Are the new 351M Edelbrock Heads any good? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-20-2008, 07:14 PM
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Are the new 351M Edelbrock Heads any good?

I have a 351M and a 400 Ford motors that are in a couple of Broncos I own a 1978 and a 1979.

These are not very well supported engines by the performance after market but Edelbrock does make heads for them now, I was just wondering if anyone has tried these new heads out and if so what cam did they choose to go with them?

Another problem I'm finding is the choice of Compression increasing pistons and rods I am not finding any.

What I'm trying to do is build a mild performance Big Bronco that runs well and gets decent (For a Big Bronco) gas milage and sounds good as well.

I have a limited budget so any suggestions would be very helpful and greatly appreciated.

TIA

Cheers,Rick.
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Old 01-20-2008, 08:25 PM
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I don't know anyone with those heads yet,however I do know Cleveland heads pretty well. From examining them, they look to be a great improvement. With the advances made in head/porting design since the original heads were created that should be the case. Many other Cleveland performance parts can be used if you are wanting a mild build. They use the same cam and dist., as well as much of the valve train. I wouldn't worry about higher compression pistons if you get the heads, you still have to be able to run pump gas.
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Old 01-20-2008, 10:02 PM
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Hi Rick,
Flatlander has a kit for your 400, part #1065HP
As for the 351m Ohio piston or TRW both had 9 something
flattop pistons, don't know if they still carry them.
Good luck,
Rich

http://www.flatlanderracing.com/hpkits-ford.html
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Old 01-21-2008, 05:30 AM
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Thanks for the info keep it coming.

Looks like I hit the 351M jackpot here.

Now I have a question about the higher compression and why you say don't worry about it because of the pump gas problem.

I don't understand why higher CR means I can't run pump gas, if I improve the ignition system won't that allow me to run a higher CR?

Again I'm just knew at this and probably know just enough to get myself in trouble LOL.

Rick.
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Old 01-21-2008, 06:59 AM
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In general,gasoline has a lower octane rating than it once had. That plays to compression ratios. The higher the octane the higher compression ratio you can run. I notice that you have "Canada" in your avatar, so gas there may be better. F.I. became common because it can better contol combustion with lower octane fuels, carbed engines don't have that ability. I would suggest no more than 9-1 compression on a street driven mild engine. If you wanted a real high compression, you can get by with it if you use a long duration/overlap cam to bleed off low rpm cylinder pressures. That of course weakens bottom end power production. I used to run a built up GSXR that had 14-1 compression, but the cam was pretty wild and it had a 12,500 rpm redline. Not your typical daily driver, but loads of fun
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Old 01-21-2008, 01:33 PM
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Try and get a decent quench height
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Old 01-21-2008, 01:54 PM
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Please explain?

Quote:
Originally Posted by fiscus
Try and get a decent quench height
As I said I am fairly new to this and do not understand some of the terminology


Thanks, Rick.
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Old 01-21-2008, 07:21 PM
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Quench, although non existant in stock open chamber heads refers to the area between the piston and the head(when there is a quench area). It needs to have a portion of the combustion chamber that is flat with the surface of the head. As the piston comes up it forces the mixture out from that area and creates a better burn path. Most open chamber heads such as open chamber cleveland(or 400/351M) as well as Hemis don't have one. I haven't looked at the Edelbrock versions, but they probably have some, I'll look at them later and see. The BOSS 429 had what was called a "clipped" Hemi and had the sides filled in to give some quench. Quench is typically a wedge head property, it gives some better low end power.
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Old 01-21-2008, 07:27 PM
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woodz428 didn't the Boss 429 head look like a hemi head with two sides squared off ?
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Old 01-21-2008, 07:43 PM
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A higher compression engine requires higher octane fuel due to higher cylinder pressures. If your pressures are too high the fuel and air that is being compressed will ignite before the sparks plug does. This is called knocking, pinging or detonation. Higher octane fuel takes more heat/compression to ignite. Hope this helps.
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Old 01-21-2008, 09:38 PM
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Quote:
Originally Posted by onebadmerc
woodz428 didn't the Boss 429 head look like a hemi head with two sides squared off ?
That's correct, because of the sides(quench area), it was not a true hemi by definition. A true hemi is basicly half a sphere, like cutting a ball in half, that's the reason it was referred to as a "clipped" Hemi. Many of the heads were modified at the time, by well intentioned builders, by opening them up to a hemi. That was something they understood, I don't believe it made any more HP, but do know they ruined a lot of, what are now, very valuable heads.
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Old 01-21-2008, 11:09 PM
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351 m

I have a buddy, 25 years an engineer at Ford, was saleen's VP of Research and DEvelopement that had a set of Austrailian heads for his Pantera, He said they were supposed to be a lot better than Usa factory stuff I don't know if they are still available. the Mexican Mustang II 302 fastabacks built after usa production stopped and the tooling was shipped south had a lot more power and better brakes
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