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Old 04-22-2012, 10:51 AM
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chevy heads 3970126 , worth my money ?

i have a buddy that has a set of heads for sale for 560 bucks and i was thinking id put them on my 327 build .the casting number is 3970126 and i was wondering if they are worth buying and what i can expect from them (performance, what gas i can burn etc). they have been changed into 2.020/1.60's . they have also had porting done, checked for cracks, checked for flat, new valve springs,new valves, new valve seals and a nice orange paint job . tell me your thoughts as this is my first build. i also need to run my P/S and alternator, but i think all the holes are there for that... ? . and lastly (at risk of being told to buy a honda) what will the bigger valves do to my gas milage .. ive been told it will be better (because they are less restricting) , worse (because of bigger valves) and the same by a few people , just wanted to clear that up! thanks for any help i can get !

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Old 04-22-2012, 03:07 PM
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The fancy paint doesn't make up for the fact that they are stock passenger production heads. Large old 13/16 spark plug. They are also not compatible with modern fuel.
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Old 04-22-2012, 08:50 PM
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Ohh really ? Hmm now why is that ? unleaded fuel or something ?
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Old 04-23-2012, 03:54 AM
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I dont see how they wouldnt be compatible with todays fuel.... If theyve been machined for bigger valves and had all that work done, you can be sure theyd have put hardened seats in, however even if they didnt you will have no problem running those heads as it doesnt make much of a difference. BUT, for that kind of money, your better off picking up a set of world sr torquers, or even a set of vortec heads and intake if you dont mind not looking original, both will greatly outflow those old castings for the money.
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Old 04-23-2012, 05:26 AM
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Ive picked up vortecs ... 4 times ... all of them cracked aswell so im kind of turnd off of them haha can anyone answer any of the other questions i had
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Old 04-23-2012, 08:50 AM
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If you still have the moving parts and the intake from the cracked vortecs you could buy bare castings from enginequest and save a few bucks. It's not just about flow, the vortec chambers are way better than anything from the 60's. You can run a little more compression and use a little less spark advance.
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