is the 1116 or 1115 better?

K

kendall

Senior Member
i was wondering if the 72cc edelbrock heads would be better then the 62cc 1115 heads. does anyone know what the compresion would be from one to the other on a standard 8ba? 8.1 to maybe 9.1 on the 1116 heads? would you even tell a differance in proformance? .......just thinking and was wondering if any of you guys had an opinon.
 
The 72cc head is their low compression head for large displacement or blower motors. The 62cc head is the hi compression one for small displacement engines giving about 8.5 on a 276 ci engine and 7.5 on a 239.
 
Ol' Ron, are those heads marked to identify them as to what they are, Im about to buy a used set and want to know what they are before I buy them.. John
 
Ol' Ron said:
The 72cc head is their low compression head for large displacement or blower motors. The 62cc head is the hi compression one for small displacement engines giving about 8.5 on a 276 ci engine and 7.5 on a 239.
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Ol' Ron, hi, with 8.5 compression will the engine be hard to crank and start? I have a 276" engine in my '40 and it cranks hard. Didn't do this with the stock engine.The battery cables are the heavy six volt style and I have overhauled the starter with new brushes and bushings and it seems strong, the engine acts like it is tight or maybe too much compression. Have only had it running for less than an hour...maybe it will loosen up? Thanks, Buford.
 
Buford said:
Ol' Ron, hi, with 8.5 compression will the engine be hard to crank and start? I have a 276" engine in my '40 and it cranks hard. Didn't do this with the stock engine.The battery cables are the heavy six volt style and I have overhauled the starter with new brushes and bushings and it seems strong, the engine acts like it is tight or maybe too much compression. Have only had it running for less than an hour...maybe it will loosen up? Thanks, Buford.
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I have a 276 with 62cc 8.5:1 Edelbrock heads, and it cranks easily. When it was started for the first time the car was 6 volts. The 6-volt Optima and 00 cables spun the engine very smartly. That was six years ago.

Last time I did a compression check, maybe six months ago, all cylinders read around 150 psi. With a 12-volt Optima and a 12-volt starter, the engine stills spins easily.

Did you pay attention to piston ring gaps when you assembled your engine? Many years ago, I forgot that step and it cost me an engine. It began with symptoms like yours.

First thing I'd try is a different starter.
 
I bought a set of 72 cc 1116's for my 265 8BA because I didn't want a compression ratio much higher than 8:1. I haven't fitted them yet because I have Egge pistons and had to machine (ok, an angle grinder was used) the cast heads to stop the pistons hitting them. I am reluctant to risk these beautiful new heads to a machine shop so am still thinking what I will do ...
Apart from 1116 on the box, the heads have 06 (or 09) stamped near the middle of the upper unmachined part of the head on the side facing the block. Further along, closer to the water neck outlet, the right head has 906? (? upside down) and the left head 906P. These markings won't be visible when the heads are fitted. I can see no other markings.
 
ol' ron.....what would the proformance be on a 255 c.i. engine with the 1116 heads, with more cc's in the chamber bringing down the compression. do you think it would run too mild?

thank you
 
WEhen the engine was designed, the original Cr was 6.8-7.2, Unfortunately in real life it was closer to 6. The gasoline was 60 -70 Octane. Now you have 87-93 Octane and all the engines I have built over the past 20 years have had around 8.5, two of them are almost 9:1 all run very well on the present regular 87 Octane. The 9:1 runs on 91 Octain, but has never tried 87.
Now after all this BS, why bother to spend 600 plus dollars on low compression heads?
Another fact is the combustion chamber. Depending on the pistons and deck height you have to mill the heads to get .040-.050" piston clearance. If you don't do this two things can happen, piston hit head, very bad. The other is too much clearance, this reduces the turbulence in the chamber which can cause pinging, but will reduce the power and economy of your engine. That's why some engines run better than others. Don't forget to check your jetting, and advance curve.
 
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