Question about the difference between tpi and tbi 5.7L blocks
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Joined: Sep 2004
Posts: 192
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From: Albuquerque / Las Cruces, New Mexico
Car: 91 camaro z28
Engine: 6.3L, heads, headers, cam,.....
Transmission: 700-R4 w/shift kit and 3-4 WOT kit
Axle/Gears: 4.11
Question about the difference between tpi and tbi 5.7L blocks
were the tbi and tpi 5.7L blocks different from 87 - 92? Did one of them come with a four bolt mains? And did one block come stock with a hydralic roller cam? Thanks guys for your help
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Joined: Aug 2005
Posts: 3,004
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From: Yellowknife, NWT, Canada
Car: 84 Z28
Engine: 357
Transmission: TH-350C
Axle/Gears: 3.43
Theirs a few variances in the engines.
2/4 bolt mains
heads were redesigned, intake bolts now at a different angle
1 piece RMS
Roller cam setups becoming a standard
Probably another half million other things that changed in the late 80s too...
2/4 bolt mains
heads were redesigned, intake bolts now at a different angle
1 piece RMS
Roller cam setups becoming a standard
Probably another half million other things that changed in the late 80s too...
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Joined: Jul 2004
Posts: 10,763
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From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
just comparing 87-92 blocks (disregarding anything older):
are you talking tpi Fbody blocks, and tbi 350 truck blocks? (no 350 TBI's in f bodies right? )
same block I think, 2 bolt mains all around. Truck 4 bolt blocks was back in the day I think.
tpi's got a roller cam, tbi's got a flat tappet, but had all provisions for a roller cam.
are you talking tpi Fbody blocks, and tbi 350 truck blocks? (no 350 TBI's in f bodies right? )
same block I think, 2 bolt mains all around. Truck 4 bolt blocks was back in the day I think.
tpi's got a roller cam, tbi's got a flat tappet, but had all provisions for a roller cam.
Supreme Member
Joined: Aug 2005
Posts: 3,004
Likes: 4
From: Yellowknife, NWT, Canada
Car: 84 Z28
Engine: 357
Transmission: TH-350C
Axle/Gears: 3.43
4 bolts arent a thing of the past, i do doubt they used them in our gutless wonders though.
My 4 bolt 350 block is an 84, not out of a third gen obviously tho...
My 4 bolt 350 block is an 84, not out of a third gen obviously tho...
Joined: Jan 2005
Posts: 10,430
Likes: 500
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
My old 4 bolt one piece seal, roller cam 355 was from a 1992 G20 van.
The 4 bolt main 350 continues all the way up to today. Mercruiser still builds them as boat engines!
The 4 bolt main 350 continues all the way up to today. Mercruiser still builds them as boat engines!
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