is it ok to run it like this ..werent older style motors just 8 or should i get the heades drilled....and the 1284 fel pro isnt tall enough on the runners what should i run

 

The LT1 intake and heads are set up for 12 bolts, 6 on each side. Part of converting a Gen 1 SBC intake to work with the LT1 heads (if that is what you are attempting to do - hard to tell from the question), is having the Gen 1 manifold drilled for the LT1 head bolt locations, and having the angle of the relief surfaces for the bolt heads corrected. Are you attempting to just use the outer 2 bolts on each corner of the intake to hold the manifold on correctly, ignoring the two center located bolts on each side?

 

i have an intake thats already `converted ex middle bolts on both sides the lt1 holes are to close for the single plane so it have ti match the heads to the intake holes

 

What I did on mine was after I got the 4 corner bolt holes set, I used them to bolt the single plane upside down and backwards to the single plane. Then I used a drill bit with a bronze bushing and drilled the remaining holes. Kind of a PITA but it worked, using a junk intake.

When I flipped it rightside up, I had to use a dremel to cut the area around the inside 2 holes on each side to get them to sit right...I cant remember the name of the tool I used on the outer ones, but I basically used it in a drill press with the intake mounted to it to cut flat spots aside the holes. Fits fine.

Then I had the intake welded up where the old holes were (some of them kind of overlapped) and redrilled the holes. Presto! It could use some porting, however. Good, tight fit.

 

thanks alot ,that sounds like a great idea im gonna give it a go ..ill let you no

 

BE CAREFUL. Think twice, cut once. I modified my intake because I'd rather do that than cut heads...however, dont go wild on them without taking a close look at what you are doing and thinking about it before you even pick up the tool...and speaking of, use the RIGHT tools.

I had access to a plethora of tools so for me it was a nobrainer.

If you mess up, you can almost bet you will need to have it welded up, then machined to flatten it out again, or replace it.

 

i hear you ive been starring at this thing for like an hour im still thinkin if i could do it or if i could just take it to a machine shop

 

Im currently finishing up my single plane conversion. When I had the bolt pattern done on my intake, my engine builder and I agreed to fill in the center 4 bolts, and just use the outer 8. You wont have any sealing problems doing this, unless you plan to shove like 30 lbs of boost through it.


Nick

 

thats what i needed to hear .someone else told me that and i knew there had to be someone running it like that .im sure someone will disagree but thanks

 

I've looked over the single-plane concept and considered one for my off-season upgrades, however, I decided to stay with the traditional LT4 intake (w/ some additional port work).

My thoughts are the LT4 intake should provide a broader power band with my stroker, whereas, the single-plane will typically place (improve) the power band primarily in the upper RPM range (i.e. 7K+).

WD

 

I dunno. I gained a little on the bottom end when I swapped to a single plane. Of course I had a bone stock intake on a 383 so that might have something to do with it.

I was suprised. It still ran fine without a tune. No driveability problems. No fuel pressure or hookup issues. And it didnt need a cowl hood. Most people complain about bucking and surging...even my cam surge went away. I have yet to get the tune updated though. I think my springs need some attention as well.

I'll get to it one of these days. I want to put in another motor, but I really gotta ditch my 10-bolt!

 

Very interesting information on the single-plane!

WD