Rotating Assembly Mystery - Team Camaro Tech
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post #1 of 14 (permalink) Old Jan 30th, 10, 12:10 PM Thread Starter
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Gary
 
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Rotating Assembly Mystery

Guys....I know I'm not giving you much info here, but what's everyone's guess as to the internal specs of this motor. The pistons feel like they are a dish style. I never took the heads off but they are 461 castings. The underside of each piston had Sharpie markings...1 through 8. I know it's a 350, 1977ish, 2pc main block. Also, any guesses on the the horsepower I should be expecting? It has headers, 2 1/2" Flowmasters, Holley 670 SA, no-name polished hi-rise, Comp Thumper(479/465 lift), Perteronix Ign, M20, 3.42 12-Bolt. Thanks

Gary

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post #2 of 14 (permalink) Old Jan 30th, 10, 12:39 PM
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Re: Rotating Assembly Mystery

one would need to know what pistons you have and the cam specs to estimate HP. Sorry
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post #3 of 14 (permalink) Old Jan 30th, 10, 04:31 PM
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Re: Rotating Assembly Mystery

No, but I can tell you that in your 2nd pic the engine was about 30 or so btdc #1.

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post #4 of 14 (permalink) Old Jan 30th, 10, 04:35 PM
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Re: Rotating Assembly Mystery

Looks stock to me

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post #5 of 14 (permalink) Old Jan 30th, 10, 04:38 PM
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Re: Rotating Assembly Mystery

Cast crank, and pistons.
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post #6 of 14 (permalink) Old Jan 30th, 10, 04:40 PM
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Re: Rotating Assembly Mystery

I agree Bill, and I can't see that any rods have ever been balanced. Can't see the parting line on the crank either. The 1 piston skirt you can see looks good.

Tim Smith
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post #7 of 14 (permalink) Old Jan 30th, 10, 06:24 PM
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Re: Rotating Assembly Mystery

Tim,
If you look at the counterweights on the far right in the picture you can see the parting lines, definitely a cast crank.

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post #8 of 14 (permalink) Old Jan 30th, 10, 06:46 PM
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Re: Rotating Assembly Mystery

Quote:
Originally Posted by Gar's67 View Post
Guys....I know I'm not giving you much info here, but what's everyone's guess as to the internal specs of this motor. The pistons feel like they are a dish style. I never took the heads off but they are 461 castings. The underside of each piston had Sharpie markings...1 through 8. I know it's a 350, 1977ish, 2pc main block. Also, any guesses on the the horsepower I should be expecting? It has headers, 2 1/2" Flowmasters, Holley 670 SA, no-name polished hi-rise, Comp Thumper(479/465 lift), Perteronix Ign, M20, 3.42 12-Bolt. Thanks
Looks like cast crank and stock or stock style pistons, stock rods too

Are they 461 or 461X heads?


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post #9 of 14 (permalink) Old Jan 30th, 10, 07:16 PM
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Re: Rotating Assembly Mystery

Stock motor and pistons I would assume - and a little bit of cam - maybe 350 -375hp.

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post #10 of 14 (permalink) Old Jan 30th, 10, 07:18 PM Thread Starter
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Re: Rotating Assembly Mystery

461 for sure...no "X"

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post #11 of 14 (permalink) Old Jan 31st, 10, 03:48 PM
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Re: Rotating Assembly Mystery

Unless someone swapped the pistons, they are probably dish. Let me ask you this, how well does it run on 87 octane? If ok, that would rule out a real high comp motor. If this is a stock 77ish, that would make you somewhere around 7.6:1 static, using stock internals. Not good at all. We all know in 71 they went from high to low compression. My stock 71 350 has a dish piston and a 76cc open chamber combustion chamber that makes around 7.6:1 static compression. Now, if someone changed the pistons, it's impossible to tell. That cam is way too big, IMO. That combined with the not so hot rear end ratio makes for a pig off the line. I used CamQuest and going with a 62cc chamber 2.02/1.6 valve head, high rise high flow intake, dual exhaust w/mufflers and no cats, 18cc dish piston, .039" thick head gasket, cylinder bore of 4.000", gasket bore of 4.125", stock deck height of .025", stroke of 3.48, an intake valve closing of 50*ABDC and that got me a static ratio of 8.6:1. I got a peak hp of 334 and a peak torque of 365. This is at the flywheel so take away about 33hp and 36ftlbs. if you use a drivetrane loss of 10%. If you use a loss of 15%, take away 50hp and 55ftlbs. Much better than if you would have an auto tranny.

IMO, that cam is too much for those heads. Not to mention that cam technology is made for newer design heads. If you would switch to something like the L-79 cam or maybe the 30-30, you would get better results. IMO, you are combining 2 different design eras. Either switch to newer heads or an older designed cam.

Charlie Knudsen 67 Camaro RS/SS 350 TKO 600, 4.10's, AFR 195 Street Heads, Comp 270H, Rhoads Lifters, Crane Ignition, Pertronix Dizzy, Performer RPM Q-Jet, Heavily Modified Q-Jet, Hooker Comp Headers, MagnaFlow 2 1/2", 144 Decibles(Alpine CDA-7998 Head Unit, RF X7 and RF 750X Amps, MB Quart Mid's & High's, Kicker L7 12" Solo Barics)
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post #12 of 14 (permalink) Old Jan 31st, 10, 03:54 PM
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Re: Rotating Assembly Mystery

According to Chevy-Camaro.com, that block is 77-79, 2 or 4 bolt main and UP TO 225hp. Used in Corvettes and others.

Charlie Knudsen 67 Camaro RS/SS 350 TKO 600, 4.10's, AFR 195 Street Heads, Comp 270H, Rhoads Lifters, Crane Ignition, Pertronix Dizzy, Performer RPM Q-Jet, Heavily Modified Q-Jet, Hooker Comp Headers, MagnaFlow 2 1/2", 144 Decibles(Alpine CDA-7998 Head Unit, RF X7 and RF 750X Amps, MB Quart Mid's & High's, Kicker L7 12" Solo Barics)
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post #13 of 14 (permalink) Old Jan 31st, 10, 06:36 PM
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Re: Rotating Assembly Mystery

Quote:
Originally Posted by 67CamaroRS/SS View Post
According to Chevy-Camaro.com, that block is 77-79, 2 or 4 bolt main and UP TO 225hp. Used in Corvettes and others.
That block was never used in any Corvette.

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post #14 of 14 (permalink) Old Feb 1st, 10, 07:27 AM
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Charlie
 
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Re: Rotating Assembly Mystery

Then Chevy-Camaro.com is wrong.

Charlie Knudsen 67 Camaro RS/SS 350 TKO 600, 4.10's, AFR 195 Street Heads, Comp 270H, Rhoads Lifters, Crane Ignition, Pertronix Dizzy, Performer RPM Q-Jet, Heavily Modified Q-Jet, Hooker Comp Headers, MagnaFlow 2 1/2", 144 Decibles(Alpine CDA-7998 Head Unit, RF X7 and RF 750X Amps, MB Quart Mid's & High's, Kicker L7 12" Solo Barics)
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