blu00rdstr

Hi guys,

I'm looking for advice from the experts here. I'm rebuilding my next motor myself this time, and want to check to see what's hip these days.

Bottom End (388ci all-bore)
- Block .... Katech LS1 4.125" bore
- Crank ... Stock LS1 3.622"
- Rods .... Eagle H-rods 6.125"
- Pistons . Wiseco forged (K395A125 -8cc = 10:1) or (K393A125 -25cc = 8.6:1) (pdf)
- Rings ... Wiseco W100F8-4125-5
- Bearings . Clevite
- Timing .. Dual roller no tensioner block (no holes on LS1 block)

Top End
- Heads .... West Coast Cylinder Head Racing / A&A LS1 Stage 2 CNC heads 70cc (link)
- Gasket .. GM MLS (can I get this in 4.125"?)
- Cam ...... 224/227 .563/.569 114 LSA
- Pushrods . Manley 7/16" Chromoly
- Lifters .... Stock LS1
- Rockers .. Stock LS1
- Exhaust .. Melrose headers/cats/Z06 mufflers

Fuel
- Racetronix intank pump
- RC 72lb injectors
- Boost-A-Pump
- Stock lines
- Stock fuel rails
- 2000 Vette fuel system (non-return)
- No Meth

Blower
- D1SC1 (was pushing up to 17psi on 347)
- 3.2" pulley
- 8-rib setup
- HKS BOV
- FMIC
- Solid steel elbows (3" blower to IC, 4" IC to MAF)
- Silicon hose straight connectors (www.turbohoses.com)

Drivetrain
- FLP L5
- Vigilante 1800 stall
- Stock halfshafts
- No trans brace
- Nitto 555R (305/35-18)
- 1/4" aluminum belly pan
- T1 sway bars, adjustable links

The things I currently have doubts about are; lifters, fuel system, no meth, CR (10:1 or 8.6:1?), cam, heads, and BOV. Any mistakes in the combo?

Mike94ZLT1

iTrader: (3)

Yes, 2 big ones right here:

67RSCamaroVette

iTrader: (63)

the word, "hip," isn't hip. Sorry, i had to.

i would upgrade half shafts, and go with the lower compression pistons if it were me.

blu00rdstr

Yeah, I was born in the mid '60's. A whole decade we could've done without (just don't ask me about the '80's).

So, two for halfshafts. And trans brace and low CR then. I'm a little concerned about the heads (the proheads site says they're good for up to 3.9" bore). Maybe I should pop for the L92 heads and springs (and rockers assemblies) and L72 manifold. Since I just had my heads freshly rebuilt and they're still in packaging, maybe I sell them and cover the cost of the swap.

I also found the Rollmaster timing set I have doesn't have the Twis (?) chain, so I'll just get the Twis (was considering the Katech chain).

3.4camaro

iTrader: (1)

I would go with cadillac racing lifters and swap out the GM MLS gaskets for Cometic ".040 MLS gasket. You can get them in whatever bore you want.

Mike94ZLT1

iTrader: (3)

Agreed... If you're set on using stock rockers, I would send them to Harland Sharp to get modified, they press out the old trunion and shitty seals holding the bearings in, and replace it with a longer grooved trunion with snap rings, which prevents the rockers from puking bearings into an engine you just dumped a ton of money into. Your stock rockers may be ok, but for me, I didn't want to risk it.




You can kinda see on those 2 pics of my engine the modifications HS did. Plus they give you sweet Hex-head bolts to hold them on with

blu00rdstr

I don't know too much about the cadillac racing lifters, I read some were using them. How do they help?

Those harlan rockers look pretty good, what does that cost? Would the same mod apply to L92 rockers (if I go that route)?

Mike94ZLT1

iTrader: (3)

Caddie racing lifters are good to a higher RPM, something ridiculous like 8500... if you don't plan on spinning that high and want to save some $$$ just use LS7 lifters, they're like $100 a set and will take more abuse than a regular LS1 lifter.

I bought these rockers used from a forum member for $200, I'm not sure what HS charges to do the modification, but I would do it to any rocker with a pressed in bearing!

Beaflag VonRathburg

iTrader: (176)

If you're going to be running that engine to the high RPMs it was built for you're going to be majorly overspinning that blower. I'd say go with a 4 inch crank and have a 427. More pump gas power, lower blower speeds, etc...

It will also give you much more potential in the future.

Ideally:
4.125 bore
4 inch stroke
6.125 rods
8.6:1 cr
Cheap heads (L92s would work well)
More money, but cheaper than aftermarket castings (LS7 Heads)
Caddy Lifters
Cometics with a smaller compressed ratio to help with quench depending on deck height

Built Rear
Built 6 Speed manual (conversion)
Textralia twin disk clutch

Much more power:
F1C or F1R blower

Problem solved

blu00rdstr

I should look into the Caddy racing lifters, are they the same height as stock or do I need to also replace pushrods? Definitely those harlans look good, I did a search and they're like $250 to have done.

I thought about a 4" stroke, but the crank is another $1,000 and the 347 already has way enough torque to fishtail below 65mph, so I can't put any more torque to the ground with the Nitto 555R DRs (going to 555R2 for better handling). When it's floored the motor is shifting at 6,200 and enters the next gear at about 4,000, so the horsepower curve should be between 4,000-6,500. A4 vettes exit the 1/4mile in 3rd gear between 5,000-6,000rpm (120-142mph), so more higher end HP would be good for the track.

I tried cometics before and they leaked after a few hundred miles, replaced them with GM MLS and had no problem with the GM gaskets.

I am interested in the L92/L72 combo ...<searching>... just found a drive by wire package http://www.slponline.com/view_product.asp?P=12294 for $1,700. Hmm.

Thanks for the suggestions!

staringback05

iTrader: (8)

Bigger Ci Muahahaha