I was just curious what people's opinion would be if I was to remove all the material between the two runners. Just take it all the way back to where the runners curve down. I'm just not sure if it would be worth the time to do, I mean ,the runners themselves would still be the same size at the bend. That, or just cut the runners, remove everything, and weld it back together.I've posted a pic of that idea idea, it's not my setup it another users (turbotater). I now others have done it though. Hopefuly he won't be upset that I used his pic. I'm just trying to think of a way to get a little more air into this thing, I think I may need it. Would it be better just to siamese the baseplate, although I'm not brave enough to cut on my new intake, the runners were a little less expensive. As always, thanks guys

 

Hmmmm I saw PHR do a hack job on the upper intake on a bullit stang and did gain some power. i kinda think the slp`s oughta work really good as it is. i`m currently swappin my tbi out for the tpi i gotta get the slp`s. i think the slp runners on a 305 is good for 30-35 hp more.

 

I'm sure they'd work fine as is on say a 305 or near stock 350. I've got a little more than bolt on's and few more cubes to feed though. I've already siamesed them back a little futher, but I'm still afraid it may run out of breath.

 

your not gunna get near 30hp gain with slp runners on a stock or near stock 305. Runners are only needed if you have a decent cam, and or heads in there. You will almost notice a loss in power. TPI was designed for 305's and hold up very well to bolt on 305, thought porting out the plenum and lower base is a very good idea.

 

Exactly!
prophecy xi, see this link,
http://www.slponline.com/view_produc...RTNUMBER=20002
Even SLP only claims like 20 gain on most likely a 350,
While the runners alone may actually increase PEAK HP on a stock engine your car will most likely be slower because of the lower end torque loss. Many people on these boards have found this out the hard and expensive way.

ericoo1,
With an engine combo like you mentioned, I would think siamesing them further can only help and give you more flow.

 

In a gm high tech mag they put them on a stock 305 and pick up like 10hp and tq at the wheels so i dont think it would slow anything down.

It wont make as much power as it would if you put it on a 350 but you can easly move that to a 350 later if you want too.

 

I would like to see that gm mag review. But as stated before... it will make maybe more peak hp... but total area under the curve your gunna lose. Its just not worth the $300 on a stock or near stock 305, especialy if you have a peanut cam...

 

ttt

 

Ive got that article, its on their Blue Thunder 305 Formula. They have headers, and some others things on their, just minor bolt ons, they put the slp runners and gained 10.3 RHWP and 8.9 LB-FT. Then they put on under drive pullies and gained 19.4 RWHP and think 13.7 LB-FT. They also put the SLP 3rd Gen Hawk rims and eibach drop springs, its a good lookin car!

 

does any one have any sort of dyno #'s with this mod? Not to sound rude, but this talk about the SLP's on a 305 helps me in no way. That doesn't mean that it's not appreciated, but 85TPI400 is the only one who has given any input to the original question. I hope I'm not comming off as an ***, it's just that I was really looking for some help here.

 

ericoo1,
If you already have all the components listed in that 383 build up, especially the Vortec heads, I would think that siamesing them further is about the best you can really do at this point increase flow, unless you wanted to upgrade to a Superram plenum and runner kit to bolt on your vortec baseplate.
That motor should have more than enough low end torque to not have to worry about a losing a little, after the runner work is complete..
If I didnt upgrade to a superram, I was going to siamese my slps as far down as I could from the top, port the lower section, match it to my base and give that a shot.

 

yeah all componets are in the garage, I just finished buying the cooling system this afternoon. I was guessing that doing so would lose about 10 rwtq, does that sound about right? I just don't want to ruin a set of brand new runners.

 

I was editing my above post as you responded, so read it again!
In my mind, there is no way to ruin the slp runners as they come from them.
You most likely know this but first you need to do is clean the castings up a little and smooth them out inside. Then siamese your upper plenum to match the runners and then cut the gaskets they give you to match the runner divider. As for siamesing them further, like I mentioned above, If you try what I was going to do and just go as far as you can from the top end to start with and not butcher anything, what can go wrong....

 

I've already taken the dremel and tons of sandpaper to them. I've done everything I can really, everything you've mentioned anyhow. It's just that I was looking at them and started to feel that it was all for nothing, the bends are still the same size as when I started. Maybe I'll just throw the on as is, get it all running, then buy a superram.

 

That seems like the perfect solution, because the truck will feel extremely fast with that engine combo as is, but we all know after driving it for a while we always want more, when that time comes the superram would be a very good, noticeable upgrade.
I have had a few different configurations of parts in or on my 400 and I just recently put in a bigger cam, the Superram plenum/runner kit, and a few other little goodies. I am pretty sure it will still pass the strict CA emissions when it comes time but there is not much more I can do and stay legal. All I can really look forward to now to make a drastic improvement is add a supercharger or nitrous.


Good luck with your project,
Tony

 

oh it's already going to get a bottle, believe me

 

I know "Turbotater" and his runners are pretty cool. I've been wanting to do a set for a while now, I'll post results if I do! I think they work rather well on his car with the hotcam, vortec heads, and other stuff I think he went a 13 flat or something.

 

i am gonna get some aluminum heads not sure yet but i`m thinkin of vortech, yea i dont think i can get 30 hp off them runners the site only said upto 40 hp on a 350 nothin about 305. just guessin, next winter i`m gonna get a mas performance 385 hp 408 ftlb crate 350 an swap that crappy carb for a stealth ram.

 

up to 20 on a 350, not up to 40.

 

Do a search on this board for posts by myself or Jerrywho and you'll find lots of info and pics about the SLP siamesed runners he created and put on his engine. He just went 11.61 @ 115 MPH on a stock internal engine and 200+ shot of nitrous. Now the runners will go on my car for testing.