Porting vs. New "Hi-Flow"
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From: RVA
Car: 89RS,89TBI FB, 91Z28, 89TPI FORMULA
Engine: 357 SBC TPI
Transmission: World Class T-5 (for now)
Axle/Gears: Strange 12-bolt 3.73
Porting vs. New "Hi-Flow"
I ran across the Skulte website page that says they do plenum/runner/baseplate/gasket port matching. After reading the reviews, he seems to be a well like and quality vendor. SO, what would be the difference (other than the huge cost savings) of having all that part matching and buying a new, say, Edelbrock hi flow baseplate/runner combo?
Either answer would be mated to a 52mm TB and air box mod...until someone tells me it's probably not a good idea.
Eric
Either answer would be mated to a 52mm TB and air box mod...until someone tells me it's probably not a good idea.
Eric
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From: RVA
Car: 89RS,89TBI FB, 91Z28, 89TPI FORMULA
Engine: 357 SBC TPI
Transmission: World Class T-5 (for now)
Axle/Gears: Strange 12-bolt 3.73
Mr Skulte said he is mostly out of the porting business, but he said he would still do it. So I'm still out to lunch as to wether my 360hp engine would be better off with porting all the TPI stuff or just buying new hi-flow stuff. I'm sure I'm gonna have to have the plenum ported regardless to remove those obstructions up front. Are the HP/TQ gains the same?
Airick
Airick
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From: Kars, Ontario, Canada
Car: '87 FIREGOOSE!!!!
Some say there isn't alot of meat for porting the stock parts, usually aftermarket is the same size as stock ported, plus there's lots of material there to port if one wishes. Arizona Speed & Marine used to (and still do I think) use stock bases ported like crazy. Usually Extrude honed. I think the main company doing this is in California. Very pricey procedure. But AS&M usually made (make) crazy power with these. So it kind of comes down to what you want. Price, and if you want to port aftermarket later down the road (that being extuded, I would think this is the only way to compare to the aftermarket pieces)
As for runners, you have to go aftermarket. Doing one, and not the others, kind of defeats the purpose. You want, and are after flow. Don't have a weak link.
As for runners, you have to go aftermarket. Doing one, and not the others, kind of defeats the purpose. You want, and are after flow. Don't have a weak link.
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From: RVA
Car: 89RS,89TBI FB, 91Z28, 89TPI FORMULA
Engine: 357 SBC TPI
Transmission: World Class T-5 (for now)
Axle/Gears: Strange 12-bolt 3.73
NO, I really have no intention of doing any "ram"-ing to this setup. The undersized fuel pump, undersized fuel injectors and stock intake are, I think, my biggest and only real issues I want to solve. The engine runs fairly well as it is, but I'm mostly looking just to get the most out of what I have. It's rated at 350hp out of the crate, the 360 number was me tacking on what I think the mods will do for it.
I have decided that I'm going to port-match the plenum/runners, runners/manifold myself. I think the cost-per-fun factor would be better doing it myself and not buying a new "hi-flo" setup. And I base that largly on the post that said "hi-flo" is mot much different that ported stock.
I still welcome any opinions on this as I don't claim to know better than the rest of you. BTW, what's an LTR intake?
Thanks.....
Eric
I have decided that I'm going to port-match the plenum/runners, runners/manifold myself. I think the cost-per-fun factor would be better doing it myself and not buying a new "hi-flo" setup. And I base that largly on the post that said "hi-flo" is mot much different that ported stock.
I still welcome any opinions on this as I don't claim to know better than the rest of you. BTW, what's an LTR intake?
Thanks.....
Eric
Last edited by BOSS 357; Sep 23, 2005 at 12:53 PM.
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From: Ontario, Canada
Car: 1989 IROC-Z
Engine: 5.7L EFI LTR setup
Transmission: T-5 World Class
LTR = Long tube runner
I have the Edlebrock Hi-flo TPI setup . I don't see you opening up the stock intake like the Hi flo unit. Check my www. I got a couple pics of how I siamesed in about 4" of the runner to change the length . Can't do that with stock runners.
I have the Edlebrock Hi-flo TPI setup . I don't see you opening up the stock intake like the Hi flo unit. Check my www. I got a couple pics of how I siamesed in about 4" of the runner to change the length . Can't do that with stock runners.
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From: Schererville , IN
Car: 91 GTA, 91 Formula, 89 TTA
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Axle/Gears: Always the good ones
IF u are truly on a short budget, the stocker does offer some impressive flow gains for only some time and effort.
A lot of metal can be taken out of it and there is enough there to make a decent improvement
Try doing a search under a post I made concerning my prototype TPI intake.
I took multiple pictures of it and compared it to my stock ported base that I spent a lot of time on.
I wont argue an aftermarket will give u more room to work with, but I wont say u cant make some serious improvement to a stocker if thats all u will have for the short term.
later
Jeremy
A lot of metal can be taken out of it and there is enough there to make a decent improvement
Try doing a search under a post I made concerning my prototype TPI intake.
I took multiple pictures of it and compared it to my stock ported base that I spent a lot of time on.
