Hey guys my friend is parting out his 350 that has a set of world product sr's on it, they have about 500miles on the, but he spoon his crank bearing so he is willing to sell them to me for 300$... Could i use these heads if i mill them down to 55-58cc get them cleaned up and all???? Sounds like a gr8 deal, dont want to miss it. Hope they work and you all give me some good news

 

yes if they are 87 and up heads they will bolt on perfect just need to mill them down to stock cc or lower for high comp.if they are vortec heads get a vortec manifold so no matter what they will fit perfect and you gain some ponies ok

 

Those valve are to big for a 305 and you will not get the same results with heads with a 1.94 and 1.55 valves. That 2.02 valve is huge and you are blocking air from entering effeciently on one side of the valve. It is to close to the cylinder wall and with cause shrouding. They will work and be better than the LO3 heads, don't get me wrong here. But you would make more power with a smaller valve. Now if you plan on going to a 350 later, then I would buy them and not use them (so you can keep the 64cc chambers), put some money into a port job and good springs and what not, and use them on a better motor. but to answer your question, they will work.

 

Based on my experience, 2.02 valves are really a bad choice even for a (335) stroked 305. Stick to 1.84 or 1.94max valve size 170cc for 305's. I know that I lost plenty of low end power with 2.02-1.06 200cc heads on my car not to mention that is wasn't burning the fuel properly, do not make the same mistake I did.

Later.

 

But I can get the heads for 300$ im not sure it there the s/r's, or the s/r torquers... Im hoping there the s/rs cuz then there 1.94, 1.60 and i can have them milled to work excellent, if there the 2.02 1.60's i wont pick them up, i gotta call summit and see which set he picked up

 

Well, the price is right.. so u dont loose by getting them.
Thing is.. for a 305.. its not a really good choice due to the
small cylinders...

And as specialy if u have them milled, theyll be even closer
to the cylinder wall.

Keep them for the next buildup.

 

but the engine has only 10k on this rebuild, just i didnt do anything to my heads, and my valve seals are gone, so i figured i could just use these..

 

Buy them, use them. The 2.02/1.60 aren't effectively shrouded until lifts beyond .550" with a 64cc chamber. Are you running a higher lift than that?

 

No max lift would be 488 with 1.6 rocker arms. The springs are bad on the heads I found out so I would be replacing them with stronger springs... But max lift will not exceed 488

 

Then you will have no concerns with valve shrouding or any type of flow issues.

 

YES!!!!!! THANX GUYS!!!! YAY!!! World Product Heads Kick A$$!!! Port Polish Milling here I come.. 55cc should good for milling them?

 

55cc is awful small. You would have to run some low compression pistons with those. Stock 305's are 58cc and most 350's are 64 cc.

 

so then should i mill it to 58cc???? what would be a good mill cc?

 

58 cc is good for a 305 but may be a bit to small if you plan on using them on a 350 in the future. You can always go a little bigger and make up the difference in head gasket thickness.

 

Shifty I dont plain on going to a 350 with this car... Im trying to get my 305 to keep up with stock lt1s. I do have a 350 I am going to be building to put in a camaro in the near future, but I will be using Trick Flows on that engine with forged low compression pistons, so i can run boost.

 

55cc will work fine. That would put you at almost 10:1 compression ratio on a 305 with flat top pistons (with valve reliefs). You should consider milling the intake manifold as well.

 

Since you are keeping the 305 than that should work. Especially if you use low compression forged units. I would also look inot getting the manifold machined as well. You don't want any clearance issues and you want the intake ports to line up to the heads just right.

 

This may sound stupied but does my 89 roller block have flat top pistons, and is 10:1 comp to much to run on pump gas???? My intake wont much up if i get the heads milled??? I dont follow, sorry if i sound like a re-re right now

 

10:1 is not to much for pump gas with iron heads. You will have to use premium though. You can go a little higher for an iron head but I would stay at that to keep things simple in case you get bad gas and to avoid using octane boost. LT1's have 10.25:1 and LS1's have 10.5:1 however that is with an aluminum head which can take a lot more compression on pump gas before detonation.

 

Should have flat tops (with valve reliefs).

10:1 should be ok on pump gas. I know quite a few people doing it around here with iron heads.

The intake manifold will match up but you will be losing flow since there will be an overlap between the top and bottom intake ports.

 

you will be fine on 10:1 compression ratio. Just make sure to run premium gas to keep detonation down. BTW, the LS1 has 10.0:1 compression, not 10.5:1. I had mine milled 30 thousandths to achieve 10.8 to 1 compression ratio and all is good in the world, lol.

 

Ok kewl gonna go down to 55cc and port the intake the match the heads. should be all chicken and gravy :-) now i need some1 to vist me and tune it, lol

 

I just double checked my literature and you are correct. Actually the LS1 is 10.1:1 and the LT1 is 10.5:1. But you were right on the LS1. I got all messed up. Thanks for setting my facts straight

 

Well after doing some research I found out the heads World Products Sportsman II Heads. I got them for 300$. with 200miles on them

Chevrolet: 302/327/350/400, for 1987 and later intakes, 72cc combustion chamber, straight plug, 1.250 in. single valve springs, assembled, head

This head has high-flow 200cc intake runners with smooth tapered shapes to maximize low-end torque, plus a heart-shaped design at the entrance of the combustion chambers to swirl the air/fuel mixture throughout the chamber. It includes Manley stainless steel valves, 1.250 in. valve springs, retainers, locks, umbrella-style valve seals, screw-in studs, and pushrod guideplates.

I have a 305 what should I do HELP!!!!!!!!!

 

Justin,

I am not sure how much you can mill them. Most people mill 64cc chamber heads. If you can, see if you can mill them to 60cc to 64 cc. You can make up the difference in new pistons if you have to. You will have to machine the intake as well to make the intake ports line up right.

 

That's rough. Even though they're aftermarket heads I still don't think there will be enough meat on them to mill them down to 64cc even. Only solution here is to get a 400 sbc or sell the heads.

 

accoring to world products website it says apporx
Machine Shop Specifications:
Maximum valve diameter: 2.100” x 1.600” or 2.080” x 1.625”
Maximum spring seat depth (from inside step): .030”
Maximum spring diameter: 1.550”
Approximate milling guideline (varies with depth): .0065” per cc
Maximum flat mill depth (up to intake seats): .040”
Maximum angle mill (approx. 50-52cc volume): .175” depth

if that means anything