Help..New GMPP Vortec Heads?
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Pro
Joined: Jun 2005
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From: FL.
Help..New GMPP Vortec Heads?
I want to get My SB motor up close to 400HP. The combo would be
These Vortec heads listed at the Scoggin Dickey URL below, Plus GMPP Vortec Hi-rise manifold, GMPP self aligning full roller rockers, I have a Holly 670 street avenger sitting in a box and a complete AN fuel line. I put a L88 hood on last year to solve the clearance problem. Ill be putting in a new Hyd Flat tappet cam Max lift .488 & .509. Until I get a zz4 short block maybe next year, Everything will be going on my existing 4bolt main 2piece rear seal small block. Ill switch everything over to the zz4 all roller assy's when I get the cash for it.
My questions are, does anybody know anything about These heads, or anybody who is using them, is close to 400hp doable with this Combo. Also, any problem mounting my hooker sidemounts to them They are straight plug heads. I'd appreciate any help and advice or comments. Im not going to commit to this build until Im relatively sure Its a reasonable option over a more conventional engine upgrade.
http://www.sdpc2000.com/catalog/3129...inder-Head.htm
Thanks
Tom
These Vortec heads listed at the Scoggin Dickey URL below, Plus GMPP Vortec Hi-rise manifold, GMPP self aligning full roller rockers, I have a Holly 670 street avenger sitting in a box and a complete AN fuel line. I put a L88 hood on last year to solve the clearance problem. Ill be putting in a new Hyd Flat tappet cam Max lift .488 & .509. Until I get a zz4 short block maybe next year, Everything will be going on my existing 4bolt main 2piece rear seal small block. Ill switch everything over to the zz4 all roller assy's when I get the cash for it.
My questions are, does anybody know anything about These heads, or anybody who is using them, is close to 400hp doable with this Combo. Also, any problem mounting my hooker sidemounts to them They are straight plug heads. I'd appreciate any help and advice or comments. Im not going to commit to this build until Im relatively sure Its a reasonable option over a more conventional engine upgrade.
http://www.sdpc2000.com/catalog/3129...inder-Head.htm
Thanks
Tom
Melting Slicks
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From: New Cumberland PA
The deciding factor may be how high in rpms the engine is still making good torque. The Bowtie Vortec heads you picked out are new. I haven't seen flow data on the smaller ones, but the new larger Bowtie Vortec's flowed great. These new heads address some of the issues of the older L-31 heads: higher lift, valve covers, intakes. The downside is $$. A pair of L-31 heads cost less than one of these.
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From: FL.
Thats what I noticed too, they went after those limitation issues of the older vortecs, weak springs ect. And have that whopper of a price tag on them. Also, They use the Same high rise manifold as as those 400- 425HP aluminum head engines GMPP is Crating. I zeroed in on them a year ago , just before they were released, and My instincts were, they were perfect for a proggresive engine build that would last years in both worlds, touring highway(thats 80% of the mileage on the car) and hot, smoke tires and generally kick butt around town. Theres just no track records ,numbers or proof . Maybe some more info will pop up here on the forum and push me to go with em or switch the plan to a proven conventional combo.
I might do a "what combo to get 400hp Post in a few days, I think Theres alot of new aftermarket engine parts from a year ago.
I might do a "what combo to get 400hp Post in a few days, I think Theres alot of new aftermarket engine parts from a year ago.
Last edited by 69vettester; Jul 1, 2005 at 06:56 PM.
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Check this out; this shop is where I dyno tune, and I personally saw this motor in a car on the dyno make 400 rear wheel hp.....scroll down to the specs for the 383 CUBE / 450HP STREET MOUSE PUMP GAS:
http://www.redlinepd.com/enginepackages.htm
http://www.redlinepd.com/enginepackages.htm
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From: FL.
That motor is using the GMPP aluminum Fast burn heads, They are vortec Heads too, and a step up from the Iron bow-tie Vortecs. They dont say it but They may be using the The GMPP Hi-Rise Vortec manifold on that motor ? The price looks good for a shop built 383 stroker Motor,I think? Its more motor than Im wanting right now But I think its saying something when Good engine builders Use Major GMPP Vortec components To get the 425hp and big torque and still run on 92 octane. Makes me feel confident I could just bolt up a 380-400HP motor in my garage and no second guessing about it.
By the way...That is a monster Small Block you have.. WoW.. its bored and stroked to get 406 ,Right?
Thanks 7t2vette.
By the way...That is a monster Small Block you have.. WoW.. its bored and stroked to get 406 ,Right?
Thanks 7t2vette.
Last edited by 69vettester; Jul 1, 2005 at 10:14 PM.
Melting Slicks
Joined: Jan 2004
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From: New Cumberland PA
Originally Posted by 69vettester
But I think its saying something when Good engine builders Use Major GMPP Vortec components To get the 425hp and big torque and still run on 92 octane. Makes me feel confident I could just bolt up a 380-400HP motor in my garage and no second guessing about it.
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From: FL.
Originally Posted by mandm1200
I may be in the minority here, but what's wrong with GMPP. I think they offer a lot of quality, performance products. Perhaps the only downside is the price. They have street performance items to race performance items. They are involved in most, if not all, aspects of racing. For each step up in performance with GM, you got to open your wallet two steps. Doesn't seem fair but that's the way it is with them.
Yes, Thats what Im saying too. I want GM to be forefront in performance Technology, because Im going to buy and build my motor with GMPP components, Ill pay the price because I love Bow-tie logos on my Motor parts Pure and simple.
