HotRodV6

Im currently swapping in a 97 350 vortec into my 93 S10 with a 93 M29 T56 and going to do the multi-port setup with EBL From Dynamic EFI, down the road im going to build a stout 383 with a remote mount turbo but that may be a year or two away, I only want to buy one induction setup, and at most swap injectors for the 383 and have been looking at the Edelbrock Pro-Flow XT that uses an LS style single 90mm TB, and the HSR with a 58MM dual bore TB.

Id like some feedback to see what others think.

Orr89RocZ

iTrader: (20)

Havent seen much on the proflo xt but i'm sure it's a good intake. HSR has been proven to work well on a variety of setups so its definately a good consideration for your goals. It boils down to what TB you want to run. Either dual bore or single ls style.

Tony89GTA

iTrader: (7)

I wouldn't bother with a Pro-Flow XT, to even port it out to a 1205 gasket you would need to add material, plus the injector ports I thought were blocking the air path to much. Was very close to doing this project myself tell I got the intake in the mail, was not impressed. Intake looks nice but I would way rather go for a HSR over it.

Couple of picks for ya, blue ink is a 1205 gasket.

Orr89RocZ

iTrader: (20)

Looks like you have plenty of material for a 1205 gasket? You should see my heads for 1207 gasket...talk about little material around the intake port.

Tony89GTA

iTrader: (7)

There was no chance at that, I would be cutting through to the outside once you past the mouth unfortunately Was really surprised myself when I really looked at it, and dissapointed.

Orr89RocZ

iTrader: (20)

Wow, that thin in those areas? Doesnt seem right for a casting like this.

Tony89GTA

iTrader: (7)

Probably no more then 3/16" it's a very light casting. Don't get me wrong not all of it would need to be welded up but how thin do you want your walls and is it really worth the effort? Plus the injector ports really get in the way of air flow I thought.

some more pic's, give you a better idea

Orr89RocZ

iTrader: (20)

Wonder if you could build up spots with epoxy? Common use in alot of head ports and intakes...holds up to abuse fairly well as long as you dont run alcohol thru the motor.

RedGut86

Great pics of the XT, interesting, Edelbrock told me you could port it out to a 2.6-2.7 CSA. A 1206 will be thin up top but they made it sound like it should work. Good to know... They also told me specifically the injector ports should be cut down, not sure why the casting has them so long.

Hmmm... a big part of why I wanted to run it was that it made going single plane more viable with the same TB, if this is true though that does suck.

RedGut86

This is on the mustang piece, but it has the same injector port issue.

http://www.mustang50magazine.com/tec...s/viewall.html

Orr89RocZ

iTrader: (20)

Thats what I figured. You can grind those portions out and open up the whole cross sectional area and allow more flow to enter the head. Also even out the velocity profile and reduce any turbulent areas. Thats a nice gain.

I'd open it up. If you pop thru the walls, get some intake epoxy. A-788 "splashzone" epoxy.

RedGut86

Sweet. Is that something that can be had from Autozone, Napa etc or do I need to go to a specialty store. I'll either tackle this or save up some money and send it out to maybe Ron here on the forum for a work through.

I think if I get the car running smoothly for long enough, I'll probably take it out and clean up the ports, maybe go to a 1205 but probably not much more. I'm making similar power with a much smaller cam. I'll hope for similar results.

Heads flow 300cfm (comp AFR 195 elims). I should also note, Edelbrock said it should be good for 600hp...which requires around 300cfm. So while they wouldn't give me a flow figure... I'll hope it is or will be close to that when I'm done.

Orr89RocZ

iTrader: (20)

I dont think autostores will have it. Its not real cheap either. Marine/Boat repair type places use it but they use it in larger quantities than you'd ever need for an intake. Its like 225 for 2 gallon kits.
50-60 for a quart.

Some online places sell it in the smaller quart sizes. Reher Morrison racing engines sales quarts and pints

RedGut86

Thannks Orr. OP which way are you going to go?

Tibo

iTrader: (15)

I thought the EBL wasn't able to control the tps and iac from an ls1, only the components that ecm originally came with.

anesthes

iTrader: (12)

LSx TPS and IAC are the same as TPI, in regards to signals. I've run LSx throttle bodies on numerous builds using '730/'165 ECMs.

-- Joe

Orr89RocZ

iTrader: (20)

I have heard/read that the IAC for LS motors has different number of steps programmed into the ecm code that controls it. Think they have a wider range of operation? I havent seem to have any issues with my 730 using ls1 TB and IAC/TPS.

To add to this thread, my cam guy who does alot of EFI LT type builds recommends the Pro Flo over the HSR. Says it has a better runner port entry and its alittle shorter runner. Just needs ported to larger gasket sizes and if you break thru, weld it up or epoxy it as needed. He says none of the EFI shelf manifolds are race quality, they all need work and I agree. They will need ported to some extend, whether its mild matching or full port job to get the min cross sectional area needed. With heads in the 2.0 sq.inch CSA range like AFR 195's, most intakes dont need much work to accomodate that. However if you build a serious sbc or high rpm setup that needs 2.2+ inch sq, you need to open up the manifold a good ways

Tibo

iTrader: (15)

even though the pro flow appears to have a much smaller plenum area? I've read that the front cylinders can become starved on high HP and rpm or blown applications on the hsr. Would the smaller plenum area on the pro flow exasperate this?

Orr89RocZ

iTrader: (20)

I would have thought the smaller plenum will have worse effects. I know LT1 type intakes are more prone to issues than the larger plenum setups. My single plane has a relatively small plenum if you dont count the elbow as an extension of the plenum but the way it feeds all 8 cylinders from a center position, they all seem to get the same amount of air. Front feeds typically will have front cylinders taking in more air leaving the back ones rich. MY HSR did this but others have reported front cylinders running rich while rear is lean. So I guess it depends on the setup.
But there are guys boosting those intakes just fine. Just need to pay attention to the fuel readings on each cylinder to see if there are any distribution issues.

I'd like to do a Ford 5.0 type intake with the HSR. Box off the front TB mount and place it over the side 90 deg from front of motor. Should feed much better that way.