stock 86 305 TPI cam specs
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Joined: Jan 2002
Posts: 253
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From: NH
Car: 1989 Formula 350
Engine: Stealth Rammed 350
Transmission: 700R4
Axle/Gears: 3.45 9 bolt
stock 86 305 TPI cam specs
anyone know where i can find out this info. i did a search and all i found was people asking what they should use for replacements. i wanna know the stock number so ill know how much of a jump in lift and duration im gonna be gettin.
Last edited by F-Bobby; May 22, 2006 at 11:21 PM.
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1986 305 TPI 190 hp / 285 lb/ft Tach: yellow 4500 red 5000
Code:
ACTUAL
Valve Lift: intake .350 .360
exhaust .385 .388
Lobe Lift: intake .233 .236
exhaust .256 .258
Duration: intake 320º 226º
(crank) exhaust 320º 245º
Duration at
.075 valve lift 179º / 194° 180º / 195º
Overlap at
.075 valve lift 4º
Accel rate above
.075 valve lift .00491"/deg.
Lift at TDC .085" 
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
The 86 TPI cam is the flat-tappet version of the TBI peanut cam. It was the same cam used in LG4 engines. I dont know how you can mention this cam and a jump in lift and duration in the same sentence. This cam is horribly small.
Thread Starter
Member
Joined: Jan 2002
Posts: 253
Likes: 2
From: NH
Car: 1989 Formula 350
Engine: Stealth Rammed 350
Transmission: 700R4
Axle/Gears: 3.45 9 bolt
Originally Posted by Kevin91Z
The 86 TPI cam is the flat-tappet version of the TBI peanut cam. It was the same cam used in LG4 engines. I dont know how you can mention this cam and a jump in lift and duration in the same sentence. This cam is horribly small.
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
As long as your old 355 cam is a flat tappet, and you keep the lifters on the same cam lobe as they were installed in your engine, you can do that.
Mismatching lifters is a quick way to wipe out a cam lobe.
Mismatching lifters is a quick way to wipe out a cam lobe.
Joined: Jan 2005
Posts: 10,406
Likes: 492
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Originally Posted by Kevin91Z
The 86 TPI cam is the flat-tappet version of the TBI peanut cam. It was the same cam used in LG4 engines. I dont know how you can mention this cam and a jump in lift and duration in the same sentence. This cam is horribly small.
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