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 Post subject: Re: lack of performance
PostPosted: Wed Apr 21, 2021 6:22 pm 
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Joined: Fri Jul 08, 2016 2:19 pm
Posts: 81
Location: Odessa FL, Blairsville GA
The heads should be good. They are 1974 service replacement Boss 351 heads. These were made by Ford for racers, primarily.
Not sure if they have been ported or not. It is definitely a circle track motor, based on the air breather setup (each valve cover has a breather in the front).


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 Post subject: Re: lack of performance
PostPosted: Wed Apr 21, 2021 9:01 pm 
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Joined: Mon Oct 29, 2012 2:39 pm
Posts: 1726
74 heads will have open chambers. I've never seen or heard of any service closed chamber heads cast in 74. 73-74 heads will have 2.04/1.66 valves in them unless reworked.

The spark sounds a bit weak - but without an o-scope, hard to tell.

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 Post subject: Re: lack of performance
PostPosted: Wed Apr 21, 2021 9:36 pm 
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Joined: Fri Jul 08, 2016 2:19 pm
Posts: 81
Location: Odessa FL, Blairsville GA
From the SVO catalogue, the heads are
D1AE-GA. CC. 4L19 4dot
Cast as closed chamber service replacement heads on Nov. 19, 1974.


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 Post subject: Re: lack of performance
PostPosted: Wed Apr 21, 2021 9:39 pm 
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Joined: Fri Jul 08, 2016 2:19 pm
Posts: 81
Location: Odessa FL, Blairsville GA
I’ll try to check the spark, maybe get a new MSD dist.
Would weak spark cause overall lackluster performance, any other symptoms?


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 Post subject: Re: lack of performance
PostPosted: Thu Apr 22, 2021 6:17 am 
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I think you're simply asking too much from the combination, or assuming a used engine should behave like a new engine.

A 3700 lb vehicle (plus driver) is going to be a huge chunk of weight. This isn't a 1500 lb circle track car, or even a 2400 lb Shelby Cobra replica. A Galaxie is a very large car.

Unless the heads are ported, the performance is going to be lackluster.

Who knows what the camshaft is.

Who knows if the engine is just simply worn out.

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 Post subject: Re: lack of performance
PostPosted: Thu Apr 22, 2021 7:13 am 
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Joined: Tue Nov 06, 2012 10:23 am
Posts: 1496
Location: Texas
X2 what Brent said. Sucks but you might just have to either chassis dyno it to see what the numbers are looking like or just pull the motor and open it up to see what is really inside. If it was a circle track motor then who knows how hard it was beat on and possibly over rev'ed etc... Personally the guessing would irritate me and I would have already taken it apart - that is if I had not already done so when I first got it. Either way, I hope you figure it out.


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 Post subject: Re: lack of performance
PostPosted: Thu Apr 22, 2021 8:41 am 
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Joined: Fri Jul 08, 2016 2:19 pm
Posts: 81
Location: Odessa FL, Blairsville GA
Thanks.
It sounds like we will end up tearing into it.
I just figured that even if it is used up a good bit, it should still be stout enough to run strong.
Based on the parts it had, how would you build it to run the best in this car with the toploader and 4.11?


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 Post subject: Re: lack of performance
PostPosted: Thu Apr 22, 2021 9:51 am 
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Joined: Tue Nov 06, 2012 12:02 pm
Posts: 494
Figure out what you have exactly and then we can go from there.

I thought when you originally bought this, it was a 351c, and now you're saying it's a 400 block? Does it have the 400 crank? What intake does it use with the 4v heads?

With a full sized car, I feel the more cubes the better. Keep the compression around 10:1 so you can use pump gas. Have the heads gone through and then get brent to order you a cam package for it. Once you've got a good engine to start with, make sure the carb and ignition is up to the task and reliable, and then you'll have a good runner.


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 Post subject: Re: lack of performance
PostPosted: Thu Apr 22, 2021 7:46 pm 
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Joined: Fri Jul 08, 2016 2:19 pm
Posts: 81
Location: Odessa FL, Blairsville GA
Yeah, I was initially told it was a 351, but somebody pointed out the ridge by the distributor.
I would assume it has a 400 crank, but will likely end up finding out for sure by tearing it down.
The balancer is a Boss 302 item, and has been lightened considerably.
The guy in CA that redid it said the builder probably lightened the crank also.
It has a Torker intake with spacers.


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 Post subject: Re: lack of performance
PostPosted: Fri Apr 23, 2021 9:49 pm 
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Joined: Fri Jul 08, 2016 2:19 pm
Posts: 81
Location: Odessa FL, Blairsville GA
We put a known carb, an Edelbrock 650 with me plugs, and after 3 5 minute runs, the plugs are black, just like with the 830.
Sounds like a spark issue? I have a 2 yr. old Blaster 2 coil, old Mallory Unilite with new module.

If it’s the distributor, which is the best way to go?
2 local shops are recommending Chinese Pertronix copies, Motor Works and another one.
One of them curves the distributor and verified settling, about $200.


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