Attn 305 TPI owners
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Junior Member
Joined: May 2009
Posts: 12
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Car: 1990 Trans am GTA
Engine: 305 TPI
Transmission: 700r4
Attn 305 TPI owners
Do the valve covers on your 305 TPI bolt up in the center of the valve cover or on the sides? I have a 90 Trans am GTA with a 305 and they bolt up in the center, but a GM parts center told me only the 350 valve covers both up in the center (according to her computer).
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Joined: Aug 2008
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From: the big ol nc
Car: 88 t/a tpi ported polished bolt ons
Engine: lb9 got 406 on paymnt wow FI 406
Transmission: 700r4
Axle/Gears: 99 z28 342 in back
Re: Attn 305 TPI owners
Do the valve covers on your 305 TPI bolt up in the center of the valve cover or on the sides? I have a 90 Trans am GTA with a 305 and they bolt up in the center, but a GM parts center told me only the 350 valve covers both up in the center (according to her computer).
Supreme Member
Joined: Jan 2000
Posts: 3,178
Likes: 48
From: Tracy, CA
Car: '87 IROC
Engine: LB9
Transmission: TH700R4
Re: Attn 305 TPI owners
My '87 LB9 (305) has center bolt covers. She needs to get a new computer.....
Center bolt covers showed up on both 305's and 350's around 1987 MY.
Center bolt covers showed up on both 305's and 350's around 1987 MY.
Junior Member
Joined: Aug 2009
Posts: 63
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From: Montana
Car: 1985 Iroc Camaro, 1974 type LT Z28
Engine: modified L98 corvette, L82
Transmission: 700r4, Turbo 400
Axle/Gears: 3.42, 3.42 posi
Re: Attn 305 TPI owners
I believe my 85 Iroc had center bolt valve covers from the factory.
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Joined: Mar 2000
Posts: 43,187
Likes: 46
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
1955-1986 SBC = perimeter bolts, regardless of engine displacement ('55-'58 bolts were off-set top to bottom, '59-'86 bolts were straight across top to bottom).
1987-2000 SBC = center bolts, regardless of engine displacement.
1987-2000 SBC = center bolts, regardless of engine displacement.
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