Hello all. I'm new to the forum and have seen alot of great stuff here. I was wondering if any of you that have alot of experience with big blocks could look at my combo and see if it will work for my purposes? This will be going into a 79 z28 with 4spd and 3:73 gears.

Carb: Edelbrock 1411 750 cfm
Intake: Edelbrock Performer 2-O
Heads: 049's, stock valves, no porting, 118cc's
Block: Gen IV .030 over with speed pro .100 domed pistons, stock cast crank and stock rods, 2 bolt mains
Cam: Comp Cams Magnum 270H with matching springs
Dynomax 85110 Headers
Pypes 2.5 x-pipe duals with violator mufflers

I am looking for something in the 8.75:1 to 9:0 cr range and run 89 pump gas. This will be a street only ride. I want more of a off the line set you back in your seat ride rather than a top end screamer. Will this combo work? Do I need to change any of the components? Thanks for your help.

I've ran the Speed Pro L2465F's with the .215" high 25.70cc dome piston in a 188cc chamber with a static compression of approx 9.8:1 to 10:1 stock deck height an .039" composite gasket. The quench was .025 + .039 - .064" little big but no detonation and ran the XM278 H-12 cam = unbelievable torque and rev'd to 6000rpm. A STD Tranny really likes the 12 degree LSA Marine grind for street and HWY cursing and could burn 89 Octane. The Exhaust NOTE of that cam is superb.

If you ever want to pump up the engine you can get a 10.25 Static using a shim .019" Gasket = .044 quench or Zero Deck the block and run the .039 composite gasket = a .039 quench and hit an 11:1 static compression.

I'm attempting to point out the range of static compression and quench options running the slightly higher domed L2465F's pistons in a 188cc combustion chamber. Hp Range 535 to well over 635 on pump gas.

Actually my original components where identical to yours including the 750DP, Performer 2, cast crank, Muncie, 12 bolt 4:10's but with 9.8 L2465F's and XM278H-12. This combo really worked and pulled 3.08's gears very hard as well. It was virtually maintenance free. I've since updated to a mechanical roller running 10.5:1 threw 3.31 gears using the same pistons and can still run 89 octane if required by dialing in spark advance remotely with a HyFire VI.

There is nothing wrong with your engine compilation, and it will do exactly what you propose to do with it, but it has more potential with the L2465F's if you ever decide you want more.

Thanks for the info. I was going to go with the speed pro H693CP30 hypereutectic pistons but was told the .100's would be better. With the 049's I found just the opposite from reading posts and such. I think I'm going to bite the bullet and sell the .100 and go with the .210's. I just don't feel like changing pistons in the future.

Carb: Edelbrock 1411 750 cfm
Intake: Edelbrock Performer 2-O
Heads: 049's, stock valves, no porting, 118cc's
Block: Gen IV .030 over with H693CP .210 domed hypereutectic pistons , stock cast crank and stock rods, 2 bolt mains
Cam: Comp Cams Magnum 270H with matching springs,
270/270 advertised duration
224/224 duration @.050"
.510/.510 lift
Dynomax 85110 Headers
Pypes 2.5 x-pipe duals with violator mufflers

What kind of HP could I expect out this combination?

If you are already buying Pistons (but don't have them yet) you might consider a complete bottom end kit. Once you factor in the costs of remachining the stock crank and rods you aren't all that far off from a complete bottom end kit. If you get the kit you can go up to 489 (030 over) or 498 (060 over) with a .250 stroker crank. Very popular build that puts out a lot of twist.

Check out Eagle they put together some nice assemblies using JE SRP pistons, Clevite Bearings, Perfect Circle rings:
http://www.eaglerod.com/products/Chevy/big%20block/SS%20454%201pc%20assemblies.html

Something to consider

Download and install CompCam's "CamQuest Cam selection simulation" it provides a Graph Dyno Chart. Here http://www.compcams.com/camquest/default.asp

Use to establish Dynamic Compression Ratio, here: http://www.empirenet.com/pkelley2/DynamicCR.html

Do not dismiss the XM278H-12 with a 9.5 to 10.2 Static compression, It is very impressive cam with that compression range.

I don't think you need to upgrade your rotating assembly cast crank, Stock rods and hypereutectic pistons should be just fine. I've run that that similar combo up to 6200rpm+ with no problems, but highly recommend a strong Roller Rocker arm assembly like Pro magnums to prevent valve guide wear and keep the springs together. Other then that I might consider cross drilling the crank.

OH yah! Use a Mr Gasket .019" Steel shim Head gasket rather then a .039" composite to get quench down to .044" and compression over 10:1

You can expect somewhere around 500Hp/550ftlbs torque with that combo and do not necessarily have to burn Hi-Octane.