Another head poll

[tacoma man.]

Originally Posted by DiabloGT

lol! which hoe is the best? i think amanda is!

Hey now, amanda is my girlfriend and she's not a HO! not yet any way.

[351wStang]

You looked into AFR's? Awsome flow numbers.

[Genopsyde]

No I haven't, but I will now, thx.

[351wStang]

www.airflowresearch.com

[89IROC&RS]

. I have vortec 906 castings


dude, just checking, but you know those are the less desireable castings right??? do not try to enlarge valve seats, and use a dual pattern cam with a little more lift and/or durration on the exhaust side to compensate for its lesser air flow. the desireable vortec castings are the 062 castings found on R code engine equipped CK trucks. just a sidenote to the conversation.

[4onFloor]

Originally Posted by instantkevin

305 heads on a 350 is not a good idea anyway. They are not made to accomodate the larger displacement.

305 valves handle the displacement of a mild 350 just fine. the only drawback is there designed smaller bores, so you get overhang into the cylinder area, but an hour with a grinder and problem solved. plus the 58cc jumps the compression a little compared to the 64cc 350 heads.

now 350 heads on a 305 is well...like a 36 inch dildo....kinda pointless. unless you've got a blower

[Genopsyde]

why is everyone voting for the vortec heads then if everyone realizes that they'll be bad on a 305?

[Genopsyde]

remember, i'm keeping the 305, i'm not swapping in a 350.

[mike123]

yea i got some vortec 906's i gota sell , cause i need money for a another camaro.

[89IROC&RS]

actually, the vortec heads will be AWESOME on a 305. so long as you keep the small valve sizes. you can either mill down the heads for smaller chambers, or run a small dome on the pistons, or a steel shim gasket, its very doable. the small valves will work great with the 305 bore x stroke ratio because the 305 is designed for low rpms, and the small valve ports on the heads will have great flow and high port velocities at low rpms, so youll have pretty stout torque from idle - 4500 rpms, which is what gets these cars movin in the first place. so once you handle the compression issue, you can get a nice balance of both worlds, the torquer SR heads will make great low end power, but the vortecs will extend your power band up a few hundred more rpms. so you could probly still run the 906 heads on a 305 seeing as you have to keep the small valve sizes to clear the bores. but some mild port work, three angle valve job, and some manley street flo valves would really make the heads flow some air. and still have high port velocity for better atomization of the air/fuel ratio.

[Genopsyde]

ok, which would require less work, cuz i'm lazy?

[Genopsyde]

ok, i guess i'll get the vortecs, but I know shit about porting and polishing, and 3-angle valve jobs, is there a how-to anywhere online?

[mike123]

wanna buy my heads lol they've been siting in my garge for so long and i want something else

[instantkevin]

89IROC how do you like those 906 castings? I got mine from a pretty good company off eBay. completely redone, new springs, valves, 5-angle job, etc. Didn't find out about the downside to the 906's till after I bought them. Now I'm not sure if I want to put them on my engine. Everything this on this engine is going to be for super street performance, and I'm not sure how much these heads will set me back. What do you think about them? got any power numbers and/or specs? I've read in a couple places that these castings don't affect power too much.

[Genopsyde]

Mike123, I probably would, but last time I tried to buy something from someone here, i sent the money and never recieved the item. It wasn't cheap either.