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Old 06-06-2010, 10:05 AM
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350 Sbc

I have a 350 thats in a 86 K5 Blazer that i am rebuiding, it is not bored and is a 4 bolt main. It has a edelbrock performer intake and 600 carb, the heads were off a 400 small block with 76cc chambers and 1.94/1.50 valves and need extensive repair. I am considering a head change and have my option of '85 305 heads with 1.86/1.5 valves - 58cc chambers and 84 350 heads with 66cc chambers and 1.94/1.5 valves. Just wondering which would be better for my 4wd blazer, i am also adding a mild cam,headers and msd ignition. Any help would be appreciated, thanks

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Old 06-06-2010, 11:30 AM
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sbc 350

How much ring ridge does it have? Are the pistons snug in the holes? Did it run good before tear down? I assume the blazer is 4wd? If so you need your horsepower to start early in the rpm band where it is most beneficial. Your cam should match your CR. And right off hand I would forget the 305 heads, bad flow#s. If you don't absolutely have to bore it, there are benefits to going back std on the bores; Like you don't have to Torque Plate hone. Give us some info and we can offer a build plan to fit you... Duntov
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Old 06-06-2010, 11:49 AM
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the block and bore are fine, already ordered a rebuild lit from summit in std bore complete with new pistons. It was running and had been reringed about 20k miles ago but rear seal was leaking along with every other gasket. So i decided to do a complete overhaul. In running the block and head #'s found that heads were off a 400, and in terrible shape-seats. valves, guides and springs and they were also 76cc chambers which i'm assuming decreased compression... so many people run those 305 heads and those along with a set of standard 350 heads is what i have access to..... it is not a daily driver more of a toy...my mechanic ordered the cam and said it would hit a small lick....i will not be putting the 400 heads back on.... so should i find some more heads or work with what i have access to
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Old 06-06-2010, 12:20 PM
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350 sbc

Recommend to take .020 off the deck, to get a quinch going,... about 50 or 75 dollars around here.+ it up's your cr a good bit. If you ordered flat tops with the kit the 76cc heads aren't that bad, all the 76cc heads flow ok, but I recently bought a new pair off Ebay(bare) for 250ish that outperform most any factory head. 64 cc 170cc intake vortec style chamber. If you got a lumpy sounding cam coming you'll probably need the 64 cc chambers ands the deck job. Any cam that sounds like that will sacrafice early torque though. Someone correct me if I'm wrong??? Duntov
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Old 06-06-2010, 12:57 PM
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the 305 heads will give you around 10.4 CR, with the 76cc you will have 9 to 1 CR, the 305 H.O heads arnt bad, but like i said the CR will be on up there, like 93 octan, fine some 441's or 882's, you could even have them milled down if you want, depinding on what CR you want?? Whats the Grind on the cam that you getting??? Wev run the 305 H.O heads on 350's alot they arnt to bad, we had a 355 with 305 heads pushing 13 to1 CR, and it was real good for a race engine with 305 heads with a port job done!!!
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Old 06-06-2010, 01:06 PM
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305 ho heads

Haven't seen flow numbers on the HO heads. How do they compare to 993s for example? I think I got rid of the only ho 305 I had. Was from a 91 Formula w TPI. I bet I messed up. Duntov
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Old 06-06-2010, 01:20 PM
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"4416"# 305 H.O. heads, unknown on the flow, but they are the best of the 305 heads, we currently have them on a .60 over 350 with FT pistons, a good cam 222/222 with 465"/465" copy of the ''ole corvette'' cam.. and let me tell you in a 76' custom deluxe LWB with 31 inch tires it with smoke them like crazy....
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Old 06-06-2010, 01:36 PM
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4416s

Sounds like they're good for the bottom end torque. Typical of smaller intake valves. Still got the 1.88"s?
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Old 06-06-2010, 02:34 PM
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yes if you are going to use 305 heads only use the 4416 heads these are the only ones that flow worth a darn, and on a 350 that wont see over 4500-5000rpm they will do just fine especially if you have the money to get them cleaned up a bit. what rebuilt kit did you get, most stock rebuilder kits that a machine shop will order for you have a lower compression height on the pistons (std 350= 1.560", rebuilder pistons=1.540" a difference of .020") so you will want to find out exaclty what the machinest ordered. second is that i would not go with 882 heads or any other 76cc smogger head. since they are flat tops then look for a set of aftermarket 72cc heads or even a set of world 76cc SS heads you will find your self much happer with these. for the pistons you have now the 305 heads are going to put your compression up to high and i think that even a set of 64cc heads will likely be a little high for the cam you picked, when a machinest says a little lick i would guess he means like 205-210 @ 050 i doubt he ordered anything above 215
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Old 06-06-2010, 06:55 PM
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thanks every1 i will let you in on more details as i get them
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Old 06-11-2010, 09:30 AM
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Still looking

So my rebuild is at a stand still...still haven't found any 350 heads worth rebuilding, and since i had already bought a set of ss valves i'd really like to find some i can use them on.... lots of heads were scrapped around here when scrap metal got so high a few years ago, they're not just laying around waiting to be rebuilt anymore.... anyone have any heads with 1.94/1.5 valves and around 66cc chambers that wants to turn loose of them i am in the market, remembering that i am on a budgeted rebuild thanks
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Old 06-11-2010, 09:39 AM
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350

Heads aren't hard to get. Metal went up and still is up and a lot of heads are scrapped every day, but the desirable #s are probably surviving fairly well. I have some notes in in my casting number books in the shop on where the best deals are and I'll check it out tonight and post. What part of the country are you in? There is a local core supply here that is reasonable here but shipping kills the deal on iron heads for me.
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Old 06-11-2010, 11:01 AM
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Dude, have you ever heard of ebay? There's a pair of 462 heads, 041 heads, 461 heads up for bid. These are your famous double hump heads. The 041 heads will have accessory bolt holes drilled in them.
Chevy cylinder heads are EVERYWHERE. What do you care if the heads are old and need refreshing? You said you have new valves you want to put in them so as long as they don't have cracks you can rebuild them to your specs.

Oh, and short answer to your question: 350 heads are better than 305 heads for your 350 engine.
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Old 06-11-2010, 11:31 AM
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all the heads i've found online are either too expensive, or the shipping is nuts.... and who knows what you are really getting.....remember guys, this is a budgeted build...thanks for the suggestions though... I am in middle tennessee if anyone close has some....
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Old 06-11-2010, 12:17 PM
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1.21 giga-watts???!!!!
 
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Soooooooo.....if you win a bid for a pair of heads say for $150 bucks then you have to pay $60 bucks for shipping, that $210 bucks will break your budget? If so, son, you don't have a budget. Screw the motor back together stock and save up your pennies.
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