I wont argue an aftermarket will give u more room to work with, but I wont say u cant make some serious improvement to a stocker if thats all u will have for the short term.
later
Jeremy
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From: RVA
Car: 89RS,89TBI FB, 91Z28, 89TPI FORMULA
Engine: 357 SBC TPI
Transmission: World Class T-5 (for now)
Axle/Gears: Strange 12-bolt 3.73
D's89IROCZ..I think documenting your project car (as I did mine) is really cool. Looks like you know what you're saying so lemme ask you this: I'm not really on any kind of budget, but I don't mind doing as much work as i need to in order to accomplish something; how much off the Edelbrock setup (which was what I was gonna go with) would porting the stock stuff really be? My plan was to open the airbox up more to get more air in and I figured porting the stocker would efficiently make use of that air. You think the Edelbrock setup would be the better choice? (is this like asking the Chevy Salesman if he drives a Chevy? haha) Also, any thought on opening the airbox would be appreciated too. I was gonna cut out most of the front of the box (89 model) or just get a K&N cone filter and remove the box altogether.
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From: Chico/Antioch California
Car: 1989 iroc Z Hardtop
Engine: 350 tpi
Transmission: 700r4
stealthram is an aftermarket intake with shorter runners similar kind of to the LT1 intake. Would cost about as much as the hi flo edelbrock system make a little less torque and much more top end.
Its just an alternative. You should look into before you make your decision i dont have all the information just do a quick
Its just an alternative. You should look into before you make your decision i dont have all the information just do a quick
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From: RVA
Car: 89RS,89TBI FB, 91Z28, 89TPI FORMULA
Engine: 357 SBC TPI
Transmission: World Class T-5 (for now)
Axle/Gears: Strange 12-bolt 3.73
I have looked into that. I'm not being closed-mined, I just know what I want my BOSS to do. And I have discovered the benefits of that Search tool on these-here boards. Great tool, helped me a bunch. I did finally make a decision and the new Edelbrock mannny & runners are it. Still a bit undecided on the injectors tho...I'm thinking 28 or 30# w/ custom FastChip. Dunno..I'm still SEARCHING around for that info.
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From: RVA
Car: 89RS,89TBI FB, 91Z28, 89TPI FORMULA
Engine: 357 SBC TPI
Transmission: World Class T-5 (for now)
Axle/Gears: Strange 12-bolt 3.73
I don't think 24lb injectors would cut it. From the calculations I've seen, I could only get <310hp from them. My engine is rated at 350hp, and I think I'm going to get 360 when I'm done. I am going with the AFPR set at around 48-50psi. I'm not looking to max out the little 24lbers, I'm looking to make sure that down the road these injectors will handle whatever else I throw at it.
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From: Ontario, Canada
Car: 1989 IROC-Z
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BOSS355....
thanx man
I learned alot from reading threads by 3.8TransAM and other vets from here. Sucks in the begining being told to search ....but after a while you will notice why 
SO I guess I am good as what I read
. Well there are some definately stock intakes opened right up
mine looks like the runners would be a fair bit larger than stock .... due to the fact there is stuff to take away . There are a few on here who don't like the edlebrock stuff becasue of casting issue. I was lucky here and everything was good.
The runners are way overpriced IMO . BUt I think they have the greatest potential out of all of them ( just more to take out/off) . I don't like the SLP runners . I had them in front of me beside eachother ...they were a fair bit smaller I.D than the Edlebrock unit. ( i could visually see the difference). I also don't want a Stealthram just becasue of the emmisions stuff. Yeah theres a way to make them work legally . But I am not sure if you can do that up here.
also remeber SVO injectors are rated differently .... I hear tell they are more closer to 25 because they rate them at a different PSI.
thanx man
I learned alot from reading threads by 3.8TransAM and other vets from here. Sucks in the begining being told to search ....but after a while you will notice why 
SO I guess I am good as what I read
. Well there are some definately stock intakes opened right up
mine looks like the runners would be a fair bit larger than stock .... due to the fact there is stuff to take away . There are a few on here who don't like the edlebrock stuff becasue of casting issue. I was lucky here and everything was good.
The runners are way overpriced IMO . BUt I think they have the greatest potential out of all of them ( just more to take out/off) . I don't like the SLP runners . I had them in front of me beside eachother ...they were a fair bit smaller I.D than the Edlebrock unit. ( i could visually see the difference). I also don't want a Stealthram just becasue of the emmisions stuff. Yeah theres a way to make them work legally . But I am not sure if you can do that up here.also remeber SVO injectors are rated differently .... I hear tell they are more closer to 25 because they rate them at a different PSI.
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From: Schererville , IN
Car: 91 GTA, 91 Formula, 89 TTA
Engine: all 225+ RWHP
Transmission: all OD
Axle/Gears: Always the good ones
Best IC to use for SVO 24# is 23.8.
I and others have tested it on stock cars and Rich at Cruzin even flowed them at 24# at stock TPI fuel pressure 43.5
24# injectors by themselves and no prom tuning will put your ecm at the brink of being unable to compensate and you will always be on the rich side.
An AFPR is no where near the best way to compensate for them either.
Do it in the tune
later
Jeremy
I and others have tested it on stock cars and Rich at Cruzin even flowed them at 24# at stock TPI fuel pressure 43.5
24# injectors by themselves and no prom tuning will put your ecm at the brink of being unable to compensate and you will always be on the rich side.
An AFPR is no where near the best way to compensate for them either.
Do it in the tune
later
Jeremy
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From: RVA
Car: 89RS,89TBI FB, 91Z28, 89TPI FORMULA
Engine: 357 SBC TPI
Transmission: World Class T-5 (for now)
Axle/Gears: Strange 12-bolt 3.73
I wasnt' just gonna slap some 30's on there and rev the fuel pressure out of the hood. There will be a custom FastChip to take control of everything.
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, so I'm not sure about the others. 
