87 TPI 350 replacing 85 305 TPI
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From: Marshalltown, IA
Car: 1985 IROC / 1986 SC
Engine: 305 TPI / 2.8 MFI
Transmission: 700R4's
Axle/Gears: 3.27 Posi / 3.42 Open
87 TPI 350 replacing 85 305 TPI
I am going to be replacing my LB9 305 tpi engine in my 85 IROC with a stock 350 tpi from an 87 IROC. My question involves the distributor. I believe I need to replace the distributor gear with a melonized one as I am going to be reusing the distributor from the 85. I s this correct? I am assuming the factory roller camshaft is steel in 87? Any input is appreciated.
Joined: Mar 2000
Posts: 43,187
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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
That's the word from GM.
I've heard that they started using the melonized gear before they started using roller lifters, but I can't back that up. I believe the gears will swap between the distributors if you're getting the '87 piece. But, I can't say that for certain.
I've heard that they started using the melonized gear before they started using roller lifters, but I can't back that up. I believe the gears will swap between the distributors if you're getting the '87 piece. But, I can't say that for certain.
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NBrehm
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Aug 25, 2015 11:49 PM
