[Formulajones]

Originally Posted by Formulas

I have never seen a OE iron intake with near as much misalignment as the repop aluminums, They do a fine job on the externals but the mold placement for the internal runners leaves alot to be desired, Its not so bad to have the material there to remove to make right but when material is flat out missing or a divider is kicked way over .. no thanks

You'll have to do some more searching, there have been plenty of pics posted all over this forum of misaligned factory iron intakes. Misaligned factory raIV and HO intakes. The mold for the repop was from one of those factory manifolds. So you get what you get, the same thing Pontiac did 50+ years ago.

I've messed with enough of the repops to know they work. Dividers kicked over I have never seen so not sure what you're talking about there. Port alignment sure, but nothing overly alarming or different than Ive seen on factory intakes.

I really think this stuff has just gotten so blown out of proportion everyone has gotten gun shy and most of the commenters just follow the herd so to speak without any real experience with it.
Like Paul mentions, thousands sold and only a few returned? Those few are all you'll ever hear about in a public forum because that's how people are. Ya just have to take it with a grain of salt, do your own thing and not worry about the few

[242177P]

Problem solved. Darbikrash makes a nice (blower) manifold
and he's going to make a custom lid for the shaker guys.

[nas t eh]

Thanks all for the comments, I have followed this topic here for some time and I have been hesitant to get a HO copy, but not any more and I’m certain once its on I’m going to wonder why I didn’t sooner.

[scott70]

I’ve port matched a few iron intakes to a ra4 gasket,,, gets a little close at the top. I ordered an after market ra4 intake hoping it would be close. After laying on the ra4 gaskets for a port match it was paper thin coverage at the top of the port in a few places. The iron intakes were always much better in that area. For me to feel comfortable using that aluminum intake I would have needed to add some weld at the top for a good seal. I sent it back.

https://forums.maxperformanceinc.com...d.php?t=874887

[Jay S]

If you can find one, the very last production runs Edelbrock did of the PB4 intake that was a spread bore pattern were probably the best dual plane Aluminum intakes made that work with all the standard shaker and RA pans, performance was pretty equal to a stock intake. Why Edelbrock dropped it and went with the performer has always been confusing to me. I don’t know, but possibly short comings on the performer go back to Edelbrock trying to make EGR provisions with the performer design, which made some of the runner smaller. I have never seen a Performer for a Pontiac with the EGR provisions, but I have understood they do exist? In that time frame Edelbrock made similar changes for EGR compliance, on other brands, making there stock replacement intakes worse.

Here is a PB4 side by side with a modified stock intake, you can see it has more volume on some of the runners. Personally I am not willing to trade the RPM intake for a design that fits a shaker. I love the RPM intakes. I would certainly trade the performer design for the PB4 though!

[ponjohn]

Originally Posted by GOAT8U2

If you scanned one, there's great things going on with 3d printing these days, carbon is crazy expensive but the point being, if you want it bad enough, you can make a better one.

Hell I made a 12-1 bolt on crank trigger kit for us, not cheap to design or fast but it's awesome to have done it. I guess if could recoupe if I offered it for sale so you could too.

Do you mean carbon fiber filament?

[PAUL K]

Yes there was a Performer EGR version.

All the P4B's have a flat carburetor pad and cause issues with the shaker fitting as they came from the factory.

Every QP4B I've seen has issues fitting with an HEI. The rear runners sweep back towards the firewall and make it a real tight fit for the distributor. I'm pretty sure there is only one Q-jet version and it was most likely put into production around 1973.

Edelbrock replaced all the x4B manifolds with the Performer. Some possible reasons; EPA legal designs, improved modern runners, spread bore or square bore compatibility, having the ability to accept current bolt on accessories and re-selling the "new and improved" manifold to current x4B manifolds. I remember the magazines pushing the modern designed manifold and talking about how great it worked. This was the early 80's and there were millions of late model "performance" vehicles on the road that needed all the help they could get.

[Skip Fix]

Some pictures in here of my SR 72 HO intake and the Repop RAIV. several areas even the bottom corners had to have weld added as they were maybe 1/16" sealing. I have seen a lot of factory intakes and none were as bad as the repops. The SR HO I bought new in 79 was about D port sized and yes different port sizes but there is plenty of material around them to seal even a slightly taller port than the 1233 gasket.
https://forums.maxperformanceinc.com...ht=RAIV+intake

[reacp911]

My car has the EGR version, #3156. I don't have a pic handy. I'm likely an outlier in the car hobby community in that I like to keep all the emissions equipment when possible.

As a result, I'm running fully function egr and cats on a '75 car. The dual cats are 200 cell metallics. In the brief time I tried running no cats, I realized I could not be in the garage with the running car and not have to wash my clothes to get rid of the smell.

The emissions equipment once saved my car. The car was running in the garage and all of a sudden, the idle speed went up? There is a switch that goes to manifold distributor vacuum on a hot engine to up fan speed. What had happened is that the thermostat failed closed (for the second time!!).

I've only deleted the EFE as it won't work with the aluminum heads and is not needed with the aluminum performer.