ZZ383 / hood clearance
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Joined: Jul 2005
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From: Yuma Az
ZZ383 / hood clearance
Have any of you guys out there installed the gm zz 383/425 stroker? Im getting ready to drop one in my 79 and I dont know if I'll have hood clearance problems. Any gouge appreciated, make me proud!
Melting Slicks
Joined: Sep 2004
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From what I've seen the gm zz 383 is sold without an intake manifold. And hood clearance is going to depend primarily on your intake manifold.
GM ZZ 383
They recommend this manifold "GM dual plane intake P/N 12366573 may be used for hood clearance on the ZZ383/425" but claim that it will cost you 15-20hp.
But keep in mind most manifolds that are too tall will still fit with a drop base air cleaner and an element that is either only 2 or 3 inches tall.
GM ZZ 383
They recommend this manifold "GM dual plane intake P/N 12366573 may be used for hood clearance on the ZZ383/425" but claim that it will cost you 15-20hp.
But keep in mind most manifolds that are too tall will still fit with a drop base air cleaner and an element that is either only 2 or 3 inches tall.
Last edited by enkeivette; Oct 17, 2005 at 03:22 AM.
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Joined: Jul 2005
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From: Yuma Az
thanks for the reply, I put on the single plane intake manifold, simply because the lower dual plane losses power, about 25 horses, just couldn't do it. The engine looks sweet though, the block is red with a march pully kit, chrome valve covers + timing chane cover, chrome accessories and MSD dist. If a 2" air cleaner work Ill wait till I drop the motor and try that. I also saw a holley air cleaner that has two filters that sit above the valve covers with some kind of manifold in between. Looks interesting.
Burning Brakes
Joined: Sep 2004
Posts: 1,167
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From: Ft.Worth Texas
Do you have power steering? Might want to check pulley clearance at the crossmember with that march system. I have to use short water pump on mine and ps only clears by about 3/4 inch max. with v belts.
Le Mans Master
Joined: Oct 2001
Posts: 6,798
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From: Pine Bluff Arkansas
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-‘19-'20-'21
Originally Posted by johnyrundle
thanks for the reply, I put on the single plane intake manifold, simply because the lower dual plane losses power, about 25 horses, just couldn't do it. The engine looks sweet though, the block is red with a march pully kit, chrome valve covers + timing chane cover, chrome accessories and MSD dist. If a 2" air cleaner work Ill wait till I drop the motor and try that. I also saw a holley air cleaner that has two filters that sit above the valve covers with some kind of manifold in between. Looks interesting.
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Melting Slicks
Joined: Dec 2004
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From: pr, frederick md.
i have a 383 with a air gap and a demon carb. i use a drop base air cleaner with a 3" filter. no mods or hood changes for my 78'. and unless your cranking 4500-5000+ rpm all the time, that single plane is COSTING you 25 horse. common knowlege that dual plane manifolds deliver MORE power than a single plane at almost ALL rpms, losing out at only the higher rpm's.
Melting Slicks
Joined: Jun 2002
Posts: 2,844
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From: Orrtanna Pa.
I just put a 1/2"spacer under my Vic Jr / 3310 carb and with the 14" dropbase air filter, the hood still closes.Only 3/8" clearance when I checked it with my kids silly putty.Thats on my 80 with the 406.
Last edited by The Money Pit; Oct 19, 2005 at 12:49 PM.
Le Mans Master
Joined: Oct 2001
Posts: 6,798
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From: Pine Bluff Arkansas
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-‘19-'20-'21
Originally Posted by johnyrundle
so did you replace the hood, or what is the drop down, is that a type of air cleaner?
