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360CID Small Block Chevy.
Initially intended to simply freshen up the existing 305CID Small Block which was getting rather smokey due to 'Shagged' out Valve Guides. However, after coming across a set of reasonably priced BowTie heads, I decided a 350 build was on the cards...
1: High Torque - Redline of 5000RPM.
2: High Reliability.
3: Must run on Pump Gas.
4: Fit within Budget constraints!
|I got an already prepped 0.060" 1986 4 Bolt GM Crate Block from a mate of mine who owned a speed shop in town. GM part number is 10066036, This block was cast in Mexico and was removed from a smashed up Corvette. The Block had been Hot Tanked, Bored 0.060" and Frost Plugs fitted. I was a little nervous about running a Block bored out this far but it also came with a matching Crank and a set of Zollner Pistons. I measured the Cylinder walls and got a minimum of 0.120". Oil Pump installed is a Melling High Vollume/Std pressure pump on an ARP stud mount. Fitted a set of ARP Main Studs and the usual opening up of the top oil return holes and general sharp edge removal was performed along with a Grey paint job.|
Pistons used are Zollner high Silicon flat tops with valve reliefs and measured 0.0015" Bore clerarance. Rings are Sealed Power with Chrome Molley top ring. Ring end gaps were 0.014" top and 0.012" second. I picked up a set of Shot Peined reconditioned GM X-Rods which I fitted with ARP bolts and balanced to 228.2Grams plus or minus 0.1Grams. Crank is a stock cast GM 3932442 with 0.020" under Mains and 0.010" under Big End Journals, Bearings used were Clevite 77 . Crank balanced by Colliers in Levin.
|Camshaft selected was a Melling Torque Cam, MTC-1. This is a farely inexpensive Camshaft which produces good torque and power below 5000RPM. Specifications Below...|
One of my main objecives with this build was to keep the basic character of the vehicle. i.e: A strong motor with a redline of around 5000RPM. The Dyno2003 chart on the left is an estimate of Power/Torque output based on a calculated compression ratio of 9.87 to 1 and non Fuel Injected. This Camshaft fits the criteria well! A Nylon Cam Button and Aluminium Timing cover were used to prevent Cam Walk. Timing set is Cloyes Dual Roller Link.
Actual measured timing from Dial-In during Camshaft install...
@0.006" lift - IVO:24BTC, IVC:66ABC, EVO:72BBC, EVC:32ATC.
@0.050" lift - IVO:5ATC, IVC:28ABC, EVO:44BBC, EVC:10BTC.
|Heads are GM BowTie Phase-II, 14011034. These heads are rated off road use only and offer 184cc runners and were measured at 62cc chambers. Valves used were stainless 2.02" intake and 1.6" exhaust. Guides were Bronze sleeved. 110lb Valve Springs, with an installed height of 1.70", were fitted and these were HPC coated to prevent tempering over extended use. Hardened seats were installed on the exhaust side and the heads were finished with a port and polish. Head bolts are 12 point rated at 170,000lb.|
|Push Rods used are stock length 7.8" Chrome Molley. 3/8" screw in studs and guide plates were fitted along with a set of Comp Cams Magnum roller tip Rockers. In order to increase valve lift I used the larger ratio 1.6 to 1 rockers (0.450" Intake and 0.474" Exhaust). Rocker geometry was checked and found to be bang on. The rockers are held in place with a set of Comp Cams Magnum Polylocks.|
|Initially fitted with an Edelbrock Performer Intake Manifold and Holley 650CFM Double Pumper. The new motor was installed, run in and used as a daily driver for some time before Fuel Injection was fitted. The motor exhibits extremely nice Street Manners and produces fast, smooth exceleration. Top end was around 4500RPM with the Carby and Dual Plane Intake setup. This later increased to 5000RPM with the addition of Fuel Injection and the Holley Street Master Single Plane Intake with no noticeable loss in low end torque. The combination of components used seems to work well with good vacuum and plenty of go. Fastest speed to date is 130MPH and she still had more!|