Drivetrain Safe power on stock bottom end [fox body]

91 Fox · Nov 17, 2020

Hello I want to do some bolt ons to my fox I was looking at the upper end kits. So heads, upper and lower intake, cam, and probably headers. I was wondering how much power I can have while still be some what reliable on a stock bottom end? Would it be safe to install all those bolt ons without changing rods piston crank?

Adieu · Nov 17, 2020

In all reality 450rwhp or so seems to be the magic number to break stuff.

91 Fox · Nov 17, 2020

So do you think its safe to do the top end kit?

7991LXnSHO · Nov 17, 2020

From a power standpoint, no problem.
You still need to make sure the cam lift and top intended rpm match the springs. Also that the valves do not hit and that the cam gear and distributor gear are compatible.

Mustang5L5 · Nov 19, 2020

Many people install top end kits on the stock bottom end. Really, the biggest issue, like said, is ensuring the cam lift agrees with the pistons, as some of those kits require special pistons. Custom grind cams can be a work-around as well.

My cam is 0.565" of lift on the intake side, but it clears my stock pistons due to a custom grind.

91 Fox · Nov 19, 2020

Mustang5L5 said:
Many people install top end kits on the stock bottom end. Really, the biggest issue, like said, is ensuring the cam lift agrees with the pistons, as some of those kits require special pistons. Custom grind cams can be a work-around as well.

My cam is 0.565" of lift on the intake side, but it clears my stock pistons due to a custom grind.

bought my car with a different cam already in it. So what do I do to make Shure It works?

2000xp8 · Nov 20, 2020

You either need to find out what the cam is, or get a new one.
If the heads and intake are stock, i'd say the chances are low you have an aftermarket cam or the last owner wasn't the most informed.

General karthief · Nov 20, 2020

With what I've read around here over the years I would say not informed.

7991LXnSHO · Nov 20, 2020

A dial gauge can be used to check cam lift.
you can use silly putty or modeling clay to check piston to valve clearance with a mock up assembly and hand rotating the engine. Google and YouTube will have how to’s on these steps.

Haste347 · Nov 27, 2020

HCI on stock bottom end is completely fine, power adders are completely fine as well. Just don't run them both at the same time and expect it to hold together. I have seen 'stangs with stock engines that had aftermarket cams just to get "that sound". Modeling clay is the route I would take if I were in your situation.

HemiRick · Nov 27, 2020

It the engine still runs and has been taken taken to red line....its more than likely fine....

Drivetrain Safe power on stock bottom end [fox body]

91 Fox

New Member

Adieu

Easy there, this ain't a dating site.

91 Fox

New Member

7991LXnSHO

wanna catch the space herp

Mustang5L5

That is…until I whipped out my Bissell

91 Fox

New Member

2000xp8

General karthief

wonder how much it would cost to ship you a pair

7991LXnSHO

wanna catch the space herp

Haste347

Member

HemiRick

I'd be looking at jacking under the house

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Drivetrain Safe power on stock bottom end [fox body]

New Member

Easy there, this ain't a dating site.

New Member

wanna catch the space herp

That is…until I whipped out my Bissell

New Member

wonder how much it would cost to ship you a pair

wanna catch the space herp

Member

I'd be looking at jacking under the house

Similar threads

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