker arm type and ratio
Intake
Carb, carb spacer
Ignition, timing
Exhaust - manifolds

Results:
Quarter mile time slip (Where? Temperature?)
60’
1/8 and mph
1/4 and mph

Vehicle
Weight
Trans and stall
Gear
HP or calculated HP
Shift points
Idle quality

What did you learn from the build?

Proving every day hindsight is 20/20.
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post #2 of 143 (permalink) Old Sep 29th, 18, 6:41 PM Thread Starter
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I’ll start

Basics engine specs:
468
9.6
781 oval port, 2.19/1.88, Comp 984
Stock peanut port rockers
Old school Weiand high rise dual plane
Holley 750 vac
HEI with MSD, 46 degrees
Stock exhaust manifolds

Results:
13.09 @ 101.9, Norwalk, OH, 60F
60’ 1.84

Vehicle
81 Mailbu wagon
4350
TH350, 3000 stall
3.42
360 calculated RWHP
Shifted at 5500
900 neutral, 750 in gear

What did you learn from the build?
G-body BBC header options are not great. SBCs, especially 400 CID and larger, offer great bang for the buck.
fr8dog likes this.

Proving every day hindsight is 20/20.
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post #3 of 143 (permalink) Old Sep 29th, 18, 11:14 PM
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Jeff
 
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Re: Summit CK1303 238/248 @ 0.050” lift, .540” lift

you can use A body and F body headers on a G body with minimal effort. Just a heads up.

71350SS likes this.

78 Malibu, 402, eddy heads, 174 B&M blower, th350, holley sniper EFI, 9" 3:70, 26X8.50-15 slicks.
69 VW baja 1679cc. stick shift toy.
96 chevy 1500, tow vehicle.
03 yz85 fun bike.
04 scion XB daily driver.
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post #4 of 143 (permalink) Old Sep 29th, 18, 11:25 PM
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Jeff
 
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Re: Summit CK1303 238/248 @ 0.050” lift, .540” lift

that guy above also installed chevelle headers in another video both styles fit with some trimming of the lower a arm mounts and clam shell engine mount being trimmed. the hooker 2455 seams to fit the best of the hooker line, he did not know what brand or part number the chevelle headers were but they fit good as well.

78 Malibu, 402, eddy heads, 174 B&M blower, th350, holley sniper EFI, 9" 3:70, 26X8.50-15 slicks.
69 VW baja 1679cc. stick shift toy.
96 chevy 1500, tow vehicle.
03 yz85 fun bike.
04 scion XB daily driver.
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post #5 of 143 (permalink) Old Sep 30th, 18, 12:19 AM
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Re: Summit CK1303 238/248 @ 0.050” lift, .540” lift

Quote:
Originally Posted by Dragginwagon467 View Post
I’ll start

Basics engine specs:
468
9.6
781 oval port, 2.19/1.88, Comp 984
Stock peanut port rockers
Old school Weiand high rise dual plane
Holley 750 vac
HEI with MSD, 46 degrees
Stock exhaust manifolds

Results:
13.09 @ 101.9, Norwalk, OH, 60F
60’ 1.84

Vehicle
81 Mailbu wagon
4350
TH350, 3000 stall
3.42
360 calculated RWHP
Shifted at 5500
900 neutral, 750 in gear

What did you learn from the build?
G-body BBC header options are not great. SBCs, especially 400 CID and larger, offer great bang for the buck.
Are you sure about 46 degrees of timing?
Steve R likes this.

'69 Chevelle 11 to 1 496 BBC Straub Technologies solid roller. 710HP
Best 60' so far....1.34


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post #6 of 143 (permalink) Old Sep 30th, 18, 1:36 AM
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Jeff
 
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Re: Summit CK1303 238/248 @ 0.050” lift, .540” lift

Quote:
Originally Posted by Pat_McNeil View Post
Are you sure about 46 degrees of timing?
Pat in the other thread he talked about his timing he went from 36 to 46 to see if it picked up any, I think he said he is gonna dial it back to 42 or something.

