TRIXLSXSUPRA

Can anyone shed some light on this for me?

The build i'm doing is a collaboration of a couple friends shops and so the engine supplied is an ERL 4 bolt superdeck 1 427 with ETP heads.

When i went to mock up the Holley hi-ram it was quite obvious that intake would not fit exactly to the heads!

I'm a bit green to the LSX world but catching on fast and doing as much research on them daily as my main role is to supply a decent chassis and plan out the rest of the build besides the motor and trans for now (Hughes PG rated to 3000hp)

Does anyone know what is required to machine the Hi Ram to fit?

Is there another bolt on intake to consider?

TIA

Pat

I'll post pics of the issue asap but i need to upload it to photobucket first....

TRIXLSXSUPRA

Here are the pics for reference and fwiw i double checked and my buddy said they are original ETP 4 bolt heads 12* 265cc that have not been decked or modified at all.

I'm sure i can mill the required amount off but just want to be sure i don't mess with the port alignment and/or mounting bolt holes / inj bungs etc.

I called the rep at Mast Motorsports as i guess that's where Carey from ETP went but not sure if he's still there or how to contact him to ask this specific question.

stevieturbo

Is the angle correct and it's just the head casting at the top holding it away ?

Or is it also the wrong angle ?

baggins

iTrader: (21)

Had the same issue with ls3 heads and the ls3 hi ram. The hump at the top of the intake port was interfering.

TRIXLSXSUPRA

To be quite honest i didn't spend that much time figuring it out yet as it was the end of a long 12hr day and i just wanted to get a feel for it on the heads and then saw that.

Need to remove the top and check down in there to see how everything looks.

So what was done to alleviate the issue?

Does anyone out there have a pic of their LS7 head with Hi ram that can post to compare?

LJMSJohn

Thats an issue with the head... the gasket surface around the port doesn't go high enough toward the valve cover rail.

TRIXLSXSUPRA

Thanks you for your time and reply i know you are a highly respected member here with lots of experience and knowledge.

If you're able to answer this great if not i'll dig deeper but can i just remove the heads and have them machined to extend the gasket surface around the port higher to allow the maniofld to sit down appropriately?

Was that a common thing for them to do to these heads?

Wierd thing again is after looking at the plastic intake that was on there it didn't have any issues so i'm guessing the FAST flange is actually slightly thiner than the Hi Ram

TRIXLSXSUPRA

FWIW here's a pic of it with a plastic intake on it

baggins

iTrader: (21)

ended up going cathedral

TRIXLSXSUPRA

Shiet! lol hoping this doesn not turn into a huge dilema

Not sure if i'm worrying about it too much but i'm a bit hesitant to machine the heads or the intake as to me it should be pretty straight forward fitment but i guess not.

Not sure if my buddy wants to consider switching heads or not that's up to him!

However if he wants to keep them we need to come up with another intake manifold solution and the only other thing i can think of besides a costly sheet metal piece is the GMPP single plane with a 6061 elbow but i'm not sure how much HP may be left on the table with that set-up vs the Hi Ram.

Could it be that Holley sent us the wrong intake?

Anyone know if there are PN#'s on the intake to reference?

TRIXLSXSUPRA

A local guy on another forum rec'd to machine in a step at the top of the flange to allow the manifold to sit down on the head completely flat.......sounded like a good idea to me instead of machine the heads themselves!

How does that sound to you guys?

I'll have my machinist buddy take a look and see what he thinks as well but keep the ideas coming please

LSmonster

iTrader: (2)

Don't freak out... Takes about 10 mins to fix using a mill or even a sanding disc.

TRIXLSXSUPRA

Awesome thank you for the reassurance and for the picture is that the same set up of heads and intake manifold?

If not what is the combination thanks

LSmonster

iTrader: (2)

Mast/ETP/Induction Solutions LS7 heads with a Holley High Ram intake. I've done it countless times with other intakes too... Even with their own intake manifolds... It's an easy fix.

TRIXLSXSUPRA

Just to follow up i was able to try the Hi Ram on a set of GMPP 6 bolt heads and this is what it looks like







You can clearly see how much difference there is at the top of the head



And you can see here how well the ports line up w/ very little to port match