This is topic 351 intake??? in forum Tech Talk at Northern California Ford Owners  .


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Posted by primeredbeast89dropgt (Member # 10102) on :
 
As title says I was wonder if I would be able to use a holly systemax upper on a gt40 lower, if I port it a little? Do the bolts line up properly? Would I get any gains or would it make things worse?

Thanks ca Ford's appreciate any advice
 
Posted by Duncan Motors (Member # 7045) on :
 
no completely different design. now if u have a holley upper, i think its similiar to a stock runner design used in some pick ups late 80s early 90s design. u might be able to port match or get it close.
 
Posted by primeredbeast89dropgt (Member # 10102) on :
 
Thanks Duncan. Any specific pick up or it shouldn't matter just in between those years?
 
Posted by Duncan Motors (Member # 7045) on :
 
man lol im noe sure. its just the intake runner gotta have the same runner design, go explore or ask that specific question on here u might get a better answer, sorry
 
Posted by LXjames (Member # 10791) on :
 
Some trucks had the gt40 lower so you can throw a cobra/gt40/tubular upper on top and some had a 351w Holley lower. That's the rare one. Believe it was stock just rare as hell. An Duncan know his shit I saw his work
 
Posted by primeredbeast89dropgt (Member # 10102) on :
 
Haha its all good Duncan I appreciate the info and thanks James for the help as well. Sounds like a headache so ima keep it simple and just put a cobra or gt40 upper thanks again guys [patriot]
 
Posted by AR_Stang (Member # 10223) on :
 
I was going to go with the truck lower with the Holley upper, but after asking on corral and theturboforums everyone told me the truck lower was to restrictive. I ended up going with a gt40 lower (ported) and a cartech box upper.
 
Posted by primeredbeast89dropgt (Member # 10102) on :
 
A R stang is that upper better flowing then the gt40 and cobra upper? Is it smog legal?
 
Posted by 50DADDY (Member # 3076) on :
 
Which Systemax upper do you have?The stock replacement or the Systemax 2.The first one has stock style ports with revised runners.The second one has the rectangular runners.If you have a Systemax 1 you can use an oval port stock lower.If you have the Systemax 2 the truck lower will look like it will work but it wont.The runners dont line up quite right and you'll get cross runner leaks.Youll need the correct lower to use the Systemax 2.And GT40 is 100% different from a Holley.You could use an Explorer upper with the GT40 lower though.

[ December 04, 2012, 06:31 PM: Message edited by: 50DADDY ]
 




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