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#26 |
Registered User
Join Date: Oct 2009
Location: Denton, Texas
Posts: 1,721
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Re: 1968 327 reubuild, vortec heads or not?
I hear what everyone is saying about the double hump heads and that the Vortecs flow so much better. That is one of the reasons why I was on board with using them hence why I purchased the ProMaxx units as I thought the earlier style intakes would bolt on. They are advertised as being drilled for both the vortec style intakes and the non-vortec intakes.
With that being said I am considering purchasing these aluminum heads 185cc intake runner, 72cc combustion chamber, 2.02"/1.60" valves. The heads are still ProMaxx Performance, just not vortec style. http://www.jegs.com/i/ProMaxx-Perfor.../2171/10002/-1 |
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#27 |
Registered User
Join Date: Nov 2012
Location: Mexico, NY
Posts: 559
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Re: 1968 327 reubuild, vortec heads or not?
You might want to ask him what the quench distance is and if you can run a thinner head gasket to gain a little more compression with those larger style heads. I recently ditched my 0.040" thick head gaskets (FelPro 7733PT2) for a thinner 0.015" gasket (FelPro 1094). The change in thickness and diameter of the fire ring reduced the combustion chamber by 5cc and gained a half a point of static compression. I figured it went from 9.1:1 to 9.6:1, and runs fine on regular octane still. It could be more or less for you depending on your cylinder volume, don't assume you'll gain half a point in compression too, you need to run the numbers.
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'84 K10, SM465, NP208, 3.42 Gears, 33x12.5-15 GM 4 bolt 880 roller block, 062 Vortec Heads Comp Cams XR258HR-10, MSD Street Fighter HEI Edelbrock: Performer Intake 2116, 1405 Carb Long tube headers, 2.5" duals to Flow Master Super 40's Vortec Engine Build Last edited by Marshy; 08-25-2016 at 07:01 AM. |
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#28 |
Registered User
Join Date: Oct 2009
Location: Denton, Texas
Posts: 1,721
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Re: 1968 327 reubuild, vortec heads or not?
Just to update everyone, I ended up going with the ProMaxx Performance aluminum non-vortec heads, the 72cc ones.
The engine was broken in on the dynometer at the machine shop who rebuilt the engine. Peak torque was 336.8 Lb-Ft @4200 rpms. Peak horsepower was 308.3 @5600 rpms. I took the delivered the motor to another shop to do the motor swap. Finally a little over a month it is due to be installed Wednesday morning. I am nervious and excitied to finally be at this point. I'm hoping everything goes well. |
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#29 |
Registered User
Join Date: Oct 2009
Location: Denton, Texas
Posts: 1,721
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Re: 1968 327 reubuild, vortec heads or not?
First picture of my truck delivering its new heartbeat.
2nd & 3rd photos are of the motor after painting Chevy orange. |
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#30 |
Registered User
Join Date: Oct 2009
Location: Denton, Texas
Posts: 1,721
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Re: 1968 327 reubuild, vortec heads or not?
I'm really hoping that I can get some photos of the final assembly before install. I am told they are doing the final assembly of the motor tomorrow.
I am going with a rubuilt 4 barrell Quadrajet. |
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#31 |
Registered User
Join Date: Aug 2013
Location: Fort Worth, TX
Posts: 309
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Re: 1968 327 reubuild, vortec heads or not?
That will be a good engine for your truck. Those power ratings will work well for a daily driver. Enjoy.
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#32 |
Registered User
Join Date: Dec 2016
Location: Ronkonkoma
Posts: 76
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Re: 1968 327 reubuild, vortec heads or not?
Those look like some nice numbers. I love the filler neck on the intake. Good luck on the install.
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#33 |
Registered User
Join Date: Oct 2009
Location: Denton, Texas
Posts: 1,721
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Re: 1968 327 reubuild, vortec heads or not?
Just wanted to update this, the 350 has been pulled and the rebuilt 327 is installed. i have had the truck for just over a week.
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#34 |
Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: 1968 327 reubuild, vortec heads or not?
I hate be a negative kill-joy but those numbers aren't so great. All your power is at the 4200 to 58OO rpm range way above your normal driving range. Also it will probably cost you more to drive than if you went with the vortecs and premium gas.
A GM vortec crate engine will beat those numbers by a long shot for just a little over $2000. I hope you don't take this personally. I don't mean it as an insult to you in any way and I hope you get many years of good use out of your motor but I think your builder could have given you better advice. |
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#35 |
Registered User
Join Date: Aug 2016
Location: Miami fl
Posts: 289
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Re: 1968 327 reubuild, vortec heads or not?
Very nice man congrats ... I've read through this thread .... regardless the final specs are for the engine , it's gonna feel probably a bajillion times better than the old motor .
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M.A.G.A. ![]() |
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#36 |
Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: 1968 327 reubuild, vortec heads or not?
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#37 |
Registered User
![]() Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: 1968 327 reubuild, vortec heads or not?
Well this has been up for a while and I would love to here if your happy with your build. Have you any afterthought on those heads? I have considered them for a long time with today's ethanol based fuels.
It does look fantastic with what you have wanted to accomplish. I complement even more your choice of valve covers. |
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1968, 327, c10, factory stock appearing |
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