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Do all 1991 small block 350's have 4 bolt mains?
No. Most of them were 2-bolt mains. The 3/4 and 1 ton 350 engines were 4-bolt main engines. All the 1/2 tons had the 2-bolt main block.
When did the 4 bolt main come out?
The earliest small block I've encountered with 4 bolt mains was a large journal 327 from about 67 or so.
Were the 350ci engines in the 1995 k1500 z71 4bolt mains or 2 bolt mains?
I've rebuilt many 1992 through 1995 350 engines in Z71 and siliverados and have yet to see a 4 bolt main. I've only seen them in the 3/4 tons and heaver.
Did 1970 350 truck engines come with 4 bolt mains?
My 1970 gmc 2500 came has one.
How do you tell either four bolt or to bolt main on gm engine 1024388 without removing the oil pan?
Generally, you can't. GM installed both 2 and 4 bolt main caps on many different cylinder block castings. Now, some blocks were never offered with 4 bolt mains. Any low performance displacement (262,267, 305, 307, etc) always had 2 bolt mains. Small journal engines (pre-1969 chevy small blocks) typically had 2 bolt mains even on performance engines.
Are 305 4 bolt mains?
no
What size Chevy engine has casting number 3932386?
it was made in 1969 from what i found.i have one that is 3932386 that left id pad says is a 327 out of full size car 210 hp.but that casting was also used for a 302 and 350 came in mostly 4 bolt mains but Chevy history says there was some 2 bolt 327's.
How many bolt mains on 1994 lt1 camaro motor?
The GM F Body LT1 cars got the 2 bolt mains. Only the Corvette LT1 got the 4 bolt mains with aluminum heads.
Do pontiac's350 have 4 bolt rear main?
I can't answer your question but I can say that my 260 hp 350 Mercruiser has 2 bolt mains and a 4 bolt rear main. Go figure! So I take it from your question that you also have 2 bolt mains with a 4 bolt rear main.
What year is the motor with the block number 10054727?
It was used in 1986 and up, some of them are 2- bolt mains and 4-bolt mains. They were NOTHING special. It does have a 1-piece rear main seal.
What block numbers should be on a Chevy 350 with four bolt mains?
There are no castings that were used exclusively for 4 bolt main applications.
In what year did Chevy stop using the 4 bolt main?
Almost all Chevies have been available with 4 bolt mains since the late 50's.
