if your trying to save money ,you could port/polish the stock lower and open the upper to match the t/b. I've done this in the past and isnt hard to do ,also a 65mm would be better for your stock heads and intake.If you go to a after market intake then run the 70mm. others may not agree good luck
Flow rates for Stock 5.0L H.O.
Ok, so I know the stock 55mm MAF was choking down the engine since the TB was 60mm and had to breath thru that little 55mm hole. The MAF has been replaced with a C&L 73mm unit with proper sample tube for 19# injectors. Next question is, how much is the stock intake choking down the E7TE heads? I've read that they'll breath a lot better then the stock intake will allow them to, so how far can I upgrade the intake and TB before the heads become the choke point? Explorer intake, Edelbrock Performer, something else and how large of a TB can I go with before it's just wasted mm's. I'm thinking a 70mm would be about right with the proper intake or would a 65mm be all the stock E7's can handle even with an upgraded intake. Also, this engine is suppose to have a b303 installed in it(how can I verify that, can I measure the lift or something at the rocker and fine out?) so that should help breathing a bit. Anyway, what would a good set-up be to get the max. cfm out of the heads and 73mm MAF without breaking the bank? Thanks.
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So with an aftermarket intake(or I assume an Explorer or Cobra) a 70mm TB would work out well. Otherwise with the stock intake 65mm is about all it'll flow. Thanks for the info. :bigthumbsup
the e7 heads and lower intake are to two main choke points........for a budget build i would swap the e7's for gt40's explorer intake from tmoss and a 65 mm tb from him too. this will wake up a stock 5.0 quickly and cheaply of course the supporting mods to go with this will net nice gains.
the issue is with puting a cam in a stock 5.0 is the intake and heads choke off(@4500rpms) before the cams power band is full used so putting a cam in one closes the power band...imho
really cheap budget port the e7's and the stock lower 1 and 5 runners add some gears and have fun
what ever you do--- try to match all pieces together, heads cam and intake for the best performance
the issue is with puting a cam in a stock 5.0 is the intake and heads choke off(@4500rpms) before the cams power band is full used so putting a cam in one closes the power band...imho
really cheap budget port the e7's and the stock lower 1 and 5 runners add some gears and have fun
what ever you do--- try to match all pieces together, heads cam and intake for the best performance
I run an Explorer upper/lower with explorer 65mm TB and matching EGR spacer, along with Pro-m 75mm maf and explorer 19 pound injectors, which have a better spray pattern and atomization than the mustang 19 pound injectors. The air silencer was deleted by the previous owner, so I installed the K&N panel filter and of course the exhaust and headers. Runs great! :bigthumbsup
Right now, starting front to back I've got:
Spectre Cone Air Filter, 73mm C&L MAF housing, Smog Delete, EGR is unhooked, Long Tube headers running into an X pipe with turbo mufflres and from what I've been told(can't verify it) a b303 cam and 190lph fuel pump. It also has 3.73 gears. I'm thinking a good intake and TB will really wake this motor up a lot over what it is now. Especially if it does have the b cam in it. The long block is going to stay stock for now, no reason to pull perfectly good E7's off of it especially when I don't have the funds for an intake right not, let alone new heads. Just trying to plan some budget stuff to do in the future that'll be quick to install and cheap.
Spectre Cone Air Filter, 73mm C&L MAF housing, Smog Delete, EGR is unhooked, Long Tube headers running into an X pipe with turbo mufflres and from what I've been told(can't verify it) a b303 cam and 190lph fuel pump. It also has 3.73 gears. I'm thinking a good intake and TB will really wake this motor up a lot over what it is now. Especially if it does have the b cam in it. The long block is going to stay stock for now, no reason to pull perfectly good E7's off of it especially when I don't have the funds for an intake right not, let alone new heads. Just trying to plan some budget stuff to do in the future that'll be quick to install and cheap.
Just replaced my home ported stock intake with an Edelbrock Performer last week. The engine pulls noticeably harder at low rpm and it feels like I've gained at least 15rwhp higher up.
My heads are factory E7's that I've ported but kept the stock valves. I can safely say that the stock intake manifold definitely chokes them off, and the Edelbrock Performer is a brilliant upgrade.
My heads are factory E7's that I've ported but kept the stock valves. I can safely say that the stock intake manifold definitely chokes them off, and the Edelbrock Performer is a brilliant upgrade.
Those heads and intake are the restrictions, until you change them then you'll always be limited by them no matter what you do.
A pro ported HO intake will flow 200cfm. The Performer and Explorer flow 205-210cfm. There is not that much difference in flow on a bench - but that is not the whole story. The ported HO will make more average torque and power below ~ 4,200 rpm and above that the other intakes make more. Average power over an idle-6,000 rpm band will be very close, it's just a matter of where the curves hold more torque.
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