I have the original motor out of my chevelle. It has 10-12k on a 17 year old rebuild. I pulled it apart to check it and found the number 8 piston scored. The cylinder will clean up but the piston needs to be replaced. It is a 30 over TRW L3022F any idea where I might find one, they appear to have been discontinued. I don't really want to replace the entire set.
Where to get L3022F piston.
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That's a really old number, I couldn't come up with a seller.
However, I believe you can use a L2256F instead, a newer number. It's the same piston as far as specs go except you'll have to compare weights on them after you have one of each in your hands.
Somebody might have an old enough TRW/SP book to find weight info on the L3022F.
How bad is that piston scored? can you put up a pic somewhere?
However, I believe you can use a L2256F instead, a newer number. It's the same piston as far as specs go except you'll have to compare weights on them after you have one of each in your hands.
Somebody might have an old enough TRW/SP book to find weight info on the L3022F.
How bad is that piston scored? can you put up a pic somewhere?
looks like the 2256F is about 600 grams. Widely varying prices out there. Northern has them for about $31 per but in sets of 8. probably find somebody selling one at a time for $35 - $40
see http://www.naparts.com/ProductModelDetail.cfm?ProductModelId=15113
see http://www.naparts.com/ProductModelDetail.cfm?ProductModelId=15113
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((It is a 30 over TRW L3022F))
That is a forged not a cast.
Tom
That is a forged not a cast.
Tom
Just to (help) set the record "straight" here and sort of confirm Bill K's call, not that it's needed, it is a "cast" piece!
The L3000F series in TRW's (older) line were all cast pieces, NOT forged.
The "F" in the part number in TRW's earlier days didn't signify it as a "forged" piece. This all changed in the later years!
They (TRW) originally had numbers such as L500F/L1300F, L2000CF, and the L3000F. These were all "cast" pieces.
(O/T) Someone I'm familiar with ordered some GMC "401" pistons recently, assuming they were for the "Nailhead" Buick. When they arrived he had 6 pistons for the "401" GMC (V-6). The "GMC" should have been a clue!
Thanks, Gary in N.Y.
P.S. This all gets somewhat confusing over the years. Moreso when companies change hands numerous times!
The L3000F series in TRW's (older) line were all cast pieces, NOT forged.
The "F" in the part number in TRW's earlier days didn't signify it as a "forged" piece. This all changed in the later years!
They (TRW) originally had numbers such as L500F/L1300F, L2000CF, and the L3000F. These were all "cast" pieces.
(O/T) Someone I'm familiar with ordered some GMC "401" pistons recently, assuming they were for the "Nailhead" Buick. When they arrived he had 6 pistons for the "401" GMC (V-6). The "GMC" should have been a clue!
Thanks, Gary in N.Y.
P.S. This all gets somewhat confusing over the years. Moreso when companies change hands numerous times!
here is a pic of the top of the piston.
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They would have been purchased in 91 the only info I can find on them says they are forged.
I am going to run a set of vortec heads. Should I just replace them all with a lower compression piston to run on pump gas?
They would have been purchased in 91 the only info I can find on them says they are forged.
I am going to run a set of vortec heads. Should I just replace them all with a lower compression piston to run on pump gas?
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Depending on the rest of the combo you should be able to run flat tops and vortec heads on pump gas, unless you want to run 87 octane. (which is understandable considering the price of gas LOL)
Is that piston collapsed or just has the scuff marks on the skirt. They can be "groomed" with some scotch bright if the rest of the piston is in good shape and you want to save some cash. There are several cast replacement pistons you can use, but they need to be similar in compression height, skirt tip length, and most importantly, weight. Weight is the single biggest PITA for an engine builder when balancing isn't in the customer's budget. 20 to 25 grams is my limit for weight difference between old and new for a SET. I wouldn't allow that much difference for a single piston unless the customer was doing a patch job and didn't care about the outcome. It is very common for new pistons to be 50 to 75 grams different from the factory pistons. I've ordered 3 different brands at times to find a suitable piston weight and in the end I had to balance rather than risk a vibration.
Is that piston collapsed or just has the scuff marks on the skirt. They can be "groomed" with some scotch bright if the rest of the piston is in good shape and you want to save some cash. There are several cast replacement pistons you can use, but they need to be similar in compression height, skirt tip length, and most importantly, weight. Weight is the single biggest PITA for an engine builder when balancing isn't in the customer's budget. 20 to 25 grams is my limit for weight difference between old and new for a SET. I wouldn't allow that much difference for a single piston unless the customer was doing a patch job and didn't care about the outcome. It is very common for new pistons to be 50 to 75 grams different from the factory pistons. I've ordered 3 different brands at times to find a suitable piston weight and in the end I had to balance rather than risk a vibration.
Shep,
That is NOT a forged piston I assure you. Any good stock replacement piston will work fine as long as the weight is pretty close. I am pretty sure the latest Sealed Power number is 345NP or H345NP if yo want a hypereutectic one. You need to take it to your machine shop and have them weigh it for you to see.
If you look at the pic below, the red arrow is pointing to the side of the piston. The "texture" at that point is what gives it up as a cast piston. Any good machine shop should be able to get you a single replacement piston.
