TBIThrottle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.
Welcome to ThirdGen.org!
Welcome to ThirdGen.org.
You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!
Generally 350 heads have 62-64cc combustion chambers as opposed to 58cc (although some aluminium heads for 350s are lower) that the 305 comes with. Plus the 5.7 heads generally come with 2.02 intake valves which you dont see on 305s too often (but they do work!). They'll bolt up fine though, and work ever better if you have them milled to decrease compression
Originally posted by Chuck! Generally 350 heads have 62-64cc combustion chambers as opposed to 58cc (although some aluminium heads for 350s are lower) that the 305 comes with. Plus the 5.7 heads generally come with 2.02 intake valves which you dont see on 305s too often (but they do work!). They'll bolt up fine though, and work ever better if you have them milled to decrease compression
You mean increase compression, don'tcha?
__________________ 89 Camaro RS Convertible Purchased 8/90, Guards Red w/ Red Pearl Ghost Flames, 4 Bolt Main 350 Torque-plate Bored + .030, Flat Top Hypereutectic Pistons, Align Honed Block, Forged Crank, Windage Tray and Crank Scraper, SpeedPro roller cam 210/215 Dur .462/.470 Lift, Edelbrock Performer Intake, TBI, Edelbrock TES headers, Dynomax Hi-Flow Cat, Flowmaster Exhaust, Ed Wright custom chip, MSD Super 8.5 mm wires, 160* thermostat, Goodyear Hi-Miler Blue Hoses, K & N X-stream Open Element, 305HP 360 ft-lbs, 'Glass Cowl Induction Hood, Spohn SFCs, 4th Gen Seats, Grant Evolution GT Steering Wheel, Alpine Stereo w/ Infinty & Polk speakers, 700R4 with TransPak and Corvette servo, 2000 RPM Stall TC, 2.73 10 bolt posi-rear
Pics @ http://www.thirdgen.org/techbb2/showthread.php?s=&threadid=165810&highlight=deemax
Typical 305 heads have 1.75/1.5 valves.
350's have 1.75/1.5 , 1.94/1.5, or even 2.02/1.6 valves.
For the most part the 1.94/1.5 are sufficient giving excellent throttle responce and power. A 305 won't benefit with the 2.02/1.6 because they are too close to the cylinder walls, therefore ristricting air flow. The 1.94/1.5 will give lots of power on a 305, but harming the throttle response a bit at low rpm.
I suggest not putting 350 heads on a 305 it lowers your compression and does a whole lot extra. Before I put in a L98 cam and heads. I lost ALL my power my car was slow as hell. I had absolutly no low end power (so little that my car bogged off the line) and the top end wasnt even all that great.
I later changed over to monte carlo SS heads (305 motor) and all my power returned...atcually a whole lot more power came with it.
