Originally Posted by SB (Post 4851442)

As an fyi: Edelbrock got bought out not too long ao. Same company that bought out CompCams. There's some useless facts for the day. :)
Actually maybe not that useless, as I don't think Edelbrock does all, or much, of their own castings in house now because of this.

Originally Posted by Rookie (Post 4851866)

Hmmm, Just uploaded...
h

Originally Posted by SB (Post 4851876)

Okay, checked the source (Edelbrock ) and this is the deal. Sorry for my confusion. Doh !

https://www.motortrend.com/news/edel...ssissippi/amp/

Lots of moving around and companies being bought.

“After 83 years in Southern California, Edelbrock Performance begins a new era in 2021. The historic aftermarket performance parts manufacturer is moving its headquarters from Torrance, California, to Olive Branch, Mississippi, just south of Memphis, Tennessee. One year ago, Edelbrock and its Russell Performance division joined forces with the COMP Performance Group, which is based in Memphis. In addition to Comp Cams and Edelbrock, the group includes TCI Automotive, FAST Fuel Air Spark Technology, Racing Head Service, ZEX, Inglese Induction Systems, Powerhouse Products, COMP Vthunder, and COMP GoParts.

As the Edelbrock administrative offices relocate to a 300,000-square-foot facility, most of the manufacturing processes will transfer to San Jacinto, California, the site of Edelbrock's aluminum foundry. A new Edelbrock Southern California Tech Center is scheduled to open in Cerritos, California, at the end of March.”

Originally Posted by SB (Post 4851871)

well, thank you. :thumbs Great vid. And yes, vid was just posted.
I Must have heard improper info about the foundry.

Psst: vid showed a bunch of xf efi manifolds in a pike, hopefully for people looking for one in this thread get one soon.

Originally Posted by articfriends (Post 4851849)

Heres some info:
A 525 uses the same EXACT injectors as a mefi1 454/502. I have found a 55lb import injector that I sell as match flowed sets, its slightly shorter so I machine bottom spacers to ensure it is in rail enough BUT your stock honda/keihan factory ev-1 connector injectors IF they flow fine will be just fine, I wouldn't change them unless when cleaned and flow tested they are terrible. I flow and clean alot of early 454/502 injectors and 525 injectors at my shop and for most part they clean up and flow fine.
Injector SIZE : your stock injectors are 48 lb, 48 x 8 is 384 lbs per hr at 3 bar (43.5 psi). 384 x 2 =768 , if your bsfc was .500 that means they would support 768 hp, assuming your bsfc is closer to .58 which is typical of mpi engines I tune and dyno you can deduct 16% from the 768 which would still get you to 645 hp maxed out. Even at 80% of that, it will get you over 500.
Stock fuel pump: stock fuel pump is 190 lph, its done at about 560 to 580 ft lbs tq/hp before injectors are.
Upgrade fuel pump/efi regulator /fuel cooler lines: IF your going to aim for more hp than stock fuel pump can supply and you upgrade it, you can got from 3 bar/43.5 psi to 4 bar/58 psi.
58 psi will increase the flow of your injectors by 15%, that 15% will take your max hp easily to 600 hp at 80% duty ccyle/.58 bsfc. I have pushed stock injectors close to 100% duty cycle over 675 hp with no issues.
Wideband/02 sensors somewhere in your current exhaust: If you do ANY mods, regardless of intake, etc, a wide band 02 sensor somewhere in your exhaust that you make tuning decisions from will keep you from running pig rich somewhere OR making pretty little piston ashtray gifts for your smoking friends!
Mpi Intake: I have made well over 600 hp/600 ft lbs of tq with mercruiser black intake by cutting down runners even with plenum floor/boring out TB and making 67 mm blades vs stock 60.
Flame arrestor: The flat plate gen 6 FA is a restrictive hp killer on modded engines
the Gen 5 mefi 1 factory fa is BEST flowing factory piece, those aluminum necked down adapters with clamp on KN fa's from various suppliers flow WORSE than stock and kill massive hp on modded engines
In recent testing I found the Gaffrig oval FA is by far the very best
Throttle linkage on edelbrock proflow (assuming you could actually get one), You put a throttle post thru side of their curved lever and make a bracket to bolt on side of intake, Ill post up a pic if I can find one.
Your boat in picture: Since its a single and doesnt appear to have sufficient room to put a large enough FA on the proflow, I wouldn't even consider it. A 90 KILLS a bunch of the hp gain that its known for. A proflow will embarrass a vic jr with a modded tb and good air flow but most that gain will evaporate if you clamp any 90 onto it. A merc mpi long runner intake will beat both a vic jr and proflow in early tq due to runner length at expense of top end hp but singles unless they are really a fast, stepped hull need square tq/hp. Guys get caught up on peak hp numbers that come from big cams, short runner intakes that sacrifice torque. Then boat sucks to drive, wont pull no prop. wont get on plane loaded down etc. If I think of anything else to ad I will, Smitty

