Generation IV Internal Engine - My 402 build...

I have this going on another site but figured I'd post it on here too. My 2006 GTO has about 80K miles on it and I've been wanting to rebuild it. Car is going to the shop in about 2 weeks. Waiting on a few minor parts to arrive. I'm going to let the shop spec out a rotating assembly.

Heads are....
LXR CNC Ported LS3 Heads:
New Design Castings with 11* Valve Angle
Fully CNC Ports and Combustion Chambers
4.080 Bore has 69cc Chambers
255cc Intake Port Volume
Relocated Valve Stem Centerlines
2.165” x 5/16" Stainless Intake Valves
1.600” x 5/16" Stainless Exhaust Valves
Lunati 73925 Dual Valve Spring Package
Flow 372-260 cfm at .700” Lift
http://i201.photobucket.com/albums/aa20/mouryrandall/20120708_193405.jpg

Intake is a ported L76 from Peak Speed Shop
http://i201.photobucket.com/albums/aa20/mouryrandall/IMG_4798.jpg
http://i201.photobucket.com/albums/aa20/mouryrandall/IMG_4799.jpg
http://i201.photobucket.com/albums/aa20/mouryrandall/IMG_4806.jpg


-Cam is a 247/254 .635 .621 on a 114LSA
-OEM rockers( offset LS3 intake rockers)
-Trunnion upgrade
-C5R timing chain
-Hinson motor mounts

Other parts I will be reusing are
-Ported LS6 oil pump
-Morel lifters
-Fast 57# injectors
-ARP head bolts

Nice! Those are some badass heads.
Should be a screamer, let us know what she puts out.

what crank are you going to use? sorry if i missed that

what crank are you going to use? sorry if i missed that

Well RPM in Garner, NC is doing the build. I was going to leave that in their hands.

i've heard a lot of good things about RPM, so i'm sure they will put together a stout combo. I'm definitely interested to see how these heads perform.

i've heard a lot of good things about RPM, so i'm sure they will put together a stout combo. I'm definitely interested to see how these heads perform.

Same here. They have done work to my car before. The heads were a pretty penny so I hope some nice numbers come out of this build.

nice setup, keep us posted on the outcome.

nice setup, keep us posted on the outcome.

Will do. All the rest of the parts come in this week and then its off to the shop.

I'm assuming you have an L92/LS3 block since you say you are going 4.080 because the LS2 can't go out to 4.080, plus that wouldn't make it a 402 anyway.

Very nice choice in parts. I couldn't afford those Mast heads for my setup:cry:

I'm assuming you have an L92/LS3 block since you say you are going 4.080 because the LS2 can't go out to 4.080, plus that wouldn't make it a 402 anyway.

Very nice choice in parts. I couldn't afford those Mast heads for my setup:cry:

Im reusing my stock LS2 block. Im not boring it out to 4.080 either. For the info on the heads it was saying that a 4.080 bore has 69cc chambers.

This is going to be an awesome setup. Cam selection will be crucial.

This is going to be an awesome setup. Cam selection will be crucial.

Did you see the cam I got in my first post? If so, what do you think?

Om also debating having them do an SD tune. I was originally going to buy a Fast 102 but read and seen that the LS3 Fast really didnt outflow a ported L76 that much. I can't wait for the build to be done.

Can't really say on the cam selection. It's a medium sized cam for a 402 so it will drive great without sacrificing top end too much. Your setup is different from everything that's out there so it may take more than one cam to get it dialed in right.

From what I saw on some other build, apparently VA Speed has a porting process for the FAST 102s that picks up good power. It's a matter of whether or not it's worth the $$$ for you.

Can't really say on the cam selection. It's a medium sized cam for a 402 so it will drive great without sacrificing top end too much. Your setup is different from everything that's out there so it may take more than one cam to get it dialed in right.

From what I saw on some other build, apparently VA Speed has a porting process for the FAST 102s that picks up good power. It's a matter of whether or not it's worth the $$$ for you.

Doesn't take much cam to make power with the heads he has. His cam is right on par to make well over 500 to the wheels.

Sounds good Randall, should move out pretty well! Car needs an auto swap!

Sounds good Randall, should move out pretty well! Car needs an auto swap!

Thanks Brandon. I'm sure it will get to that point eventually. Yours always impressed me.

Rockers and some other parts came in! My good friend Shane back home was kind enough to install the trunnion upgrade on my new rockers.

http://i201.photobucket.com/albums/aa20/mouryrandall/391391_239656969487936_1548860978_n.jpg

http://i201.photobucket.com/albums/aa20/mouryrandall/208932_239657759487857_2041596792_n.jpg

4.080 Bore

Thought you were making a 402 and sticking with a 4.000 bore?

Should make some good power. The 76 intake will cost you some power.

Love the heads, I was torn between those or the tf 235, should be a stout ass setup, good luck

Thought you were making a 402 and sticking with a 4.000 bore?

This is my first motor build and I'm no expert but I believe that is just describing the heads. My bore shouldnt change. I know the block will probably be honed.

I'm kinda learning as I go along here.:newbie:

Should make some good power. The 76 intake will cost you some power.

