rpm airgap vs the m1 single plane

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o1heavy

o1heavy

1974 dart sport
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Running standard stroke 360 in my 74 dart sport
The best et with my fresh 360 /xheads and 509 purple cam
12.32 that is with the m1



Anybody think the airgap would help me with the 60's
 

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IMO, yes it will.

Run a 1" open spacer on it for best results is my guess.
 
Curious if the M1 has anything done to it?
The entry area at the plenum stock is a POS for sure. I can't even believe it leaves the floor the way it comes stock.
 
It's plenum design is for use of the TQ in class racing.. With the TQ on top, the entrance is OK. Some work can be done to improve the flow with the TQ, but over all, it's OK.
Not to bad for the Holley either, though after plenum work is done for the Holley, it's really nice.

I'm with cracked! You'll improve a little on the 60' times and lose nothing up top. The cam is still a bit mild for a single plane unless you have a dedicated race car ignoring everything below 3500 rpm. At this point I believe the M1 is a little better in HP.
 
The m1 has a little work done to it but not to much
it is a street car but just trying to get all I can out of the setup
I put hughes 1.6 rockers which I think makes it 540 ish and a new 4200 dynamic converter which did help get it moving
 
Thinking I might give the airgap a try this will take a little I have not purchase one yet but I will update you folks with the results
 
Yes! Do the airgap! I switched the other way in preparation for a blow thru turbo setup, and lost power. My 60 ft times went from 1.60-1.61 with the airgap to 1.67-1.68 with the M1, a definite loss of torque. The mph is about the same, but I no longer have an 11 sec car. I'm a little bummed about it, but daydreams of turbocharged awesomeness keep me from going too crazy.
 
UOP said:
Yes! Do the airgap! I switched the other way in preparation for a blow thru turbo setup, and lost power. My 60 ft times went from 1.60-1.61 with the airgap to 1.67-1.68 with the M1, a definite loss of torque. The mph is about the same, but I no longer have an 11 sec car. I'm a little bummed about it, but daydreams of turbocharged awesomeness keep me from going too crazy.
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You might want to try different pump cams. I know when I switched from my Air-gap to a Victor I lost about 0.05 in the 60' (but I gained 1.5 mph). I got the 60' time back to normal after changing pump cams and raising the launch RPM by 500....just something to try.

For the OP, Yes to the Air-gap.
 
flyfish said:
You might want to try different pump cams. I know when I switched from my Air-gap to a Victor I lost about 0.05 in the 60' (but I gained 1.5 mph). I got the 60' time back to normal after changing pump cams and raising the launch RPM by 500....just something to try.

For the OP, Yes to the Air-gap.
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I didn't think about pump cams. I did have to take a little jet out of it, so maybe my current pump cam/nozzle configuration is making it lazy. I'll give it a shot.
 
what i did to my buddies M1 was to epoxy the sides of the plenum to take a bunch of volume out of it. this helped get the air speed up and improved his 60's. maybe you might consider doing that to yours.
 
UOP's cam is much smaller in duration. Just a note.
 
depending on your budget...

i'd stick with what you have this season, work toward consistency. race skills.

instead of tweaking, changing, retrofitting intakes and stuff, find/get a higher compression engine ready for next year.

the 360 base compression is not so hot. the x heads were good back in the day. but now they are not optimal.
no amount of porting and tweaking are going to give you huge improvements.

shoot for good compression, like 10.5:1 or so, a set of alum heads, a holley 750 double pumper, good fuel supply. chassis/slicks that hook. work toward that for next year.

your best bet would be look around on here and moparts for someone getting rid of a good small block, upgrading their car to a big block. in other words, if they already have a running small block 360 that they invested in, had all the machine work done, and have aluminum heads on it you can get a heck of a deal if they are upgrading to a big block or new hemi or something.

just my opinion. small tweaks to intake/cam will not get you into the 11's. or carb jetting. you should set your goal for 11's, plan & seek and snag a deal on an engine. run what you got for now, save a little bank, and jump at the chance when you get it.

that being said the air gap is gonna do well for you. what's sitting on top is important too.
 
Here is a little info on my engine
Kb190s with the xheads I think it is a little over 10 to one
Mopar 508 cam with hughes 1.6 rockers
4 10 gear /727 trans Rmv /4200 dynamic converter
Really old inch and 5/8 headers / m1 single intake
No power steering or brakes weighs. 3300


I do have plans for building a 408 / I was justify the air gap cause I think I can use it in both engines
L
 
Not sure what youre lower end is - is it factory stock? What gears are int he car?Did you degree that .509?
My suggestions before you replace the intake would be to degree the cam and then advance it 4°. If you haven't replaced the pistons - and the times tell me it's got some compression - look into building a bottom end with decent pistons. The 4200 convertor will mean you don't need (or shouldn't need anyway) that torque. You're leaving at close to peak torque now so lowering it does nothing. You might also want to try a tapered 4-hole spacer on the M1.
 
You never know what it will do till you try it. For example: My car has a 5000 stall and leaves much harder with the Air-gap intake on (as opposed to the Victor that is on it now). My car runs about the same number (6.8's in the 1/8, or high 10's in the 1/4) with either intake, Victor makes a little more MPH. The story would probably be different if I had a bigger cam in my motor, but I get by with my small roller (248/254 duration @ 0.05).



moparlover said:
.............

your best bet would be look around on here and moparts for someone getting rid of a good small block, upgrading their car to a big block. in other words, if they already have a running small block 360 that they invested in, had all the machine work done, and have aluminum heads on it you can get a heck of a deal if they are upgrading to a big block ...............
Click to expand...

… And since when is adding 140 pounds to the front end of your car considered an upgrade. :D:D:D
 
Put the air gap on and went to the track here are the time slips, airgap seams to a really nice piece I am happy with it had traction issues and my rev limiter were having me trouble so none of these were clean passes
 

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Gonna add some drag shocks and a 1 inch spacer ,and head back in a few weeks
Had no weight transfer what so ever ,car seams to be running very strong with the intake
 
Picked up mph with the same et. Looks like some improvement to me. Keep messing around with it and let us know how it works out.
 
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