Quote:
Originally posted by Excaliber
SB Chevs are not known for good mileage, with the exception being late model factory fuel injection on SOME applications. Generally speaking, the 350 is a dog for mileage.
7.5 should be OK for the street, certainly can run that low octane cheap gas! Loose the blower, get a small carb and forget about performance. I would consider a change in cam profile, look for a low rpm "motor home" or "truck" use application for max torque at low rpm.
If you got a solid roller lifter cam your asking for trouble down the road. The kind of cam is NOT recommended for low rpm or "street" use due to oiling of the roller on the lifter issues. 10K "street" miles is about all you can expect if it's a solid roller. Not to mention that cam is probably WHY your getting such bad mileage.
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Heres jsut a quick rundown on the motor, will have to dig up the notes to get more specific.
350 Racing Head Service SBC with forged crank, 4-bolt block, roller tip rockers, turbo TRW pistons, mild hydraulic cam, Mallory comp 9000 dist, HD
oil pump, headers,
oil cooler, flowmasters, Jacobs ignition box, B&M low profile blower, Holley 800CFM double pumper. New Richmond Gear super T-10 four speed with dual face Centerforce clutch, steel shatter-proof bellhousing. Franklin Grand National quickchange rear-end with Wilwood discs and calipers, gun drilled full floating axles, Torsen gear type posi [extra QC gears and Detroit Locker]. Front brakes are Corvette rotors and calipers with billet aluminum hubs and GM bearings, dual master cylinders with balance bar. Other features: 3 quart Accusump in trunk, gel battery with cut-off switch, Moroso extra capacity
oil pan, Alden coilovers, 4 row radiator, auxiliary elect fan
The plan so far is to pull the blower, put a torqu'y manifold on the 350 and a mild carb. Pull the 3.33's that I think are in the car right now and drop a set of 3.13 or 2.98. (Cheap with the quick change). Soften the Aldan down about 2 notches and see what it gets me. I want to leave the cam thats in the car alone if the specs look right for a daily.
PS
I thought about going the fuel injection route, in fact I even talked to a few "experts" each said for a street car there really is nothing straight off the shelf that going to be able to support 600hp. 450 or so looks like the upper limit. This is mainly due to the fact that I have to run a carb like setup on top of my blower.