LS1TECH - Camaro and Firebird Forum Discussion
LS1-LS2-LS3-LS6-LS7 PERFORMANCE
Generation III Internal Engine
new build piston hitting heads .help

Generation III Internal Engine 1997-2006 LS1 | LS6

Sponsored by:

new build piston hitting heads .help

Reply Subscribe

Search this Thread

Old

May 17, 2013 | 11:17 PM

#1

Thread Starter

TECH Fanatic

iTrader: (18)

Joined: May 2008

Posts: 1,608

Likes: 1

From: Dallas, Tejas

Default

new build piston hitting heads .help

i sold my lq4 to a guy and just got word that when he bolts the heads down, the piston is contacting the head.

head are unworked 799s

has anyone seen anything like this?

Old

May 17, 2013 | 11:45 PM

#2

TECH Addict

iTrader: (6)

Joined: Sep 2005

Posts: 2,391

Likes: 3

Default

Yeah, its called "piston to valve" contact. Typical when you run a long duration/high lift cam with pistons that don't have valve reliefs. Nothing you can you can do. He needs to fly-cut the pistons or run a smaller cam.

Old

May 18, 2013 | 12:15 AM

#3

Thread Starter

TECH Fanatic

iTrader: (18)

Joined: May 2008

Posts: 1,608

Likes: 1

From: Dallas, Tejas

Default

sorry, I forgot to mention that he hadnt installed pushrods or rockers. It is not P2V

Im scratching my head on what it could be.

btw, thanks for the post. since I didnt post "500rwhp dyno results" I was afraid I wouldnt get any replies lol

Old

May 18, 2013 | 12:27 AM

#4

8 Second Club

iTrader: (3)

Joined: Aug 2011

Posts: 4,729

Likes: 814

From: Portland, OR

Default

Maybe he forgot head gaskets.......
Pistons usually out .007".......so with no gaskets, they will hit the head,
Is he mocking things up or what is he doing?

Old

May 18, 2013 | 01:30 AM

#5

8 Second Club

iTrader: (2)

Joined: May 2010

Posts: 735

Likes: 1

Default

^^
Thats what id put money on

Old

May 18, 2013 | 02:13 AM

#6

8 Second Club

iTrader: (3)

Joined: Aug 2011

Posts: 4,729

Likes: 814

From: Portland, OR

Default

Or maybe is using 5.7 head gaskets?

Old

May 18, 2013 | 02:32 AM

#7

8 Second Club

iTrader: (2)

Joined: May 2010

Posts: 735

Likes: 1

Default

Its still .056 or so thick
Shouldnt be anywhere close

Trending Topics

60-130 Dragy runs?

20

444
LS3 will not run

21

481
Car covers

11

665
New to me '04

18

369
Accessories for LS swapped 67 Firebird

5

182

Old

May 18, 2013 | 06:25 AM

#8

Thread Starter

TECH Fanatic

iTrader: (18)

Joined: May 2008

Posts: 1,608

Likes: 1

From: Dallas, Tejas

Default

thanks for the replies guys. he did say he is using stock headgaskets.

i forgot to ask if he ordered ls1 or lq4 headgaskets lol cos if he ordered ls1 headgaskets then that would be the problem.

thanks all. i will find out today.

is there any other possible situation that could cause this? i mean, i had 862 and 317 heads on the thing and never had a problem.

LS1 Tech Stories

The Best V8 Stories One Small Block at Time

6 Common C5 Corvette Failures and What's Involved In Repairing Them

Pouria Savadkouei

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Verdad Gallardo

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Pouria Savadkouei

Top 10 Most Powerful Chevy Trucks Ever Made!

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Verdad Gallardo

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Verdad Gallardo

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Verdad Gallardo

10 Camaros You Should Never Buy

10 LS Engine Myths That Refuse to Die

Verdad Gallardo

Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

Brett Foote

Old

May 18, 2013 | 10:57 AM

#9

8 Second Club

iTrader: (3)

Joined: Aug 2011

Posts: 4,729

Likes: 814

From: Portland, OR

Default

If he used 5.7 gaskets and they are smaller than the bore, the piston will hit the gasket. But I've never messed with a 6.0.

Old

May 18, 2013 | 11:12 AM

#10

TECH Fanatic

iTrader: (45)

Joined: Jan 2007

Posts: 1,844

Likes: 1

From: Tennessee

Default

Quote:

Originally Posted by RonSSNova

If he used 5.7 gaskets and they are smaller than the bore, the piston will hit the gasket. But I've never messed with a 6.0.

I had a friend do this. It would be my guess that the piston is hitting the gasket.. Who knows though.

Old

May 18, 2013 | 03:30 PM

#11

Thread Starter

TECH Fanatic

iTrader: (18)

Joined: May 2008

Posts: 1,608

Likes: 1

From: Dallas, Tejas

Default

hi, he just double checked the gaskets and they are the wrong ones. he got sent ls1 gaskets instead of lq4.

thanks all for the help

Old

May 19, 2013 | 08:26 AM

#12

TECH Fanatic

iTrader: (45)

Joined: Jan 2007

Posts: 1,844

Likes: 1

From: Tennessee

Default

Quote:

Originally Posted by 71 chevy

hi, he just double checked the gaskets and they are the wrong ones. he got sent ls1 gaskets instead of lq4.

thanks all for the help

Great to hear, puts you in the clear.

Old

May 19, 2013 | 10:20 AM

#13

On The Tree

iTrader: (30)

Joined: May 2013

Posts: 119

Likes: 1

From: Houston, Tx

Default

lol iam glad its an easy fix

Reply Subscribe

heads, hitting, piston

First
Prev
1 / 1
Next
Last

All times are GMT -5. The time now is 04:40 PM.