78 Malibu, 402, eddy heads, 174 B&M blower, th350, holley sniper EFI, 9" 3:70, 26X8.50-15 slicks.
69 VW baja 1679cc. stick shift toy.
96 chevy 1500, tow vehicle.
03 yz85 fun bike.
04 scion XB daily driver.
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post #7 of 143 (permalink) Old Sep 30th, 18, 7:05 AM Thread Starter
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Quote:
Originally Posted by Jebchevelle View Post
you can use A body and F body headers on a G body with minimal effort. Just a heads up.

Quote:
Originally Posted by Jebchevelle View Post
that guy above also installed chevelle headers in another video both styles fit with some trimming of the lower a arm mounts and clam shell engine mount being trimmed. the hooker 2455 seams to fit the best of the hooker line, he did not know what brand or part number the chevelle headers were but they fit good as well.
I must have watched that video 4-5 times before I dropped my engine in, the choice to go manifolds came down to time available to hit the track with my friends. Headers are my next step for sure.

Proving every day hindsight is 20/20.
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post #8 of 143 (permalink) Old Sep 30th, 18, 7:11 AM Thread Starter
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Quote:
Originally Posted by Jebchevelle View Post
Quote:
Originally Posted by Pat_McNeil View Post
Are you sure about 46 degrees of timing?
Pat in the other thread he talked about his timing he went from 36 to 46 to see if it picked up any, I think he said he is gonna dial it back to 42 or something.
The marking on the balancer is very difficult to see through the opening. In fact, you never have a straight shot at the 0 pointer with the timing light. In there area you can see, I saw a “0” on the balancer and assumed it to be “0”, unfortunately it was actually “10”. I dialed back to 34 (that’s what my flattop 406 liked) and I found the 468 is not as happy as at 46. Not that I think the 468 is happy at 46.

Proving every day hindsight is 20/20.
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post #9 of 143 (permalink) Old Sep 30th, 18, 9:44 AM
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Brian
 
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Re: Summit CK1303 238/248 @ 0.050” lift, .540” lift

Quote:
Originally Posted by Dragginwagon467 View Post
The marking on the balancer is very difficult to see through the opening. In fact, you never have a straight shot at the 0 pointer with the timing light. In there area you can see, I saw a “0” on the balancer and assumed it to be “0”, unfortunately it was actually “10”. I dialed back to 34 (that’s what my flattop 406 liked) and I found the 468 is not as happy as at 46. Not that I think the 468 is happy at 46.
For what its worth when I had steel heads on my 427 it liked 40-42 degrees of timing.
Jebchevelle likes this.

66 chevelle
New Combo
555
10.2 comp
Straub ProMaxx heads
Straub solid roller
TH400/373
3815lbs
1.31 60'
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post #10 of 143 (permalink) Old Sep 30th, 18, 10:59 AM
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Eric
 
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Re: Summit CK1303 238/248 @ 0.050” lift, .540” lift

Quote:
Originally Posted by Dragginwagon467 View Post
I’ll start

...
Vehicle
81 Mailbu wagon
4350
How does one get an `81 Malibu wagon to weigh 4350?

Curb weight with a V8 from the factory was ~3400 lbs.

(I have an 83)

1983 Chevrolet (USA) Malibu 3gen Classic Wagon full range specs

Carburetor Rebuild & Restoration
Engine & Driveline Parts & Services

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post #11 of 143 (permalink) Old Sep 30th, 18, 11:03 AM Thread Starter
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Quote:
Originally Posted by B433 View Post
Quote:
Originally Posted by Dragginwagon467 View Post
The marking on the balancer is very difficult to see through the opening. In fact, you never have a straight shot at the 0 pointer with the timing light. In there area you can see, I saw a “0” on the balancer and assumed it to be “0”, unfortunately it was actually “10”. I dialed back to 34 (that’s what my flattop 406 liked) and I found the 468 is not as happy as at 46. Not that I think the 468 is happy at 46.
For what its worth when I had steel heads on my 427 it liked 40-42 degrees of timing.
Exactly my thoughts.

