TECH: Increasing CR on 73 351C

Im looking for more low end grunt. I want it to look stock since the
whole car is 100% stock. Ill look into Aussie heads and / or MPG Port
plates.

(Gary Vitagliano) wrote in news:5769-445E0D2C-1126
@storefull-3212.bay.webtv.net:

> Im looking for more low end grunt. I want it to look stock since the
> whole car is 100% stock. Ill look into Aussie heads and / or MPG Port
> plates.
>
>

Aussie heads are NOT the way to go for low end grunt. They are free
breathing and are meant to rev. Your best bolt-on option for more low end
would be an "RV" cam that moves the power band down lower.

The Aussie head ports look much smaller than the monster ports on my
engine. I thought smaller ports = low end torque.

"elaich" > wrote
>Your best bolt-on option for more low end
> would be an "RV" cam that moves the power band down lower.

RV cam? Geeze that's a caveman term. How bout a 3/4 race cam. digging back in time for outdated terminology.

Go to one of the bigger camshaft manufacturers websites and check out what they have. They will usually show what the grind specs are and what can be expected from the cam in terms of performance, and which setup the cam is made for.

http://www.compcams.com/
http://www.cranecams.com/
http://www.erson-cams.com/
http://www.crower.com/
http://www.holley.com/index.asp?division=Lunati
http://www.iskycams.com/

Or you could go here where I've already brought up a generic cam search for that engine at Summit Racing. You can click on what type of performance you're looking for and it will bring up the cams fitting that description.

http://tinyurl.com/zvp79

MPG Heads also makes custom grind camshafts and will set you up with exactly what you need based on what you want. Give the guy a call. I've talked to the shop before. It's just across town here in Denver.

You're welcome

--
Scott W.
'68 Ranchero 500 302
'69 Mustang Sportsroof 351W
ThunderSnake #57
http://home.comcast.net/~vanguard92/

elaich wrote:

> Aussie heads are NOT the way to go for low end grunt. They are free
> breathing and are meant to rev. Your best bolt-on option for more low end
> would be an "RV" cam that moves the power band down lower.

I would have to disagree on that one. Let's review the cleveland head
specs. The American two barrel heads had perfect intake runners for low
end RPM, but had huge combustion chambers. The American four barrel
heads had the good combustion chambers, but had huge intake runners,
actually too huge for low end torque. It's the American four barrel
heads that were built to rev. The Aussie heads have the best of both
(factory) worlds. Smaller intake ports and smaller combustion chambers.
Also, occasionally an Australian factory 4V intake will be sold on ebay
that was factory for these heads. That is rare, however.
Properly built, these Aussie heads have plenty of low end grunt. The
original poster wanted more compression. These heads will do it, but
only to a certain point, maybe 1/2 to 1 point raise.
Once again, there are better choices out there, but the original poster
wanted a stock looking head.

3/4 cam, that's funny I was just mentioning to my friend what non sense
that term was.

I just put a pair of Aussie heads on my '72 mach 1's 351C.
The Aussie heads will in fact bolt up to the intake & exhaust fine, BUT,
they don't look identical to American Ford heads, however.
The American 2V heads have the cast "2" at the top of the head on the same
plane as where the valve cover bolts are and the Aussie heads have the cast
"2" at the bottom of the head, near the block. They'll know at a show in an
instant if you have Aussie heads.
I put 'em on anyway 'cuz they're awesome!!!

-Dave


"Kruse" > wrote in message
oups.com...
>
> Gary Vitagliano wrote:
>> Well Im open to Ideas to increase HP but the motor MUST appear stock.
>> Anyone use those MPG port plates? Will the aussie heads take my intake /
>> exaust manifolds?
>
> They aussie heads will take your stock intake and exhause manifolds.
> They look like Ford heads because they were Ford heads, in Australia.
> Not quite sure of your intent here, but if you want it to appear stock,
> they will work until somebody pulls a valve cover and starts looking at
> part numbers.
>

The car was orginally 2v, but someone had put 4v heads on the 351C. The 4v
heads were "open chamber" heads and I didn't want to deck them to increase
the compression. The 2v Aussie heads are closed chamber and still have the
smaller ports (like the American 2v heads) to help reduce fuel consumption.
You won't be disappointed if you go with the Aussie heads.

Dave


"Gary Vitagliano" > wrote in message
...
> So the heads gave you a noticable improvement? Did you have a original
> 4V car?
>

Dave please e-mail me directly please.