Will the Lt-4 intake increase performance? I'm going to put my cam in this weekend and was going to get the intake and put it on to. I have stock lt-1 heads.Do I have to port match them to use with the lt-4 intake?

Thanks Wes
mods: cai, 52mm tb,flowmaster catback,gutted cat, hpp3,4:10's
125 shot nos,hella headlight conv.

 

yes, you will need the lt1 heads port matched

 

Just find a set of LT4 heads to go along with it

 

Do a search for posts on this subject by "Arnie".... he has all the facts. The LT4 intake requires machining to fit on the LT1 heads. There is an interference in the area of the valve cover rails. I have never seen one bit of evidence that the LT4 intake, after machining to properly fit on LT1 heads, will produce any sort of power increase, or even if it will support the LT1 heads as well as the LT1 intake. The LT4 intake takes major internal work to support high flowing LT4 heads.

 

I agree with Fred's post, including doing a search for additional info in addition to what is posted in this thread.

If Fred's sound advise is to be bypassed, and the decision to mate the two is still made, there are two routes to take, that will allow bolting the LT4 intake to LT1 heads.

In addition to the one stated in Injuneer's post, the other requires the manifold surface of the heads to be milled moving the step (on that surface) 1/4"-5/16" closer to the valve cover mtg. surface. Following this, the head will accomodate an unmodified LT4 intake.

Each method/option has it's own negative. Removing the stock from the intake will disallow any future roof porting inside the manifold intake port. Removal of this stock can however, be removed by hand, with a hand grinder. If utilizing the second option, milling the mtg. face of the head itself, to that similar to an oem LT4 head, will allow the use of an unmodded lT4 intake. This will thus allow the option of additional material removal from the roof, of the manifold intake port, in the future, is so desired. The downside, a setup in a milling machine is required to perform the head milling operation. Hope this double team has helped clear up any misinformation.

 

Um did anyone answer this part yet???? I'm sure its yes but by how much? Is it even worth it?

See Fred guys think too way up on a higher level. Smart *****.... God bless um.