Author Topic: Modifying a Parts Place reproduction 455 HO intake for Throttle Body EFI  (Read 1374 times)

SP Steve

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I bought a reproduction 455 HO intake from the parts place because I have an interest in possibly using a Holley Sniper system on my 71 Formula 400.  I put together a video showing the modifications.  I also have a video that shows what you can expect when buying a reproduction 455 HO intake.  There are some quality problems.

Youtube Videos:
https://www.youtube.com/watch?v=TAR89F7IXvk

https://www.youtube.com/watch?v=lrQFB-hNKqo&t=3s


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« Last Edit: June 28, 2018, 11:03:31 AM by SP Steve »

70RAIV455

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There have been a Ton of issuses with all makes and models Aftermarket Intakes.
Just Brodix, DART, Wieland prevail.
Chevy SB & BB Land.

China to blame where others are made now.
Strong Rumors E parta made there now.

Vintage OEM Used or NOS Best.
Gotta pay real $$$$ to own .

Offenhauser still good.
Not known for cutting edge Tech.

SP Steve

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China to blame where others are made now.

Vintage OEM Used or NOS Best.
Gotta pay real $$$$ to own .


The quality of this intake is pretty bad. I have it to a point where I can use it but it's not perfect. The only way to truely fix it is to weld on it, especially the runners where they mate to the head ports. But then I have to have it machined flat and it turns into a giant hassle.  I didn't want to cut up an original intake nor did I want to spend $650 to get one.

LeighP

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Did you consider the Professional Products Crosswind manifold? - basically a copy of the E'brock RPM....without a heat crossover.
I found that there was a small section of the bottom edge of the manifold along the sides that needed to be relieved, together with a bit of the lip on the valley pan where the manifold fouled it...but nothing I hadn't heard of with other aftermarket manifolds occasionally. The port casting on that repro manifold is really average, eh?

IMG_1438 by Leigh Peddell, on Flickr
Regards,
Leigh

Sydney, Australia
1968 Pontiac Firebird 428 5 speed coupe

Former Firebirds -
1969 Pontiac Firebird 400
1971 Pontiac Firebird 455
1977 Pontiac Trans Am
1976 Pontiac Trans Am
1967 Pontiac Firebird 400 convertible
1967 Pontiac Firebird 400 coupe


LeighP

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Nice consistent port casting....had no trouble with bolt holes lining up etc.

IMG_1430 by Leigh Peddell, on Flickr

Also, it takes both spreadbore and squarebore (with a thin adapater plate - supplied).

IMG_1451 by Leigh Peddell, on Flickr
Regards,
Leigh

Sydney, Australia
1968 Pontiac Firebird 428 5 speed coupe

Former Firebirds -
1969 Pontiac Firebird 400
1971 Pontiac Firebird 455
1977 Pontiac Trans Am
1976 Pontiac Trans Am
1967 Pontiac Firebird 400 convertible
1967 Pontiac Firebird 400 coupe



SP Steve

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Did you consider the Professional Products Crosswind manifold? - basically a copy of the E'brock RPM....without a heat crossover.

The port casting on that repro manifold is really average, eh?


A Performer RPM intake won't fit under the hood of my 71 Formula, otherwise I'd use one.  I've been in the car hobby for 43 years, it's the poorest quality intake I've ever owned.

71455formula

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I've done this with my car. Fits perfectly.
1971 LS5 Formula. It's on the road finally!
2013 GMC Sierra 5.3l 6 speed Diamond White(sold)
2013 GMC Sierra Denali 6.2 6 speed AWD (sold)

SP Steve

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I've done this with my car. Fits perfectly.

You have a Performer RPM on your Formula?

70RAIV455

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I have heard Good things and some Cons of the Crosswind Intake.
See how it works for Leigh.

Con I have heard is uneven fuel distribution.
It may not be true.
Street engines operated at crusing low rpm will show intake manifold problems or not.
Read all 8 spark plugs.
All should be exact same coloring present.
No lean or other cylinders running rich.

Seven

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I have been down this road with a Fitech 600 HP, Edelbrock Performer and MSD Pro Billet distributor.

Would be better off going with the new Edelbrock Pro Flo 4 set up and pick up multipoint injection for a few dollars more.
LT4 Firehawk
1979 Y84 T-top Delete
1972 Esprit 455 HO

71455formula

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I've done this with my car. Fits perfectly.

