Forged Piston Opinions... - Page 3 - Chevelle Tech
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post #31 of 67 (permalink) Old Oct 14th, 19, 11:59 AM Thread Starter
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Re: Forged Piston Opinions...

Quote:
Originally Posted by Jebchevelle View Post
Seams test fitting, indexing spark plugs and bench fitting could have solved a lot of your problems right from the start. That and as already said the upgrading to better gaskets and balancer from the start. The broken valve springs means the valve train was not happy and the springs where most likely not right for the camshaft. The other thing is what block was used? is it a one piece rear seal block? those are internal balance in front and external in the rear and most times the balancer and fly wheel or flex plate are balanced with the rotating assembly because nothing is ever right off the shelf. This is why good builders blue print the engine and test fit more then once, plus double check the specs and verify every part they are using. Hence why some builds take longer then others, attention to detail. just my 2 cents.
Indexing the spark plugs would not have helped at all. The spark plug holes were machined too deep into the head (where the plug gasket sits) - 1/2 of the plug threads were exposed in the combustion chamber. The Dart heads that I have on there now do not have threads exposed (using the same spark plugs). The rotating assembly was balanced - never had any issues with that.
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post #32 of 67 (permalink) Old Oct 14th, 19, 8:31 PM
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Re: Forged Piston Opinions...

Quote:
Originally Posted by WakkoWarner View Post
Indexing the spark plugs would not have helped at all. The spark plug holes were machined too deep into the head (where the plug gasket sits) - 1/2 of the plug threads were exposed in the combustion chamber. The Dart heads that I have on there now do not have threads exposed (using the same spark plugs). The rotating assembly was balanced - never had any issues with that.

Actually yes it would have, while you had the heads off to change gaskets, it would have been a great time to index the plugs while you could see exactly what was going on and you would have known you had exposed threads, then you could have gotten shorter plugs that would not have stuck out into the cylinder and then you would not have had carbon build up strip out the threads.

But I digress, and hope it all goes well for you once it is back together again.
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post #33 of 67 (permalink) Old Oct 14th, 19, 9:54 PM
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Re: Forged Piston Opinions...

I think the only reason he pulled the heads was when he tried changing plugs the threads pulled out?


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post #34 of 67 (permalink) Old Oct 14th, 19, 10:00 PM Thread Starter
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Re: Forged Piston Opinions...

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Originally Posted by shovelrick View Post
I think the only reason he pulled the heads was when he tried changing plugs the threads pulled out?
That is correct. I had no idea that there was a problem until that happened. I did have the heads off one time to do the head gaskets, but that was very early on (less than 8,000 miles on the engine). The new heads have actually been on the engine for about 4.5 years now.
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post #35 of 67 (permalink) Old Oct 14th, 19, 10:10 PM
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Re: Forged Piston Opinions...

Have run TRW forged pistons in my toy motor since the 80's. They rev fine, they have stood up to oops overheating due to broken radiator hoses, went 100k on the street, sat under the bench for five years, came out and have dozens of passes and a good bit of spray. With plain old rings.
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post #36 of 67 (permalink) Old Oct 14th, 19, 10:46 PM
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Re: Forged Piston Opinions...

CP pistons for me. Their Bullet series are very cost effective and all forged 2618 alloy.
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post #37 of 67 (permalink) Old Oct 15th, 19, 7:40 PM
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Re: Forged Piston Opinions...

Forgot to add that my new toy motor has forged CP pistons. They have the required larger valve reliefs for the new heads. I have had two successful motors with forged TRW L2482Fs. The price dif is not worth it on a performance engine.

That said, both engines in the Chevelle are bottom of the line Sealed Power cast.
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post #38 of 67 (permalink) Old Oct 16th, 19, 6:12 PM Thread Starter
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Re: Forged Piston Opinions...

I dropped the engine off to Tom this morning. He recommended new pistons, so I am ordering the Autotec forged pistons from Mike Lewis. I just ordered the new camshaft, rocker arms, rocker arm studs, and lifters from Chris Straub. The cam will be ground on a 110° centerline. I am hoping that I can get close to the 500 HP mark (Straub's shop built a 383 @ 10:1, with one of these camshafts and it made 515 HP and 530 pound feet. If I can be close to 500-500, then it will be a good day.

Once the engine is torn down, then we will know if my block, crank, and rods are okay. Tom is going to see why the original builder recommended 6 quarts of oil, when the pan appears to be stock capacity (the pan is this one: https://www.champpans.com/products/p/cp40rb/ ). I will have to order the assorted gaskets and bearings once he determines the sizes needed.

I will be happy if the engine runs better and doesn't leak. Oil leaks are just so annoying.

