85 engine specs please

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Mar 18, 2009 | 09:55 PM

motodog

Thread Starter

Racer

Joined: Feb 2009

Posts: 261

Likes: 1

From: Riverside CA

85 engine specs please

does anyone know what the cam specs, comp ratio, piston material, valve size, chamber size, ect, a 85 l98 with.

Mar 18, 2009 | 10:25 PM

M.J.L.

Safety Car

Joined: Jul 2008

Posts: 3,966

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From: Made In America

St. Jude Donor '10-'11

Quote:

Originally Posted by motodog

does anyone know what the cam specs, comp ratio, piston material, valve size, chamber size, ect, a 85 l98 with.

I am pretty sure your cam specs are 202/206 0.50, forged pistons because they changed that in 86. 84 and 85 both had forged pistons but I don't know why they changed it in the later years. Hopefully someone with more knowledge will chime in. If I made a mistake, please let me know someone.

Edit: Does anyone have any information as to why GM changed from forged pistons after 85?

Last edited by M.J.L.; Mar 19, 2009 at 08:44 AM.

Mar 18, 2009 | 10:53 PM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

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From: Australia

202/206 @ .050", 403/415 lsa 114.5.
1.94 / 1.50 Valves
Cast heads prob same as F-body L98 iron heads at 64cc

Mar 19, 2009 | 03:28 AM

khhammer

Advanced

Joined: Jun 2007

Posts: 71

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From: Tucson Az

The 85 L98 iron heads were 76cc

Mar 19, 2009 | 09:31 AM

Demonic85

Team Owner

Joined: Feb 2006

Posts: 24,460

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From: sw Ohio

230 HP / 330 ft. lbs torque

Cast iron engine block with 2 bolt main caps
4.00 x 3.48 (bore x stroke), 350 ci.
forged TRW pistons
cast crank and rods
9.0:1 compression ratio
6 degrees BTDC @ 650 rpm

Cam
Duration @ 0.050 202/206
Lift with 1.5 R 403/415
Lobe Seperation 114.5

Cast Iron cylinder heads
1.94 intake/1.50 exhaust
76cc combustion chamber
160-165cc intake runners

Bosch TPI
24 lb/hr Rochester fuel injectors
30 psi fuel pressure regulator
50 psi / 24 gph in tank fuel pump
ECM 1226870