LT-1 engine questions and how did he get in?
Started tearing into the engine yesterday. Do all oversize pistons have the oversize number stamped on them. I was under the impresion the engine was rebuilt at least once. I can tell it has been apart by gaskets. What can you tell me?
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Re: LT-1 engine questions and how did he get in?
The blue material on the head surface certainly indicates a non-original head gasket. The original head gaskets used on LT-1 never used that material.
I believe someone once said if there was a nuclear holocaust only the roaches would survive.Terry -
Re: LT-1 engine questions and how did he get in?
Haven't you ever heard someone say they thought they had a bug in their engine? Now you know what they meant, Ha! Hey, he's a beauty.
Stu FoxComment
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Re: LT-1 engine questions and how did he get in?
Keith-----
The pistons installed in the engine are GM pistons. Not all GM oversize pistons are stamped with an oversize. However, I strongly suspect these are the original pistons rather than a GM replacement. Engines are sometimes rebuilt without being bored oversize and without piston replacement. It's real easy to tell, though: just measure the bore size.
The number on the piston crown is a forging number. Forged pistons of standard and over-size are usually machined from the same forged blank, so the number does not tell us whether the piston is of standard bore size or some over-size.
As Terry mentioned, the engine has definitely had, at least, the heads removed at some point. The blue residue is indicative of the installation of Fel-Pro "Permatorque" head gaskets. These were definitely NOT used in PRODUCTION---they hadn't even been invented yet at that time and even after they were invented GM never used them for any PRODUCTION engine (probably way too expensive).In Appreciation of John HinckleyComment
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Re: LT-1 engine questions and how did he get in?
Thats a cricket !
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Re: LT-1 engine questions and how did he get in?
Is that cricket a 70 or is it an early 71?Comment
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Re: LT-1 engine questions and how did he get in?
Is that a #s matching cricket or a restamp,,,,Comment
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Re: LT-1 engine questions and how did he get in?
It's a repo cricket. His eyes are to close together.
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Re: LT-1 engine questions and how did he get in?
Looks like the nuts on the connecting rod bolts have been off on the far right side. DaleComment
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Re: LT-1 engine questions and how did he get in?
The nuts on the bolts. D/Comment
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Re: LT-1 engine questions and how did he get in?
The red on the valves is rust.
This car had been parked since 1986.
How can you tell the rod bolts have been off.
I will measure with micrometer tonight. I didn't have one at home Saturday. I really expected to see a 30 over or something on the piston. But I understand these pistons being machined to size from a larger casting.Comment
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Re: LT-1 engine questions and how did he get in?
Keith-----
Aftermarket forged pistons of various sizes are usually machined from the same forging blank, too. However, they usually have an oversize stamped on the piston top. Sometimes GM pistons do and sometimes they don't. Standard size are usually never stamped.
Let us know what you find out on the bore size.In Appreciation of John HinckleyComment
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Re: LT-1 engine questions and how did he get in?
As Dale replied, A close inspection of rod cap nuts and main bearing cap bolts will reveal signs of previous removal and reinstallation. SteveComment
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Re: LT-1 engine questions and how did he get in?
I thought I saw an ad on EBay for NOS cricket parts, but It was probably a spoof............crickets didn't come with side pipes.Comment
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