See I did alot of research on a LS3 fast 102 vs ported LS3/L76 intake and the results were poor for the 102. There were gains but they were minimal. I could spend the extra several hundred on a 102 and 102 TB and maybe see a 8hp gain. It just wasnt worth it to me. If anything restricts me it will probably be my MAF in which case I may just go with a SD tune.

After labor and parts this build will be around 10K so I have to save where I can. If Ryan at RPM says the intake is really choking the motor I will wait till tax season and do the Fast 102.

Thanks Brandon. I'm sure it will get to that point eventually. Yours always impressed me.

you have a slightly bigger cam and way better heads, I dont see why this car shouldnt break 550rwhp with the 6 speed. Plan on a mcleod twin disk! I also agree with your choice on the ported ls3/l76 over the fast 102. The ls3 is 230 new and will get you within 10 hp of the 102 setup. I had no complains about mine on my prc l92 combo. Whats the timeframe of completion?

you have a slightly bigger cam and way better heads, I dont see why this car shouldnt break 550rwhp with the 6 speed. Plan on a mcleod twin disk! I also agree with your choice on the ported ls3/l76 over the fast 102. The ls3 is 230 new and will get you within 10 hp of the 102 setup. I had no complains about mine on my prc l92 combo. Whats the timeframe of completion?

Thanks for the advice. You dont think my Monster level 3 will hold for long then?

And Shane has my car now. I'm waiting on new motor mounts to come in and then he is taking it to RPM. Should be going this month. I don't know how long it will take them to do everything though. My guess is a month.

I dont think there is really a single disk that will hold a stout motor setup at that weight, at least for track purposes. You could probably street drive it easily. But the mcleod will be worlds above what you have now,.

I dont think there is really a single disk that will hold a stout motor setup at that weight, at least for track purposes. You could probably street drive it easily. But the mcleod will be worlds above what you have now,.

Yeah makes sense. I seen Monster came out with a twin disc. I'm sure I'll switch to that or the Mcleod.

Nonsense. The level 3 monster will hold that power. If not monster will warranty it. The level 3 is good for over 700 ftlbs and there are other levels above that.

Let me clarify...I agree a twin would be a much better choice, however, why fix what ain't broken?

Let me clarify...I agree a twin would be a much better choice, however, why fix what ain't broken?

It may hold for a while. And your right, I do plan to throw all I can at my current clutch unitl it goes. We'll see how long that will be.

Going back to your FAST intake vs. L76. I did the same research you did before deciding on a FAST. Most of the engines that were stock cube whether it was 364,376, or 370 with a FAST 102 didnt pick up anything or even lost with a 102 on there. When it came to stroker setups I noticed the bigger cam motors would pick up more vs. the smaller cam motors but the strokers would pick up period, over smaller cubed motors. If it didn't there was another issue.

The L76/LS3 was designed well for stock cubed motors and a little bit bigger, but when you go 400+ cubes a FAST becomes the last piece of the puzzle to complement everything else.

I made 554rwhp through an unported l76 intake, i dont see a fast picking up enough power to justify the $6-700 price difference. I annihilated a single disk that was rated to 750 ft/lbs in less than 15 passes in a 3700 lb f-body. I would just do the upgrade to the twin disk now, while the engine/trans are out rather than worry about it leaving you stranded and having to pull it all back out again.I'm Proactive vice reactive I suppose.

I made 554rwhp through an unported l76 intake, i dont see a fast picking up enough power to justify the $6-700 price difference. I annihilated a single disk that was rated to 750 ft/lbs in less than 15 passes in a 3700 lb f-body. I would just do the upgrade to the twin disk now, while the engine/trans are out rather than worry about it leaving you stranded and having to pull it all back out again.I'm Proactive vice reactive I suppose.

I see your power Brandon and it makes me happy I went with the ported L76. Maybe if I get a bonus down the road I will get the Fast. Really, the highest HP 402 I have seen was in Nick Williams 402 Vette which made 470 I believe.

Theres alot I want to buy right now like a twin disc, new drive shaft, and a tru trac LSD but I really dont have the money now. I still have to pay for the rotating assembly and labor which should be around 5K total.

See I did alot of research on a LS3 fast 102 vs ported LS3/L76 intake and the results were poor for the 102. There were gains but they were minimal. I could spend the extra several hundred on a 102 and 102 TB and maybe see a 8hp gain. It just wasnt worth it to me. If anything restricts me it will probably be my MAF in which case I may just go with a SD tune.

After labor and parts this build will be around 10K so I have to save where I can. If Ryan at RPM says the intake is really choking the motor I will wait till tax season and do the Fast 102.

Trust me I know. It will peak early. Check out my motor it peaked at 5800. It will spin to 7400 but why when its all done by 6400. Your build will still be a fun ride. mine has been for 2 years. I have a Mamo 102 waiting to replace my 76 intake. Then we will really know.

Trust me I know. It will peak early. Check out my motor it peaked at 5800. It will spin to 7400 but why when its all done by 6400. Your build will still be a fun ride. mine has been for 2 years. I have a Mamo 102 waiting to replace my 76 intake. Then we will really know.

