HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
#1
HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
Hey guys been searching this forum for a while and finally joined. New to the forum but not to third gens. It's time to upgrade the TPI intake on my 91 z28. My question is between these three intakes, which is better? My car has the 3.42 rear gear. Im looking at adding a cc503 cam. The tpi as some of know leaves us wanting more. Im not looking to all out drag race with this car. Just want something a bit better than the tpi. Not really looking for anything to turn much higher than these intakes allow. Here is what I have observed and im looking for opinions from someone who has personal experience or knowledge of them.
HSR-Good intake overall, allows you to reuse a TPI throttle body. Ive noticed most say these favor a larger cubic inch such as 383 or bigger. Cheapest option out there for the money.
GM Ram Jet-similar to the HSR. From all the dyno results ive seen it looks like it is tip for tap with the HSR. Doesnt have as much plenum volume as HSR. Cost more money and requires a LS throttle body which requires a different throttle cable to be utilized.
Edelbrock Pro Flo XT- looks to be similar to the GM ram jet. Cost more than HSR but a little less than GM ram jet. It also requires a LS throttle body and different throttle cable. I havent been able to find much info on this intake.
The question is which would be most beneficial on a mostly stock bottom end 350? Im not looking to go the 383 or other stroker options. I realize I will lose some bottom end torque but would like the intake that will work best to help get the most torque down low yet be much flatter than tpi. Sounds complicated im sure but would like to hear some opinions on which of these would be better. My engine when done will be around 9.5:1 compression ratio with a set of vortec heads that has been machined for higher valve lift and screw in studs. I would prefer to keep the happy medium 3.42 gears out back. Car is not a daily driver but would like to drive out of town from time to time. Id appreciate feedback on some of these intakes. Thanks TGO
HSR-Good intake overall, allows you to reuse a TPI throttle body. Ive noticed most say these favor a larger cubic inch such as 383 or bigger. Cheapest option out there for the money.
GM Ram Jet-similar to the HSR. From all the dyno results ive seen it looks like it is tip for tap with the HSR. Doesnt have as much plenum volume as HSR. Cost more money and requires a LS throttle body which requires a different throttle cable to be utilized.
Edelbrock Pro Flo XT- looks to be similar to the GM ram jet. Cost more than HSR but a little less than GM ram jet. It also requires a LS throttle body and different throttle cable. I havent been able to find much info on this intake.
The question is which would be most beneficial on a mostly stock bottom end 350? Im not looking to go the 383 or other stroker options. I realize I will lose some bottom end torque but would like the intake that will work best to help get the most torque down low yet be much flatter than tpi. Sounds complicated im sure but would like to hear some opinions on which of these would be better. My engine when done will be around 9.5:1 compression ratio with a set of vortec heads that has been machined for higher valve lift and screw in studs. I would prefer to keep the happy medium 3.42 gears out back. Car is not a daily driver but would like to drive out of town from time to time. Id appreciate feedback on some of these intakes. Thanks TGO
#2
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Car: 87 Iroc
Engine: modified 350
Transmission: high performance built 700R4
Axle/Gears: Strange S60 3:73
Re: HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
Out of the three mentioned and what I have read on this board, the Stealth Ram is your best bet.
#3
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Re: HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
Another vote for the HSR. ....although I'm personally in favor of a fully ported SLP long runner set up. In fact, Steve Mack did the porting work on the one I'm running now!
I've heard the ramjet is a nice piece, and the numbers seem to back it up, but it's not overly common. (which could be good thing). I looked at the pro flow too, but the finish seems to leave a lot to be desired. Needs port and cleanup work to see it's full potential. The HSR is cheap, and works great right out of the box.
I've heard the ramjet is a nice piece, and the numbers seem to back it up, but it's not overly common. (which could be good thing). I looked at the pro flow too, but the finish seems to leave a lot to be desired. Needs port and cleanup work to see it's full potential. The HSR is cheap, and works great right out of the box.
Last edited by Abubaca; 06-09-2015 at 08:33 PM.
#4
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Car: 92 Trans Am
Engine: 383 Stealth Ram
Transmission: 4L60
Axle/Gears: 3.42/10 bolt
Re: HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
I have the HSR on my car. Drawback is hood clearance. My stock TA hood bracing needed to be cut by the throttle body. One thing to consider is where the intake makes its power. It is designed to run at higher RPM. The stock TPI setup is truly better for making low end power once you have some porting work done. Looking back, I wish I would have just done an LS swap...but that is another story.
