I am about to build a 327 for my 79 Malibu, im going to use stock crank, and a set of Manley aluminum 5.7 rods, arp rod bolts, speed pro pistons (10.5:1) edelbrock victor jr aluminum cylinder heads (2.08 1.60 valves and 64cc chambers) victor jr intake manifold, comp cams hydrualic flat tappet camshaft (305 dur .525 .525 lift) comp cams lifters, timing chain, pushrods and rollder rockers (1.6 ratio) edelbrock 750 cfm carb, gm performance HEI distributor and coil, and 11mm taylor plug wires, and melling high volume oil pump, do you guys think this is a good engine combo, and if so how much hp and torque do you think it will make, ps going to have a built 350 turno trans and 4.10 gears (will see limited street use)
Looks okay to me, only I wouldn`t use aluminum rods, I would go with a good set of forged rods. aluminum rods stretch so clearences have to be more, such as quench distance and etc. they also tend to work harden after time and are prone to breakage.
You can't use aluminum rods on the street, they stretch in 500 miles. Then come apart. You need to swap meet those and get a set of Eagle Sir rods.
Well there is one set of aluminum rods that will run on the street but at $1200 a set you don't need them. Everything else looks fine. Should make a good 370ish horse.
The quench clearance that you will need, (I think it is .060"), will be too much for the compression you plan to run. I think you will have detonation problems. With a regular forged rod, and the tighter clearance possible I think you will be okay.
That's funny - your combo is close to mine( still building it ). You should be over 400hp with those heads and that manifold - about 450hp or more. 10.5 to 1 is too low for that cam. You'll never see its peek performance - go with 11.5 to 1 for that cam. Just make sure you have a quench of about .040. If the piston have a stock pin height, you could mill the block down to .012 and run GM's performance .028 gasket. Aluminum heads, that cam, and a tight quench should have no problem running 92-93 octance gas on 11.5 to 1 compression. And that should bring you into the 475-500hp range.
Also, why not use comps CS306s-10 cam - a solid lift cam would be better. Your peek HP will be around 7500rpm with that cam duration. Depending on the weight of the car and tire height with tham cam, you might want to step up to 4.56 or 4.88 gears.
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