seanjuan

I got a small block with centerbolt heads (1987 up right?) but it looks like there is a stock 4bbl computer controlled carb and distributor. I dont have the computer, just the engine. Since 1987 up heads usually came with fuel injection only and the weird intake pattern for 1987 & up cast iron heads, I doubt that someone swapped it to carb from FI. Everything looks stock and I searched all over the internet looking for centerbolt headed engines with stock carb setups. I really want to find out what kind of heads I have. Any help is appreciated.

Vader

Don't forget about the Canadian and export models.

SSC

Like Vader mentioned also domestic EL Camino's, HD trucks that retained the older body style (80 1/3 -86) wich used carbed engines on that platform 2500+ until 90. They all used centerbolt heads with a carb.

seanjuan

thanks for the help I will try to find out if these engines have any potential with the stock heads ported. If you got more info for me keep 'em coming!

Rick King

yes

I had a 1987 Formula that was a factory carb 305 ho (roller cam)about the same horse as a tpi

later

Petes 84Z28

Um, no.
The only carbed V8 available in the thirdgen in 1987 was the LG4, rated at 160 to 165 hp.

SSC

All the castings Ive come across were swirl port junk heads. Sure they can be opend up and all but thats alot of work for a small gain.

mystikkal_69

iTrader: (2)

all the carbed 87' 305's i ran across have had the 081's in them.

Damon

The G-body cars (Monte Carlo SS) still had a computer controlled 4bbl 305 in them in 1987. They used non-swirl port centerbolt heads.

seanjuan

Are the 083 heads like 081s from the 305? Just 1.94 intake instead of 1.84? Did 083 heads come on any 350s other than old police car 350s?

F-BIRD'88

The '87 Monte carlo SS used these 081 heads with a CC carb

The 083 (350L-98, TPI) head and the 081 (305TPI and '87305HO) are very simular.
The difference is the intake valve size
1.94 vs 1.84" and the combustion chamber size 64 vs 58cc's the port size and shape is essentually the same.

The 081 305TPI and HO head has tons of hi per potential with larger valves and home porting. When you "sweep out" the chamber walls to fit a larger valve in the 081's, the chamber will be enlarged a bit . If you want to maintain the stock 58cc chamber size after modding with larger valves then they can be flat milled to spec.

They have just as much potential after porting as the L-98 350 cast heads do with equal valve size installed.

If you have a set of 081's they are a good head casting to start with for a performance street motor wether it's going to be a 305 or a 350.

For a 305 project install 1.94x1.50" valves. For a 350ci motor go with 1.94 or 2.02 and 1.60" exhaust valves.

easy 400Bhp potential.

kdrolt

Bcars (Caprice, Impala, and many of the other fullsize GM models) had CC carburators up to the 1988 model year for v8 sedan models. The sedan v8 fullsize models all got TBI for 1989.

On wagons it's a different story -- they stuck with CC carbs thru the 1990 model year and didn't get TBI until 1991. BUT, the engine was the old 307, and not the hyd roller 305 or 350.... and I don't think the late 80s 307 was center bolt on the valve covers.

So you may have a 87-88 v8 from a fullsize GM sedan. Read the head casting # by removing a valve cover and then post it.

chevymad

87 was the last year for the f-bodies to have the cc carb. I have an 87 formula with the cc carb. Things are all kinda one off. The heads are centerbolts 081s. NOT the swirl ports. The intake is a one year only thing for f-bodies as well, since it has the correct bolt angle for the centerbolt heads. The lg4 also has a roller cam in this year.

seanjuan

I forgot where to look when I take the valve cover off. Is it on top of the head by the rockers?

Dyno Don

iTrader: (7)

That "307" was an Oldsmobile engine.

Keith_Indy

The numbers are going to be in-between the rockers.

http://www.mortec.com/locatpg2.htm

seanjuan

Thanks!