qnitro

iTrader: (24)

Ok.. here is the question. I have a LQ4 Im building, I am looking at the L92 heads

These are from Scoggin-Dickey, 12582713 Scoggin-Dickey 798.50, Im using the car-craft article as reference http://www.carcraft.com/techarticles...ocker_arm.html

So they are 798.50, plus springs. Lets say they end up being 1100 for springs and heads shipped. I am also looking at the texas-speed set up, but is much higher priced. Whats the difference?? I AM!! building the car-craft set up, but if I can get some benefit from I will consider it?

Thanks in advance.

tspence45

iTrader: (30)

The difference is that the TSP heads are ported, and have aftermarket valve springs in them, which you'll need unless you plan on running a stock cam. They'll make a decent amount more power than the stock L92 heads from Scoggin-Dickey. By the time you buy an aftermarket valve spring kit for the stock L92's, from SD, it's going to end up costing you only a couple hundred less than the TSP heads, but they won't flow as well.

69LT1Bird

iTrader: (1)

Why not just go to Scroggin Dickey's site and look up information instead of getting the wrong info on here.

GMPP heads stock and upgraded springs

SD's own CNC ported heads

qnitro

iTrader: (24)

Hmmm those L92 Heads flow pretty good out of the box. If I get the TSP heads, can I drop a bigger cam...and get benefit?? The HP that Car-craft came up with are pretty good.. Maybe someone from TSP and give me some insight?? Stock bottom end LQ4 with the carb set up

Sales2@Texas-speed

iTrader: (5)

As stated, the PRC heads are fully CNC ported with a competition valve-job, your choice of valves, and the spring kit of your choice as well! When you price around the CNC work and all, the PRC heads are very competitively priced for the performance you gain versus a stock L92 head!

qnitro

iTrader: (24)

Yeah I looked the the upgrade springs one..and came up with the 1100 number.. they flow like crazy..L92/L76 fully assembled Factory GM cylinder head for your GEN3 or 4 engine. Stock "out-of-the-box" heads will flow over 320cfm! Im running a stock bottom end..

qnitro

iTrader: (24)

Good info.. Luckily.. I'm not so concerned about price..Im just looking for benefit vs dollars on a stock bottom end..( let me quantify stock, Im going to have the bottom done, bearings, maybe .30 over.., im not boosting or nitrous)

5.3LJimmy

iTrader: (10)

The intake flow on out of the box heads is good, but the exhaust flow is a bit on the low side. The CNC heads will pick up the exhaust flow making them a better overall head. Getting air in the cylinder quickly doesn't do much good if you can't get it out efficiently.

Sales2@Texas-speed

iTrader: (5)

The exhaust is weak relative to the intake port, but not when you compare the LS3 exhaust to the old exhaust ports in the cathedral port heads and such. Nobody ever really complained much about their exhaust flow though.

It's really just a matter of picking a camshaft with the right exhaust valve events to help all of that air out.

69LT1Bird

iTrader: (1)

Here is a good comparison, Edelbrock big block Chevy heads

http://www.edelbrock.com/automotive_...erf_rpm3.shtml

Edelbrock BBC 320 intake and 211 exhaust @ .600

L92/LS3 at about 320 intake and 208 exhaust @ .600

Not sure where its lacking either.