I'm looking for a cheaper intake manifold and I talked to a guy that had a built 87 fox and he said the Edelbrock RPM air gap is the best intake you can buy? I was thinking about getting the performer intake just because it's a little cheaper and will allow me to look for a set of cheap aftermarket used headers... I just need to improve my airflow before I do anything serious.. I was thinking Intake manifold and headers would be a good all round start since I already have a edelbrock 4 bbl carb (500cfm i think?) and I just put on a spectre air filter today and I'm also going to buy tubing to make a kind of ram air since the tubes in the fenderwells are well.. there! What's the verdict from experienced guys? I'll probably just throw on a set of gt40 heads because i'm more worried about the stock intake manifold right now...:swordfight:
Edelbrock intake manifold(S)??
Fast85FoxGT
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I'm looking for a cheaper intake manifold and I talked to a guy that had a built 87 fox and he said the Edelbrock RPM air gap is the best intake you can buy? I was thinking about getting the performer intake just because it's a little cheaper and will allow me to look for a set of cheap aftermarket used headers... I just need to improve my airflow before I do anything serious.. I was thinking Intake manifold and headers would be a good all round start since I already have a edelbrock 4 bbl carb (500cfm i think?) and I just put on a spectre air filter today and I'm also going to buy tubing to make a kind of ram air since the tubes in the fenderwells are well.. there! What's the verdict from experienced guys? I'll probably just throw on a set of gt40 heads because i'm more worried about the stock intake manifold right now...:swordfight:
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If your only going to use gt40 heads then just get a gt40 intake. I found mine for $50.
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An RPM Performer should do good with a set of gt40's. You'll need a bigger carb, in all likely hood.
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You think he'll need a bigger carb? I thought a 500cfm was still a little big for a 302? Rule of thumb says: Cubic Inches X Max expected RPMs / 3456. For a 302 that equals 480cfm. I know it will vary depending on other parts and the purpose of the motor, but I figure for his set up 500cfm is a bit big, but will work alright. I've got a 650 DP and its a too much.
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That's kinda a fictitious formula that leans for max efficiency. In the real world, a stockish 302 will be fine with a 550-600, heads and cam bumps it up to 600- 650 range, my 650 is perfect when spinning to 6200rpm. A solid roller spinning to 7k+ could want a 750. A manual secondary carb, like a DP, will use a more conservative size, and will want some good gears. I'm a big fan of Quick Fuel carbs these days, and they will jet, or setup your carb for your needs. I've heard they're very good at it, where no further tuning should be needed.
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The RPM Air Gap is a great intake. Ran one for many years when carb'd. I noticed almost no low end loss when I upgraded to it from the factory 2 barrel but gained a lot in the top end.
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So if I went to the junkyard and asked for a set of gt40 heads, what would I need to ask for specifically. Explorer 302 gt40 heads? And I'm just going to keep with the carb I have on now until I noticed a loss IF it happens... But when I order my intake manifold(Performer most likely) I'll be buying heads at the same time..
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756 Posts
96 to 97.5 are the years you want. Check the front of the heads out, you want the 3 bar version. The GT40p heads have 4 bars cast into them and will require a special header.
Go for the Performer RPM Air Gap over the Performer intake. Well worth it.
---------- Post added at 06:35 PM ---------- Previous post was at 06:34 PM ----------
Heres a picture for reference. You can see where the bars are cast in.
Go for the Performer RPM Air Gap over the Performer intake. Well worth it.
---------- Post added at 06:35 PM ---------- Previous post was at 06:34 PM ----------
Heres a picture for reference. You can see where the bars are cast in.
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Carb and intake should kinda be matched, along with your head and cam. I have a Edelbrock 600 1406 , and it says to not use it with any Performer intake. I'm not sure exactly why that is, but I would double check what you have, and match the intake accordingly, if you aren't going to change. The stock 4 barallel intake is not a bad piece for a stockish combo.
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I stand corrected
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Well i'm not exactly sure the model of the edelbrock carb or what cfm it is.. How do I find out? And I guess i'll go to the junkyard and try to score a set of gt40 heads.. and I'll save up that extra $$$ for the rpm air gap intake.. I think I might throw on a different set of headers just because the stock cast iiron shorty headers from the factory have no air flow..
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Check your exhaust manifolds then. All 85 v8 stangs used steel tube headers.
Jerry
Jerry
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It has cast iron shorty headers, but they are pinched at the port. Another guy who has a 500rwhp fox told me it was a constricted header set.. He told me to get Air gap, gt40 heads, better headers, and underdrive pullies.. Also told me that the 7.5 rearend on my car was meant for 4 banger foxes.. How do underdrive pullies work?
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Underdrive pulleys do what their name says; they under drive the accessories . They spin certain accessories slower so they don't "soak up" as much power.
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I would stay away from under drives. Tap on those headers, if they are stock they WILL be steel. You can look for an 8.8 rear end anywhere. They should be under every V8 stang from 86 till now. Of course look for the 86 to 93 for the proper width.
Three bar heads would be nice with the RPM air gap intake. You will get a nice raise in compression.
Jerry
Jerry
Three bar heads would be nice with the RPM air gap intake. You will get a nice raise in compression.
Jerry
Jerry
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What's bad about underdrive pulleys? And I'm already searching for headers & heads. Still gotta order the air gap intake.:baller:
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They slow down the alternator and water pump enough to possibly cause charging and cooling problems. For the 5 horse they might release isn't worth the price unless it's a drag car only. Just my opinion. I'm sure others have had decent results from the pulleys but I have heard many complaints about under drives over the years. If you run heavy traffic, aftermarket stereo, and plan to drive the car as a daily then I would spend the money elsewhere. Just sayin. Please keep this thread going as you modify the car. I have an 85 also and am super interested in your build. Keep the ideas coming, I'm loving it.
Jerry
Jerry
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