Go Back   The Supercar Registry > General Discussion > Pontiac


Reply
 
Thread Tools Display Modes
  #1  
Old 06-20-2018, 12:42 PM
Tracker1's Avatar
Tracker1 Tracker1 is offline
Yenko Contributing Member
 
Join Date: May 2006
Location: ONTARIO
Posts: 3,366
Thanks: 923
Thanked 980 Times in 469 Posts
Default

I vote stroker kit - keeps all the mods inside and 400hp easily done, otherwise follow Baron's recos. Especially on the cliff ruggles carb - no need for aluminum heads here Chuck, but maybe a street port and clean-up of the originals. The 78-79 481988XX W72 block is one of THE best Pontiac blocks for high-horse mods so no worries there.

That'll be a nice car - good luck.

P.S. The weak block Baron is referring to is the 500557 block used mid-1975 to 1977. Not a great block to build 400+ horses with. Avoid.
__________________
I ain't nobody, dork.

Last edited by Tracker1; 06-20-2018 at 12:48 PM.
Reply With Quote
The Following User Says Thank You to Tracker1 For This Useful Post:
Baron Von Zeppelin (06-20-2018)
  #2  
Old 06-21-2018, 04:46 AM
9999 9999 is offline
Member
 
Join Date: Mar 2013
Location: Central California
Posts: 61
Thanks: 38
Thanked 9 Times in 7 Posts
Default

Quote:
Originally Posted by Tracker1 View Post
P.S. The weak block Baron is referring to is the 500557 block used mid-1975 to 1977. Not a great block to build 400+ horses with. Avoid.
I have a 557 block that I was considering using and have done some extensive research. The conclusion was roughly this:
Do not take it past 6000rpm. Keep it below 450 hp if going to ~5500rpm. If sticking at a max of 4500-5000(low-grunt street engine; torque monster), there is a reasonable chance you could get 500+hp and it would live safely.
RPM is going to be the thing that causes the weaker 557 castings to slightly contort and that would then encourage the crankshaft to fail.
I would say for anything around 400hp, a 557 block would make a fantastic replacement motor so you can preserve the original block. Thankfully they are relatively common.


Have fun with the build!
__________________
--Nick
Reply With Quote
Reply


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. The time now is 04:24 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.

O Garage vBulletin Plugins by Drive Thru Online, Inc.