D's89IROCZ

well , I will chime in You could siamese these (edlebrock) runners all the way down if you had the means too . Mine are siamesed in 4" ...like the new ASM ones I guess . The reason for the figure 8 looknig port style is "gasket matching " take a set of Mr. Gasket 146's ...check it out . I wish now I had better pictures of them . You can only make it so big before your gasket ain't doing ya no good . Mine were matched to the 146 gasket ( which is for the over sized runners ) The plenum was also matched to this . SO oooooo.... hopefully I got no blockage in the intake to impede flow. Now if you can show me how big that oval SLP openeing is .....compared to these edlebrock units I got here ...I have a fealing mine would have a bit more openeing . These really to seem alot more meaty than the SLP 's I seen with them .


.....Now we just gotta figure out a way to nicely siamese all the way through the runners ....and make it nice looknig
87350IROC .... don't take an of this wrong .,.....I am loveing this discussion . I am finding it eduicational Here is the Plenum being matched aswell

87350IROC

iTrader: (2)

Ok, good stuff, thanks for the info. You can cut down your gasket to a full oval if you like, and still have full sealing surface. The problem comes when you get near the little push pin things that hold the gasket to the plenum. But yea, your works look beautiful. I wouldn't go any farther, its just not necessary for all the extra work. You may very well be right about the edelbrocks being bigger. I'm sure how much meat is on the slp runners and flanges. My main point of this was to give some ideas about the shapes of the runners. Yours looks like it flows nicely. Did you notice an increase in rpm potential?

89Warbird

I've got SLP runners but after seeing some AS&M's I wish I had bought them.

I got the SLP's because I wanted the semi siamesed for better top end and I got them on a GP for $200.

D's89IROCZ

Well , I am hopeing for it to peak out at 5500rpm . I havent had the chance to even run the car yet with the new motor . Hopefully this weekend if I can find a driver ...and a truck I will have it out to Sparta Motorspeedway . To get some digits down before the snow fly's

D's89IROCZ

]DP ...sorrry

Buddy

I'm very interested to hear how it performs. The runners/base porting are the only changes you have made since last out with it? This will be a better indication of the performance increase. Did you have the Edelbrocks on your car in "base" form before? Was there any difference that way from "stock"?

D's89IROCZ

Actually this was a new engine I had built for me. I origonally had a 305 TPI ...now I got a 353TPI . I havent ran it yet . the 305 ran 15.1@93 w/2.2 60ft. I am hopeing for a 13.8 with this setup( and this cold air ) . I will let post the results ....and hopefully some datalogs and tuneing will be done with the new prominator this Saturday aswell . *** I am itching to try that sucker out.


....untill Saturday ...maybe sunday I will post it

TheMysticWizard

iTrader: (1)

Hmm so I did some research on Intake Bases today.... I know all you guys say it's the same casting, but..

If you look in the FAQ's on the main page here you will see that the Accel (super ram base) and the TPiS Big Mouth base have the same size entry and exit(1.75 round entry and 2.090x1.280 exit ports), now they don't list the Edelbrock in the FAQ's, but I searched some more.

On Edelbrock's website they recommend intake gaskets with the GM part #10159409. Port exit dimensions: 1.25" x 1.98". Looks to me that the ports are a little smaller, but I haven't found the Entry size, it may very well be the same as the other bases.

Looks to me that the Edelbrock is a little inferior, but then again I dunno if I can believe everything I read on the net. If you wonder also, ask yourself, would Edelbrock recommend using a smaller gasket than their ports on their intake? I kinda don't think they would myself, which leads me to believe that Edelbrock's exit ports are only 1.25" x 1.98".

I dunno... just the results of my half hour of research, I think I will be buying the Big Mouth anyways since I can get it new for 380 shipped. The Accel looks to be atleast 425 plus s/h (same as Accel), and the Edelbrock (possibly inferior...) is 379 plus s/h.

D's89IROCZ

Welll I didnt actually measure the base ports going into the head ..... and I didn't put it togethter ...maybe I can findout the intake gasket he used ( been a while LOL ) . BUt at any rate I got to run it yesterday .

Traction sucked bad couldnt get better than a 2.2 60ft'r. Me and my 220 lb buddy was in the car . Half tank od gas . I had on bald 15" 235 60 's and the car was running of the stock 1989 5.0l tpi 5-speed .bin file . SHe LOVES to rev but that could becasue of some of the components in the engine .,....

first run
2.56 60 ft
6.665 330 ft
10.2 1/8
74.91 1.8 mph
15.19 1/4
93.94
The clutch got smoked on the first burnout .... I think thats why that really sucked

second run
2.215 60ft
6.130 330 ft
9.396 1/8
76.40 1/8
14.499 1/4
95.49 mph


Again , this thing really felt strong and reved quickly . what I was told about the 3.73's w2ere right ...1st gear becomes kinda useless . the car was rolling to the stageing lanes ...and if ya punched it ..... she lit both tires up easilly . I fried the alternator though . the first pass I made too shifts at 6500 rpm ( it got there before looking down at the tack LOL ). So this aint bad for the stock 5.0l prom in it right ? With a passenger over 200 lbs and bald tires ?

metalhead212121

I really have a good understanding on what your guys are talking about now that Ive seen your drawings. Cant thank you enough. I think I just have one final question....

Is it safe to assume that "bigger is better" in this case? Does porting and siamiesing intake pieces "to the max" equal more power overall? Sorry if this is confusing... Im wondering if its smarter to siamiese a runner "to the max" or opt for AS&M runners and just bolt them on... OR is this just one of those "try it yourself and get back to us" answers....lol


Dan

D's89IROCZ

Actually, the reason I ported mine ..... also why most siamese theirs ...is to raise the rpm potential of the Long tube runner design. The stocker tops out at( mentioned before ) 4800 ish on a 350 ..... and seems to get even lower on the bigger cube smallblocks ( mentioned above ) .

If you go cam searching ......alot of them top out at 5500 and above ...... so people port out the intake to try and move where the TPI chokes out ....up a little . Remeber my nickname ....and check next season .....I will have the dyno results , so you can see the power curve . Also try checking out stealthram ITs a great site. He has some nice dyno results on a ported Edlebrock base and SLP runner ( siamesed ) with the ZZ4 camshaft . Its nice to see where you would be makeing your power with that setup .....and he has the dyno graph

87350IROC

iTrader: (2)

Yea for off the shelf runners you want to go big, assuming your plenum and base have been ported or replaced to match the bigger runners. The base should be the same size as the runners, same for the plenum. So port the base if it isn't already big enough. As far as siamiesing, if you get runners that can be siamiesed, i would siamiese them maybe 3-5" in. And i would make the shape close to an "oval" while still leaving enough room for gasket sealing and the plastice gasket aligner, holder, things.