Originally Posted by Joeyboost (Post 4851937)

OK that is the most in-depth write up hitting every question I could have SO THANK YOU!!!!!!
1. Injectors, can I send my stock injectors to you to be flowed and confirm they are up to the task, again im shooting for 550Hp anything more is just a bonus
2. TB, do you modify them to the larger 67mm butterfly's?
3. The cool fuel, setup what do you suggest I swap it out too and I was planning to go return style when I install a new aftermarket regulator like a magnafuel
4. do you have a Part# for the Gaffrig oval FA?
5. I want to run Holley HP on the boat and will be installing a Wideband, do I leave it in consistently on closed loop or tune then run open loop?
6. O2 location, I am debating to go dry tip or not because I kind of do not want to loose my silent choice exhaust as the lake im on break balls for noise, if I keep the full wet exhaust whats your recommendation for O2 placement? Also run two I assume?
7. What is your opinion on keeping the stock cast irion rectangle port heads over going to an aluminum? I am not closed loop cooling but am in fresh water.

https://www.ebay.com/itm/12367585652...3ABFBMloPAppNh

https://www.ebay.com/itm/14315951777...3ABFBMloPAppNh

Anyone see these intakes on ebay?

Again thank you again Smitty for the detailed writeup!!!!

Originally Posted by articfriends (Post 4851979)

Its a beautiful, high flowing piece but you will also need to buy (4) 35$ studs from them or find some gen V FA/tb studs as its impossible to mount correctly without them.

Originally Posted by articfriends (Post 4851979)

Those are 500/525 castings, with less plenum volume they offer no real power advantage over a 502 mag intake with simple mods and bored out TB other than possibly a peak hp rpm gain from slightly shorter runner, the fact you would have to come up with rails, throttle body and the rest of the missing pieces, I wouldn't waste my money.
You can PM me on the modded tb and injector stuff, I don't want to get banned for skirting the forum rules which I may already be doing even mentioning the work I do although I am at least a paying member.
as far as the fuel system, all of the merc stuff is strange inverted flair, to upgrade it you need to change EVERYTHING except stock water separator filter housing.
You would buy a holley 750 efi pump or a a-a1000, put it on a relay triggered by the original efi relay as it was never intended to supply uch more than a stock 6, 7 amp pump. You would tap rail where stock fitting goes in, buy a efi regulator, a auxiliary fuel cooler , a 10 micron filter after everything and then -8 and -6 hoses, hose ends, adapters etc. However, IF your hp goal is 550, as long as your stock stuff is in good working order, it will be fine and save you quite alot of money.
Flame arrestor: https://gaffrigperformance.com/102-EFI-Flame-Arrestors
Its a beautiful, high flowing piece but you will also need to buy (4) 35$ studs from them or find some gen V FA/tb studs as its impossible to mount correctly without them.
O2 bung: if using stock cast manifolds, you can buy or make a 02 plate to sandwich in riser but it is very hard and cobbled looking to move riser up 1" and still have silent choice connected to it.
A nice alternative I just did on a stock riser in my machine shop was install THIS piece: https://howellefi.com/product/adapto...or-marine-use/
You could run (1) o2 on the 2/4/6/8 side and be fine, IF you buy a holley terminator, it will only run one anyways.
02 longevity: That bung in a riser along with a innovate 3729 to help keep moisture off 02 sensor would make it work the best but I would prob STILL get it dialed in then remove and plug it.
https://www.amazon.com/Innovate-Moto...56991661&psc=1

Good aluminum heads along with intake/tb mods and cam will get most 502s to the 600 to 620 hp range from the 550/560 range with ok cam and iron heads, the heads are typically worth 50 to 60 hp as long as you take advantage of the extra flow with right size cam and usually aftermarket exhaust, Smitty

Originally Posted by SB (Post 4851981)

Be careful: mcmaster carrs shipping $ was great for long time. Now it super sucks.

Originally Posted by Joeyboost (Post 4852004)

Really I got stuff the following day from them. That sucks!

Originally Posted by DrFeelgood (Post 4851980)

When I put the Gen V flame arrestors on my Gen VI 502 MPIs, I bought threaded rod from McMaster and cut a couple inches off. I think the final length was about 8 inches each. 316 Stainless for $4 each.

https://www.mcmaster.com/90575A276/

Originally Posted by articfriends (Post 4851100)

