I was talking with some guys down at a speed shop about what we were running and i told them my set up and i got feed back that i went with the wrong intake for my set up what do you think.
intake- VICTOR JR. oval port the heads are 781 oval port heads with 1.190/1.18 valves ported and polished.carb- Holley 850 dp.the cam is a LUNATI
HYDR.CAM #0026,WITH .549/558 @ .050
WITH THE MATCHING SPRINGS. now my block is all stock 454 the C:R is stock and so is the pistons
the short block was in great shape and didn't want to fix something that was not broken.
th400 trans with a TCI break away stall
let me know what you think
OH YA ITS IN A 70 CHEVELLE , AND I DO HAVE HOOKER HEADERS WITH 3.5 COLLECTORS, HEI, 1.7ROLLER ROCKERS.

Post the proper cam spces, what are the rear end gears ? stall speed ?

After you post the above info you will probably still find out the car would be better off with a Performer RPM.

Unfortunately yes you did....A dual Plane would be the way to go..

the rear gear will be 3.73 and the stall is around 2500-3000 hope this helps

CAM INFO.
RPM RANGE 2500-6500
DURATION .....LIFT
ADV IN/EXH 293/310 DEG.
@.050 IN/EXH 232/239
@ VALVE 549/558
@ LOBE IN/EXH .323/.328

OPENS/CLOSE @.050
12DEG BTC
40 ABC
55.5 BBC
03.5 ATC

Well, your definatly giving up a bit of usable power to say an RPM/Air Gap style manifold. I wouldn't worry to much though man. If you ever decide to spray it, distribution is better with a single plane manifold at more then 100hp settings. Regardless of if that's the case or not, that intake would get along better with more cam/gear/converter then you have. For best NA performance sell that thing and buy an RPM intake.

-Joe

thats what i think i'm giong to do , its brand new i had it port matched to my heads , oh well
at lest i used it to break in my motor,maybe i'll find someone to trade off or i'll sell and get a RPM INTAKE . :eek:

Run it to get some E.T.'s first! It's already on there, go for it! This will give you some solid information to work with. At the very least it could be valuable info for someone on this board or amongst your friends in the future. Come on, try it and share the info with us. smile.gif

YA , YOU MAY HAVE A POINT . BESIDES IT LOOKS TUFF
ON MY MOTOR!!! :eek: I was also told if i ran a 4 hole spacer this might help alittle more in the low end ,??? I still :D have not set up my rearend yet .so maybe if i went with a 4.11 insted of a 3.73 this might help??

Robert, I always run Victor Jr's on all my builds, for my off-shore customers too. Contrary to popular MYTH, they give up very little down low and never run into a RPM ceiling concern. Proper tuning will get you moving.

I got an almost brand new RPM that I might be willing to trade... I have to see what my 3500 converter does when I get it swapped this weekend....

Stick with your 3.73's
Thats a good cam..that the "old" Lunati version of the 288/296 Ultradyne designed for hot marine applications..good cam

Contrary to popular MYTH, they give up very little down low and never run into a RPM ceiling concern. There are several around here that would argue about"what they give up down low" right Garret??,Ed?? ;) and most of us have a self-imposed rpm ceiling for engine longevity graemlins/thumbsup.gif

For continous RPM at say 4500 in a marine application, I would agree that there would be little difference betwen the two intakes in most cases that run under 6500 RPM max.

But for those of us that have tested the two intakes using timing devices to the .001 of a second, it is a proven fact that properly tuned the RPM will ET quicker than the Victor JR. in just about every NA Heavy Street car.

A 4-hole spacer did nothing for me this past summer with my Vic Jr....That's OK, just another test. However, it may help in a smaller cubic inch combination such as a 468 very well.

With an RPM I was able to ET a full .1 quicker in my previous combination, I gave the Vic Jr. 1 1/2 seasons to tune. With an RPM and an Open spacer (open spacer was a must) it took 3 weeks to beat the best of the Vic Jr. ET's. This was with 3.55 gears into the 11.40x's.

The best part of the swap was the street driveability improved drastically.

Do Not bandaid by putting in deeper gears, be firm with yourself and set it up the way you want it for the final product. It is a lot easier to swap an intake than go through a gear change.

Most importantly avoid the tendency of not giving your combo enough time for tuning. I can't stress this enough...most new combinations can pick up .1 to .2 in ET with just tuning without spending more than fuel and entry fees.

With an RPM I was able to ET a full .1 quicker in my previous combination, I gave the Vic Jr. 1 1/2 seasons to tune. With an RPM and an Open spacer (open spacer was a must) it took 3 weeks to beat the best of the Vic Jr. ET's. This was with 3.55 gears into the 11.40x's.
On that combination, yes, I would think the RPM would shine!

Keep in mind the 3.55 gear, which puts your average RPM range much lower.

Also, The only good testing that I have seen on this was using the Canfield 310cc runner aluminum Head (your's and Kjet).

The Victor Jr. "OVAL" matched to an Oval port head is a whole different animal....!

I too have done this swap, and a direct bolt on replacement going from RPM with 1" spacer to a Victor jr netted me 2+ MPH and over a 10th! Keep in mind that was not the same day and with no jet changes.

Both are very good manifolds, with a 3000+ stall and 373 or 410 gear, there should be no noticeable difference in street-ability.

My vote....Keep the Victor Jr. graemlins/thumbsup.gif