461 stroker advice - Pontiac GTO Forum
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post #1 of 14 (permalink) Old 11-08-2013, 08:46 AM Thread Starter
 
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461 stroker advice

I have a 69 gto with a 400 but do not know what the internals are.The cam has been changed and has #62 heads with an Edelbrock rpm intake and 750 edelbrock carb.The transmission is a 200r4 rebuilt to handle 550 hp into 3.55 gears.I also have a 70/71 complete 400 block with 96 heads.The engine in the car now is # numbers correct for the vehicle so I wanted to make the spare motor into a stroker.I was looking to get 400-450 hp with iron heads.I was wondering what heads would be the best to get ported.I plan on using
1-cvms
2-butler
3- Kaufmann
I want to get the rolling assembly,porting and cam from one supplier and assemble myself.
Also should I get the intake ported to the heads.

Thanks
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post #2 of 14 (permalink) Old 11-08-2013, 11:22 AM
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You need to talk to BearGFR on this forum. He's BTDT, with good results.
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post #3 of 14 (permalink) Old 11-08-2013, 05:32 PM
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I have to ask, why iron heads? You can put near as much $$ into some ported iron heads as you would spend on aluminum and with the aluminum you can keep your stock compression. Not to mention the weight savings, more efficient combustion chamber, screw in studs, new valves.......
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post #4 of 14 (permalink) Old 11-08-2013, 07:17 PM Thread Starter
 
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I hear ya.If i find out that aluminum heads cost roughly the same i will go that route.I was trying to go the sleeper route.I was also thinking of going back to the Quadrajet with cliff ruggles help.
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post #5 of 14 (permalink) Old 11-08-2013, 10:51 PM
 
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I have Edelbrock aluminum heads on my 474 built by Butlers, along with their rotating assembly in my '68, and this motor screams. Butlers have great customer service and are easy people to talk to. I also have a new high performance 200 4r with 373 gears, its a great set up.
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post #6 of 14 (permalink) Old 11-09-2013, 02:58 PM
 
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420 hp or so is in reasonable reach with low cost iron heads. From what I have seen, I would not spend money on porting iron heads. Just go to aluminum at that point...

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post #7 of 14 (permalink) Old 11-10-2013, 07:23 PM
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The problem with iron heads on a stroker is compression - too much of it.

If you want someone else to build it, I'm a big fan of CVMS. Aluminum heads can be painted (I did mine) and if you're highly motivated you can even grind off the logos.
I'm running an 800 cfm Qjet on my 461, on a single plane intake. The car so far has run a best of 11.86 at the track, and also made the whole Hot Rod Power Tour this summer.

Iron heads can be made to work, but you'll have to make compromises, spend almost as much as you would for aluminum, and won't make as much power.

I'd be willing to talk in more detail if you like.

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post #8 of 14 (permalink) Old 11-11-2013, 11:13 AM
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Iron heads also put a LOT more weight right over the front axle...right where you don't want it.
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post #9 of 14 (permalink) Old 11-11-2013, 03:43 PM Thread Starter
 
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Thanks for all the info.
Lots of stuff to ponder.
I really don't know if my drivetrain could handle 500 plus hp.Thats why I wanted to use iron heads but should I give up the stroker idea and build a beefy 400 with aluminum heads, would that get me in the range I was looking for.
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post #10 of 14 (permalink) Old 11-11-2013, 05:32 PM
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Build the motor as you wanted as a stroker and if you don't put slicks on it and/or launch it at 4000 rpm the stock drivetrain should live until you can afford to upgrade it. I ran the stock 4 speed and 10 bolt behind my blown BB for a couple of years and it lived with the street tires and no powershifting.
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