71 engine block in a lt1 vette?
Thread Starter
Instructor
Joined: Apr 2001
Posts: 101
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From: ny
71 engine block in a lt1 vette?
my friend is thinking about buying a 90's vette but he wants to know if his 1971 built 383 stroker bottom end will work in the lt1? I know it will work on the tpi but how about the lt1? besides the flywheel being different (difference between 1 piece and 2 piece rear main seal) what other problems are their?? any help and guidance would be great :)
Pro
Joined: Jan 2001
Posts: 681
Likes: 2
From: Newton (Wichita Area) Kansas
Re: 71 engine block in a lt1 vette? (1fst99z)
You'll need a stand-alone EFI computer. The LT1 PCM expects an Optispark signal; an HEI distrib won't work.
You'd also have to use the LT1 heads because of the reverse cooling thing. Also I'm not sure the coolant passages in the old block would be compatible - don't know.
You'd also have to use the LT1 heads because of the reverse cooling thing. Also I'm not sure the coolant passages in the old block would be compatible - don't know.
Thread Starter
Instructor
Joined: Apr 2001
Posts: 101
Likes: 0
From: ny
sorry guys I guess I wasnt very clear, my friend is only using the short block from the 71, he will use everything else from the lt1 engine including ignition, heads and intake. will there be any problems with this setup?
Le Mans Master
Joined: Jul 1999
Posts: 8,683
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From: Phoenix AZ
Re: (1fst99z)
sorry guys I guess I wasnt very clear, my friend is only using the short block from the 71, he will use everything else from the lt1 engine including ignition, heads and intake. will there be any problems with this setup?
Racer
Joined: Nov 2002
Posts: 427
Likes: 0
From: Stillwater OK, Fun City USA
Re: 71 engine block in a lt1 vette? (1fst99z)
He will need some serious work to make it go.
The LT1 block has reverse flow cooling and opti spark. The pump and opti will not change over to a non LT1 block.
Don't get me wrong it will physically fit, but he will need a different drive belt configuration to incorporate a standard water pump, and make provisions for a standard distributor. Or go distributorless!!
Good Luck!
Matt
The LT1 block has reverse flow cooling and opti spark. The pump and opti will not change over to a non LT1 block.
Don't get me wrong it will physically fit, but he will need a different drive belt configuration to incorporate a standard water pump, and make provisions for a standard distributor. Or go distributorless!!
Good Luck!
Matt
