Valve springs are also VERY important due to the stock ones having a redline of 4500 rpm. I got those specs right off the Jegs website selling the new GM replacement TBI crate engines. 050″ tappet lift (intake/exhaust) is 165/175 and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is. The cam in the TBI engine is just plain AWFUL. 750 reach plugs now so check that out when you order your heads.Ĥ. Some of the aftermarket iron heads take the. 750 reach plugs for vortec heads and aluminum heads. For plugs AC Delco again seems to give me the best plug coloring. Too many issues with the MSD and Accel coils to recommend them lately. If your going to rev her on up then I recommend a Pertronix D3002. For coil, up to 4500 rpms stock coil just fine.
I like the Accel 5114K as they are not only nice low resistance wire but the outer casing of the wire is tougher than any other wire I have used and the price isn’t bad. For flat tappet cams, I recommend the Davis Unified 12620bk then for Plug wires, if your running a stock engine then stock replacement wires are typically fine but any decent peformance engine USE A BETTER WIRE. For roller cam engines use a new best brand distributor you can get at your local autoparts store for a 1992 Camaro 350 TPI Z28 which also uses a flat tappet camshaft. You just asking for a headache that neither of us need. If your distributor has over 100k miles on it. AC Delco still chinese but have better handle on quality control.
I only use AC Delco electrics as most all others is poor quality chinese parts. you can order those from nearly any auto parts store. First, if the distributor is out for cam swap or engine replacement then change the pickup stator with a new AC Delco D1987 pickup stator. That just makes diagnosis harder and have yet to see any gains on this system from adding one. People either skip this entirely, or skimp on the parts used or go crazy. the Y pipe will add a noticeable amount though and will help support more modifications.I clipped this picture from my latest Hot Rod magazine on choosing the size of your exhaust pipe.ģ.
Pulling cam 350 chevy full#
I have been using a FULL BOAR SS muffler off ebay which are stainless and cheap and flow well but not going to be a huge gain in power. As for headers, not really recommended on engines under 300hp and for muffler, you want an aggressive sound that’s fine pick from several. you can search ebay for THUNDERBOLT 3 CATALYTIC and those high flow cats are like $50. As for the cat, I know most say it should fall off and turn a blind eye but I personally don’t like the smell of the exhaust with no cat and want to do my part towards our environment as well. Dramatic improvement over that stock GM design. To fix 90% of the exhaust issues, I recommend a Flowmaster Y250300 collector from your favorite vendor and replace that section of Y pipe where the 2 pipes merge.
Pulling cam 350 chevy free#
A good free flowing exhaust does typically need a 3 wire heated o2 sensor conversion to maintain its temperature. The reason for the back pressure was so that the EGR smog system would work better and the increased pressure would build up a lot of heat to keep the o2 sensor hot. GM intentionally made that Y pipe restrictive to increase back pressure and most have paid someone to spread a myth that back pressure in the exhaust is GOOD. Well the KEY issues with the exhaust is the Y pipe and the catalytic converter.
Exhaust, You need to start there because doesn’t matter how much you improve the air going in, if you can’t get it out it will run poorly and the stock exhaust is terrible. So I begin every project with a new upgraded pump.Ģ. I recommend upgrading to the 1996 Vortec 155lph fuel pump which can support up to 450hp and plugs right into a factory TBI sending unit. First I start with a new Fuel pump, STOCK 75lph TBI fuel pump will only support about 230hp before the fuel pressure drops like a rock.