Proving every day hindsight is 20/20.
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post #12 of 143 (permalink) Old Sep 30th, 18, 11:09 AM Thread Starter
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Quote:
Originally Posted by Vintage Musclecar View Post
Quote:
Originally Posted by Dragginwagon467 View Post
I’ll start

...
Vehicle
81 Mailbu wagon
4350
How does one get an `81 Malibu wagon to weigh 4350? <img src="https://www.chevelles.com/forums/images/smilies/confused.gif" border="0" alt="" title="Confused" class="inlineimg" />

Curb weight with a V8 from the factory was ~3400 lbs.

(I have an 83)

1983 Chevrolet (USA) Malibu 3gen Classic Wagon full range specs
I’ve had mine since ‘96, it’s legit.

From my other thread:

The small block had aluminum heads and headers. The big block has cast iron heads and manifolds.

My Dad was in the car (about 190 lbs), I’ve gained about 80 lbs in 12 years (about 340) lol, and I did add a second battery in the rear for traction (about 70 lbs).

That’s 340 of the 550 lbs difference from the small block 3800 lbs race weight with driver. I generally run with at least half a tank of fuel.
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Proving every day hindsight is 20/20.
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post #13 of 143 (permalink) Old Sep 30th, 18, 11:51 AM Thread Starter
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Re: Summit CK1303 238/248 @ 0.050” lift, .540” lift

When thinking about why an aluminum headed SBC wagon weighed 3550 compared to the factory specs, factor in:
1. Dual 3" exhaust
2. Large tires and wheels from stock (15x7 Olds Ralleye wheels with 255/60 in the front, 15x8.5 in the rear with 275/60)
3. Larger rear differential (ever compare an 8.5" from an A-Body and the factory 7.5"?)
4. Driveshaft loop
5. Nitrous system
6. Rear-mounted battery and box, the 00 cable is not lite either
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post #14 of 143 (permalink) Old Sep 30th, 18, 2:59 PM
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Re: Summit CK1303 238/248 @ 0.050” lift, .540” lift

Guys,
I think it would be neat if all we shared our results using this budget cam. Kind of a repository for what works and doesn’t work with this cam. Im thinking...

Basics engine specs:
CID 496
Compression 8.5
Heads/valve size/valve springs if known Dart Merlins (oval)
Rocker arm type and ratio Crane Gold
Intake Eddy Victor
Carb, carb spacer 1100 AED
Ignition, timing MSD
Exhaust - manifolds Headers, fool!

Results:
Quarter mile time slip (Where? Temperature?)
60’ 1.60
1/8 and mph Who gives a ****. A race is 1/4
1/4 and mph [email protected]

Vehicle 71 Monte
Weight 4300 with 3000 watts of loudness. Van Halen, not Van Hagar!
Trans and stall TH350, CrazyDaveys old 3500 stall
Gear 3.73
HP or calculated HP Just a number
Shift points 5200
Idle quality Mean, man.

What did you learn from the build? Racing is expensive.
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OLDED and dragginwagon406 like this.

Couple of junkers and a few clunkers.
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post #15 of 143 (permalink) Old Sep 30th, 18, 5:01 PM
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Re: Summit CK1303 238/248 @ 0.050” lift, .540” lift

Quote:
Originally Posted by Dragginwagon467 View Post
The marking on the balancer is very difficult to see through the opening. In fact, you never have a straight shot at the 0 pointer with the timing light. In there area you can see, I saw a “0” on the balancer and assumed it to be “0”, unfortunately it was actually “10”. I dialed back to 34 (that’s what my flattop 406 liked) and I found the 468 is not as happy as at 46. Not that I think the 468 is happy at 46.
A couple of times in the past, I had a heck of a time trouble shooting tune-up related issues. I now ALWAYS check the balancer. The outer ring of the balancer ( with the timing marks on it) had spun or moved to a point where the timing marks were no longer in the correct position. I simply made my own timing marks using the crank key as my guide. And YES, I should have replaced the balancer. I hear its not pretty when they come apart! Best of luck with your trouble shooting.

'69 Chevelle 11 to 1 496 BBC Straub Technologies solid roller. 710HP
Best 60' so far....1.34


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Steve Sharp Turbo 400
Motivational Engineering 3.73 12 bolt rear.
Chris Alston's complete "Auto - Cross" coil-over suspension.
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