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I am now a believer in the GMPP Vortec heads and intake after that car was on the dyno. 400 rwhp with a mild hyd cam! Needless to say everyone in the shop had to pick their jaw off the floor after that run! We were all making fun of the whimpy Vortec heads beforehand! That price is in Canadian dollars, so it is about $6500 US to replicate that motor. The guy who built it was on a budget, and boy did he have a smile on his face that day! At some point in the funture I just may swap my heads and intake for the Vortec variety. My motor is a 400 with a 0.30 overbore to get 406 cu in, I currently have Edelbrock Performer RPM heads and Performer RPM intake, and I am making 330 rwhp and 380 rwtq.
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From: FL.
I scanned those specs up and down, looking for the Hyd. roller cam that I was sure would be there. Only a hyd. flat tappet in it, Amazing..
Of course, a Stock 400 bored. Looks huge too. Im thinking Youve got a big head start If you want to make it a monster mouse in the future, and a top shop at your disposal.. Im envious... If I had that shop in my neighborhood Id already be rolling with my vortec combo, Thats a fact. Ive been dragging my feet for months because I dont have pro help, to rely on.
Of course, a Stock 400 bored. Looks huge too. Im thinking Youve got a big head start If you want to make it a monster mouse in the future, and a top shop at your disposal.. Im envious... If I had that shop in my neighborhood Id already be rolling with my vortec combo, Thats a fact. Ive been dragging my feet for months because I dont have pro help, to rely on.
Last edited by 69vettester; Jul 1, 2005 at 11:52 PM.
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Thanks! My motor's bottom end is all killer forged, and I went conservative with the heads/intake/cam.............to start with!! 
A better view of my motor:
A better view of my motor:
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I swapped my stock 69 hood for a L88 hood last year, but didnt install the cold air box, I did it only for the clearance for this new top end Im going for. That looks real clean those cold air systems were a great thing, still are I see..ha.
Ill post an old pic of my engine compartment when I figure out how to do it.
Ill post an old pic of my engine compartment when I figure out how to do it.
Last edited by 69vettester; Jul 2, 2005 at 12:18 AM.
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From: Science Bitch! Mississauga, Ontario
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Originally Posted by 7t2vette
I am now a believer in the GMPP Vortec heads and intake after that car was on the dyno. 400 rwhp with a mild hyd cam! Needless to say everyone in the shop had to pick their jaw off the floor after that run! We were all making fun of the whimpy Vortec heads beforehand! That price is in Canadian dollars, so it is about $6500 US to replicate that motor. The guy who built it was on a budget, and boy did he have a smile on his face that day! At some point in the funture I just may swap my heads and intake for the Vortec variety. My motor is a 400 with a 0.30 overbore to get 406 cu in, I currently have Edelbrock Performer RPM heads and Performer RPM intake, and I am making 330 rwhp and 380 rwtq.
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From: Stewartville Mn
I just finished my 355ci with center bolt vortec heads. My set up includes 10.5:1 Keith Black pistons, eagle 6"rods, Lunati roller cam set up, 232 dur. .485 lift with Harland Sharp 1.6 roller rockers, I used a Professional Products Hurricane intake, Quick Fuel Holley 750, Pete Jackson timing gear set, Hedman Elite ceramic coated headers. Scat 10/10 crank, Mallory Unilite distributor, MSD 8.5mm wires and AC double platinum plugs. We did 7 pulls on the dyno and after tuning put up 427 hp/431 lbs. The heads are only good to about 6200rpm then the numbers really drop off. Feel free to drop me an email if you have any questions.
Hope this helps...
Jerry
Hope this helps...
Jerry
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From: central FL, near the beach.
topic is so popular i put 2 budget combos at the bottom of the page
http://community.webtv.net/MATTGRU/Dyno
http://community.webtv.net/MATTGRU/Dyno
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Originally Posted by Matt Gruber
topic is so popular i put 2 budget combos at the bottom of the page
http://community.webtv.net/MATTGRU/Dyno
http://community.webtv.net/MATTGRU/Dyno
Very Good articles, Both of them. And your Budget combo..
Last edited by 69vettester; Jul 2, 2005 at 06:20 PM.
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Here is a link to The GMPP Hi-Rise vortec manifold that they are putting on all their Vortec engines Making around 380 up to 425 HP.
I have the GMPP 2004 catalog and the specs say those engines have 9.1 to 10.1 CR's, they all have OEM roller cams, and all run on 92octane pump Gas. I find it hard to believe a motor making 400-425 HP with a 10.1 CR will run on 92 octane??? Ive always limited upgrades to 9.1 maybe 9.5 out of fear of not finding fuel and ruining the engine due to detonation. Maybe these are different days and the CR's can go up a notch or two???
http://www.sdpc2000.com/catalog/737/...e-Manifold.htm
I have the GMPP 2004 catalog and the specs say those engines have 9.1 to 10.1 CR's, they all have OEM roller cams, and all run on 92octane pump Gas. I find it hard to believe a motor making 400-425 HP with a 10.1 CR will run on 92 octane??? Ive always limited upgrades to 9.1 maybe 9.5 out of fear of not finding fuel and ruining the engine due to detonation. Maybe these are different days and the CR's can go up a notch or two???
http://www.sdpc2000.com/catalog/737/...e-Manifold.htm
Melting Slicks
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From: St. Petersburg, Fl///Columbus, Ohio
I started with an Iron head (Vortec) ZZ4 engine, Installed a GM Hotcam, And the tallest GM intake that would fit under my hood, 1.6 rockers and hooker headers/sidepipes and a new edelbrock carb. I've not been to a dyno but I'm 100% satisfied!!!
Last edited by jcswm; Jul 3, 2005 at 02:48 PM.