i have got a 305 z./28 stocker,,duel snorkel intake 4 bbl ,,i just bought a ISKY 262 cam ,435lift,262 duration 0;50@ 208 dur,,(small one),i intend swaping the heads and the intake,,,,i need usable power 1500<5500, what is the story on the heads,,,i been out of this stuff for years,,,i want to keep it relativly lo comp,,,,and can get excess to a head shop to get porting done,,,which is the best stock head to start work on,,,1982 z/28 305,,,and will they have markings on them like the old fuellie,,heads,,or whatnot,,

 

If you want to get different heads I would get the Wold Products 305 heads, I've heard good things about them. Also the Vortec heads that GM makes flow well but you would need to buy a special intake for them. Most aftermarket heads are designed for the larger bore of a 350 or other engines and won't work well on a 305.
You also might want to look into working with your stock heads, I've had success with that. I had my heads ported, 3angle valve job, the bowls blended, and they are milled for more compression. I've managed to get my 305 down to a 13.4sec 1/4 mile with the stock bottom end with the mods in my signature.

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best 1/4 mile so far: 13.4 @ 101mph

84 Camaro 305 ported & milled heads, 3 angle valve job, Edelbrock Performer RPM intake, Hedman full length headers, Accell ignition, Crane 274H cam, B&M 700R-4, 3000 stall speed, 4.10 gear,
M/T ET street tires
visit my website at http://www.geocities.com/jbenge/page1.html

 

JBENGE, with that cam how did your streatability react? Can you still drive the car daily and does it burn gas like a ****?
Your setup looks great and I'd love to get down into the 13's. How much did it cost to do the head work?
Thanks

Steve

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89 GTA G92
305 TPI WC 5spd w/3.45
Accel Cap & 8mm Taylor's
Custom 4" Cold Air Induction
Jet Airfoil
K&N Airfilter
160 deg stat/fan switch TB Bypass - Steel Rad
Cat back 3" Exhaust w/Terminator Muff.
HiGh FlOw Dynomax Cat
Spohn LCA's - KYB GR-2's
Moroso Crank Bolt and roller pilot bearing.
New Fuel Pump!
Autometer Vac+Oil Temp
2000 Yamaha R1 150hp 385ibs

 

The cam in combination with the 4.10 gear makes the car drink gas so I wouldn't recommend it for a daily driver but besides that its very reliable and streetable. The head work cost about $250 plus another $80 because I had the exhaust valves replaced with better flowing aftermarket ones. I had the heads tested on a flow bench before and after the work, it made a huge difference. And when I put the heads on the car I could definately tell a difference in throttle response so it was definately worth the effort.

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best 1/4 mile so far: 13.4 @ 101mph

84 Camaro 305 ported & milled heads, 3 angle valve job, Edelbrock Performer RPM intake, Hedman full length headers, Accell ignition, Crane 274H cam, B&M 700R-4, 3000 stall speed, 4.10 gear,
M/T ET street tires
visit my website at http://www.geocities.com/jbenge/page1.html

 

What else was done to the heads ? Did you change valve sizes? What was the CR after the milling? 13.4 1/4 with a 305 I WANT THAT!!!!!!


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Original owner 1987 Iroc
Stock but not for long

 

I have the Vortec heads on the 305 I am building and other than milling them down to get the CR. I would recomend them to anybody and the valve size works well with the 305.

Brian

 

Do the WP heads. I ported my own 305 heads, and spent $460 on getting them reworked. I ended up running 101 MPH as well, but I dont think I have the correct torque converter. THe motor is a bit shy on torque below 3000 RPM, and my 60-foot times are still 2.05 to 2.1 seconds with virtually zero wheelspin.

I have many, many details about it on my website.
http://www.isthq.com/~dan/fcar.html


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Daniel Burk
http://www.isthq.com/~dan/fcar.html
'84 Trans Am WS6/L69
KB SFC, Moser axles, Torsen Diff., Spohn Adj. torque arm,
Ported 305 heads w/1.94"intake valves, Comp Cams XE262H, Griffen alum. radiator,
Turbine Technologies 2500 stall converter, underdrive pulleys, Crane Hi-6 & more.
1.05g skidpad verified.
Best of 14.039 at 100.82 MPH in Stanton, MI
New! 275-40-ZR17 tires on ROH ZS 17 x 9.5's