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Post Info TOPIC: Intake swap surprises!


A Poncho Legend!

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Intake swap surprises!


We can file this under "things that never go as planned"

I've been working on my intake swap from 2bbl to 4bbl for about a week now in my spare time. Yes, a week but most of that time has been stripping and painting all the related parts so that everything will be pretty when finished. First I had decided to go with a cast iron '69 intake with a '72 Rochester. Closer examination of the Rochester revealed that it's pretty much junk so I opted for plan B- An Edelbrock intake with a 600 Holley (new).

1st problem: A stripped stud hole in the intake. Fixed.

2nd problem: I remove the thermostat housing from the 2bbl intake and... there's no thermostat! I buy new Tstat. Fixed? We'll see...

3rd problem: I just realized this carb is dual feed. I price out correct dual feed line from Holley at my local Carquest (for some reason this takes a non-common feed line). After picking myself off the floor after getting a price quote (trade pricing no less!) I take a deep breath and hand over my credit card. 2 days later it arrives in a package covered in dust. Fixed.

4th problem: The carb doesn't clear the screw in vacuum fitting for my power brakes and transmission. Nothing a little shave with a Dremel can't rectify. Fixed.

5th problem: I set rags into the valley while I cleaned the gasket surfaces. That went well. I removed the rags and shone my trouble light into the valley to check for debris. I get a knot in my stomach. There, sitting in the valley are the remains of two pushrods! What the..!!??. A closer look shows a lifter retainer also sitting in the valley. I quickly check all the pushrods and notice 3 are shiny while the others are well aged. One of them is sitting in a lifter with a crooked cap. Now I know where that retainer came from! This one is #2 intake. I was shocked as the car ran well. All spark plugs look fine. I call Ken (a member on here) who bought the car from the original owner. He had two pushrods fail and another bend. He replaced the pushrods and never had a problem. I call a good friend who is a fantastic tech. His advice: replace the lifters. They could be collapsed causing excessive pushrod movement. Funny I never heard any ticking. "Don't take chances. They are cheap" he says. So.. to be on the safe side I'm going to try to find a set tomorrow. The parts stores here in town are closed so I hope there's a set to be found in London.

I'm still trying to figure out why the t-stat was removed....
The saga will continue...


Todd

-- Edited by 69Laurentian at 23:13, 2008-05-16

-- Edited by 69Laurentian at 23:15, 2008-05-16

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Todd
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have a good look at the pushrod ball socket on the under side of the rocker arms todd.

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Canadian Poncho Superstar!

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Well the good news is just about everything that could go wrong did, so it should be clear sailing after the lifters.

.

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Ray White, Toronto ON

1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Polo green metallic & tan  - Bowling Green Kentucky 






A Poncho Legend!

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I checked that out Dave and it looks ok.

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A Poncho Legend!

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Possibly had stuck thermostat at some point and someone removed it in a pinch.

I would check all the pushrods right away too. It's cheaper and easier to replace them now if necessary.

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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"



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It gets even better:
 All 16 lifters were a BEAR to remove. Most of them are junk:
HPIM0558.jpg
HPIM0558.jpg
My photo isn't great but alot of them are concave. Next I get my flashlight out and check the cam lobes-junk! ARGH! Looks like this puppy was revved way to high at some point. Well, I might as well step up to a performance cam, lifters and new pushrods. Of course, being a long weekend, none of the performance shops in my area are open. I figured I might as well remove the old cam. All goes fairly well until I try to pull the cam. It moves about an inch and that's it. It will not budge forwards OR backwards. I figured a journal is stuck but it ain't moving:
HPIM0562.jpg

If I turn it it doesn't sound very nice. I tried for half an hour and gave up. furious
I'm this close to saying "screw it" and stepping up my efforts to drop a big block in the car!


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todd, get some GM 'CLEENS' or similar, spray it on the cam journals. probably has a buildup of carbon. work the cam back and forth, should come out.

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Maybe the fuel pump pushrod is catching a cam lobe. Try removing the pump.

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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"



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yep...just noticed the fuel pump hasn't been removed yet...

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A Poncho Legend!

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Geez! That's gotta be it. I took a break away from the car today. I'll remove the fuel pump tomorrow. DUH! I feel so stupid! Thanks Carl!


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A Poncho Legend!

