rmarti16

im new to this forum and im looking for help with my 351c! its in a 1970 mercury cougar, base model. fmx tranny. ford 9 inch. not sure about the gear ratio though.
point is i wanna build my own 351c! i wanna pump out 500+ horses outta that sucker.

i heard stroking the motor is the best way to go. ive heard good about the 408 and 377 but not sure which one to choose.
i want a 351c with enough torque to blow these little hondas out of the water and still be able to rev it to 6500+ rpms.

any ideas on the combo of engine parts for this?

list so far:

-stroker kit 377 or 408 (scat or recommended?)
-dished pistons for 9.5 comp ratio (i wanna be able to run 91 oct. pump gas)
-stock heads. any suggestions for what heads? (motor currently has 4V heads, but i also heard aussies are good as well?)
-cam, mechanical roller preferably (no idea on cam, have no idea what lift and duration needed)
-valvetrain (any reliable ones?)
-intake (has an edelbrock torker, but any other ideas?)
-carb (has holley double pump, 750 cfm)
-headers (hooker super comps? yes? no?)
-exhaust system (open manifold right now o.o custom?)
-electric fan? know if i can adapt one?
-ignition system, has msd right now
-new fuel pump (original though, mechanical. electric?)
-fuel system

any ideas will be appreciated. thanks alot!
im also posting a thread on the "classic mercury cougar" forum for help on chassis upgrades, transmission help, and gear ratio help.

George1861

Thev 4V heads like high revs with the huge ports & valves they have. The Aussie heads are considered an improvement over the US heads. The best is the aftermarket Aussie made alloy "3V" heads made by CHI.

xdclevo

I would go a minimum of 393 cubes and definatly run the 4V heads. Are the heads closed chamber?

Without going too mad, it will make and easy 500hp.

__________________
10.70 @ 125.00 on the black fun top
408 Cube Cleveland.

rmarti16

im not sure if they're closed chamber or not. how would i check? casting #?

also, just curious. best advice to get it whirring to 7000+ rpms with peak torque around 4k? with the 4v heads?

i only plan on driving the beast once its done, two or three times a week.
im upping the power limit. 650+ horses?

George1861

7K! Your talking race quality components for everything @ that level.

rmarti16

ive read that some guys use the stock bottom end and whirl it to 7k or 7.5k?

George1861

I was thinking top end stuff.

JayLo

I think 650 horse might be pushing the limits of a stock block.

Anyone know the safe long-term reliability limit for a stock block and one that's been hard blocked halfway up?

I'd like to know because I am planning a turbo motor based on a set of 3V CHI heads.

__________________
JL
1973 Cougar XR-7 convertible - 351C, 9:1 CR, 2V heads, Crower Ultra Beast, Weiand X–CELerator, 600CFM Edelbrock Performer, Dynamax long tubes, stock FMX, 3.89s w/ Detroit Locker

ROBERTSUNRUS

Hi, the Cougars with the 351 Cleveland 2V [small ports] came with an FMX trans. The Cleveland 4V [huge ports] came with a C-6 trans. If you are going for horsepower I wouldn't use the FMX. To beat the Hondas you might consider getting more traction and losing a lot of weight.

__________________

George1861

A '70 Cougar is a big car. To have a chance against a rice rocket on NOX he'd probablt need a 460. Back to the C...on the original list is dish pistons for 9.5 C/R. That'd be good if you have small chamber heads that are 10-11 to one C/R. Cs like flat tops or domed pistons to improve quench. Where you're looking @ diffrent heads you probably want open chamber heads & avoid the dished pistons. If your '70 is a 4V & you keep the heads, then go dish, that's what I did with my '71 M code C.