Hi all, I am installing a new intake and need some advice. I have a zz4 crate motor installed in my 87. I am installing a nice Accell Super Ram on it with a 58MM Billet accell TB. What I am looking for is injector size. Is bigger better or will it flood the motor. Right now I am using accell 24LB injectors. On another note, my heads do not have the heat bypass hole for the EGR valve, is leaving the EGR in place(smog) going to hurt anything or should I have it deleted from the chip? Thanks in advance for anything you have to offer.

 

Here are the engine specs. Nothing internal has been changed with the exception of the addition of roller rockers.

ZZ4 350 Tech Specs

Block Part Number: 10105123

Block Type: Cast iron with 4-bolt main caps

Bore x stroke (in): 4.00 x 3.48

Camshaft duration (@.050 in): 208 degree intake / 221 degree exhaust

Camshaft lift (in): .474 intake / .510 exhaust

Camshaft Part Number: 10185071

Camshaft type: Steel hydraulic roller

Compression ratio: 10:1

Connecting Rod Part Number: 10108688

Connecting rods Type: Powdered metal steel

Crankshaft Part Number: 12556307

Crankshaft Type: Forged steel

Cylinder head Part Number: 12556463

Cylinder head Type: Aluminum; 58cc chambers

Displacement (cu in): 350

Engine Name: ZZ4 350:

Engine type: Chevy small-block V-8

Ignition timing: 10 degree BTDC @ 800 rpm 32 degree total @ 4000 rpm with vacuum advance disconnected

Maximum rpm: 5800

NOTE: Distributor with melonized steel gear MUST be used with long blocks and partial engines with steel camshafts, or engine damage will occur.

Piston Part Number: 10159436

Pistons Type: High-silicon aluminum with offset pins

Recommended fuel: 92 octane

Rocker arm ratio: 1.5:1

Rocker arms Part Number: 10089648

Rocker arms Type: Stamped steel

Valve size (in): 1.94 intake / 1.50 exhaust

 

24s are fine for a ZZ4. I have a ZZ4 cam in my 87. Pretty mild cam.

 

Thanks for the info. I was thinking the same thing. Just wanted a second opinion.

 

That big TB won't do anything but lighten your wallet.

 

for proper fuel injector size ....google "fuel injector size calculators "

 

Handy tools. Looks like the 30's would be better. Thanks

 

The 58mm TB is too big for a 350 cu.in. It will kill your low end tork. My 86 with 1.6 roller rockers, and a super ram ran much stronger with the stock TB than with a 58mm.

Injector flow(lbs./hr) = (HP X BSFC)/(#of injectors X 0.8)

BSFC is 0.4 to 0.6 so use 0.5, and a reasonable approximation of flywheel HP