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Old 11-28-2012, 02:05 PM
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406 help

Hey im new to getiing a engine built i have a factory sbc 400 im getting it bored.30 over i am shopping around for a 406 rotating assembly i am looking for 12.1 compression i have a dart platinum eagle top end kit 215 64 ccheads dart intake what would be a good cam choice any info will b apprecited it will go in a 86 monte carlo ss it has 8.5 rear end 4.10 gears th350 trans with 3500 stall will be a sreet/strip car thanks

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Old 11-28-2012, 02:35 PM
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You plan on 12:1 with cast iron heads? better have a huge cam in it, it wont like the street much.
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Old 11-28-2012, 02:49 PM
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Oh no sry they are aluminum i already have brodix ik 200 heads but i was looking at the dart top end kit
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Old 11-28-2012, 02:59 PM
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I was planning to mix 93 and 110
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Old 11-28-2012, 03:12 PM
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I had a 383 in the car but the car was stolen. The 383 i bought complete it ran best time of 8.27 on 89 octane in 1/8 mile dnt no any specs on that motor just trying to do honework on this 400 before i spend money in wrong place
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Old 11-28-2012, 03:31 PM
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How much does head porting on average run
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Old 11-28-2012, 03:46 PM
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I have a victor junior intake and a demon 750dp would they work ok for this setup
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Old 11-28-2012, 04:08 PM
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Yeah the heads are 64 cc yeah im new to the game i wanna learn as much as i can how and what do i need to cean up on the heads and scale of 1 to 10 how difficult is it for a amateur
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Old 11-28-2012, 06:40 PM
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get your heads on a flow bench.2 reasons.if the flow numbers are good then you know your horse power potential,therefore easier to pick the matching parts,second reason,lots of heads are weak on the exhaust side, so they need porting on the exhaust side or you can compensate slightly with a split duration cam.

If you dont measure the flow and build the engine,later if you are not happy,you have no information to work with.That car will dip into the 11s with those heads stock out of the box.The quality job you do depends on the details you look after,,,,have fun with that car.I worked on a friends monte carlo and we made it go 14.1s with a near stock 400 and 2.73 gears. It also got decent mileage.
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Old 11-28-2012, 07:30 PM
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Thanks for the info im going to take them to my machine shop and let him flow bench them
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Old 11-28-2012, 07:56 PM
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phone the shop before you go,not all or many shops have a flow bench
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Old 11-28-2012, 08:09 PM
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Yeah im going to take them to coupe performance out of covington ga
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Old 11-29-2012, 02:21 AM
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Can I ask you about the 400 block??. Are you sure it is a good core??. Those are getting kind of rare. Especially on a 400 you don't want a bore and hone without the pistons in the hands of the machine shop and do not do that without torque plates.A extra step is to sonic check the bores because some are casted as thin wall blocks.You need to know you have a sound bottom end before you spend money on the top haft,don't you??. Don't you need to know you have a flat deck before you plot out heads and SCR's??. Here again the 400's trait isn't to have a used engine with flat decks.

I did see you said a factory 400.but I am not sire what you mean in saying that.Still most of what I posted still applies even if it is a brand new casting.

BTW-have you called Brodix and asked them how much to port good used clean castings??. I would bet money they have a killer porting program that would be hard to match. Even if you have to pay more,you get tons more back in return.

Last edited by 1Gary; 11-29-2012 at 02:27 AM.
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Old 11-29-2012, 03:32 AM
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Quote:
Originally Posted by gamedawg03 View Post
Yeah im going to take them to coupe performance out of covington ga
They did a subframe for me a while ago. Did a good job. You run at Head Hunters?

Last edited by cobalt327; 11-29-2012 at 03:37 AM.
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Old 11-29-2012, 09:14 AM
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Yeah i was going to go last sunday i called mandrell he said aslong as its over 50 degrees he would have track open
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