sbc heads

[84silverado]

well i finally got that problem solved hehe my dad gave me the edelbrock of his project '79 K10..i had 2 holleys on it before that and no matter what i just could keep the fuel to it when i got on it but now with that edelbrock i have no problem what so ever 

[J.C.]

if the fuel/air cant get thru the valves into the chamber, it doesnt matter what kind of carb ya got...

[84silverado]

im just saying though cause with what i got now ive never had a problem getting fuel anywhere...atleast not yet that is

[old school truck dude]

im just saying though cause with what i got now ive never had a problem getting fuel anywhere...atleast not yet that is

You might not be understanding what we are trying to tell you here. Go out side and turn on the water hose. Water flows freely out the end. Now take a pair of needlenose pliers and squeeze down on the hose about middleways. The flow slows down. The pliers represent the small valves that are in those 305 heads. The valves are too small to allow good flow. Youre better off using heads with larger valves and less compression. High compression is great but only if you can get the fuel in and back out of the chamber. Unless you cut the seats out of the 305 head and install larger valves, youre wasting your efforts in the search for better performance. 305 heads were intended to be used for better gas mileage, not better performance. The 305 comes with dish pistons to create a better burn. The compression ratio ends up being just as low as any other typical stock engine of this era. Many people tend to think that because the chamber is smaller it makes better performance but it doesnt, its a trade-off.

[Jjay78]

it isn't cheep to have better valves installed either, for what you'll end up spending hot tanking, crack testing having the seats re cut, blending the bowls and buying the new valves you can buy a set of new heads with what you want

[84silverado]

well i bought it that way so i guess the guy before me thought it would help him. but thanks for the mental image for understanding what it is, i gotcha now, thanks. hey i know this might be another stupid question but would my 327 heads be better? cause i really dont wanna go get the ones worked if my 327 ones would work better

[old school truck dude]

well i bought it that way so i guess the guy before me thought it would help him. but thanks for the mental image for understanding what it is, i gotcha now, thanks. hey i know this might be another stupid question but would my 327 heads be better? cause i really dont wanna go get the ones worked if my 327 ones would work better

Yup. Whats the casting number?

[Jjay78]

the 327's were intended as performance motors, more than likely yes they will be really good heads, but it depends on what numbers they are

[84silverado]

the number i found was 3884520 on them

[Jjay78]

they come up as general use on 283's and 327's  from 1960 to 1967 particluar mentions of teh chevelle, nove trucks and corvettes, small intake valve and a 1.5 exhaust valve, if they are the vette 327 heads the motor was factory rated a 250 hp...

[84silverado]

my dad will know more about them cause they are his and he told me last year when i first got my rig that i could use them if i wanted to so he knows more about them so ill ask when he gets home from work tonite. but still even if they were just regular 327 heads they would still work better than my 305s

[Jjay78]

yes, they were intended for a 4 inch bore performance motor when gas mileage wasn't even in common voculabery use

[84silverado]

well i know what heads im putting back on when i go through my motor this winter

[old school truck dude]

it isn't cheep to have better valves installed either, for what you'll end up spending hot tanking, crack testing having the seats re cut, blending the bowls and buying the new valves you can buy a set of new heads with what you want

It can be done on a good drill press with a relatively inexpensive adjustable bit. Pound in the new hardened seat, stake it and polish around in there some, grind and lap in the valve and seat. Get valves outta busted heads and mic the stems no big deal.. lotsa work but not much money and makes a fair head. Still wont have very good runners, though. Oh well.. Also, let me say this right here: TAKE THE HEADS AND HAVE THEM MAGNAFUXED AND THE GUIDES MEASURED. If the guides are wore out, the heads are not really worth fixin, its alot for 16 guides and havin them installed. The valves will be floppin around and not makin a good seal, so they will BURN quickly, and oil will get burnt too.

[84silverado]

hmmm i might just do that if my funds stay the same. cause thats a good idea and i might go with it, thanks man  but i was also thinking if the other job im starting tommorow at mcdonalds goes alrite i was gunna save up and build a 383 stroker motor and run that when my motor now dies lol

[Yankee Hick]

im just saying though cause with what i got now ive never had a problem getting fuel anywhere...atleast not yet that is

You might not be understanding what we are trying to tell you here. Go out side and turn on the water hose. Water flows freely out the end. Now take a pair of needlenose pliers and squeeze down on the hose about middleways. The flow slows down. The pliers represent the small valves that are in those 305 heads. The valves are too small to allow good flow. Youre better off using heads with larger valves and less compression. High compression is great but only if you can get the fuel in and back out of the chamber. Unless you cut the seats out of the 305 head and install larger valves, youre wasting your efforts in the search for better performance. 305 heads were intended to be used for better gas mileage, not better performance. The 305 comes with dish pistons to create a better burn. The compression ratio ends up being just as low as any other typical stock engine of this era. Many people tend to think that because the chamber is smaller it makes better performance but it doesnt, its a trade-off.

damnit..... i just sprayed myself.  lol.

[Ranger Dave]

motors are air chambers.  the more you can get in and out the better.  then add spark and fuel.

just like they stated above.

[old school truck dude]

im just saying though cause with what i got now ive never had a problem getting fuel anywhere...atleast not yet that is

You might not be understanding what we are trying to tell you here. Go out side and turn on the water hose. Water flows freely out the end. Now take a pair of needlenose pliers and squeeze down on the hose about middleways. The flow slows down. The pliers represent the small valves that are in those 305 heads. The valves are too small to allow good flow. Youre better off using heads with larger valves and less compression. High compression is great but only if you can get the fuel in and back out of the chamber. Unless you cut the seats out of the 305 head and install larger valves, youre wasting your efforts in the search for better performance. 305 heads were intended to be used for better gas mileage, not better performance. The 305 comes with dish pistons to create a better burn. The compression ratio ends up being just as low as any other typical stock engine of this era. Many people tend to think that because the chamber is smaller it makes better performance but it doesnt, its a trade-off.

damnit..... i just sprayed myself.  lol.