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intake manifolds

672 Views 13 Replies 9 Participants Last post by  55_327
I am getting ready to build a 360 sbc out of a 880 4 bolt block,its been machined lined ,decked bored,and I recently bought some aluminum heads for it ,these heads will fit either vortec style intake manifold or conventional ,my block does have third bypass hole for the water pump and mechanical fuel pump hole.To me it seemed simple to just set it up like old school 350 build but Im wondering if I might be missing something.or over thinking it,and another thing is Ive got my mind set on a air gap manifold,do I have to have it? motors going in a 4x4 jeep.there's other cheaper intake manifolds that do the same. other than the cooling part.I guess I should add that the runners are 200cc 68cc chambers,2.02 -1.64 valves,flat top forged pistons, .500/.510 cam, thank you
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Discussion Starter · #8 ·
Howard cams 180245-10,I'm running around but I remember that sorry
My take on air gaps...

Aluminum is highly conductive of heat. It's going to get just as hot as a non air gap, it will just take a few more minutes. If you're drag racing, it might help. On the street you want to get the engine up to temp as fast as possible, both for the health of the engine, and for air/fuel mix... getting off the choke... driveability, etc. Millions of tests have been done and it may account for a couple hp... which you'll never feel in your butt, but if it shaves .002 seconds off your quarter mile, it might be worth it.

My opinion is that air gap intakes are 100% gimmick. I might even go as far as snake oil. Squarely in the "bling" category.

In my builds, I typically keep exhaust crossovers. I want that intake hot. Does it cost me 2.7 hp? Yup. Gladly. I'll never miss it.
I understand,I was kinda feeling that way,for a air gap it $345 and for $285 u can get manifold gaskets bolts for traditional style same rpm.thanks
 

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Discussion Starter · #10 ·
If your engine will be subjected to prolonged low-speed lugging situations which you might get if off-roading is your gig, then the air-gap style manifold will help by keeping the intake charge a little cooler. Also, I would pay more attention to mid-range torque output for off-roading, and ".500/.510 cam" is a little much for that situation. Just sayin' . . . 🙄
yea I know, but it wont be offroading all the time,mostly will be on street and it has a 700r4 overdrive so that with the heads I have makes sense,if Im only offroading here and there,not rock crawling.The original engine had only 120 hp 160 tq,and that tfkin sucked!!!!!!!!now I will have 3.5x hp and tq,so idk
 

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Discussion Starter · #12 ·
I have tried just about every intake made, tunnel ram, airgap, rpm, and performer. For a street driven vehicle (sbc) with a cam under 270 degrees, Wait for it......stock older cast iron tall Quadrajet intake (No EGR) with Early Q-Jet carb. Great driveability and performance and about as simple as you can get. GM spent thousands of hours in research and development on this set up. IT works as long as you limit cam duration to acceptable limits for a street driven vehicle.
Just my opinion. Your mileage may vary.
Had good friend tell me that too,thanks
 
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