Build engine

Reply Subscribe

Thread Tools

07-14-2022 | 01:27 PM

#121

Zole

Thread Starter

Registered

Joined: May 2022

Posts: 258

Likes: 90

From: Croatia

Quote:

Originally Posted by F-2 Speedy

Pretty sure that SB said the long reach plug was correct for the 088 head

yea 14 mm he sead...i did not messure.The engine works fine on 7 cil just #6 makes problem..Same spark plugs all oraund.

07-14-2022 | 01:27 PM

#122

resurrected

Platinum Member

Joined: Jan 2005

Posts: 1,157

Likes: 520

From: Owen Sound Ont.

I run short AC's in my 088 heads.

07-14-2022 | 01:32 PM

#123

Zole

Thread Starter

Registered

Joined: May 2022

Posts: 258

Likes: 90

From: Croatia

Quote:

Originally Posted by resurrected

I run short AC's in my 088 heads.

What would that be in NGK world..thank you

07-14-2022 | 01:46 PM

#124

cheech

Registered

Joined: Aug 2010

Posts: 1,386

Likes: 565

Quote:

Originally Posted by F-2 Speedy

Pretty sure that SB said the long reach plug was correct for the 088 head

No he said the ones Zole pictured looked too long. As quoted below.
The MR43T specs are what's called for the 088 heads.

Quote:

Originally Posted by SB

That spark plug appears to have longer reach than what oe cast iron heads use. (.460”) What heads do you have ?

this is what they should look like with factory cast iron heads:

07-14-2022 | 01:49 PM

#125

F-2 Speedy

Platinum Member

Joined: May 2012

Posts: 11,449

Likes: 3,981

From: Midwest & T-Rock

Quote:

Originally Posted by SB

Okay. Oem GenV cast iron rectangular port heads. Should be using a typical .460” reach 14mm thread tapered seat plug.

Being supercharged, i’d run an acdelco mr42t or equivalent.

Possible that those extra long spark plugs you used caused preignition. You could have other tuning issues too, but this is a serious problem.

I miss quoted SB, you should be running the short ones, cheech we were posting at the same time

07-14-2022 | 01:49 PM

#126

cheech

Registered

Joined: Aug 2010

Posts: 1,386

Likes: 565

Quote:

Originally Posted by Zole

What would that be in NGK world..thank you

Standard and Iridium numbers below.
The actual plug number for each is in the comments.
NOTE: The numbers listed are the OEM heat range.

07-14-2022 | 02:08 PM

#127

Zole

Thread Starter

Registered

Joined: May 2022

Posts: 258

Likes: 90

From: Croatia

Quote:

Originally Posted by cheech

Standard and Iridium numbers below.
The actual plug number for each is in the comments.
NOTE: The numbers listed are the OEM heat range.

So this looks a lot shorter...Ok i'll buy this one see the change...Do you all think that the piston could have hit the spark plug...on only one cilindar?