You have a Performer RPM on your Formula?

No. The 455HO intake with Fitech.
1971 LS5 Formula. It's on the road finally!
2013 GMC Sierra 5.3l 6 speed Diamond White(sold)
2013 GMC Sierra Denali 6.2 6 speed AWD (sold)

LeighP

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Did you consider the Professional Products Crosswind manifold? - basically a copy of the E'brock RPM....without a heat crossover.

The port casting on that repro manifold is really average, eh?


A Performer RPM intake won't fit under the hood of my 71 Formula, otherwise I'd use one.  I've been in the car hobby for 43 years, it's the poorest quality intake I've ever owned.

Yeah, I forgot the cowl height on a second gen is lower than a first gen......darn.....little less clearance.
Regards,
Leigh

Sydney, Australia
1968 Pontiac Firebird 428 5 speed coupe

Former Firebirds -
1969 Pontiac Firebird 400
1971 Pontiac Firebird 455
1977 Pontiac Trans Am
1976 Pontiac Trans Am
1967 Pontiac Firebird 400 convertible
1967 Pontiac Firebird 400 coupe


SP Steve

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I've done this with my car. Fits perfectly.

You have a Performer RPM on your Formula?

No. The 455HO intake with Fitech.

Great, I'm glad to hear it!  Do you have a thread showing the install? 

71455formula

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I've done this with my car. Fits perfectly.

You have a Performer RPM on your Formula?

No. The 455HO intake with Fitech.


Great, I'm glad to hear it!  Do you have a thread showing the install?


No. I do not. The only thing I had to do was machine out the base to accept the 4150 style gasket. Since the FiTech has a duel pattern for the mounting studs; it dropped right on like a stock Q-Jet. No spacer needed since it's the same height too. I did have to get a banjo style fitting for the return line and massage it a little bit right there due to it sticking a little further out than the inlet side. Once I get back from my deployment I can put some pics up. It was pretty easy though.
1971 LS5 Formula. It's on the road finally!
2013 GMC Sierra 5.3l 6 speed Diamond White(sold)
2013 GMC Sierra Denali 6.2 6 speed AWD (sold)

SP Steve

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I've done this with my car. Fits perfectly.

You have a Performer RPM on your Formula?

No. The 455HO intake with Fitech.


Great, I'm glad to hear it!  Do you have a thread showing the install?


No. I do not. The only thing I had to do was machine out the base to accept the 4150 style gasket. Since the FiTech has a duel pattern for the mounting studs; it dropped right on like a stock Q-Jet. No spacer needed since it's the same height too. I did have to get a banjo style fitting for the return line and massage it a little bit right there due to it sticking a little further out than the inlet side. Once I get back from my deployment I can put some pics up. It was pretty easy though.

That's cool.  I definitely want to use the factory style ram air air cleaner with the EFI unit, and if I don't have to modify it all the better.  I'd be interrested in seeing pics of your setup!


71455formula

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I've done this with my car. Fits perfectly.

You have a Performer RPM on your Formula?

No. The 455HO intake with Fitech.


Great, I'm glad to hear it!  Do you have a thread showing the install?


No. I do not. The only thing I had to do was machine out the base to accept the 4150 style gasket. Since the FiTech has a duel pattern for the mounting studs; it dropped right on like a stock Q-Jet. No spacer needed since it's the same height too. I did have to get a banjo style fitting for the return line and massage it a little bit right there due to it sticking a little further out than the inlet side. Once I get back from my deployment I can put some pics up. It was pretty easy though.

That's cool.  I definitely want to use the factory style ram air air cleaner with the EFI unit, and if I don't have to modify it all the better.  I'd be interrested in seeing pics of your setup!

I have to check my laptop to see if I have any pics. Otherwise it'll be after my deployment before I can get pics.
1971 LS5 Formula. It's on the road finally!
2013 GMC Sierra 5.3l 6 speed Diamond White(sold)
2013 GMC Sierra Denali 6.2 6 speed AWD (sold)

71455formula

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Sorry. I'll have to wait til i get back from this deployment before i can send some pics. I didn't have to mod the breather pan to make it work. I even took some clay and put it on top of the breather pan to check clearance. No issues there either.
1971 LS5 Formula. It's on the road finally!
2013 GMC Sierra 5.3l 6 speed Diamond White(sold)
2013 GMC Sierra Denali 6.2 6 speed AWD (sold)

SP Steve

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Sorry. I'll have to wait til i get back from this deployment before i can send some pics. I didn't have to mod the breather pan to make it work. I even took some clay and put it on top of the breather pan to check clearance. No issues there either.

