tihs is a gm dual plane off of a 420 hp ls6 motor. bronze water passage. i am going with a holley 800 and that is a 2 inch spacer to go to holley from a spread bore. the motor is 540 9.8 block , 731 cam , canfield 310 heads. alot of work and i hope it pays off. not looking for more than 5500 rpm.

eric

Alright, I am going to search ebay for 2 single plane manifolds. I already have 2 dual plane that are more an eyesore than nonfunctional. I am going to run them back to back and post results. (Weiand Stealths vs. single plane Victor jr., X-celerator, or Torquer) I believe that a Dart or Brodix will push the power well out of the RPM range I am going to be using 5200-5400. I know that a Brodix works great a 6400 RPM's.

My boat has no problem with bottem end torque and pulls great till 4900. The last 300 RPM's is what I am looking for. It will only cost me a couple gaskets and some time to lay this question to rest for me.

Dyno, I'm trying to post a pic but like all other first time things I'm having a little trouble. If I don't get it posted by the time I get my boat out, here is a description. It is an '86 Scarab Panther all white with the red accent stripes.

I forgot, the heads that i'm using have 1.88/2.25 valves in them. Would that make a significant difference? I am cautious of revving too high. I want reliablility. I have also heard good things about the old GM dual plane (LS6).

I ran the Victor Jr. and had no problems.........

Ok. I have seen a couple of Victors. One the Victor Jr. I also saw one called the "2R" or Tarantula? I think that one is no longer made...

If dual plane is the hot set up, why do the 500hp's have a single on them.

Just stirring the pot :p

My engines have about the same set up as yours. I have Merlins on them. I couldn't be happier with the way they run.

Cuda,

What intakes do you run? What kind of hp would you guess?

I run the same intake as Open72 on my 515cu.in 9.5 to 1's with 850 holleys and they are just shy of 550h.p. i run the 741 cam it will Idle all day long. I don't run the motors over 5000 RPM.

Mark

Merlin single plane. The engines were originally 454/420's. They have been punched to 468, 10 to 1 compression and a bigger cam. I would guess 450 to 475 horses a side. Starts on first touch of the starter, idles great.

Thanks guys.