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 pontiac 400 or stroke it to a 461???
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pontiac muscle
Tribal Scout

USA
35 Posts

Posted - 05 Mar 2014 :  5:38:49 PM  Show Profile  Reply with Quote
Ima just start with the block and take ot from there slowly....Its gonna be street driven never gone to the track maybe go once in a while....want it to run on 91 octane gas...the more hp and tq the better

Latech
Cochise

USA
397 Posts

Posted - 05 Mar 2014 :  7:17:25 PM  Show Profile  Reply with Quote
Depends on a few things.
If your crankshaft is rough, you might as well.
It is recommended that you run 5140 rds or similar to help build lower end strength.
And you will need pistons. All that comes in the kit so....
And if you are running Iron heads from the 400, depending on the chamber size, increasing the stroke will give you a decent CR for a bigger cam.
What heads are you running?
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GtoGuy32
Cochise

USA
842 Posts

Posted - 06 Mar 2014 :  03:17:33 AM  Show Profile  Reply with Quote
What's your budget?
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pontiac muscle
Tribal Scout

USA
35 Posts

Posted - 06 Mar 2014 :  05:53:00 AM  Show Profile  Reply with Quote
I have a 350 now but gonna get a 400 block and would like to run aluminum heads...want to build it myself ima take it slow so budget wise ill buy few parts a month
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GtoGuy32
Cochise

USA
842 Posts

Posted - 06 Mar 2014 :  1:32:50 PM  Show Profile  Reply with Quote
If you are going to go with AL heads and take it slow, I'd invest in the stoker. You get way more out of it if you want the most HP and Torque you can get.

I think 500-550 hp and 550-600 ft lbs wouldn't be out of the question with the right cam, porting, and a strong lower end.

If you went with a 400, it's prob safe to say you'd get about 100hp/tq less than the stroker for a similar build.

The bigger cubes will also be more steetable...better idle and vacuum characteristics and higher torque at lower RPM.

That's my vote.

Lots of guys on this forum have engines like you describe. Talk to Bear, he has a stoker with AL heads making tons of power and running high to mid 11s in a 4000 lb car that is mainly setup for the street.
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pontiac muscle
Tribal Scout

USA
35 Posts

Posted - 06 Mar 2014 :  5:23:07 PM  Show Profile  Reply with Quote
I like those numbers...stroker..
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pontiac muscle
Tribal Scout

USA
35 Posts

Posted - 06 Mar 2014 :  5:24:19 PM  Show Profile  Reply with Quote
Whats a great rotating assembly crank rods pistons
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GtoGuy32
Cochise

USA
842 Posts

Posted - 06 Mar 2014 :  5:33:50 PM  Show Profile  Reply with Quote
Eagle has a rotating assembly kit. It should include forged h beam rods, cast crank, forged pistons....somewhere in the 1600-1800 range.

It's a great value. Mr Pbody (Jim) is a great resource to ask the fine details of a build and can quote you something.

I have a stroker with iron round port heads Jim built and it's making about 510 hp / 550 ft lbs. It's a great street engine, smooth a reliable and runs high 11s.

I think you'll be happy with this path.
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pontiac muscle
Tribal Scout

USA
35 Posts

Posted - 06 Mar 2014 :  8:14:00 PM  Show Profile  Reply with Quote
Nice...most 461 builds ive seen around the forums run like on 93 octane would it be hard for it to run on 91 octane
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GtoGuy32
Cochise

USA
842 Posts

Posted - 07 Mar 2014 :  01:41:39 AM  Show Profile  Reply with Quote
Is that all you have in your area? What is your elevation above sea level?

Depending upon where you wind up in compression ratio, it's likely not an issue.

Tell your builder (or consult a builder to help select parts) all of your limitations and wants when you start this project.
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pontiac muscle
Tribal Scout

USA
35 Posts

Posted - 07 Mar 2014 :  05:46:25 AM  Show Profile  Reply with Quote
Yes 91 octane the highest...elevation idk gotta check on that
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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 07 Mar 2014 :  09:19:40 AM  Show Profile  Reply with Quote
LA is about 300 ft above sea level. The cooling system will have to be at 110%.

I stumbled across a new to me cooling system mod. The front two coolant passages are plugged on both Decks of the Cylinder Block. This allows coolant fresh out of the radiator and w/pump to travel further back in the Block before it turns up into the cylinder head. Reducing the coolant traffic jam at the intake crossover.

Im going to try in on my next build in conjunction with the 428 mod.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.

Edited by - Blued and Painted on 07 Mar 2014 09:37:32 AM
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bigD
Indian Spirit

USA
643 Posts

Posted - 08 Mar 2014 :  11:30:00 AM  Show Profile  Reply with Quote
quote:
Originally posted by pontiac muscle

Whats a great rotating assembly crank rods pistons




Butler sells 'em for about $1590 + shipping-balanced.

http://www.butlerperformance.com/products/engines_assemblies/rotating_assemblies.html#461_467

Here's an assembled 400 stroker shortblock for comparison.

http://lenwilliamsautomachine.com/455_Short_Block.html
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