I did the same with my car, I rolled up a cylinder of clay put it on the air cleaner and shut the hood.

737driver

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I’m doing a ram air intake on my LeMans with the Ram Air air cleaner intake. The RA air cleaner mounts easily enough to the Holley Sniper but I did have to add a 1/2 spacer to clear the fuel lines.
Jim
1979 Trans Am- Heritage Brown -W72 (Pontiac 400) -4Speed-WS6
1972 LeMans Convertible
1977 Trans Am
1972 Firebird
1971 Firebird
1970 Firebird
1977 MGB  Roadster Convertible

SP Steve

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I’m doing a ram air intake on my LeMans with the Ram Air air cleaner intake. The RA air cleaner mounts easily enough to the Holley Sniper but I did have to add a 1/2 spacer to clear the fuel lines.
Jim

Did it the air cleaner sit down correctly on the Sniper without the fuel lines?

737driver

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Yes it did, I did install a 120 degree AN fitting on the driver side rear inlet . I probably could have maybe used a banjo fitting (or similar) without a spacer. I also used the ram air bracket for the air cleaner and that worked out well, I did have the fab up a spacer mount to fit but that was pretty easy .
Jim
1979 Trans Am- Heritage Brown -W72 (Pontiac 400) -4Speed-WS6
1972 LeMans Convertible
1977 Trans Am
1972 Firebird
1971 Firebird
1970 Firebird
1977 MGB  Roadster Convertible

SP Steve

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Yes it did, I did install a 120 degree AN fitting on the driver side rear inlet . I probably could have maybe used a banjo fitting (or similar) without a spacer. I also used the ram air bracket for the air cleaner and that worked out well, I did have the fab up a spacer mount to fit but that was pretty easy .
Jim

That's all good news. It would important to me to set it up without the spacer though.

737driver

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The spacer only adds about 1/2” height which I don’t think would be excessive. The LeMans/GTO hood is setup a little different than the Firebird Formula. I wouldn’t think there could be a little more leeway with the Firebird. I plan on using the Sniper EFI on my 71 Firebird and add a Formula hood here eventually. I really like the Sniper and it works fantastic on the 455. The other thing is the Sniper has dual bolt patterns for manifolds which makes it easy for Pontiac intakes.
Jim
1979 Trans Am- Heritage Brown -W72 (Pontiac 400) -4Speed-WS6
1972 LeMans Convertible
1977 Trans Am
1972 Firebird
1971 Firebird
1970 Firebird
1977 MGB  Roadster Convertible

SP Steve

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Re: Modifying a Parts Place reproduction 455 HO intake for Throttle Body EFI
« Reply #23 on: October 12, 2019, 05:21:02 PM »
I finally installed the Parts Place reproduction 455 HO intake.  I planned to use the Holley Sniper TB EFI, but with the problems guys here are having I decided to get a Jet Stage 2 QJet and go with that.

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pancho400cid

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Re: Modifying a Parts Place reproduction 455 HO intake for Throttle Body EFI
« Reply #24 on: October 14, 2019, 10:59:24 AM »
Well....

If your set-up runs as good as it looks you'll be all set!

Please update everybody about the Jet Q-jet... looks great!
1978 Trans Am - Chesterfield Brown - current project
1978 Trans Am - Silver - SOLD!

SP Steve

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Re: Modifying a Parts Place reproduction 455 HO intake for Throttle Body EFI
« Reply #25 on: October 15, 2019, 07:47:17 PM »
Well....

If your set-up runs as good as it looks you'll be all set!

Please update everybody about the Jet Q-jet... looks great!

Thanks, I think it looks good as well.  I've made some preliminary adjustments to the carb, I set the electric choke to pull off sooner and did a quick idle mixture adjustment by ear.  The throttle response is much better than the old QJet, I noticed that immediately.  I'm getting ready to install headers on the car and once that is finished I'll set the idle mixture as best I can and call it good.

Re: Modifying a Parts Place reproduction 455 HO intake for Throttle Body EFI
« Reply #25 on: October 15, 2019, 07:47:17 PM »
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