[ratmtr]

Hey Guys,
I'm just looking for some real world experience in choosing the best intake for my new combo. I plan on purchasing a ported intake and as usual would prefer to make the best choice the first time around.
This car is a street/strip deal that obviously doesnt see alot of street duty but will drink 93 octane and see the track as often as time and money allows.
The rearend is currently a 12bolt with 411s and a turbo 400 would like to switch to 373 if it doesnt kill my ET too much. Will also be purchasing a custom converter from ATI and currently in the build stage with the rollbar and mini tubs ect.
Car weighs approx 3500lbs
.060 289 two bolt block
Scat 4340 4.25
Scat H-beam with ARP 2000 bolts
SRP 18cc
UD Harold SR 257/263 .725 .725
AFR 290's
Pro Systems 1040 (4150)
Any opinions on this is appreciated compression will be 10.8 or so and rotating assembly is currently at Lewis Racing getting balanced.
As usual cant say enough good about Mikes honesty and willingness to answer questions...Thanks Mike:thumbsup:

 

[pastry_chef]

no real world experience with that combo yet..but almost exactly what I am planning.

IMO.. AFR 290 with 496 Cubes = Victor JR preferred without question, and you should get it ported to match the heads.

 

[Bob West]

I run an RPM, not even an Air Gap, tried the Vic Jr, gained nothing. I'd run what ya got

 

[pastry_chef]

I run an RPM, not even an Air Gap, tried the Vic Jr, gained nothing. I'd run what ya got

Bob is your RPM intake stock oval port?

 

[Stokerboats]

This is a Dart that has been modified. It fits the 502 Roval exactly. I have been using with good success this Dart intake on Edelbrock TBI heads which were basically modified and ported long brfore the AFR pieces cam along. It does appear that the port entrance (shape) is very close to that of the GM Intake Gasket for the 502 502. Regardless the modified Dart Single plane has taken my 3860 lb car to 6.67 in the 1/8th at 103+ on 91 octane. oint is that matching the correct manifold to theAFR290 would be a good idea

 

[70 SS 454]

FWIW

mine is stock out of the box air gap RPM

 

[69-CHVL]

Best "real world" info I can give is that changing from a Vic Jr to a Air Gap lost me apprx 3mph in the 1/8 and 1/4, and this was a 4000lbs car, trap rpm of apprx 5700. Now, it was apprx 50* hotter that day!!!

The Air Gap felt noticeibly crispier around town, and I'm talking about 2500 rpm and below (down to 1500 rpms). After about 2500, both intakes felt the same driving, you wouldnt know which one was on the engine. Being that you have a large cam, likely higher stall, and 4.11's, I dont think you'll be below 2000 rpms much!

I say Vic Jr.

 

[blasttime]

Picked up 0.2 et going from Gm duel plane that was used on 502/440hp crate motor. Now my 509 is still in machine shop I will be using Vic Jr port matched to heads. Will also be using GM intake gaskets. My compression will be slightly higher at 10.96 with 3 degrees more intake duration. My converter flashed to 4700 behind 502 that went 10.5 @ 127 The way I see it the increased velocity of the 290s and over all flow increase, beg for the Vic Jr. I had last minute decision Friday about using Wysco 4500H rings that came with my pistons and now waiting on Total seal gapless race set. I believe my goal of running 9.90s will be reached then some my car will hook on dirt.

 

[blasttime]

What was I typing there will not be gapless rings should have had my coffee before coming here

 

[Chris Stanwyck]

Both are good. With allot of street use the air gap would be better for sure. The jury is out on track use......if you dead hook the air gap may be the way to go....better 60'.

Maybe just flip a coin.

 

[ratmtr]

Thanks for the opinions guys. I've been noticing on most dyno sheets that the RPM definately has the torque advantage while the Jr may be worth some on top im not sure its worth the loss down in the midrange. But then again my car is lighter and maybe i dont need the added traction issues? Will be running Caltract set up with a 10" tires and a 8 or 9" converter. Maybe Mark will be posting his Part II dyno results before i write out another check

 

[69 Ratt Vette]

If you are serious about getting the most out of the car you should try both. Your combination seems to be right on the border, but one might be worth a tenth or two over the other.

 

[crazydavey]

Billy FWIW I run a Jr that is just port matched to my 305's. The motor starts making 600 ft. lbs at 3000 and peaks at 4700 so lowend is not much of an issue. That's a big cam so I think I would target at least 65-7000 to make it work...JMO....

 

[Bob West]

Bob is your RPM intake stock oval port?

Mine has been ported slightly, there is epoxy in the roof of a couple runners near the opening into the head.

 

[crazydavey]

ah ha........epoxy in the runners...now we know......

 

[estherkilledfred]

Tony @ AFR recommended the Vic Jr with the AFR 290 heads.

And suggests even further custom porting to the Vic Jr!

Stated 290s give up a lot when used with a dual plane.


Do a search on a thread for AFR 290 heads for those posts. :beers:

 

[ratmtr]

So is it simply a matter of porting the new intake a inch in to match the roval entry? Sounds simple enough although ive never ported anything myself...anybody have any suggestions on what to use for stone grit and rpms to prevent me from screwing this up?

 

[ratmtr]

Tony @ AFR recommended the Vic Jr with the AFR 290 heads.

And suggests even further custom porting to the Vic Jr!

Stated 290s give up a lot when used with a dual plane.


Do a search on a thread for AFR 290 heads for those posts. :beers:

Yes i did read that statement but when i looked at the torque numbers on MJ's 290/496 i started second guessing things. Thats 540 territory!
I know dyno variances and engine building secrets aside theres something more to the dualplane at the track compared to the dyno. I know that topic has been debated alot here and am not trying to create another epic battle of opinions on this

 

[Tom Mobley]

Billy, generally use carbide burrs on aluminum. stones will load up in a hurry. use sander rolls to finish up.

If you're not used to this, be careful. carbide burr at 10k or 20k RPM will move out a lot of aluminum in a hurry.

 

[ratmtr]

Billy, generally use carbide burrs on aluminum. stones will load up in a hurry. use sander rolls to finish up.

If you're not used to this, be careful. carbide burr at 10k or 20k RPM will move out a lot of aluminum in a hurry.

Will do and thanks for the informative answer:beers:
Think ill practice on a old beat up SB performer i have just to be safe.