1971 Malibu, factory buckets/full gauges/console, 377 roller cammed small block, Turbo 400, 3.42 10 bolt posi (Buick), - All your base are belong to us.
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post #39 of 67 (permalink) Old Oct 16th, 19, 7:17 PM
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Re: Forged Piston Opinions...

Quote:
Originally Posted by WakkoWarner View Post
If I can be close to 500-500, then it will be a good day.
FWIW, 480/480 with no leaks, smooth running, and zero issues is hard to beat. Best of luck!!!
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post #40 of 67 (permalink) Old Oct 16th, 19, 11:13 PM
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Re: Forged Piston Opinions...

Have Tom fix you up with a Qjet while you're at it.

Jim

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post #41 of 67 (permalink) Old Oct 16th, 19, 11:16 PM Thread Starter
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Re: Forged Piston Opinions...

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Originally Posted by 77 cruiser View Post
Have Tom fix you up with a Qjet while you're at it.
I don't have a Quadrajet intake and I don't want to run an adapter. He is going to go through my Speed Demon and see if he can figure out what is wrong with it (it felt like the secondaries were not opening). I ordered a Quick Fuel adjustable vacuum pod and it is being shipped to him.
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post #42 of 67 (permalink) Old Oct 17th, 19, 12:44 AM
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Re: Forged Piston Opinions...

Quote:
Originally Posted by WakkoWarner View Post
I dropped the engine off to Tom this morning. He recommended new pistons, so I am ordering the Autotec forged pistons from Mike Lewis. I just ordered the new camshaft, rocker arms, rocker arm studs, and lifters from Chris Straub. The cam will be ground on a 110° centerline. I am hoping that I can get close to the 500 HP mark (Straub's shop built a 383 @ 10:1, with one of these camshafts and it made 515 HP and 530 pound feet. If I can be close to 500-500, then it will be a good day.

Once the engine is torn down, then we will know if my block, crank, and rods are okay. Tom is going to see why the original builder recommended 6 quarts of oil, when the pan appears to be stock capacity (the pan is this one: https://www.champpans.com/products/p/cp40rb/ ). I will have to order the assorted gaskets and bearings once he determines the sizes needed.

I will be happy if the engine runs better and doesn't leak. Oil leaks are just so annoying.
Too much oil maybe a reason why it leaked?
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post #43 of 67 (permalink) Old Oct 17th, 19, 12:08 PM
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Re: Forged Piston Opinions...

Quote:
Originally Posted by WakkoWarner View Post
I don't have a Quadrajet intake and I don't want to run an adapter. He is going to go through my Speed Demon and see if he can figure out what is wrong with it (it felt like the secondaries were not opening). I ordered a Quick Fuel adjustable vacuum pod and it is being shipped to him.
I'm happy to share my Street Avenger 770 settings with you......that you can use as a starting point and then adjust for altitude.

That carb and a 3310 work great on these motors, IMHO.

'69 Malibu 383/TCI TH350/8.2 3.36 Eaton Posi. Street Edge 10" 2800, E-Tec 170s, Custom Mike Jones HR Cam, RPM Air-Gap, StreetAvenger 770, Pertronix HEI, Hedman 1 5/8" Headers, Moser Axles, PMT 1320R Kit. [email protected] 111 MPH, 1.6865 60 ft, Nitto 555
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post #44 of 67 (permalink) Old Oct 17th, 19, 12:30 PM Thread Starter
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Re: Forged Piston Opinions...

Quote:
Originally Posted by blue_69_malibu View Post
I'm happy to share my Street Avenger 770 settings with you......that you can use as a starting point and then adjust for altitude.

That carb and a 3310 work great on these motors, IMHO.
Thanks. The Speed Demon used to pull very hard, but something changed. We'll see what Tom says about it once he gets it apart.
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1971 Malibu, factory buckets/full gauges/console, 377 roller cammed small block, Turbo 400, 3.42 10 bolt posi (Buick), - All your base are belong to us.
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post #45 of 67 (permalink) Old Oct 28th, 19, 12:20 AM Thread Starter
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Re: Forged Piston Opinions...

I heard from Tom today. The oil pump pickup had indeed come off. It was not welded, nor did it have a retaining bracket installed. It somehow got all beat up by the crank shaft. However, the block, crank, and rods are all okay. I just ordered almost everything needed to put it all back together (Clevite crank, rod, and cam bearings, Fel Pro 1010 head/intake gaskets, etc.). The block is at the machine shop right now, and the pistons are scheduled to arrive tomorrow. If all goes well, I can have this thing back together before the end of November.

1971 Malibu, factory buckets/full gauges/console, 377 roller cammed small block, Turbo 400, 3.42 10 bolt posi (Buick), - All your base are belong to us.
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