NA 427 Build After Dropped Valve

As the result of a dropped valve due to a broken Comp 918:

http://www.ls1gto.com/forums/showthread.php?t=226572

I had to upgrade while I was fixing it right? Just got the motor back from the machine shop today and was able to put it. Here's what its got:

Compstar (Callies) 427.6 ci (7.0L) Rotating Assembly includes:
-Forged Crank Shaft (4.0” stroke)
-Forged Rods (6.125”)
-Forged Wiseco Pistons (4.125)
Darton performance Dry Sleeves
Patriot Performance Stage 3 CNC'd LQ9 Heads with five-angle valve job, 72cc Chambers
ARP Head Bolts
Clevite Cam and main Bearings
DM Performance Main Girdle with custom ARP Main Studs
SLP Double Timing Set
SLP Performance Oil Pump
Comp Custom Grind Cam: .238 .240 w/ 586 589 lift & 112 LSA
Comp Hardened push rods
Patriot Performance Dual “Gold” Valve Spring Kit, Includes:
- Titanium retainers
- Machined bases (seats),
- Super 7 Locks, &
- Viton Rubber Seals.
Patriot Performance Ferrea 6000 series stainless steel intake (2.02) and exhaust (1.57) valves
Comp High Energy Roller Lifters
Comp Pro-magnum SS Adjustable Roller Rocker Arms 1.75 ratio, 5/16th guide plates
Cometic Head Gaskets

Gasket thinkness: .040
Deck Clearance: 0
Static Compression Ratio: 10.85:1

Other mods the Car will have or already has:

Ported Typhoon Intake Manifold with fuel rails
Port and polished throttle body
ASP underdrive pulleys
47 lb injectors
Stainless Works Long Tube Headers
3 inch off road pipes
Magnaflow catback with X pipe
NGK Spark Plugs TR6
Volant cold air intake
Kollar Poly Motor Mounts
Dyno tune by Nick Williams at Williams Performance

SPEC Stage 3+ clutch
SPEC Billet Steel Flywheel
GMM short throw shifter
DSS 200mph, 900HP Aluminum driveshaft
Rear end fluid replaced with Torco and FM type F
Tranny Fluid : Royal Purple

Pedders strut top bushings
Pedders parts installed by part #: EP9166S, 5851, 5403S, 5030S
Koni adjustable shocks (front and rear)
Tein Spings
Hotchkis Sway Bars (front and Rear)

I have most of the "blue prints" in case you are curious about a spec.

Pic:






Excuse the old guy (my dad)



More to come as it is completed, broken in, and dyno tuned.

A few More pics:

if u don't mind me asking what it cost u to do the short block?

nice. This is what i want, just would like a bigger cam and better heads.

Awesome. And apparently you voted, too.

You guys want to adopt a sister? Seriously way to go bigger and better. I'm not sure what I'm going to do yet. Will figure that out when I find out what exactly happened.

i wouldnt use the royal purple tranny fluid !!!

Quote: Originally Posted by dkrowner... if u don't mind me asking what it cost u to do the short block?

Well...for the short block...maybe $3000 or so in parts, Darton sleeve install was $1500, and the other block work and assembly was about $2000.

Including all the head work, valve train and clutch, I've got over $9 grand in this motor. I wasn't planning to spend that much. I just wanted to fix it with a few upgrades; but of course one thing led to another. When I started this project I didn't believe that people were spending 10 grand on a good NA motor build but now I am a believer.

And I could have spent more, i.e. better heads and a new cam(I'm using the one that was in the car before it exploded). But I'm out of money on this project...for now.

Quote: Originally Posted by ChrisLs1... i wouldnt use the royal purple tranny fluid !!!

Why? Anyone else agree? What should I use?

I have RP synco in my tranny and holding strong at 710tq

Very Nice!

