diff --git a/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/EngineNewPayloadV3Test.java b/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/EngineNewPayloadV3Test.java
index 0f6d6c2b1bc..9b92221e65a 100644
--- a/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/EngineNewPayloadV3Test.java
+++ b/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/EngineNewPayloadV3Test.java
@@ -52,7 +52,6 @@
 import org.hyperledger.besu.ethereum.core.encoding.TransactionEncoder;
 import org.hyperledger.besu.ethereum.mainnet.BodyValidation;
 import org.hyperledger.besu.ethereum.mainnet.ValidationResult;
-import org.hyperledger.besu.ethereum.rlp.BytesValueRLPOutput;
 import org.hyperledger.besu.evm.gascalculator.CancunGasCalculator;
 
 import java.math.BigInteger;
@@ -215,7 +214,13 @@ public void shouldValidateExcessBlobGasCorrectly() {
 
   @Test
   public void shouldRejectTransactionsWithFullBlob() {
-    List<String> transactions = List.of(createBlobTransactionEncodedForNetwork());
+
+    Bytes transactionWithBlobsBytes =
+        TransactionEncoder.encodeOpaqueBytes(
+            createTransactionWithBlobs(), EncodingContext.POOLED_TRANSACTION);
+
+    List<String> transactions = List.of(transactionWithBlobsBytes.toString());
+
     BlockHeader mockHeader =
         setupValidPayload(
             new BlockProcessingResult(Optional.of(new BlockProcessingOutputs(null, List.of()))),
@@ -229,24 +234,19 @@ public void shouldRejectTransactionsWithFullBlob() {
     verify(engineCallListener, times(1)).executionEngineCalled();
   }
 
-  private String createBlobTransactionEncodedForNetwork() {
+  private Transaction createTransactionWithBlobs() {
     BlobTestFixture blobTestFixture = new BlobTestFixture();
     BlobsWithCommitments bwc = blobTestFixture.createBlobsWithCommitments(1);
-    Transaction blobTx =
-        new TransactionTestFixture()
-            .to(Optional.of(Address.fromHexString("0xDEADBEEFDEADBEEFDEADBEEFDEADBEEFDEADBEEF")))
-            .type(TransactionType.BLOB)
-            .chainId(Optional.of(BigInteger.ONE))
-            .maxFeePerGas(Optional.of(Wei.of(15)))
-            .maxFeePerBlobGas(Optional.of(Wei.of(128)))
-            .maxPriorityFeePerGas(Optional.of(Wei.of(1)))
-            .blobsWithCommitments(Optional.of(bwc))
-            .versionedHashes(Optional.of(bwc.getVersionedHashes()))
-            .createTransaction(senderKeys);
-
-    final BytesValueRLPOutput bytesValueRLPOutput = new BytesValueRLPOutput();
-    TransactionEncoder.encodeOpaqueBytes(blobTx, EncodingContext.POOLED_TRANSACTION);
-    Bytes encodedRLP = bytesValueRLPOutput.encoded();
-    return encodedRLP.toString();
+
+    return new TransactionTestFixture()
+        .to(Optional.of(Address.fromHexString("0xDEADBEEFDEADBEEFDEADBEEFDEADBEEFDEADBEEF")))
+        .type(TransactionType.BLOB)
+        .chainId(Optional.of(BigInteger.ONE))
+        .maxFeePerGas(Optional.of(Wei.of(15)))
+        .maxFeePerBlobGas(Optional.of(Wei.of(128)))
+        .maxPriorityFeePerGas(Optional.of(Wei.of(1)))
+        .blobsWithCommitments(Optional.of(bwc))
+        .versionedHashes(Optional.of(bwc.getVersionedHashes()))
+        .createTransaction(senderKeys);
   }
 }
diff --git a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/core/encoding/BlobTransactionEncodingTest.java b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/core/encoding/BlobTransactionEncodingTest.java
index cc1829505ec..b1bb4be6764 100644
--- a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/core/encoding/BlobTransactionEncodingTest.java
+++ b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/core/encoding/BlobTransactionEncodingTest.java
@@ -57,10 +57,13 @@ public void blobTransactionEncodingDecodingForNetWorkTest(
     final Transaction transaction =
         TransactionDecoder.decodeOpaqueBytes(bytes, EncodingContext.POOLED_TRANSACTION);
 
+    final BytesValueRLPOutput output = new BytesValueRLPOutput();
+    TransactionEncoder.encodeRLP(transaction.getType(), bytes, output);
+
     final BytesValueRLPOutput bytesValueRLPOutput = new BytesValueRLPOutput();
     TransactionEncoder.encodeRLP(
         transaction, bytesValueRLPOutput, EncodingContext.POOLED_TRANSACTION);
-    assertThat(transaction.getSize()).isEqualTo(bytes.size());
+    assertThat(transaction.getSize()).isEqualTo(output.encodedSize());
   }
 
   @ParameterizedTest(name = "{index} {0}")
@@ -72,8 +75,7 @@ public void blobTransactionEncodingDecodingTest(final TypedTransactionBytesArgum
         TransactionDecoder.decodeOpaqueBytes(bytes, EncodingContext.BLOCK_BODY);
 
     // Encode the transaction for wire using the TransactionEncoder.
-    Bytes encoded =
-        TransactionEncoder.encodeOpaqueBytes(transaction, EncodingContext.POOLED_TRANSACTION);
+    Bytes encoded = TransactionEncoder.encodeOpaqueBytes(transaction, EncodingContext.BLOCK_BODY);
     // Assert that the encoded transaction matches the original bytes.
     assertThat(encoded.toHexString()).isEqualTo(bytes.toHexString());