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Old 01-31-2011, 12:40 PM
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cooling a peformance engine

i have a 2 core 31X19 all aluminum radiator and i want to cool a pontiac 400 stroked to a 468 10.5:1 cr edelbrock aluminum heads 750 series carb also edelbrock aluminum roller rockers undecided on cam yet have no clue were to even start their torker 2 intake everything is ported and polished... anyway i wanna cool it with my 31X19 aluminum radiator that should be enough right i dont know how it could get any better but i thought id ask because i v had people say this engine would be harder to cool then the factory...

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Old 01-31-2011, 01:49 PM
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Should be fine but only one way to know for sure, What type fan and shroud are you going to be running with this radiator ? What brand radiator is it anyway ?


Cole
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Old 01-31-2011, 02:12 PM
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Are you using an OEM 400 block, 4.124 x 3.75? What's the bore/stroke for this 468, something like 4.185 x 4.25?

I'm sure it's been done, but seems pretty aggressive, even for a Pontiac block. I"m curious what the clearance issues or problems are with that stroke, over and above a measly 383 Chevy.

Last edited by 68NovaSS; 01-31-2011 at 02:28 PM.
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Old 01-31-2011, 02:42 PM
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Quote:
Originally Posted by eloc431962
Should be fine but only one way to know for sure, What type fan and shroud are you going to be running with this radiator ? What brand radiator is it anyway ?


Cole
be cool brand with a dual electrics attached
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Old 01-31-2011, 02:46 PM
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Quote:
Originally Posted by 68NovaSS
Are you using an OEM 400 block, 4.124 x 3.75? What's the bore/stroke for this 468, something like 4.185 x 4.25?

I'm sure it's been done, but seems pretty aggressive, even for a Pontiac block. I"m curious what the clearance issues or problems are with that stroke, over and above a measly 383 Chevy.
its actually a 467 7 and 8 are to close on the keyboard 4.250 inch crank 4.181 bore 6.800 rods

came as a kit i got it from butler performance also thought id add it seems agressive if you think about it 400 to a 467 but you have to remember Pontiac used the same block on almost all their v8's only difference between the 400 and a 455 is bore and stroke

Last edited by rtyauch301; 01-31-2011 at 02:58 PM.
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Old 01-31-2011, 06:25 PM
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Quote:
Originally Posted by rtyauch301
its actually a 467 7 and 8 are to close on the keyboard 4.250 inch crank 4.181 bore 6.800 rods

came as a kit i got it from butler performance also thought id add it seems agressive if you think about it 400 to a 467 but you have to remember Pontiac used the same block on almost all their v8's only difference between the 400 and a 455 is bore and stroke


i'm not a pontiac guy so i've never played with the 400, i have no doubt that pontiac used the same blocks for their 400 as the 455 but you have to think about the alighnment of the bores, from centerline of the cylinder to centerline of the next cylinder is not likely the same in a 400 as it is in a 455. chevy did the same thing from 396-454, but you're not going to find someone punching a 396 out from 4.094 to 4.250 as well as stroking it up to a 4.00 crank.

i just looked up the bore and stroke of both the pontiac 400 and 455, and see that bore wise there isn't a great deal of difference so i would say that is very possible but stroke wise the are almost .5" apart. and you say that you are using a 4.250" crank so that is a full .5" increase in stroke. now like i said i dont know much about pontiacs but that does seen like a whole lot to increase the stroke on a OEM block, it will require some serious clearancing (i would think)
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Old 01-31-2011, 06:33 PM
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I too am searching for a radiator for a much tamer Pontiac 400. The only thing I would check is the radiator tube diameter. Hopefully it's 1".

BT
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Old 02-01-2011, 06:37 AM
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Stewart Components has a guide to high performace cooling on there site in tech tips here:
http://www.stewartcomponents.com/Tech_Tips.htm
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Old 02-01-2011, 06:53 AM
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The Pontiac block will swallow a 4.25"/4.5" stroke crank w/o much clearancing at all- mainly up at the front of the block.

From BUTLER:




Last edited by cobalt327; 02-01-2011 at 07:01 AM. Reason: Reconfigure images.
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Old 02-01-2011, 02:16 PM
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wow, i didn't know that
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Old 02-01-2011, 04:01 PM
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what i did to cool it

hey rt, jessebelle here. i have a 65 dodge coronet 440. it has a supercharged 440, .030 over, 6-71 gmc blower, 2-650 double pump holly's,makes 9psi-boost-600+h.p. exhaust manifolds are cast iron, replicated from the 60's. exhaust is 3" tti. 727 automatic, 3:93 posi rear end. all detailed, as is yours. i read in hot rod mag, drain/flush cooling system throughly. use a 180 degree thermostat. an aluminum radiator is mandatory, and fabricate an aluminum shroud to direct all air into the radiator, not around it. i used an electric fan, as high a cfm as i could get, takes less hp away from the motor, i put it on an off/on switch, no fan thermostat, they are costly, not needed. pipe in a direct reading water temp gauge. re-apply the block plugs, close rad. petcock. refill the rad. with cold water, fire up, and when thermostat opens, top off rad. with water only, leaving room for expansion, and room for a container of WATER WETTER coling system additive(auto zone-$10.00). use a 16 psi or higher rad. cap. no anti freeze, water cools better. this really worked for me, incredable stuff. i drive the car on the street @190 degrees in summer. good luck, advise me on the results. jessebelle
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