Yha, I think if my tranny goes, it won't have anything to do with a RP, but probably something to do with close to 600 crank hp(estimated).

thanks for the info on the cost,i've been looking into the katech 427 ls2 shortblock

Got the intake manifold put together, the interior back together, the drive shaft on and the tranny filled! A few small steps closer.

NICE!! Man i got lucky when one of my 918s broke...ill NEVER go with COMP again(long story).

Wow, you did get lucky. But now you don't have an excuse to build a 427! Hehe

Quote: Originally Posted by GTOyeah... Wow, you did get lucky. But now you don't have an excuse to build a 427! Hehe

HAHA yea you right! Cant wait to see some numbers and vids

wow nice motor! can't wait to see a video posted...i like how ya think, well shit if its broken, and its being torn apart, might as well go bigger and better while were in there

awesome build!!! cant wait for some more pics

Knock sensors in, starter in, crank and cam position sensors in, intake mani on. More pics are on the way. I have drill this weekend so it will be a few days before I work on the car again and update ya'll.

Update(didn't want anybody to think I forgot):

Car's back together and at the tuner. Of course my computer was locked up by the last tuner so had to deal with that...only disaster #8457632 for this build. Should be tuned pretty soon. I'll also have some more pics up soon as well.

Picked up from the tuner today! They just put a good base tune on it for the break in. It has some valve train noise. I strongly believe that some of the new rockers are hitting the baffle in the valve covers. I'm going to pick up some spacers and get it taken care of. Then drive it about 400-500 miles and back to Nick at Williams Performance to get a good dyno tune. Pics are still coming.

Quote: Originally Posted by GTOyeah... Picked up from the tuner today! They just put a good base tune on it for the break in. It has some valve train noise. I strongly believe that some of the new rockers are hitting the baffle in the valve covers. I'm going to pick up some spacers and get it taken care of. Then drive it about 400-500 miles and back to Nick at Williams Performance to get a good dyno tune. Pics are still coming.

Sweet. I bet you're pumped. Can't wait to see some #s and vids. I bet its a beast!

More Pics:

On the balancer





Line bore machine


Other stuff

Great looking motor. You'll love the power-on-demand. I am very happy with my 427 so far.

How come you didnt go bigger c.i. with the Darton sleeves?

is there any particular reason you went with Darton sleeves vs. a new block? the only reason i could see is that you can use ported stock heads with a sleeved LS2, where as with a LSX block you need the new 6 bolt design heads.

With an LSX block you can use any of the exhisting heads. All the bolt patterns are the same. The LSX block has provision for the extra bolts which dont have to be used. As for the new block, if he wanted a 427 then he would have to use either an L92 block or LS7. Since he had the LS2 blockall he had to do was getting it sleeved. The Darton sleeves are very strong and looking at the thickness they can be rehoned whenever he wants to freshen up the block.

Quote: Originally Posted by Oh4GTO... How come you didnt go bigger c.i. with the Darton sleeves?

Quote: Originally Posted by phantomgoat04... is there any particular reason you went with Darton sleeves vs. a new block? the only reason i could see is that you can use ported stock heads with a sleeved LS2, where as with a LSX block you need the new 6 bolt design heads.

Well I was just going to go with a 403 but then my machine shop found a cracked cylinder. I wanted to keep with an aluminum block for weight and price was not too bad. About $1500 installed. When I started this project, it all depended on the block being in good shape. I was too far in to get a new block.

I was still going to keep the 403 as I already had the rotating assembly. I sent the block to another shop up north for the sleeves. Of course the block came back with the wrong sleeves in it (too big). At that point I traded my diamond 4.030s for Wiseco 4.125 pistons. I was worried that I was starting to build an all out race motor. This is supposed to be my DD so I just kept witht the minimal 427. But the sleeves are suposed to be able to handle out to 4.160 bore. Not sure what that is...434?

More pics...these are the most recent as I continue to battle the valve cover clearance issue. I ordered some spacers but of course every one is back ordered. Who knows when I'll have them. Hopefully next week some time.