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351c engine build advice

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Old Oct 24, 2008 | 09:39 PM
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Default 351c engine build advice

If possible could some of you pros let me know if the following sounds like a good engine and what would you think the output and reasonable cost would be?

I have poseted this at other forums and did not receive and hits so any input would be great. The follwoing it what I know about the motor.

351C bored .030" over, Keith Black flat top pistons, full floating pins, polished rods, 10/10 crank, Crane cam; 272 duration, ,516" lift 108 centerline, Johnson lifters, Cloyes double roller timing set. Moroso 7 qt. pan, High volume oil pump. Ported and polished 2V heads w/stainless steel boss valves, Crane unshrouded combustion chambers, Edelbrock performer intake manifold, Ford Motorsport tall aluminum valve covers, Headman equal length headers. Ford electronic ignition.

The engine has not been turned over and does not come with a warranty. If its worth it it will go into a 72 Mach with a 3.70 and an AOD.
Any feed back is most appreciated as I have been kicking tires for two years now on replacing my motor.
Old Oct 24, 2008 | 09:47 PM
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If you have to go out and get an engine a Cleveland isn't necessarily the best for performance unless you have a large budget, good Cleve parts cost money. If it's going into a car that originally had a Cleve and you're going for originality then that may be a factor. It depends on what you want, if you're looking to extract maximum performance on a limited budget then a Cleve ain't the best. Once you get far enough into the realm where you're extracting massive performance, it doesn't really matter what you run, it's all gonna cost a crap load.

What's the engine cost? It'll run well, and if it's cheap enough then it it may be worth grabbing it, you could always put better heads on it later for the extra power and come out in the budget department.
Old Oct 24, 2008 | 11:30 PM
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It would help to know your compression ratio.

The Edelbrock performer manifold may be a little on the conservative side, you may want to swap it out for a performer RPM, or something else. Funnelweb out of Australia makes some awesome cleveland manifolds.
http://www.parkerracing.com.au/

I'd guess with a 650-750 CFM vacuum secondary carb, more aggressive dual plane manifold and a good tune you would be in the 350-380-hp range, more if you got a little more aggressive with the induction.

I'd ask if the engine builder had the 351C Moroso oiling orifice kit installed, it is cheap insurance.
Old Oct 25, 2008 | 07:40 AM
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Is there anything wrong with the 351C you have in you car?

I have close to the same engine in mine.

Bentworker is right with the intake, I have the performer and I want to upgrade to the Air Gap. I think it would gain a bit of power.

What are they asking for the engine?

How much to rebuild yours? A rebuild of your motor should include some warranty.

With your current 351C if it is a 2V with the FMX and 2.79:1 gears it is slow.

Gear change will help a lot. The Cleveland is a bit of a dog at low rpm.

When I bought my car in 1994 my friends all said that they thought it would be faster. Now it rolls the tires and flat out moves.

351C C6 3.89:1
It is not built for the freeway, the AOD would help with that though.

I bought a '73 Mach I a few months ago for $3200. The engine is a 351 4V that is a fresh rebuild (I picked up the engine from the machine shop). It is supposed to be over 400hp ( I was told 500hp but I have my doubts) I bought this car mainly for the engine so I figured the car was free.

The rebuild on that engine cost close to $4000 in parts and labor not including some of the parts that the original owner bought seperately.
Old Oct 25, 2008 | 11:20 AM
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The regular Performer is plenty of manifold(if it's the newer redesigned one and not one of the older ones that's still floating around). You don't really need the RPM unless you're turning 7,000+rpm or have gearing that lets you run a very tight power band near peak rpm(which basically means a custom geared transmission). Even the low rise dual planes will make peak power at 6,000-6,500 with good heads and a mild cam. The high rise dual planes make a tad more peak power but are down on power at the lower end of the power band, enough so that it becomes a wash, only the bigger intake reduces throttle response and increases fuel consumption.
Old Oct 25, 2008 | 12:49 PM
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My performer intake was purchased new in 1995. My C6 is in drive within about 15 feet under light load. Shifts at 70 at full load. I think I could use the higher rpms. I run about 4k at 75mph.

Or I guess I could go with around a 3.55 gear in the rear.

It is fun either way though. Just my toy.
Old Oct 25, 2008 | 01:39 PM
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Or stick something in it with an overdrive, like a 5 speed or an AOD.
Old Oct 25, 2008 | 01:55 PM
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Thanks for all of the input. Currently the car does have a 351c 2v with headers, torker intake, holley 670cfm carb, a tired FMX and the 3.70 posi rear. It in fact used to have the 2.79 rear.

The car has a really bad lifter tick and I have tried some tricks to get it unstuck but without luck. I do notice that if the car sits for a week or so it will spit a little oil out the tailpipes but it does not smoke. The car was bought 3 years ago and the engine was supposed to be new but thats what I get for buying unseen on ebay. I was hoping for a stronger 351c to replace it but it is not a priority as the car is a project however the engine I am asking about also comes with a rebuilt beefier AOD for ~3k.
Old Oct 25, 2008 | 02:19 PM
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Maybe just replace the lifters and while you have it apart put a smaller intake on it. I think a Torker is a bit much. Maybe go with the Air Gap.

Do they still make a Torker for the Cleveland?

Just for fun put some Lucas oil in it. My friend put some in his 3.9 and it helped the lifters.

3k sounds good, but no warranty? Are you getting it from the builder or the owner? Maybe talk to the builder about it. I picked up my 4V from the builder and he said he would still warranty it even though I am a different owner. He suggested I have it installed by a pro though. He knows my mechanic and said it would be good to go.

AOD would be good for cruising, but mine is just a weekender and doesn't really matter. I rarely ever take it down the freeway.
Old Oct 25, 2008 | 09:38 PM
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Here is the info straight from Edelbrock. I would consider an RPM airgap on that engine. I'd also agree that 3K is a very good deal if it is as advertised. You can eat up a lot of money on a torque converter and everything else that you will need to make a complete package with that AOD, if you are not a freeway driver you may want to have Broader (or someone else that knows what they are doing) rebuild that FMX.


Straight from Edelbrock...
Performer (Idle - 5500 RPM)
Patented Dual-plane, low-rise design with a 180º firing order greatly improves torque over a wide rpm range for excellent throttle response from off-idle through 5500rpm. Performers are ideal for passenger cars, trucks, 4x4s and RV's.


Performer RPM (1500 - 6500 RPM)
A dual-plane, high-rise designed with a 180º firing order greatly produces incredible top-end horsepower while retaining great throttle response. Their larger plenums and runners match high-lift cams, free flowing exhausts and other modifications of a high-output engine. Great for street or strip.



RPM Air-Gap (1500 - 6500 RPM)
Ideal from 1500-idle to 6500rpm, the RPM Air-Gap offers the same street/strip performance benefits of the Performer RPM but with the addition of Edelbrock's patented Air-Gap. The RPM Air-Gap design features an open air space that separates the runners from the hot engine oil for a cooler, denser charge for more power.


Edelbrock still makes the Torker, and is for 3500+

Last edited by Bentworker; Oct 25, 2008 at 10:07 PM.



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