Re: 1971 Buick 455 GS F/SA G/SA Build
 

Been there done that, it is good street car stuff.

Re: 1971 Buick 455 GS F/SA G/SA Build
 

A few years back I bought the car from a gentlemen in Wisconsin, he bought the car from Lyn Smith. I'am looking for virgin 661 and 149 casting heads, not easy to come by and 403 intakes.

Re: 1971 Buick 455 GS F/SA G/SA Build
 

OOPS. I actually didn't mean to insinuate he was cheating just a poorly stated question.

the correct question you answered though(thank you) basicly should've stated how much and what can you do with in the confines of a valve job to find gain, and the statement about the tools was just meant to mean he seams to have the tools at his disposal to play with valve jobs and test effects,and if i'm correct from his other post hp hunter also really seams to know what he's doing when it comes to building engines and making power, so i tend to watch his post there normally interesting.

the other part of this i find interesting is that i've read that low lift flow isn't always a good thing do to the possibility of reverse flow during the overlap period or stopping intake flow too soon. but in a stocker with a .390 ish lift limitation low lift is all you have so i guess you get all you can.

Re: 1971 Buick 455 GS F/SA G/SA Build
 

25* seat angle on intake with a narrow .070 seat because of so little lift.
20 top/25 seat/45 below and 70 in the throat. Make the 20 plenty big(not to the point of unshouding, lol) then deck to bring back cc's.
Instead of a 30* backcut on the valve(normal with a 45 seat), with a 25 seat, cut back 15-20* instead, basically anything to break the edge.
This works on sbf, not sure of the chamber clearance on a BBC or Pontiac/Buick etc.
HP Hunter, is this the type of answer you're looking for?

pfordamx, low lift is always good as the valve goes past it twice and more time is spent at that point then at the peak which most seem to focus on. I've never heard of (better or more) low lift not being a good thing, ever, but I'm willing to listen/learn from others...with validation and testing of course.

Re: 1971 Buick 455 GS F/SA G/SA Build
 

i have no independent testing to back that up i've just read the discussion quite a bit on speedtalk but more ways to prevent the port from flowing in reverse then limiting low lift flow but consequently i would think those two things would almost come hand in hand.

and HP hunter i really didn't intend any offense i enjoy your post.

Re: 1971 Buick 455 GS F/SA G/SA Build
 

I have a set of virgin 149 heads make me an offer

Re: 1971 Buick 455 GS F/SA G/SA Build
 

Please send me your phone number, thanks.

Re: 1971 Buick 455 GS F/SA G/SA Build
 

There was never any offense taken;)

Re: 1971 Buick 455 GS F/SA G/SA Build
 

This is something I can sink my teeth in.........I will give it a try on my test head..........thanks.




"pfordamx, low lift is always good as the valve goes past it twice and more time is spent at that point then at the peak which most seem to focus on. I've never heard of (better or more) low lift not being a good thing, ever, but I'm willing to listen/learn from others...with validation and testing of course"


But at the same time you have to consider where the piston is..................

Re: 1971 Buick 455 GS F/SA G/SA Build
 

Some very important tooling showed up today!