i am thinking about the 305HO heads used, they seem like a good bang for the buck, and replace them in a few years, i have an 80 L48, i found these what do you think.

305 HO heads cut for 1.94/1.50 valves and bowls blended , $350 outright complete ready to bolt on

or these

305 HO heads $125 used pair ..$250 rebuilt outright

what do you guys think, what would i want..

any help please

 

The bigest thing they will do for you is increase your Comp ratio. They could increase you low end torque because of the slow flow rates you will have peak hp near 5000rpm.

 

Both sound like good deals.
I would go for the first, I think. Then get a die grinder and gasket match the ports.

I'm seriously thinking about some of these for my L48.
What is the resulting CR - was it 9.5:1 ?

:seeya

 

yeah compression should go up a full point, i think the $350s sound good, they have a bigger intake and are almost ported and polished, wouldn't that make some bigger numbers and handle a bigger intake and carb

 

these heads help alot! but I am septical about the valve sizes you state I belive the small combustion limits valve to the 305 mid size of 1:86 but the added comp. raito helps more than the small valves hurt and thats the voice
of experance :thumbs:

 

would a torker intake be to big for these heads, i am worried about the intake valves

 

I think the 'blended bowls' means that the area under the valve is opened
up slightly to 'blend' in smoothly at the edge of the valve seats. I would doubt
that they have been 'ported and polished' to any degree - but you may get lucky there.

So, you're going with heads (and cam) - and keeping the Torker ?
I'm very curious to find how it all works out.
:seeya

 

i figure i will try doing my exhaust, these heads, and a high cam with the torker, i run my engine really high now, i readline constantly pretty everyday, so i think it suits my style, if it is bad i will change to a performer,
my engine has 130k but it loves the high rpms, i ran on the Mass pike for a half hour averaging 120+mph and it was smooth

 

It seems like you have some mismatched componants. If you are going to be using 305 heads then you are building a motor for torque and bottom-end power. I would not go with a larger cam and I would definitely get rid of the torker intake. I wouldn't go too "high" with the cam, because with those heads you aren't going to see much (if any) performance increase all you'll do is lose bottom-end. I would go with a nice dual plane intake manifold like a Weiand Stealth or something to that effect.

Good luck.

 

Have you run a compression check on your engine? You need to be sure the bottom end is going to take the added stress...

 

Am assuming the 305ci heads have a combustion chamber near 58cc's. That said, I'd go with a hi-po 350 head that has equivalent cc volume if that is what you are looking for. With the hi-po 350 heads (most reconditioned 350 heads are about $350-400) you also get better intake/exhaust port flows AND are better matched to that Torker intake and bigger cam.

Just my $.02. If you like to live life on the red-line, I think those 305's are going to run out of steam sooner than you are accustomed.

 

I agree with Ted. While the 305 head's smaller chambers will increase your cr, everything else about them would likely negate that gain in power. You might consider the L98/ZZ4/ZZ3 heads if you're looking for a less expensive alternative to new heads. Lot's of those heads have been replaced by after-market heads and are out there at reasonable prices. Besides their weight advantage, they also have 58cc chambers that will raise your cr but, unlike the 305 heads, they were designed for your 4" bore and flow much better. You might also consider the Vortec heads, especially if a new intake manifold is in your car's future anyway.

Scorciae, I can appreciate that you're looking for an improvement without breaking the bank but hp does cost money. It's "false economy" to spend less money for something that doesn't deliver what you want than to soend more money for something that does. Also keep in mind that there are other costs involved in replacing your heads (plus your labor). Mostly in gaskets but also new head bolts if they haven't already been replaced recently. Those "other" costs and your labor are the same whether you put on crummy heads or the best ones. To me, paying more for something for something I want, rather than paying less for something I'm not going to be satisfied with, is well worth the investment. If I can't afford what I want now, I'll wait until I can afford it rather than spend money on something I won't be satisfied with will want to replace later anyway.