long story short....ran a bolt into my lower that had gasket material in it....it opened up a big gouge and I think my lower is ruined. I put my stock intakes back on my mild 308 and it starves for air after about 3k rpms! (gt 40 heads and edelbrock performer cam)

so I want my performer truck efi Intakes back on this motor, but I cant find just the lower anywhere! anyone got any ideas on where to find one?

 

Maybe it can be repaired at a machine shop for cheap.

 

I don't think so, if the motor doesn't make any power above 3000rpm you got other problems, because the stock 5.0 truck intake flows at least as much as that Eddy.

Your lower should be fixable by somebody with some aluminum welding skills or maybe even by just tapping the hole for a larger bolt, but if you do need a new piece the lower is sold seperately by Edelbrock and the Pro Products Typhoon is an inexpensive copy that is also sold by the piece.

 

I would agree with conanski, the stock 302 truck efi intake flows pretty damn good and it sounds like something else may be your issue. What else can you tell us about the build? are you still running speed density or did you convert to mass air?

 

stock .040 over rebuild on bottom end. summit brand cam (same as edelbrock performer) 204/214......448/.472, 1.6 rollers, cast iron gt40s (not p's), Ford racing maf conversion with stock 58mm (mustang style) maf, underdrive pulleys, headman shortys, msd blaster II coil, msd dist cap,


anyway it doesnt run bad, but I went STRAIGHT from the edlebrock intakes to the stocks because I cracked the edelbrock lower.....and It feels almost identical from idle to 3500......but you can tell its restricted above that......at least I can tell cause I know how it felt and sounded before. It sounds constipated now at high rpms lol

everything ive read stated that the stock lower flows well, but not the upper! I would like to see some flow numbers that show the stocks flow as well as the edelbrocks as i can feel a good 15-25hp difference! at least with my setup

ima take the lower to a machine shop and see if i can get it fixed....I did find out that it is sold seperately! p/n 3820.......thanks!

 

one think I have not been able to find any information on is the stock twin blade throttle body!!! Im thinking about getting my lower intake fixed, and while im in there putting it on, going ahead and swapping to 1.7 rockers. Ive got a C&L 73mm Maf that id put on when I get my bassani offroad y pipe, and MAC muffler setup dont (and then finally have a custom chip dyno/tuned for this thing).

anyway, I dont know if the stock TB flows well, or not! I dont want to spend the 360.00 on the BBK 62mm, but I guess I might have to be the guinea pig and try it since I cant find any info about the stock one....

 

why not just get a gt40 upper/lower, they are common and flow well , get the upper/lower spacer to gain a little extra runner lenght. you should probably figure on going to a 24lb injector also while your at it.

 

because ive already got the edelbrock setup, all my duct work would have to be re-configured, probably my throttle/kickdown setup, and i would guess id have to extend some of my engine harness connectors...

if i get my edelbrock lower fixed/replaced...its plug and play with the setup ive already got

 

i would be willing to bet money that the stock intakes (at least the upper) is the first line of restriction in these trucks, as ive felt a big difference in the intake swap even with the stock y pipe and exhaust...

but I cant say for sure as i did heads and cam at the same time

 

I've got a lower that's gathering dust. And an upper. And a 351w lower that the upper fits as well. PM me with an offer if you're interested.

 

The stock truck lower flows 200cfm per port untouched and close to 250cfm when the exits are opened up, all data from TMOSS. The stock truck TB is equivalent to a 75mm single which will support 400hp easy, so that isn't a bottleneck on this motor either. The only part I don't have any data on is the upper but the common trend with the stock intakes is that the lower is where the restrictions are so I don't see it being any different with this one.. especially considering the size of the ports on this version.

You're killing this motor with the stock exhaust on it, the y-pipe and cats are a hugh cork.

I have a similar engine combo in my truck, I have stock heads and intake but a bigger cam and a full exhaust system with longtubes and the motor screams to 5000rpm no problem at all, your problem is not the intake.

 

I'd take Paul's advice, he knows these SBF's inside and out and what works and what doesnt. If I'm wrong he's a helluva BS artist!

 

I completely agree about the exhaust! Time and money is what im waiting on to get mine done ...

 

I tend to believe my own eyes first and foremost. Being that I've had both the edelbrock upper and the stock upper laying side by side, you can't tell me the obviously larger runners on the edelbrock don't flow more than the obviously smaller diameter ones on the stock.

Now weather or not my setup needs the extra flow yet or will benefit from it is open for debate ....

 

I use the edelbrock truck intake on my 302 with the twin 61mm TB and a 80mm MA meter , helps alot with low end TQ and still has good rpm 5800.....Lew