Small Block Intake

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texas360

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I am running a 360.. Stock Bottom end, Aluminum Heads, Whiplash Cam, Long tubes, 3:55 gears with a reverse manual vb.. Currently i run a Edelbrock Performer intake, with a Edelbrock 1406 Carburetor./. the Performer seems to lose steam quick.. is there really a difference between the Performer RPM and the Performer RPM Air Gap? looking to upgrade intakes and maybe add a Holley 670 Street avenger? Just a street car..
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I'm no expert or guru, but if you want to upgrade your carb anyway, try that first. It's easier than an intake swap and there is lots of info on Holley tuning out there to simplify that process. Also, I started with a 670 Street Avenger on my similar 360 and when I went to the 750 double pumper, I wish I had just gone there first.

Cley
 
Sure it's the performer intake losing steam?
What cam? What ignition? Timing advance working and dialed in?
 
Sounds more like carb than intake. I have a 1406 on my 273. You could use a 750 or bigger on a juiced up 360. Feed the beast.
 
I am running a 360.. Stock Bottom end, Aluminum Heads, Whiplash Cam, Long tubes, 3:55 gears with a reverse manual vb.. Currently i run a Edelbrock Performer intake, with a Edelbrock 1406 Carburetor./. the Performer seems to lose steam quick.. is there really a difference between the Performer RPM and the Performer RPM Air Gap? looking to upgrade intakes and maybe add a Holley 670 Street avenger? Just a street car..View attachment 1715757359
What’s “loose steam quick?”
The intake isn’t the big issue I think. It would help but not in a big way. 750 car IMO.
Post the cam specs & lifter style please. I know they're not big cams.
 
I am running a 360.. Stock Bottom end, Aluminum Heads, Whiplash Cam, Long tubes, 3:55 gears with a reverse manual vb.. Currently i run a Edelbrock Performer intake, with a Edelbrock 1406 Carburetor./. the Performer seems to lose steam quick.. is there really a difference between the Performer RPM and the Performer RPM Air Gap? looking to upgrade intakes and maybe add a Holley 670 Street avenger? Just a street car..View attachment 1715757359
HR mag did that test. 2.1 horspower difference.
 
If you shop for another carb, I'd stay away form the 670 SA carb. There are many better carbs out there that'll work IMO.
 
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That setup should hold up pretty good on mid-range and top end. How are your valve springs? And is your ignition system up to snuff? It seems that setup should pull strong to around 6,000.
 
I went to the Performer RPM and it is fantastic! I also had the 1405 600cfm Carb. My 360 is similar to yours and I went to the AVS-2 650 and it's is way better than the 600.
 
Any Holley-based 750 DP. I'd bet a regular ol 7779 Holley would smoke a 670 SA on the OP's combo. I know it did on my mild 340.
Glad I read this - I was looking at using a 670 SA to replace my Eddie 1406 since it also seems to be running out of steam in higher RPM’s on my mild 340.
 
Glad I read this - I was looking at using a 670 SA to replace my Eddie 1406 since it also seems to be running out of steam in higher RPM’s on my mild 340.

Keep in mind that '670' has the same throttle bore and venturi sizes as a regular ol Holley 1850 '600.' Not sure how they claim it flow 670 cfm. Who knows... All I know is that it was a dog on my 340.
 
Keep in mind that '670' has the same throttle bore and venturi sizes as a regular ol Holley 1850 '600.' Not sure how they claim it flow 670 cfm. Who knows... All I know is that it was a dog on my 340.
Also trying to figure out if maybe I picked the wrong cam - What are the specs of your 340?
 
I never ran anything smaller then a 750 - 4 corner on any large cam small block. I like the mid to High RPM pull. . Cut the fuel off idle and let it flow wide open. Use the air bleeds . The best now is to get blown and then inject it. LOL . But with a good carb tuning you can let r rip tater chip







3850 lbs with the driver through the exhaust. Not a stutter off idle 10.50's


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A lot of darts being thrown at the board, the OP hasn’t followed up on giving specifics for some reason. So, off the little detail given what I’d do is forget about expecting big gains with intakes or carbs and yank that cam and slide in something more appropriate. If the OP for one second thinks his combo needs more intake and/or carb with what he’s got...........:rolleyes:
 
I’m going to call “foul” here.
First off...... it’s a BBC, not a SBM.

Secondly, that test is an RPM vs an RPM A/G.

The OP is asking about going from a std Performer to a Performer RPM.

On the right build, the difference in power between those two on a SBM could be pretty sizable.
The question is....... how much different will it be with the OP’s combo?

I wouldn’t expect too much.

We had a low CR 360 on the dyno here last year(not built by us).
SM heads that were checked out, rpm intake, headers, 750 Ede carb, XE268 cam, PRW 1.5 rockers.

Peak tq was actually more of a small plateau...... mid-360’s from 41-4700, with the highest number being 367.8@4600.
Peak hp was 331.5@5200.

Started the pull at 3000 where it was making 345.8tq/197.5hp.

Ended the pull at 5600 where the numbers were 298.2tq/317.9hp.

It was surprisingly low.
The intake and 750 didn’t work any magic with that one.
 
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Ya fouled that one up. Isnt the performer the small kinda medium port manifold? Still kinda proves the air gap does little for power.
 
Looking at the combo info you provided, it seems 'performance' is the goal. The cam could be the limitation here, so going to a RPM intake &/or bigger carb may not do much if the cam is too small.

I see a thick spacer under the carb. If it is a 4 hole, converting it to a 2 hole will allow the engine to 'see' all the carb cfm & should improve top end. This might get you where you want to be using existing parts & should certainly be tried first.
 
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