#5
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Re: HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
The stock TPI setup is truly better for making low end power once you have some porting work done.
#6
Re: HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
Thanks for the replies. I know I can get the RamJet and the Pro Flo for vortec heads. I can't seem to find the stealthram for vortec heads except the polished version and man did it hurt my feelings.
I havent really found much info on the pro flo intake. I can find some on the ramjet and it seems pretty decent. Pro flo is a little cheaper and I do like how it looks a little better than the ramjet. I just want the best bang for the buck. I know the stealthram wins there if it is still offered by holley. Can anyone confirm if Weiand still makes the satin intake?
I havent really found much info on the pro flo intake. I can find some on the ramjet and it seems pretty decent. Pro flo is a little cheaper and I do like how it looks a little better than the ramjet. I just want the best bang for the buck. I know the stealthram wins there if it is still offered by holley. Can anyone confirm if Weiand still makes the satin intake?
#7
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Car: 1991 Firebird
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Axle/Gears: 3.27, I think
Re: HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
Holley's website doesn't have the satin vortec HSR listed anymore. I tried the part number 7542 and Summit Racing said it's unavailable.
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#8
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Car: 89 IROC
Engine: 6.8 HSR N2O
Transmission: TKO 600
Axle/Gears: 9" Moser 3.50 True trac
Re: HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
Running HSR too and don't have any experience with the others but it runs very well. Still blows the tires out in first and second will still spin them but I'm running a well built 400. The only draw backs are hood clearance and distribution. The stock TB rubbed but my 58mm hits hard. This may be worse because of my AFR heads and thick intake gaskets so it may not be as bad with the vortec heads.
However fuel distribution, more precisely air distribution is probably still going to be an issue. It will still run well but I get a noticeable difference in plug readings between the front four and rear four. I think it's the tunnel ram heritage that's the problem.
If I were doing it over I would probably go single plane.
However fuel distribution, more precisely air distribution is probably still going to be an issue. It will still run well but I get a noticeable difference in plug readings between the front four and rear four. I think it's the tunnel ram heritage that's the problem.
If I were doing it over I would probably go single plane.
#9
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Car: 87 Iroc
Engine: modified 350
Transmission: high performance built 700R4
Axle/Gears: Strange S60 3:73
Re: HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
Are you using poly mounts or factory rubber ones. The stock ones are said to lower the motor a little bit.
#10
Re: HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
It's the short runner, log style open plenum with TB in the front. Same issue with the Miniram and LT1 style manifolds. Except GM got smart and cast in some idle air distribution passages to compensate for that effect.
this is how I solved that problem on my miniram....
https://www.thirdgen.org/forums/diy-...ram-split.html
this is how I solved that problem on my miniram....
https://www.thirdgen.org/forums/diy-...ram-split.html
#12
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Car: 89 IROC
Engine: 6.8 HSR N2O
Transmission: TKO 600
Axle/Gears: 9" Moser 3.50 True trac
Re: HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
It's the short runner, log style open plenum with TB in the front. Same issue with the Miniram and LT1 style manifolds. Except GM got smart and cast in some idle air distribution passages to compensate for that effect.
this is how I solved that problem on my miniram....
https://www.thirdgen.org/forums/diy-...ram-split.html
this is how I solved that problem on my miniram....
https://www.thirdgen.org/forums/diy-...ram-split.html
#13
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Car: 87 Iroc
Engine: modified 350
Transmission: high performance built 700R4
Axle/Gears: Strange S60 3:73
Re: HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
When the Edlebrock Pro Flo first came out I read a car magazine build on it.The horse power numbers were pretty disappointing.
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Car: 1991 RS
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Transmission: 700r4
Re: HSR vs GM Ram Jet vs Edelbrock Pro Flo XT
Running HSR too and don't have any experience with the others but it runs very well. Still blows the tires out in first and second will still spin them but I'm running a well built 400. The only draw backs are hood clearance and distribution. The stock TB rubbed but my 58mm hits hard. This may be worse because of my AFR heads and thick intake gaskets so it may not be as bad with the vortec heads.
However fuel distribution, more precisely air distribution is probably still going to be an issue. It will still run well but I get a noticeable difference in plug readings between the front four and rear four. I think it's the tunnel ram heritage that's the problem.
If I were doing it over I would probably go single plane.
However fuel distribution, more precisely air distribution is probably still going to be an issue. It will still run well but I get a noticeable difference in plug readings between the front four and rear four. I think it's the tunnel ram heritage that's the problem.
If I were doing it over I would probably go single plane.
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