HOME FORUM RULES CONTACT
     
   
   

Go Back   CLASS RACER FORUM > Class Racer Forums > Nostalgia Stock and Super Stock


Reply
 
Thread Tools Display Modes
Old 01-17-2019, 04:36 PM   #1
Lyn Smith
VIP Member
 
Join Date: Dec 2001
Location: Pontiac,il.
Posts: 1,118
Likes: 217
Liked 841 Times in 156 Posts
Cool Jr Stock piston rules

I was reading a 1968 NHRA rule book today.It said under the engine rules that you could use any replacement piston "as long as it doesn't increase the compression generally the same in appearance".So on the 1955 265 engine with the flat top piston could you use a piston that had valve reliefs like the 56 and 57 engines had?
Lyn Smith is offline   Reply With Quote
Old 01-17-2019, 07:25 PM   #2
Brian Fink
Member
 
Join Date: Jul 2007
Posts: 172
Likes: 35
Liked 28 Times in 9 Posts
Default Re: Jr Stock piston rules

Unfortunately you have to make the 55 style work ; I believe CP is the only option as they made the first set for Carl Libucha after he sent NHRA a stock one.
Brian Fink is offline   Reply With Quote
Old 01-17-2019, 08:06 PM   #3
Mark Yacavone
Veteran Member
 
Mark Yacavone's Avatar
 
Join Date: Mar 2002
Location: Miles From Nowhere
Posts: 7,371
Likes: 2,556
Liked 4,386 Times in 1,671 Posts
Default Re: Jr Stock piston rules

I would say yes. Probably wouldn't need them anyway, with the cams they had back then. Even if they did , they wouldn't work with the stock spring specs.
__________________
We are lucky we don't get as much Government as we pay for..... Will Rogers
Mark Yacavone is offline   Reply With Quote
Old 01-18-2019, 12:24 PM   #4
Dwight Southerland
VIP Member
 
Dwight Southerland's Avatar
 
Join Date: Dec 2001
Location: Arkansas - In the middle of everything.
Posts: 1,979
Likes: 52
Liked 704 Times in 176 Posts
Default Re: Jr Stock piston rules

Lyn -
I saw the Weir Bros. '55 Chev station wagon go through a tear down in 1968 and those pistons did have valve reliefs. They passed.
__________________
Dwight Southerland is offline   Reply With Quote
Old 01-18-2019, 02:54 PM   #5
Lyn Smith
VIP Member
 
Join Date: Dec 2001
Location: Pontiac,il.
Posts: 1,118
Likes: 217
Liked 841 Times in 156 Posts
Default Re: Jr Stock piston rules

According to some vintage GM Parts Books I have, the flat top replacement GM pistons were discontinued in mid 1957,and replaced by the 56 57 piston with the reliefs.
Lyn Smith is offline   Reply With Quote
Liked
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:47 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.