AAM Intake Manifold Q
 

Yes I know, there's a ton of info on it and I've read about it. We actually experienced approx 35 hp loss with the manifold so originally took it off and went with the stock intake manifold. HOWEVER, if I'm able to run more boost (20-24lbs) safer, I'd rather go that route and lose the 4% hp. Has anyone actually had issues with their stock manifold cracking or failing?

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Ask Seb what he thinks. Headgasket's start popping at 24psi of boost even if you have a RJM closed deck block and ARP 625's. Not sure how your motor is built but I would be more worried about that. Have you look inside the manifolds runners? You may find some casting flaws that need to be cleaned up. I ran 22 psi sparingly with no issues.

yep! Have Seb Scheduled for 2/13 for a full tuning visit. JMS did a great tune but there's nothing quite like having the "godfather" of all Z's having a look ;)

The JMS Stage 2 Shortblock build included JMS Spec CP Pistons/Carillo Rods, ARP Mains Studs, New Main, and Rod Bearings.

Did have the Cosworth Head Gasket added during the build but again always like to get his input. I'll probably just bring the intake manifold with me and have him take a look at it.

I am in agreement with Spooler. That manifold is only good if it is ported and polished. You would be better off doing a GTR manifold conversion. Just Spooler pointed out the issue is head gasket problems when you get above 18 psi which is long before the upper manifold becomes an issue. The oem manifold will start to fail at about 25 psi. My two cents, don't fix what's not broke!

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Do you have a closed deck block and what head studs were used? I am just asking to help prevent you from doing a blunder like I did. Seb is going to grill you anyways. LMAO.

Sorry to thred hijack what comp ratio are you guys running on your fi builds ?


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I run E85 so I stayed stock compression ratio at 11:1.

This is EXACTLY what I was looking for! Read on a previous thread when I was researching AAM, that OEM manifold started to fail at anything above 20lbs and that's what started my brain going haywire.

Copy that!

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Yep, closed deck option added, ARP L19 Head Stud Kit

As spooler mentioned there seems to be quite a few running different compression ratios. I'm running Wiseco Piston 9:1

I wouldn't do a GTR manifold conversion. The runners are too long and will cause issues in the midrange.

sometimes reading previous threads is a great thing, othertimes it starts a spiderweb of thoughts and worries. lol

Never heard of a stock manifold failure. Im sure it will eventually let go if you keep increasing boost pressure.

Your signature says youre running 800ftlb torque.. that is approaching (if not well-in) the danger-zone for VQ headgaskets. You could be an exception. But if you are looking to stay on the safe side of things, I wouldnt be worried about your intake manifold I would be worried about your headgaskets.

700ft/lb at 4550 RPM and mine were done. It appears the higher the RPM the peak TQ is, the lesser of a problem it is.