Home Menu

Menu


Pontiac - Street No question too basic here!

          
PY Online Forums - Bringing the Pontiac Hobby Together > General Classic PONTIAC TECH > Pontiac - Street > Engine trouble diagnosis
Reply
Page 2 of 2 1 2
 
Thread Tools Display Modes
  #21  
Old 06-08-2018, 10:50 AM
Sprocket's Avatar
Sprocket Sprocket is offline
Senior Member
  
Join Date: Nov 2006
Location: Fort Worth TX
Posts: 230
Default
Quote:
Originally Posted by chiphead View Post
A 216 single pattern cam in a high compression 455? Yeah, those pistons have been banged harder than (insert metaphor here). Leakdown test for sure. Hopefully it's not already 60 over. What cam did you have decent results with?


I'm from south Louisiana. It's not the heat, it's the stupidity. Present company excepted, of course. Never been to Eunice, but I've been to Fred's lounge in Mamou
The cam we put in is an Ultradyne 223/231. The car is a 4-spd, and we could have gone one step larger, but it's what we had on hand and makes for an excellent pure 455 daily driver.

__________________
'70 GP Model J
462 Butler ported 87cc Edelbrock D-ports
RPM intake with Holley Sniper 2
CompCams 236/242 hydraulic roller
Tribal Tubes tri-y headers
TH400 13" Continental "Jim Hand Special"
3.50 9" CurrieTrac, 245/45-18 Front, 275/40-18 Rear
Reply With QuoteReply With Quote
  #22  
Old 06-08-2018, 10:58 AM
steve25's Avatar
steve25 steve25 is offline
Ultimate Warrior
  
Join Date: May 2008
Location: Westchester NY
Posts: 14,832
Default
That Ultradyne Cams .485" Exh lift is far too much for the stock installed height on 4X heads , this ihas likely something to do with the issue your dealing with!

__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!

1) 1940s 100% silver 4 cup tea server set.

Two dry rotted 14 x 10 Micky Thompson slicks.

1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.

Education is what your left with once you forget things!
Reply With QuoteReply With Quote
  #23  
Old 06-08-2018, 12:44 PM
Sprocket's Avatar
Sprocket Sprocket is offline
Senior Member
  
Join Date: Nov 2006
Location: Fort Worth TX
Posts: 230
Default
Quote:
Originally Posted by steve25 View Post
That Ultradyne Cams .485" Exh lift is far too much for the stock installed height on 4X heads , this ihas likely something to do with the issue your dealing with!
The heads have aftermarket valve springs and Ferrea valves set up to handle .500" lift.

__________________
'70 GP Model J
462 Butler ported 87cc Edelbrock D-ports
RPM intake with Holley Sniper 2
CompCams 236/242 hydraulic roller
Tribal Tubes tri-y headers
TH400 13" Continental "Jim Hand Special"
3.50 9" CurrieTrac, 245/45-18 Front, 275/40-18 Rear
Last edited by Sprocket; 06-08-2018 at 12:49 PM.
Reply With QuoteReply With Quote
Reply
Page 2 of 2 1 2

« Previous Thread | Next Thread »

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 11:31 AM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Contact Us Home
Copyright © 2017