What CC are 85 305 TPI Heads????
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Junior Member
Joined: Nov 2000
Posts: 23
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From: Chicago
What CC are 85 305 TPI Heads????
I am swapping a 350 shortblock under my 85 305 TPI heads and intake. My question is what CC are the stock 85 Heads? I don't want to kill my compression. Any other problems I may have with an older block with 85 heads and TPI system?
Thanks in advance
Thanks in advance
Joined: Apr 2000
Posts: 1,536
Likes: 322
From: South Windsor, CT
Car: '89 GTA
Engine: ZZ6TPI
Transmission: T56
Axle/Gears: Borg Warner 3.70:1
The heads should be 58cc. you should have no problem with the older 350 block since the newer block started in 86, so it should be the same. The only thing you may have trouble with is the knock sensor. the older 350 may not have provisions for that, but you could probably srill and tap a hole.
89 Transam GTA, a few bolt ons
89 Transam GTA, a few bolt ons
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
All thirdgen 305 heads are 58cc, and all thirdgen 350 heads are 64cc.
------------------
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
------------------
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
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