slammed98gmc

I marked the intake and Lloyd drilled the holes and spot faced the bolt holes for me with his bridgeport mill. He just mocked stuff up to find the right angles. Ive got 5 bolt holes on each side of the intake, I got 1 in the middle on both sides. Due to the runner placement, I was only able to 1 bolt in the center on either side. Im almost sure 2 bolts on either corner would work out, but I went ahead and drilled the 2 extra holes.

WS6 TA

Nice… my first thought when I saw it was that there is no way that will fit under a stock f-body hood…

I did something similar but used JB weld instead since I was concerned that by the time I got everything all welded up that the flanges might warp… after some careful sanding, grinding and a coat of paint you couldn’t tell.

WRT to the port height question… vortec heads have ports fairly similarly shaped to LT1 heads, I’d be surprised if there was much room to take advantage of anything.

The extra plenum volume should help HP, but might hurt responsiveness some, OTOH, anything underneath that intake that is serious enough to need that probably will be fine with the extra plenum volume.

slammed98gmc

This plenum is from 360 performance and is supposed to fit under the stock f body hood. Minus the 1 1/2 tall nitrous plate. I thought I was going to have plenty underhood room and had to trim the brace on my steel cowl hood to get it to fit. The vortec ports where almost identical to the fully ported trickflow heads. Lloyd did very little work to get those matched up to the lt4 race gasket.

WS6T3RROR

Any chance of getting the angles from lloyd if he remembers them? Thats about the only thing stopping me at the moment since I dont want to buy a set of heads just to measure that and mock up with.

MarcR94v6

can;t wait to see dyno numbers.

slammed98gmc

you can email and ask him, but i dont think that he measured anything, he just mocked up heads in his fixture and found the right angle and drilled them.

slammed98gmc

I dont do dynos, the last time I was on a dyno, I left transmission parts and fluid all over nitrodaves dyno.

LT4BLAZER

Build a plate jig so the holes dont get supersized and they are all drilled the same angle that way. Lloyd then spot faced it for me.

MarcR94v6

Fair enough. Perhaps track times.

Maybe a dumb question, but can this be made smogable? I first doubted it earlier in the thread, but I'm not seeing anything specific that would change emissions.

SS RRR

It has the tendency to fail a visual inspection therefore it is not emissions compliant. Functionally yes it could be made to pass e-check, but if you have an overzealous "tech" notice the manifiold not belonging on the car then it'll fail.

Speed Density

NX Gemini plate eh?

Seems like Im seeing a lot of these latley

WS6T3RROR

The abscence of the egr valve would probably get you a fail on the emissions test too. Depends on the state of the engine you're having tested and what cam is in it.

Thanks for posting picks of the bolt holes lt4blazer. I think I know how i'm gonna do it when now when I get some free time.

97formulakid

That intake is CLEAN!!! I am going to be ordering a Victor E in the next few months and need someone to modify it to work with LT1 heads.

Who did all your intake work??? I know you said Lloyd did your drilling but who did the welding up of the other holes?

slammed98gmc

We just had a local guy weld up the old holes and we cut the un-needed parts off and smoothed it out ourselvse with die grinders and a sandblaster.

slammed98gmc

well it runs, hope to get it to the track in the next few weeks and see what it does.

short video