Minimum PV clearance on a 3V 4.6L

[circusboy]

What is the minimum pv clearance needed on a 3V motor?

I'm getting ready for the motor swap and just wanted to make sure I'm ok.

I put a stock 3V head on the new short block last night. I got .145" on the intake valves and .260" on the exhaust.

I also wanted to make sure that the lift on a stock cam is .432"

My new cams have .492" lift on intake and exhaust.

THat would leave .085" on the intake valves and .200" on the exhaust valve.

 

[circusboy]

is there somewhere i can go or look to find this info

 

[circusboy]

thanks anyway fellers. I guess i'll be the test mule again, wish me luck lol

 

[Chris06GT]

Dude, man, you in a hurry?....lol

Most these guys don't get settled down and a chance to get on a computer till later in the evening and have time to read the threads....

Give it a bit...someone will chime in...

 

[US-1]

You're fine. Let it eat.

 

[spyder7724]

You're fine. Let it eat.

agreed, even though mine is a 5.4 (which actually makes it worse) i'm running .560"+ cams with flat tops no valve reliefs and i have zero PV issues...although i did lock out the VCT but those cams will still be fine using the VCT if you choose as long as you haven't gotten silly with duration or valve timing events.
take SD's word for it though he's got more experience.

 

[circusboy]

vct is going to be locked out. 241/251 duration.

96 teskid block with 04 cobra rotating assem.

 

[US-1]

At the risk of repeating myself................

 

[circusboy]

I'm there dude, chill lol

 

[46addict]

vct is going to be locked out. 241/251 duration.

96 teskid block with 04 cobra rotating assem.

Bringing this back from the dead..
Has anyone ran this combo on their car? Can you use 4v pistons with 3v heads?

 

[BruceH]

Bringing this back from the dead..
Has anyone ran this combo on their car? Can you use 4v pistons with 3v heads?

You can. It doesn't make a whole lot of sense unless you are getting a bargain on pistons that will make the compression ratio you are looking for. Most 5.4 pistons also have the same compression height as 4.6.

If using 4v pistons with a higher lift cam you would want to have an exhaust valve relief cut into the pistons. By the time you do that it would of been better to start with 3v specific pistons.