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L98 pistons? Flat or Dish?

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Old

Jul 2, 2004 | 05:25 PM

#1

Thread Starter

Supreme Member

Joined: Jan 2004

Posts: 2,322

Likes: 100

From: So. Ohio

Car: 88 Camaro

Engine: L98 350

Transmission: 700r4

L98 pistons? Flat or Dish?

Figuring compression ratios, 64CC iron heads vs 56 cc fastburns. Are the L98 pistons flat top from factory?

Old

Jul 2, 2004 | 06:11 PM

#2

Senior Member

Joined: Jun 2002

Posts: 558

Likes: 0

From: Bowling Green KY

Car: 87 IROC-Z

Engine: 350ci

Transmission: T-5

12cc dish IIRC

Old

Jul 4, 2004 | 08:15 PM

#3

Thread Starter

Supreme Member

Joined: Jan 2004

Posts: 2,322

Likes: 100

From: So. Ohio

Car: 88 Camaro

Engine: L98 350

Transmission: 700r4

Thanks for info. Beautiful area there at B.G.

Old

Jul 5, 2004 | 08:21 AM

#4

Supreme Member

Joined: May 2000

Posts: 2,963

Likes: 3

Car: 1982 Z28

Engine: LS1

Transmission: T56

It may depend on the year of the L98. Traxxion's stock L98 had 4 valve relief flat-tops...could be GM changed over at some point in the 90+ years.

My '88 L98 had dish-tops.

Old

Jul 5, 2004 | 08:34 AM

#5

Senior Member

Joined: Jan 2003

Posts: 892

Likes: 1

From: Ottawa

Car: 91Z

Engine: 355/afr/sr/lpe219

Transmission: built 700R

Yes, they changed the pistons for the last 3 years (90-92).

Old

Jul 6, 2004 | 11:02 AM

#6

Supreme Member

Joined: Jul 1999

Posts: 2,149

Likes: 4

From: Mims, Florida

Car: '87 IROCZ

Engine: 395 ZZ4

Transmission: ProBuilt 700R4

Axle/Gears: 9 bolt 3.70s

My stock L98 pistons have only valve reliefs, maybe accounting for 7cc. They are not dished,, its an '87.

Old

Jul 6, 2004 | 06:59 PM

#7

Senior Member

Joined: Jun 2002

Posts: 558

Likes: 0

From: Bowling Green KY

Car: 87 IROC-Z

Engine: 350ci

Transmission: T-5

Mine is a 91 or 92 block and they are dished with valve reliefs on the intake side IIRC.

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