rpm intake (not air gap) for 408w street car - Page 3 - Vintage Mustang Forums
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post #31 of 53 (permalink) Old 01-01-2017, 01:19 PM Thread Starter
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Im sure I will eventually upgrade, but I can go for the air gap or vic jr and do lower motor mounts at same time. or a cowl hood. Get me by for now, and the car currently has a stock block 302 in it now, so its gonna be way better than that
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post #32 of 53 (permalink) Old 01-01-2017, 01:27 PM
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Im sure I will eventually upgrade, but I can go for the air gap or vic jr and do lower motor mounts at same time. or a cowl hood. Get me by for now, and the car currently has a stock block 302 in it now, so its gonna be way better than that
You will be amazed at the difference even a mild 408W will make. It will have an insane amount of Torque. You will probably not feel the need to upgrade.
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post #33 of 53 (permalink) Old 01-01-2017, 01:45 PM Thread Starter
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You will be amazed at the difference even a mild 408W will make. It will have an insane amount of Torque. You will probably not feel the need to upgrade.
The 302 was also pushing 2.80 gears, now its got 3.70... never drove the 302 with 3.70, so its an all at once upgrade lol
be like a whole new car
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post #34 of 53 (permalink) Old 01-01-2017, 02:48 PM Thread Starter
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How much hp should I expect to make? with port matched rpm, hydro roller cam custome built (not ordered yet) and a 770 cfm street avenger? 10.2 to one c/r. Hooker 6208's
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post #35 of 53 (permalink) Old 01-01-2017, 03:20 PM
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How much hp should I expect to make? with port matched rpm, hydro roller cam custome built (not ordered yet) and a 770 cfm street avenger? 10.2 to one c/r. Hooker 6208's
The 2400 stall converter is going to limit your cam choice a little but 500Hp should be easily attained even with the RPM intake and small carb. It takes some real work to get a 408W to dyno under 500 at the flex plate.
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post #36 of 53 (permalink) Old 01-01-2017, 03:24 PM Thread Starter
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The 2400 stall converter is going to limit your cam choice a little but 500Hp should be easily attained even with the RPM intake and small carb. It takes some real work to get a 408W to dyno under 500 at the flex plate.
I dont mind bumping up the stall a bit, just trying to keep stall speed just under cruising rpm to not heat the trans up during car club cruises. The intake will eventually go away for a big single plane, but I gotta save up for either a cowl hood or ron morris motor mounts..... trying to do it all at once will kill the build. I'm already over budget lol. Been trying to buy the best I can even if I have to save for an extra couple weeks.
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post #37 of 53 (permalink) Old 01-01-2017, 04:39 PM
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I have a Victor Jr intake on my 427w and I wish I woulda went bigger. I also do run a 1/2" carb spacer. For a 408, I'd go Victor Jr. at the minimum.


1969 MaCh 1 - CHP 427w 10.8 comp
460 rwhp / 489 rwtq SAE

TFS 205cc 11R heads || Vic Jr. intake || Holley 950HP || 14" 6 piston / 13" 4 piston Wilwood brakes || T56 Magnum || SPEC 2+ hyd clutch || Detroit Locker || 3.70's || Aluminum DS || TCP R&P || TCP 1 1/8" front sway bar || TCP front adj coilover's || TCP Panhard Rod & rear sway bar || Maier rear leafs || Bilstein shocks || Forgeline GA3C wheels - 18"10", 19"x12" 325/30
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post #38 of 53 (permalink) Old 01-01-2017, 07:08 PM
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I have a Victor Jr intake on my 427w and I wish I woulda went bigger. I also do run a 1/2" carb spacer. For a 408, I'd go Victor Jr. at the minimum.
I see you are running your air cleaner up into the Mach 1 scope. I have debated if I want to cut the stock hood up in my 69 and run the air cleaner up through the hole so I can run a taller intake on my 408w as well.


Do you have stock height or drop motor mounts?

Sharp looking 69 by the way!