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Say thanks when my solution works!!!

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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"



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Thanks!
Yup, that was the problem. The cam has been liberated from the engine. I spent most of the day cleaning things up in preparation for the cam this Tuesday. Watch this thread for more fun and excitment!
Todd


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A Poncho Legend!

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69Laurentian wrote:

Thanks!
Yup, that was the problem. The cam has been liberated from the engine. I spent most of the day cleaning things up in preparation for the cam this Tuesday. Watch this thread for more fun and excitment!
Todd



Excellent! I mean that you got it out, not that you are having trouble!

We can hardly wait!

 



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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"



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Before I go cam shopping, does anyone have any recommendations for a profile?

The car weighs about 3990lbs

Rear axle (for now) has 2.73 gears

Engine is stock except for an Edelbrock Performer dual plane intake with a 600 vac secondary Holley.

Still running manifolds

Dual exhaust with turbo style mufflers

Trans is THM350 stock

Ignition is later HEI

I'd like a bit of a lump to it (enough to notice it isn't stock)

Thanks
Todd



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327/350hp cam and lifter kit still available from gm. had this in my '61 impala, 350 w/350 trans. Qjet, stock manifolds, duals, 3.08 gear, little bit of a lope. biggrin

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I've had a few of those too. Very nice cam. Not too much cam, makes itself known at idle, makes good power as high as you'd want to turn a stock 350 bottom end. It may be just a bit much cam for the 2.73 gears off idle, but it's likely the choice I'd make. Do you get a good shake on GM parts at work Todd?

There is also a good selection of aftermarket duplicates out there of that cam as well. I have one of those to go in my 327 Acadian engine.



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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"



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That would have to be on the all star team of Chevy small block cams. 



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Ray White, Toronto ON

1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Polo green metallic & tan  - Bowling Green Kentucky 






A Poncho Legend!

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I ran the Speed Pro version of it in my 66 Nova SS 327 4 speed with 3.73 gears. Stock engine otherwise with an L79 intake and a Holley, stock manifolds and exhaust. The car was no screamer by todays standards but this was 20 years ago and the 1/4 mile speeds were around 97 mph. It felt like would have turned a lot more rpm than the 6 grand or so that I turned it.

I also had a GM version of that cam in my first 66 Grande Parisienne with a turbo 400 and 2.73 gears. It was a stock 327 except for 11 to 1 pistons and the GM L79 cam. No screamer from a dead stop, but like Todd's car, it was heavy. The car had A/C and every power option known to man. I never weighed it with the 327 but when I put a 427 in it later it weighed it at 4650. That likely put it somewhere around 4300-4400 with the small block.

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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"



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Thanks for the info guys. That sounds like what I am looking for.


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gm pn 12364050 for the 327/350hp cam and lifters. pretty sure it's made by crane.

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I agree with you. When I got my Ram Air IV cam kit for my 455 from GM a few years ago, there was paperwork in the box showing the shipment from Crane to General Motors. I'm fine with that because they had a very good price on the kit.

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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"



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Do either of you have the specs on that cam?


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A Poncho Legend!

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This is the specs listed for the GM cam kit Dave gave the part number for.


Single pattern, blueprinted replacement for factory P/N 3863151 with 350 hp and 327 cu. in. camshaft.

Technical Notes: Basic rpm range is 2200 - 5200; cruise rpm at 60 mph is 3000 - 3400 and compression ratio is 9.5 - 10.75. The duration at .050 lift (intake/exhaust) is 222/222 degrees, and the valve lift is .447"/.447". Lobe centerline is 114. This camshaft kit is designed and manufactured by Crane Cam Co.&reg. It contains one camshaft and 16 tappets.

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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"



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Todd, you mentioned once that you had the Chevrolet Power manual. In that book there is a cam chart for a small block build up. It shows the original part number and specifications for a number of performance cams used in sbc performance motors . L-69, l-79, L-83, Z-28, LT-1 , L-82 are listed. The only cam with higher lift than the L-79 is the one used in the Z-28, LT-1 & L-82.

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Ray White, Toronto ON

1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Polo green metallic & tan  - Bowling Green Kentucky 






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the lift on the L79 cam will work with the original v/springs. was a consideration when i bought it for my '73 350 in my '61. 

-- Edited by 69 belair at 12:21, 2008-05-19

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