help with 327

i built a 1967 327 and it is 60 over, flat top pistons with 4 valve releifs, 305 heads 62cc,melling torque cam Lift .420/.443 Duration @ .050" 204¯/214¯
,edelbrock performer intake, edelbrock 600 carb, and a 2500 stall converter. it is a dog, it is not snappy at all and doesnt seem to want to really get with the program from a stop.When going down the road at cruising speed and i get into it it doesnt seem to accelerate like it should.i am running a 400 trans and cruise at 2400 rpms at 58 mph so im right in the power when im cruising so it should pull good but it dont.It is  in a 1987 chevy 4x4 with a 6inch lift 35 inch tires and 4.10 gears.What could be the problem.  

Take off the 305 heads and put the 327 heads back on. The 372 heads are a GM hp head. The 305 heads are good for boat ankors. the 305 heads have a smaller valve and a much smaller intake and exhaust runner.

492, 462, 186, 461, 461X are the original castings for the 327 motors. they were big valve and big runners which made big horsepower.

You may heed a single plane intake and a slightly bigger carb after the head swap. your cam looks a little small as well. Get a cam with somthing around a 500 lift and a 250 or 260 duration, or put in a 1.6 rocker. After you do that it will come ALIVE.  

what if i just got a set of 350 heads,easier to find, and kept the same cam.what do you think that would do for me.  

With those gears and that big a tire, I think your torque converter is the problem. That stall is really low for something with 4.10 gears and a 35-inch tire.

The other possible problem is your rear end gears. If the gears were 4.10s before the 35-inch tires, that means with the tires you've probably gut a sub 3.00 gear in your rear. You need to figure out what your rear gear is WITH the 35-inch tires. Odds are you need some lower gears, maybe something anywhere from 4.88 to well over 5.00.

If you install bigger heads, a 650 CFM carb will be needed.  

Ya a have to agree the stall is too low for your use.  
Professional hi-performance engine builder

Horsepower sells Engines and torque wins races.

Ya I did realize that it is a 4 wheel drive. ya you need to change your gears and converter like the other 2 guys just said.

As far as the heads the 350 heads are a good choice. Get the closed chambered heads. They will provide more torque. You can keep the same cam, thats not a problem. Just look in to putting a 1.6 rockers on. They will make the came seem bigger. I think you can also go with a 650 to 700 cfm carb.  

What stall do i need, should i go bigger or should i just get a converter closer to stock.I want to keep the gears i have because i drive it on the road all summer long and with the 4.10 it runs the roads good.I had another truck a while back and it had a stock 327 in it and it had the same axles and tires i have under this truck and it had a 4 speed manuel but it ran damn good and was actually kinda fast,but i rolled that truck and got this new one that is in much better shape.The manuel trans must have been the ticket but i like the 400 trans i have.  

Also if i go to 1.6 rockers do i have to change my valve springs or any thing else.  

theres not much lag differance from the 4 speed and the 400. You should probly call B+M or TCI, someone that deals with convertes so you get the right one.

Now the reason why that stock 327 ran better and stronger than the one you got now is just like I noted erlier, the heads. 327 heads have 2.02, 1.6 valves and 185cc to 195cc itake runners. 305 heads are 1.85 to 1.95, 1.4 to 1.5 vales and 165 intake runners. you'll see the diferance when you get 350 heads.

you can also take thoughs 305 heads to a machine shop nd get them worked out. get the 2.02, 1.6 valves and the intake and exhaust ports worked out.

putting the 1.6 rockes on you souldn't need to change springs unless you plan to take the motor up in the RPMs alot. But you might need to get the stock pushrod guides drilled out and rocker studs and guide plates intalled. You should have a good set of sturdy heads after that.

good luck  

The double hump heads only head 165-170CC runners from the factory and came with 1.94/1.50 or 2.02/1.60 valves depending on application and the 305HO heads had 1.84/1.50 valves and  the standard 305 heads had 1.72/1.50 valves and all 305 heads had 151-156CC runners.
If he has the smaller valve 305 heads then that is definitely the problem.  
Professional hi-performance engine builder

Horsepower sells Engines and torque wins races.

The head casting number is 14014416,mortec says they are from a 80-86 305 1.84/1.5 valves 58cc chambers.are these good or should i pitch em and get 350 heads.  

Actually those are decent heads there 305HO heads and have 1.84/1.50 valves but compared to the 2.02/1.60 double humps they fall short and both heads fall short to the aftermarket.  
Professional hi-performance engine builder

Horsepower sells Engines and torque wins races.

do you guys think the 600 carb is enough if not what should i try.