That is NOT a forged piston I assure you. Any good stock replacement piston will work fine as long as the weight is pretty close. I am pretty sure the latest Sealed Power number is 345NP or H345NP if yo want a hypereutectic one. You need to take it to your machine shop and have them weigh it for you to see.
If you look at the pic below, the red arrow is pointing to the side of the piston. The "texture" at that point is what gives it up as a cast piston. Any good machine shop should be able to get you a single replacement piston.
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Brad can you snap a shot of the bottom up inside were the wrist pin is? Can you see two lines or what looks like three parts of the pistion if so its cast. If its all smooth its forged.
Tom
Tom
I was going by the information I could find with by looking up the part number on the Internet. From what you are telling me to look for and what I am seeing they are cast.
The rest of the piston is in good shape but the scoring is fairly deep. I ran a file over it and it looks like I will need to remove 5-10 thousandths to get it all.
Is hyperutetic better than cast?
The rest of the piston is in good shape but the scoring is fairly deep. I ran a file over it and it looks like I will need to remove 5-10 thousandths to get it all.
Is hyperutetic better than cast?
Brad,
Hypereutectic is actually cast, but a slightly better material. The problem is that most of the Hyper pistons are a lot lighter than the plain cast ones. Just do yourself a favor and take the piston to your machine shop, have them take it off the rod and weigh it, then order you a correct replacement. Its really about the most simple thing to do.
Tom ..... I am looking at a 1979 TRW piston catalog and it shows an L3022F being a cast replacement piston. Anyone that works on engine parts all day can look at that piston and see that it is cast.
Hypereutectic is actually cast, but a slightly better material. The problem is that most of the Hyper pistons are a lot lighter than the plain cast ones. Just do yourself a favor and take the piston to your machine shop, have them take it off the rod and weigh it, then order you a correct replacement. Its really about the most simple thing to do.
Tom ..... I am looking at a 1979 TRW piston catalog and it shows an L3022F being a cast replacement piston. Anyone that works on engine parts all day can look at that piston and see that it is cast.
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Bill.... We all know old ads and print are not alway's right. Hell even new ads are misprinted every day. All I can say is look at the bottom of the piston and make sure. What Gary posted was the first I have ever herd of this and I can't say if it's true all I have is his word. If it is it is, if it aint well it aint. Heck Google the part number. All the results come up Forged.
But lets not lead this guy down the wrong path and wait for his pic then we all will no.
Tom
Tom,
Look at my modified picture of the piston with the red arrow pointing to the side of the piston. Forged pistons do not have that pattern on the side of the piston. It is cast, believe me. A picture of the underside will confirm it. If you have seen as many pistons as I have in the last 30 years, you would agree
Look at my modified picture of the piston with the red arrow pointing to the side of the piston. Forged pistons do not have that pattern on the side of the piston. It is cast, believe me. A picture of the underside will confirm it. If you have seen as many pistons as I have in the last 30 years, you would agree
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Bill
I'm not trying to argue with you. If it is great. All I have is my short experiance with TRW stuff back in the mid to late 70's. Most all of my builds since have used Weisco, JE, Diamond, Mahl, and CP. TRW's are way to heavy for my stuff.
Tom
I'm not trying to argue with you. If it is great. All I have is my short experiance with TRW stuff back in the mid to late 70's. Most all of my builds since have used Weisco, JE, Diamond, Mahl, and CP. TRW's are way to heavy for my stuff.
Tom
Hi Tom, "tough" audience up here sometimes, let's approach it from another angle!
I'll place a photo here of a listing in a "new" (at least to me) 1989 TRW "Performance Components" catalog #X-3009. It may be hard to read due to the camera, but I believe you'll get it!
Thanks, Gary in N.Y.
P.S. I have some numbers AND catalogs from some of these manufacturers back to 1959/1960 at the shop, but I have these "new" catalogs available in my office for doing "estimating"/research in these evenings!
G
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·"If you look at the pic below, the red arrow is pointing to the side of the piston. The "texture" at that point is what gives it up as a cast piston."
Imho, it's a cast piston.
If I wasn't so lazy, I bet I can find it in one of my WAY old parts cats...
pdq67
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
Imho, it's a cast piston.
If I wasn't so lazy, I bet I can find it in one of my WAY old parts cats...
pdq67
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
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512 Posts
so i have the same pistons what is the correct answer is it cast or forged?
if i have it in my motor with a set of 64 cc heads that i have put
202 valves in hardened seats and guide plates could you tell
me what compreshion i would have? the heads are refered to as
camel humps and say i believe 461 on the inside
if i have it in my motor with a set of 64 cc heads that i have put
202 valves in hardened seats and guide plates could you tell
me what compreshion i would have? the heads are refered to as
camel humps and say i believe 461 on the inside
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257 Posts
This is your answer, but take a picture of the underside and post it up and you'll know 100% whether it's cast or forged. Your compression ratio would be in the 10-1 range, depending on bore oversize, head gasket thickness, etc.Tom,
Look at my modified picture of the piston with the red arrow pointing to the side of the piston. Forged pistons do not have that pattern on the side of the piston. It is cast, believe me. A picture of the underside will confirm it. If you have seen as many pistons as I have in the last 30 years, you would agree
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