The proflow front mounted tb intake with some tb work is a great piece itself, it will make outstanding hp and slightly better tq than any open plenum intake on a typical 502 build with marine cam. The software sucks, I would buy just the intake and use holley.
a couple things to note though: , no one has had these intakes in stock for sale for well over a year so that's a consideration, that delivery date of may 2023 has been moving since 2021.
Flame arrestor /entry of throttle body: to get most out of that intake, a very good cone filter with a entry taper device is very crucial. The last engine I dynoed and tuned with one, I tested countless cone filters, volutes, etc. a brief synopsis is this: 515 (4.530 bore 502) was making around 650 hp with the proflow, that hat hp dropped to the 620 range with most clamp on cone filters. It went to the 680 hp range with a volute clamped on TB and barely had a hp drop with a 10" cone clamped to that volute. Its very difficult to get a thermostat housing under it, it can be done by clearencing the bottom of TB itself. Forward clearance in your boat is a consideration too, IF you have to put a 90 on the tb, you'll kill the power and it will never make its full potential so you'd really need 11 or 12 " in front of tb to use a non restrictive filter, Smitty

Originally Posted by Nosfool (Post 4852651)

I was wonting to see where i could source the volute used on the throttle body or do ypu offer them for sale and a picture of them? i am in the process of building 540 and with pro flo xt intake that has 92mm throttle body using holley hp efi.

Originally Posted by articfriends (Post 4852009)

Ive done that with the gen V FAs too, I HIGHLY advise against doing it with the Gaffrig though, as in I dont see it being possible since I tried several ways and had problems. Because the gaffrig is not as ridgid as a Gen V and the threaded rods have to hold tb in place AND hold Fa on, what happens is it squeezes the Mesh on FA enough to jam into the throttle arm once you actually have it tight enough. The factory gen V studs (which is exactly what gaffrig is selling for 35$ each) have a locating shoulder that goes into the Gen % TB, on a gen 6 TB, it has to have the 4 holes spot faced in a mill for the countersunk tb fasteners (no big deal). So in the course of trying to run one with threaded rod on dyno, I almost had catastrophic destruction of a customers engine. The gaffrig also uses 4 little 1/4 28 button head bolts to hold the assembly together, when I did get the threaded rod to actually hold it and throttle to clear, the tension caused the bolts to come loose from the spacers and it sucked a spacer into the throttle blades. This happened at end of a dyno pull, luckily it was just a brief scare when thottle hung when letting off and it DIDNT get sucked into engine and into a valve, I highly advise people to stud those spacers with red loctite and put ;locknuts on OUTSIDE of FA or at least red loctite the screws gaffrig has in there, Smitty

Originally Posted by xlint89 (Post 4852667)

Sorry for the hijack OP, but this seemed like a good time to ask about this.

When installing the Gen V FA on the Gen VI engine, is there any advantage to using the Gen V TB with the air horn that the Gen VI does not have? Thank you

https://cimg0.ibsrv.net/gimg/www.off...730d6a5c24.jpg

Originally Posted by Nosfool (Post 4852651)

I was wonting to see where i could source the volute used on the throttle body or do ypu offer them for sale and a picture of them? i am in the process of building 540 and with pro flo xt intake that has 92mm throttle body using holley hp efi.

Originally Posted by SB (Post 4852855)

Maybe something good in near future ? Skimming the GMPP catalog and reading about the COPO 572, it shows/refers to it’s intake as a Holley HiRam.
#1: No listing that i can find for it yet in that catalog nor Holley’s. Anyone find one ?
#2 : The Copo 572 is a tall deck motor, therefore it’s intake will be for a tall deck. Maybe they’ll make on in near future for standard deck ? Who knows,
but it’s something to kerp sn eye out for.


https://cimg3.ibsrv.net/gimg/www.off...c470f74e6a.png
https://cimg4.ibsrv.net/gimg/www.off...d99ae56d2d.png

Originally Posted by SB (Post 4852855)

Skimming the GMPP catalog and reading about the COPO 572, it shows/refers to it’s intake as a Holley HiRam.

Originally Posted by Rookie (Post 4852858)

I read in another article that GM had to design a custom intake to accept the Holley LS7 HI-RAM upper lid. The base intake manifold is GM and the upper is Holley. I've been searching for that lower for a year.

Originally Posted by SB (Post 4852857)

Yup. ^^^
In my head for many years with the Dart Tunnel Ram making so much power on so many different cid bbc’s, would be great if someone could make a frt mount tbody top for it.

Originally Posted by SB (Post 4852859)

You could 3d print a top for the Dart tunnel ram ? :) :wink :cough :wink

Originally Posted by SB (Post 4852859)

You could 3d print a top for the Dart tunnel ram ? :) :wink :cough :wink

Originally Posted by Joeyboost (Post 4852944)

Do they offer a lid for a tunnel ram to accept a single Holley Sniper setup?

Originally Posted by SB (Post 4852946)

Yes, several tunnel rams have a 1 x 4bbl top available, but fuel distribution is horrible. Air and fuel have to take a few hard 90’s. No good reason to run a tunnel ram this way.

Originally Posted by Joeyboost (Post 4852962)

Get a single quad plate, mount a throttle body to it with rails and Holley HP and call it a day. Where in the power band does that intake like to shine though? Is it an off the hit to say 6,500 or does it not come alive until 3,500 rpms?