Last edited by SVTguy; 01-01-2017 at 07:13 PM.
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post #39 of 53 (permalink) Old 01-01-2017, 07:42 PM
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I see you are running your air cleaner up into the Mach 1 scope. I have debated if I want to cut the stock hood up in my 69 and run the air cleaner up through the hole so I can run a taller intake on my 408w as well.


Do you have stock height or drop motor mounts?

Sharp looking 69 by the way!
Thx!

I just installed some 1/2" drop mounts recently, so I have room to run up to a 1" spacer now. But otherwise, without the 1/2" drop motor mounts, I was able to fit everything in there with a 1/2" spacer with zero issues.


1969 MaCh 1 - CHP 427w 10.8 comp
460 rwhp / 489 rwtq SAE

TFS 205cc 11R heads || Vic Jr. intake || Holley 950HP || 14" 6 piston / 13" 4 piston Wilwood brakes || T56 Magnum || SPEC 2+ hyd clutch || Detroit Locker || 3.70's || Aluminum DS || TCP R&P || TCP 1 1/8" front sway bar || TCP front adj coilover's || TCP Panhard Rod & rear sway bar || Maier rear leafs || Bilstein shocks || Forgeline GA3C wheels - 18"10", 19"x12" 325/30
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post #40 of 53 (permalink) Old 01-01-2017, 09:38 PM
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Thx!

I just installed some 1/2" drop mounts recently, so I have room to run up to a 1" spacer now. But otherwise, without the 1/2" drop motor mounts, I was able to fit everything in there with a 1/2" spacer with zero issues.
Cool thanks, and your hood scope is still the stock Mach 1 scope?

I might have to really think hard on running a Vic Jr then.

Last edited by SVTguy; 01-01-2017 at 09:41 PM.
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post #41 of 53 (permalink) Old 01-01-2017, 09:47 PM
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Cool thanks, and your hood scope is still the stock Mach 1 scope?

I might have to really think hard on running a Vic Jr then.
Yeah stock hood scoop. Also, forgot to add, I don't run the metal grill in the scoop. I also grinded down the nubs and rib where the bolts for the metal grill bolted onto inside of the scoop for a cleaner look. I don't remember if it was necessary, but it's very easy to do since the scoop is fiberglass.


1969 MaCh 1 - CHP 427w 10.8 comp
460 rwhp / 489 rwtq SAE

TFS 205cc 11R heads || Vic Jr. intake || Holley 950HP || 14" 6 piston / 13" 4 piston Wilwood brakes || T56 Magnum || SPEC 2+ hyd clutch || Detroit Locker || 3.70's || Aluminum DS || TCP R&P || TCP 1 1/8" front sway bar || TCP front adj coilover's || TCP Panhard Rod & rear sway bar || Maier rear leafs || Bilstein shocks || Forgeline GA3C wheels - 18"10", 19"x12" 325/30
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post #42 of 53 (permalink) Old 01-02-2017, 08:39 AM
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I too didn't want to cut my hood so I went went with RPM, mine made 545hp 497fts on the dyno with it so I don't really feel it hurt me that much.
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post #43 of 53 (permalink) Old 01-02-2017, 09:09 AM
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Your RPM will always be worth the boat-buck you spent on it if you decide to upgrade but after 550hp when is enough enough unless you are seeking ETs.

Heavy Metal Thunder Video http://www.youtube.com/watch?v=cW3L_O7N_xs
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post #44 of 53 (permalink) Old 01-02-2017, 10:59 AM
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Have run all the intakes mentioned on SBFs. Depending on the build which is picked can make a night and day difference. I have also flowed most of them on a flow bench attached to a head.

If hood clearance is needed a torker II flows almost identical to a VrJr with in a couple CFM.

As far as the air gap vs RPM there isnt much difference at all definitely not worth the extra 100.00
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post #45 of 53 (permalink) Old 01-02-2017, 11:39 AM Thread Starter
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I too didn't want to cut my hood so I went went with RPM, mine made 545hp 497fts on the dyno with it so I don't really feel it hurt me that much.
More info on your combo?
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