Blown SC motor - need rebuild advice! - 450hp target
 

Ok, I got greedy - had a perfectly good and quick 95 LT1 with 120000 miles on it - I was running 7lbs of boost just fine - then tried to go to 9lbs on stock pistons - must have got a little lean - I think i put a hole in a piston - man i am pissed off and bummed out - but o'well -time for a rebuild!

Here is my plan for the rebuild based on what I have read so far - any feedback is welcome on my selection, especially on cam selection - my target is 450hp and 450tq at the rear wheels.


Pistons -Speed Pro Dished TRW-L2441F30
Rings -Total Seal TSR-T3690-30
Camshaft -Comp Cams 304 CCA-07-304-8
main bearings -Clevite 77 CLE-MS909HG
cam bearings -Clevite 77 CLE-SH290S
rod bearings -Clevite 77 CLE-CB663HN
Head Gaskets -Fel Pro HP FPP-1074
Lifters -Comp Cams Extreme CCA-8954-16
Rods -Eagle I Beam ESP-5700BBLW
Headers -Pacesetter PSM-72C2239
Main Studs - ARP ARP-134-5601
Balancer -ATI ATI-917268

Planning on using the stock crank.
Unsure if I am wasting money on the balancer
I am also playing with the idea of putting a 383 stroker kit on the motor, but don't know if the extra money is worth it or if I really need to.

I would not reuse the old crank. You should go with a forged 383 stroker.And You should get LS7 racing lifters; they are only $219 from gmpartsdirect.

Whats your budget? And the stock crank will be fine for 450rwhp.

Ya know that's 540+FWHP. It might hold up but it would be above my limits, especially in a 2 bolt block.

2 bolt block??? I thought the LT1 Trans Ams had 4 bolt blocks?? If not, I am bummed -

My budget is ~2000 not including machine work.


I like the lifter suggestion - didn't know they would fit.


I am definately leaning towards the 383 kit with the steel crank included


After doing some reading I am thinking this cam is a better selection:
COMP extreme CCA-224-236-14
Duration 224 236
Lift @50 with 1.6rrs .537 .556
Lobe center 114



Lastly, any input on balancer? At 9lbs, should I have my machine shop put a key in my stock one or just buy the aftermarket one?

At 9 lbs, you'd probably be perfectly fine just having the stock hub keyed. But you got greedy once before, you'll do it again. Plan bigger that way you have room to improve.

And that cam would definatly be better than the first one. Your only doing this one time though, so why not spend the extra $100 to get a custom ground blower cam? I mean, really, what is $100, to get something with the exact manners you wanted.

Not. Nothing special with the LT1 f-body no matter what model unless it was a SLP LT4 SS.

2 bolt block and the stock crank is going to be fine for what you want to do..

what head unit are you using?

You going to use the SC again?

Yes, planning on using the supercharger at 9lbs of boost

I have the 600b.

I called comp cams - they suggested I go with
Comp Cams 07-468-8
576/570, 230/236, 113 lsa

if I don't stroke and

Comp Cams: 584/579, 242/248, 113 lsa

if i do stroke it out to 383


I also think I am going with JE pistons 131636 even they are about 300.00 more...they get a little closer to the 9.25 compression ratio I would like.

i dont think there is anything wrong with the crank to be making around 500whp and i would personally rather rev the **** out of a well built 355 than have a few extra ft lb down low, and do you have ls7 lifters cause they did not work for me and i know of one other person having problems with them right now and i got em for 105

and dont forget a few 97 models that the left over vette blocks made it in to, but not mine of course

I ordered the forged SCAT 383 kit today.....H Beam rods and JE pistons.....I figured I might as well build it bigger and strong in case I get greedy again.

So my heads are stock castings, ported/matched and polished with stock valves and LT4 springs.

Looking at the cam size suggested I realize I need to get new valve springs....can I avoid dual springs and having to cut the heads? Which springs?

Also, what about the valves? Should I get larger valves put into the heads or is it a waste of money? If larger, what size
2.00"/1.570"
or
1.985"/1.555"

You may want to check with Procharger regarding the P600-B as it will be more difficult to make the kind of boost you want with a 383.