Help me build my 427 . . . details inside
Thread Starter
TECH Fanatic
Joined: Nov 2001
Posts: 1,064
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From: CA
Help me build my 427 . . . details inside Ok, I have decided on the 427 motor for my car. Will be primarily used at the track with the occasional weekend road cruise. I will be spraying at least a 200 shot and moving into a TH400 trans next month.
Speed inc will most likely do the motor, so I took the specs from their site (minus the mods I already have)
From the list below, what should I upgrade or get instead of for a reliable 427 that can handle everything I throw at it? Also, what size cam?
Anything thing to add? All comments welcome!!!
-MTI Darton resleeved block
-Billet 4.00” stroke forged crank
-Billet 6.125” connecting rods
-Diamond Custom 4.125” pistons
-Diamond Pro-select rings
-High performance bearings
-All Gaskets, seals and hardware
-Custom Comp Cams Roller camshaft
-Comp Cams Lifters
-Comp Cams chrome moly pushrods
-Double roller timing chain (already have)
-SLP blueprinted oil pump (already have)
-ASP SFI approved underdrive pulley (already have)
-RGR, MTI, Patriot, or GTP stage 3 premium cylinder heads (have stage II, can they be ported into stage 3 or should I get new heads with the motor)
-GM LS6 Intake manifold (already have)
-Fully balanced/blueprinted/Finish hone w/torque plate, assembled (wtf does this mean
)
-Hooker coated or SLP headers (already have SLP)
-Offroad y-pipe (already have)
-Fidanza aluminum flywheel (will get with TH400 swap)
-Taylor 409 Race wire 10.4mm LS1 Red (already have)
-NGK spark plugs (gonna need new ones anyway)
-Hypertech 160 Powestat (already have)
-SLP, Whisper or MTI Induction lid (already have)
-SLP high flow bellows
-High flow 30# Injectors (have 42.5 already)
-Everything Professionally Installed
-Fully Professionally Dynotuned
Speed inc will most likely do the motor, so I took the specs from their site (minus the mods I already have)
From the list below, what should I upgrade or get instead of for a reliable 427 that can handle everything I throw at it? Also, what size cam?
Anything thing to add? All comments welcome!!!
-MTI Darton resleeved block
-Billet 4.00” stroke forged crank
-Billet 6.125” connecting rods
-Diamond Custom 4.125” pistons
-Diamond Pro-select rings
-High performance bearings
-All Gaskets, seals and hardware
-Custom Comp Cams Roller camshaft
-Comp Cams Lifters
-Comp Cams chrome moly pushrods
-Double roller timing chain (already have)
-SLP blueprinted oil pump (already have)
-ASP SFI approved underdrive pulley (already have)
-RGR, MTI, Patriot, or GTP stage 3 premium cylinder heads (have stage II, can they be ported into stage 3 or should I get new heads with the motor)
-GM LS6 Intake manifold (already have)
-Fully balanced/blueprinted/Finish hone w/torque plate, assembled (wtf does this mean
)-Hooker coated or SLP headers (already have SLP)
-Offroad y-pipe (already have)
-Fidanza aluminum flywheel (will get with TH400 swap)
-Taylor 409 Race wire 10.4mm LS1 Red (already have)
-NGK spark plugs (gonna need new ones anyway)
-Hypertech 160 Powestat (already have)
-SLP, Whisper or MTI Induction lid (already have)
-SLP high flow bellows
-High flow 30# Injectors (have 42.5 already)
-Everything Professionally Installed
-Fully Professionally Dynotuned
I would get differant headers. You need at least 1 7/8" on large cube motors. You may want to consider getting and LSX intake also. If you plan to spray over a 200 shot you may want to get a set of nitrous pistons. What about head and main studs? Differant rockers? Just tossing some ideas at you.
Thread Starter
TECH Fanatic
Joined: Nov 2001
Posts: 1,064
Likes: 0
From: CA
Originally Posted by theblur98ss
I would get differant headers. You need at least 1 7/8" on large cube motors. You may want to consider getting and LSX intake also. If you plan to spray over a 200 shot you may want to get a set of nitrous pistons. What about head and main studs? Differant rockers? Just tossing some ideas at you.
TECH Junkie
Joined: Aug 2002
Posts: 3,726
Likes: 0
From: Fort Collins, CO
If that were my car, I would go with the Kooks headers. I would probably use a 1 7/8th header with a 2" collector. The car should see significant gains, especially on the nitrous.
The only other real change I would make is that I would have Steve @ Race Engine Development sleeve my block. He is the co-inventor of the sleeves and the most qualified to install them. He's also an LS1Tech sponsor.
The only other real change I would make is that I would have Steve @ Race Engine Development sleeve my block. He is the co-inventor of the sleeves and the most qualified to install them. He's also an LS1Tech sponsor.
Originally Posted by MeanWS6
any other input . . .thanks guys 
Let us know if we can help.
Last edited by Brian Tooley Racing; Aug 7, 2004 at 06:43 AM.
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As KingCrapBox stated, I would contact Steve @ Race Engine Development. I was about to go the 427 route, but time and money kept me at 396. Anyway, he spent a good part of a Sunday on the phone with me (I didnt expect a call back until Monday morning). I know my next LS1 will be a 427 and will be sleeved by Steve!
David
David
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DO NOT USE DIAMOND PISTONS WITH A RESLEEVED BLOCK. It tore up my bore and it was because of the pistons. This is from a MOST RELIABLE source. I have been down that road before. Listen to me........ or not, its your wallet.
TECH Junkie
Joined: Aug 2002
Posts: 3,726
Likes: 0
From: Fort Collins, CO
How could the pistons tear your bore up? There are plenty of people using Diamond pistons on a re-sleeved bore and none of them seem to be having any problems? Who is your 'most reliable' source?
My SOURCE IS THE SOURCE OF SOURCES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Diamond Pistons have some sorta skirt or something that is not good for the block. I forget what EXACTLY he said. I am now in the process of getting JE pistons after my block was ruined. MeanWS6 pm me if u want to talk to me or the source. Bear
I don't understand how a piston that's used in other Darton MID blocks, that work just fine, can cause the bore to be damaged?
What exactly about the extra skirt on the Diamond pistons is causing these issues?
Not a bash or anything, just really would like to see the mechanical explanation.
Thanks man.
What exactly about the extra skirt on the Diamond pistons is causing these issues?
Not a bash or anything, just really would like to see the mechanical explanation.
Thanks man.
TECH Junkie
Joined: Aug 2002
Posts: 3,726
Likes: 0
From: Fort Collins, CO
Originally Posted by Bear
My SOURCE IS THE SOURCE OF SOURCES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Diamond Pistons have some sorta skirt or something that is not good for the block. I forget what EXACTLY he said. I am now in the process of getting JE pistons after my block was ruined. MeanWS6 pm me if u want to talk to me or the source. Bear
Originally Posted by KingCrapBox
I think your source might be full of it. Maybe he's protecting himself and placing the blame on Diamond? Why don't you explain to everybody what happened and what you were told by your source. That way you can help others from making the same mistake you did.
The only mistake I made was using JPR. 
Originally Posted by Bear
Once again, my source is THE source!! He didnt build my motor, BUT HAS HAS SEEN THE RESULTS!!! Use your heads and ask yourself who is THE foremost authority on Darton MID Blocks. When you figure that out you will have your answer. The only mistake I made was using JPR.
The only mistake I made was using JPR. Steve Demirjian??
You guys said it, not me. I dont think Steve wants to **** off Diamond or anything, nothing wrong with the actual pistone per say, just that he doesnt recommend them for the Darton MID resleeved blocks. Thats all there is to it.