Looking for opinions, suggestions, etc. for the 383 combo i'm putting together for my 88 IROC.
If anyone could run this through desktop dyno, i'd be grateful for your time and help.


1988 350 2-Bolt Roller Block.
Eagle Bilet Spalyed Main Caps Installed.
Eagle 4340 3.750" Stroker Crankshaft.
Eagle 4340 6.000" 3-D H-Beam Connecting Rods.
Clevite H-Sieres Bearings
Mellings HV Oil Pump With Hardened Shaft.
SRP 9.8:1 Forged Dish Pistons (pump gas is a must).
Plasma Molly File Fit Rings.
ZZ4 Roller Cam, Duration: 208/221 Lift: .474"/.510" Lobe Separation: 112.
GM Hydraulic Rollers
Dart 200cc Iron Heads, 64cc Chambers, 2.02"/1.60", Gasket Match Porting.
Cloyes True Roller Timing Set (degreed straight up).
Comp Cams Pro Magnum 1.5 Roller Rockers.
Edlebrock Base Manifold, Siamesed 2.500" & Port Matched To The Heads.
SLP Runners, Siamesed 2.000" On Top End.
GN Plenum, Siamesed At Runners & TB End.
52mm TB With Airfoil.
24lb-30lb SVO Injectors As Required.
Edlebrock Shorty Headers (no a.i.r.).
3" Exhaust With Performance Cat & Flowmaster Muffler.
MAF System With Fair Attempt At Proper Chip Burning.
Ignition Duties Will Be Handled By MSD.

 

Nice parts list, some questions:

What bearing clearances did you measure at the mains and rods?

What crank runout did you measure?

What side clearance did you measure at the rods' big-end?

What endgap at the rings?

What piston clearance?

What head gaskets are you using?

What lifters?

What injectors?

What oil pump?

 

The parts list has been amended.
All clearances will be set upon assembly as per my machine shops specs.

 

I love the bottom end parts, and love the heads...

But the cam is lacking... MUCH LACKING IMO. Hey you asked for opinions. I would say go for at least the LPE 219/219 w/ that setup.

I think the LPE219 cam w/ the LTR setup and the 383 would work well together. Not what I would necessarily run, but it would be a great COMBO.

Headers will work for a while, but the added air requirements of the 383 will want more exhaust flow...

I would start looking for 1 3/4" headers...

my $.02

 

I think it was chevy high performance that did a recent article on headers for a 383. It showed shortys making waaaaaay more torque up to 4000, and only giving up 10-15hp up top. I think the choice of cam is ok depending on where you want to make power.

I think revving to the moon is cool but making buckets of torque without having to rev is nicer for the street.


Anyhoo thats my $0.02

 

Ya that cam is too light. That motor is BEGGING for spray, so I would go with a Comp Cams NX288HR.

As for headers, for spray bigger is better. Heres what I just bought for my race motor

http://cgi.ebay.com/ebaymotors/ws/eB...RK%3AMEWN%3AIT

Otherwise, you will be ok with 1 5/8 or 1 3/4 SLP shorties into a mufflex style exhaust. This was my former setup and I still have it laying around.

 

I may jump to the LPE219 that I have read so much about here.

REAL, do you have the 1-3/4" headers and do you wanna sell them?