Its hard to tell what my power curve will look like right now. I have not seen these heads ran on another stroker. I have about a year left in the Marine Corps and trying to save a bit before I get out. The heads alone cost alot so I had to make smart cuts in the build with something.

This is one of the thread I read through and it gave me no reason to buy a LS3 Fast 102. Even another 402 guy said he gained nothing going from a stock L76 to a Fast 102.
http://ls1tech.com/forums/generation-iv-external-engine/1293067-l76-vs-fast-102-a.html

I see your power Brandon and it makes me happy I went with the ported L76. Maybe if I get a bonus down the road I will get the Fast. Really, the highest HP 402 I have seen was in Nick Williams 402 Vette which made 470 I believe.

Theres alot I want to buy right now like a twin disc, new drive shaft, and a tru trac LSD but I really dont have the money now. I still have to pay for the rotating assembly and labor which should be around 5K total.

just buy a short block from one of the sponsors, and sell your ls2, you'll come out only spending maybe $2-2500

just buy a short block from one of the sponsors, and sell your ls2, you'll come out only spending maybe $2-2500

I've looked into that. TSP's 402 short block is around 4500. I would still have to have things like my link bar lifters,head bolts, and oil pump pulled off my motor. I have a buyer for the heads and cam but not for the block. If I was home I could assemble the longblock and install it. I will shoot Ryan an email and see what options I have.

If this what you did? If so could you shoot me an email explaining how it all went down and what you got for your block?

I'm in for the #'s this puts down. Nice build.

Motor mounts shipped out yesterday. And I just got these Fast fuel rails from a friend. New fuel pump is getting installed now and the car goes in this weekend.

http://i201.photobucket.com/albums/aa20/mouryrandall/529994_241176756002624_200367451_n.jpg

I'm really interested in the final results.

Sick can't wait to see what this does.

I am subscribed as well, I am getting ready to pull the trigger on a 383/402/418 build, I have even considered a straight ls3 with big cam swap and selling my 50k ls1.
What are you hoping to make or think you will make with the research you have done.

I am subscribed as well, I am getting ready to pull the trigger on a 383/402/418 build, I have even considered a straight ls3 with big cam swap and selling my 50k ls1.
What are you hoping to make or think you will make with the research you have done.

Im seeing guys with smaller cams and heads that flow less make 530-550. I'd imagine my 3.91's and 19" wheels might kill a little power on the dyno. I dont see it being lower than 525 really.

In case you guys havent seen my car, here is a video I took of my current setup a while back.
http://www.youtube.com/watch?v=4IuB1kNItMA&feature=g-upl

Nice ride and sounds great, that's awesome anything over 500 and a good tq curve will be killer, I watched a video of A ls3 with ported heads,ported intake ,and a big cam make over 500 but TQ was not as high as the small cam strokers but cost wise I am tryin to decide what to do?
Im seeing guys with smaller cams and heads that flow less make 530-550. I'd imagine my 3.91's and 19" wheels might kill a little power on the dyno. I dont see it being lower than 525 really.

In case you guys havent seen my car, here is a video I took of my current setup a while back.
http://www.youtube.com/watch?v=4IuB1kNItMA&feature=g-upl

Nice ride and sounds great, that's awesome anything over 500 and a good tq curve will be killer, I watched a video of A ls3 with ported heads,ported intake ,and a big cam make over 500 but TQ was not as high as the small cam strokers but cost wise I am tryin to decide what to do?

Just do alot of research and talk to vendors. My car is at RPM right now so hopefully I'll have some numbers up in the next several weeks. My cam is not that big but I didnt want a huge cam. Something that worked well with the flow numbers of the heads and would be easy to drive day to day.

I'm in the same position right now.... trying to figure out if it's worth my money to stroke my LS6 block or just get a 402. Hell, I'd be happy with a stock LS2 short block at this point.

Heads will be AI 232's though, and of course the cam is coming from Ed.

Times like these I wish I was still in North Carolina.... The FBody scene really blew up after I left in 2005. I envy your build OP. Best of luck!

Any news on you build, looking foward to results!

Any news on you build, looking foward to results!

It has been at the shop for about a week now. Last I heard they had my old heads, cam and intake manifold off. I have someone going there to buy the old parts. I'm assuming the motor is already out. Shouldn't be too much longer before I have numbers up.

It has been at the shop for about a week now. Last I heard they had my old heads, cam and intake manifold off. I have someone going there to buy the old parts. I'm assuming the motor is already out. Shouldn't be too much longer before I have numbers up.

Awesome, you gotta be getting pumped.

Im fuckin' pumped. I wanna see some results with these headz.

Just throwing this out there. I know you looked into the FAST and a L76 intake, but did you look into a Vic Jr. style with a single plane throttle body or even a elbow?

Bump for results.

Im about to pull the trigger on my 402 w/ l92 build and im doing a very similar setup! I cant wait to see what this puts down!!! Definitely subscribed!!

Sorry I haven't posted updates in a while. I just called the shop Friday and they told me the motor would be done this week and in the car up and running the week after. I should have some numbers up by the 12th. There was a delay because we were waiting on a few parts that were not in stock like the pistons.