Terry Burger

iTrader: (4)

like a really really loud booming sound, like maybe I forgot to put my header on, with a hint of rattling.

jmX

Terry, I have some comp 7.300 pushrods I'll sell ya for $50 + $10 shipping if you want them.

BIG PD

i've done it before too terry. i don't think your pistons will have anything but little knicks on them. they should be fine. your intake valves will pry all be slightly bent and need replacing. no reason to give up on your engine. intake valves don't cost but 15 a piece and you will need 8. good luck.

CHRISPY

ROTFLMAO!! The mental image of that is hilarious

Terry Burger

iTrader: (4)

OK I just went home for lunch, and picked up an air hose attachment on the way. I can hear air whizzing by the intake valve, so looks live a ptov issue (sigh). No time for the car right now but I'll figure out what I want to do next weekend.

CHRISPY

That is what I thought crappy deal man...

I'd just pull the heads try and clean up the piston tops and get the valves replaced. I'd throw in a smaller cam as well and measure it up.

.035 is a lot of milling on 5.3L heads.

try for 80 thou clearance on the intake side. You might have whacked the exhaust valves too but I think it is probably just the intakes.
Good luck,
Chris

LS1derfull

My experience is PTV goes to hell with aftermarket valves, your combo with stock 2.00/1.55 valves may have survived but not with 2.02"/1.60" valves , that cam and milling. I would pull heads and cut valve reliefs in stock pistons. Isky tool, has worked grandly with Slowhawks setup. Just my 2 cents.

CHRISPY

he already has valve reliefs now

cantdrv65

iTrader: (3)

A 233 duration cam with no valve reliefs and you didn't check PTV??? Terry, you mom would scold you for this....
Good luck man...

Terry Burger

iTrader: (4)

I know I know, I was lazy. I guess now I get to pay $200 and spend 8 hours to fix it. ;(

Vents

iTrader: (9)

yep.. lazy = bad. mmmmkaay..

Fireball

iTrader: (21)

I have .040 off my 5.3L heads and a 232 cam. I measured PV clearance to be ~.015 before flycutting

Sounds like you made 8 nice valvereliefs

Magnus

iTrader: (4)

Chalk one up as a learning experience.

Sorry to hear your troubles.

99 Black Bird T/A

iTrader: (4)

Never know what you'll get into with the P to V stuff...turned out my 5.3's had been decked before TEA shaved another .015 off. To make a long story short, my car ended up with .075 P to V with a 224 cam!

Best Wishes on getting it fixed soon.

Tim98TA

iTrader: (7)

Damn Terry, that sucks. Maybe you shoulda read an install book before attempting stuff over your head like that.

Tim

robertbartsch

Question:


When I did my H/C swap, instead of measuring with clay, I turned the motor over several times after valvetrain install, by hand using a breakerbar. If I had PV clearance issues wouldn't they be identified using this method?

If I ever do another H/C swap, I will clay it but I thought this was a viable substitute at the time. I realize there would be no way to measure the clearance this way but at least i would know if the valves are hitting the pistons, right?

P Mack

iTrader: (6)

I think the reason you have to have a certain minimum clearance is because at high rpms your rods stretch slightly because of the momentum of the pistons, resulting in less piston to valve clearance. So even if they didn't touch turning it over by hand, they could hit at high rpms.

LS1derfull

This is true, also valves expand when heated as does pistons, this can change static clearance from actual dynamic hot clearances.Cam installed centerline will sway clearances from one motor to the next even with similar specs.

DriveATransAm

so whatd you find out did you take pictures

i have 0.050 off my stock 5.7 heads, 224 cam, and 7.35 rods. i clayed 7.4 rods, but it just cut through...def would have had a problem. i cant imagine running your setup without testing pv clearance! the 7.30 rods might work, or maybe 7.25...hard to say, thats a big cam.