Partial upgrade now or wait ??

jlopes":1ccsfdy8 said:

I have enough for the following:
Spintech muffler

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The sound of the spintechs on the six sounds really good, Best choice.Maybe a little biased but, I Love mine.

jlopes":2kxj35ey said:

Here is the plan for the engine:
CI Head and Intake Manifold. Street/strip port

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I wish I could, Very Jealous

jlopes":2kxj35ey said:

CI Headers

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Nice upgrade, you thinking true dual or a x-pipe in there?

jlopes":2kxj35ey said:

Autolite 4100 1.08 carb

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Don't know much aobut 4bbl... maybe it's the same as my 1bbl-x4!

jlopes":2kxj35ey said:

zero deck block
new pistons

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What compresion ratio are you aiming for? IIRC, high CR helps mpg and HP, IDK what low CR would do except give the oportunity to use a blower

jlopes":2kxj35ey said:

arp bolts

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jlopes":2kxj35ey said:

cam : 1.08 lob separation, not sure on the profile yet. I am more interested in bottom end torque than top end.

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what ever it is, advancing the cam an extra 2* will lower the rpm range of the cam as mentioned

jlopes":2kxj35ey said:

rocker arm: 1.6 ratio: don't know whether to do roller tip or not

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the 1.6 rockers will give a .480 lift on the .450 cams, be careful on lift and don't go over .500, that's when the valve will hit the piston

jlopes":2kxj35ey said:

double roller timing chain

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helps in adding advance, and it's a great precaution.

jlopes":2kxj35ey said:

Is there anything I am missing?

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what size valves? because of the CI head, you can run the largest he has to offer :mrgreen: 1.84 intake and 1.56 exhaust
More Air in lower RPM's help torque, and bigger valves give more air
Springs, you'll need some stronger ones

This sounds like a great build, the extra torque will keep you in decent mpg

MPGmustang":uf97t0c2 said:

...what size valves? because of the CI head, you can run the largest he has to offer :mrgreen: 1.84 intake and 1.56 exhaust
More Air in lower RPM's help torque, and bigger valves give more air...

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Bigger isn't always better. From what I've read, using intake valves that are larger than necessary can make the air/fuel charge travel slower at lower RPM's and hurt low-end torque.

Bigger isn't always better. From what I've read, using intake valves that are larger than necessary can make the air/fuel charge travel slower at lower RPM's and hurt low-end torque.

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Thanks for the heads up... I will definitely ask Mike from Classic what is the best cam, valve size and other specifics for what I want. I will probably shoot for a high CR, for the amount I drive the mustang I don't mind buying premium gas.

Some of the questions cannot be answered until I pull the engine...
Maybe I should get another block so I can drive the car while the engine is being rebuilt. I plan on doing most of the work myself so having another block will allow me to take my time. What do 200 block go for now a days?

Funny, the planning and building is almost exciting as driving.

...Maybe I should get another block so I can drive the car while the engine is being rebuilt. I plan on doing most of the work myself so having another block will allow me to take my time. What do 200 block go for now a days?

Funny, the planning and building i s almost exciting as driving.

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If you need to use the car than yes get another block to build, as to price they can range from free to about $200 for compleate core.

Installing a cam, however, revealed all of the inherent weaknesses in my worn out engine. I could never get it to run right and the old rings took a dump on me.

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Would you think installing the 1.6 rockers arms without the new cam cause problems? Just me a little more umpf until I save enough the the Al head and bottom end rebuild.

Would you think installing the 1.6 rockers arms without the new cam cause problems? Just me a little more umpf until I save enough the the Al head and bottom end rebuild.

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It won't cause any problems though if it will help you much is also another question

Whats the best muffler configuration? I was at a car show this weekend and the majority of the mustangs were offset in and center out, however they were all V8's.

Whats the best muffler configuration? I was at a car show this weekend and the majority of the mustangs were offset in and center out, however they were all V8's.

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In my opinion a center in and center out is best doubt it makes all that much differance though and the offsets are msybe done to make it al fit in a small area.

bubba22349":1ixoh3wd said:

Would you think installing the 1.6 rockers arms without the new cam cause problems? Just me a little more umpf until I save enough the the Al head and bottom end rebuild.

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It won't cause any problems though if it will help you much is also another question

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Well, I imagine if you do the header, exhaust, ignition, and some sort of carb upgrade then yes, the rockers will be worth a few ponies and a couple hundred rpm at the high end. Just slapping them on a totally stock engine would be pointless, though.