Hop up for L82 engine

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May 23, 2003 | 10:46 PM

#21

blackLS1

Racer

Joined: Jan 2002

Posts: 440

Likes: 2

From: Smithfield NC

Re: Hop up for L82 engine (Engo)

I was thinking of hopping up a L82.I wanted to run a nice beefy hydraulic roller cam and a different pistons to raise compression to around 10:1 or 10.5:1.What do you guys think?Am I moving along the correct lines?

May 24, 2003 | 02:49 AM

#22

Chuck Harmon

Melting Slicks

Joined: Apr 2000

Posts: 3,286

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From: San Jose California

Re: Hop up for L82 engine (blackLS1)

Quote:

As I recall, the L82 comes with very nice forged pistons, crank, and good rods. As I said earlier, the easiest way to raise the compression to the numbers you stated is by putting 2.02" 64 cc heads on. A hydraulic roller with some decent numbers would complete the package making an L82 into something that would humble a very potent 370hp LT1.

Chuck

May 24, 2003 | 06:48 PM

#23

blackLS1

Racer

Joined: Jan 2002

Posts: 440

Likes: 2

From: Smithfield NC

Re: Hop up for L82 engine (Chuck Harmon)

The L82 is from a 79 vette.I thought it came with the 2.02 64CC heads. :confused: Or was that a different year.

May 24, 2003 | 07:52 PM

#24

Chuck Harmon

Melting Slicks

Joined: Apr 2000

Posts: 3,286

Likes: 8

From: San Jose California

Re: Hop up for L82 engine (blackLS1)

I believe that the HP small block heads used from 1971 to 1979 were 2.02's but 76cc chambers not 64cc. I would bet a double cheese burger on this, but not a full steak dinner.

Chuck

May 24, 2003 | 11:49 PM

#25

A C

Le Mans Master

Joined: May 2000

Posts: 6,493

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From: Bloomington MN

Cruise-In II Veteran

Re: Hop up for L82 engine (Chuck Harmon)

I am pretty sure Chuck is right. I think the cc of the heads made up the compression ratio difference. Also, you never did say what exhaust you had. There is a BIG difference between an early true dual exhaust car and a later single exhaust car.

May 25, 2003 | 02:24 PM

#26

blackLS1

Racer

Joined: Jan 2002

Posts: 440

Likes: 2

From: Smithfield NC

Re: Hop up for L82 engine (Chuck Harmon)

Thanks Chuck.Can I mill these heads down or should I just look for some different heads.I plan to put this motor in a 91 S10.Longtube headers and dual exhaust.

May 25, 2003 | 02:43 PM

#27

Tom73

Race Director

Joined: Apr 1999

Posts: 15,136

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From: NM

Re: Hop up for L82 engine (Chuck Harmon)

Quote:

I believe that the HP small block heads used from 1971 to 1979 were 2.02's but 76cc chambers not 64cc.

The L82 came with 2.02/1.60 heads that had 76cc chambers. Like said before it was basicly a lower compression verison of the L46 (35/350) engine. It is a great engine. The 73/74 L82 was 250 hp which was never exceded by later classic chevy small blocks. Took the GenII LT1 to pass them in power.

A good tune, distrib recurve and carb tune, will do wonders for the L82. 73/74 L82 came with true duals at 2 1/2" so the addition of headers along with the tune would be good.

tom...

May 28, 2003 | 03:42 PM

#28

DaveL82

Drifting

Joined: Jul 1999

Posts: 1,542

Likes: 43

From: Plano TX

Re: Hop up for L82 engine (Tom73)

By the time you pay to retrofit a roller cam in an older block, it's cheaper to get a ZZ4 motor.

You need 64cc heads, the L82 (comes with 72 or 76cc but can't remeber which).

That's the reason my L82 sits in the corner collecting dust.