Can you put 350 heads on a 327 block? The block had double hump 327 heads----They got taken off and sold. Can 350 heads be put on that engine?
Bill Your question seems a bit generic, but if you are serious, yes, same basic heads. First 350 was in a 67 Camaro SS (only), most 67 Chevys with 327's used a couple different variations. Casting number and valve dia. to match the horsepower rating. One common casting number for the mid/high horse 327's in 67 would have been a "462" casting, late 67 saw the "291" casting commonly for the 68 production run. The two common terms were either a 1.94 or a 2.02 head, referring to the intake valve dia. Same deal with 350's after 67 also, except starting in 69 the heads were drilled and tapped for accessory mounting. So yes, physically they all do interchange.
Yeah, but there are a LOT of 350 heads. They are not all created equal. I think that the combustion chamber range alone is somewhere around 56cc-80cc. Valve sizes are all over the place, too. You will want to reasonably match what was there, or same chamber size, in a better, aftermarket head.
Roger that. For sure, the heads from the "little" Z/28/302 would be way too much for a 210 horse 327. Kind of hard to answer a generic question though with little more than 327 and 350 to work with.
OK, A little more explanation. A good running 327 with double hump heads gets pulled out and replaced by an "upgrade" 350. The double hump heads get sold off. Are basic 327 heads available for a replacement for the double hump heads? What would the most cost effective head setup be to put the 327 back together? In this case high performance is not the goal, drivability is the goal. Bill
Bill, 350 heads will work on your 327. Avoid 305 heads like the plague, though. You will want to find some with similar size combustion chamber and valve size/port size in order to keep at least the same power output your 327 had when new. Best cast iron replacement head in my opinion would be a set of 1996 - 2000 Vortec L31 truck heads. These have better combustion chamber design and actually flow better than the old camel hump heads even with their stock 1.94"/1.50" valves. They are worth around 20-25 HP just as a bolt-on due to increased efficiency and unlike the old 461/462 casting number camel hump heads, already have hardened exhaust valve seats so you can run them on unleaded gas. And they have tapped holes for late model accessory brackets as well if you need them. Next step up would be GM aluminum Fastburn heads. Same chamber design, larger ports and slightly larger 2.00"/1.55" LT4 valves. Only drawback if you are wanting to use your old 327 intake is that both the Vortec and Fastburn heads require a Vortec specific intake (taller ports and different 8-bolt intake bolt pattern). I sold my Vortec heads to a circle track guy a while back. If you need a set of Fastburns with matching intake though, give me a holler. If you are replacing cam, consider the GM hydraulic flat tappet cam #2450247 used in their 330 HP crate engine (described here)...... http://www.speedwaymotors.com/GM-Pe...Chevy-350-330-HP-Long-Block-Engine,70027.html http://static.speedwaymotors.com/pdf/19210008parts.pdf Run 1.6 rockers on intake to bring lift up to 0.464" and 1.5 rockers on exhaust (already has 0.460" lift) and you are good to go. Good luck with your 327 build, Harry
Thanks 57----Thanks for the info. Garden variety 350 heads are pretty available to me, really don't need/want to get into vortex intake, if for no other reason, I'd like to use the 327 intake/carb setup. Bill
Many heads casting numbers were used on both 327 and 350. Any head earlier the 1996 would keep your intake, you may have to wobble holes and use tapered washers if it's later than 1986. You probably have flat top Pistons so I'd try to find any heads with less than the 76cc and use steel shim head gaskets. Look up the casting numbers and it will give you the info, years and specs
First I will ask you, why did u sell the camel hump heads? 2nd were they original to the motor or added on later? If they were original then u'd be better of going back with the same size combustion chambered head and valve size to stay within the power range you had, if they were added on then run ur numbers that is on the pad in front of ur passenger side head they will tell u what u need to kno about what motor u have and point u in the right direction of heads u need, in my opinion the 462 or 461 should of been put back on theyer a very good breathing head for that engine but don't shy away from the 305 I run them all the time and never had any problems with them as long as ur not running 500 horses or more, any small block Chevy head from early 90's will fit any small Block engine except for very few so google Chevy head casting numbers and start reading I'm sure you'll find exactly what u want, good luck, butch Sent from my iPad using The H.A.M.B. mobile app
I have a set of "double humps" off a 327 sitting on the shelf that I might be talked out of. They were off a low mile motor pulled from a wrecked car many, many years ago. I'm in Michigan City, IN if you're interested.
Not sure how strong your budget is but I found myself in a similar situation a while back - good short block with no heads. I called Aerohead, in Indianapolis, and told them what I had and what I needed. Very nice guys. I got a nice set of iron heads sent all the way to California for $660. They 1.94/1.50 have hardened seats, stainless valves, screw in studs and new valve springs suitable for my cam. I couldn't buy heads and have them freshened up for that amount. http://www.aeroheadracing.com/
Most 350 heads 1985 and earlier will be just fine for what you are doing, Bill. Just keep combustion chamber volume between 62cc and 65cc (avoid the large chamber 76cc heads) and make sure they have hardened exhaust valve seats so you can run unleaded gas and you should retain the power level your 327 engine had when new. If you end up with bare castings for a good price, go for the 1.94"/1.50" valve size. They are usually cheaper than same castings machined from factory for 2.02"/1.60" valves and if valve seats are hammered, you have enough metal there to have the next larger size valves installed. If you only need to do exhaust side, 1.94"intake/1.60" exhaust work very well, BTW. Good luck, Harry
I have a 327 that I freshened up setting on a stand in the shop. It was a 100,000 mile 2 bbl engine from a 69 station wagon. I installed new rings bearings timing set and oil pump. a 30-30 solid lifter cam and a C3B edelbrock intake. And Ive got all kinds of heads. But I installed a extensively reworked set of 57 stagger bolt heads. I used those heads because they where on the first 55 chevy I owned . And I have a set of cal custom finned valve covers I bought new when I was a kid that fit them. I traded a core ford six engine for the intake manifold.
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