Trigger finger is itching for one of these cams
TECH Fanatic
Joined: Jan 2010
Posts: 1,219
Likes: 0
From: Euless Tx
Good choice man. Good luck with it. I put a Trex cam in mine first and I thought I was clear. Got really close at .53. Fortunatly just at idle the first day I had a lifter tapping. Pulled the heads, and saw little marks on every piston where the exhaust valve was hitting. I took a step down to the RapTR and I am very pleased with the performance. Have fun.
Thread Starter
11 Second Club
iTrader: (24)
Joined: Mar 2008
Posts: 2,554
Likes: 2
From: North East, MD
Good choice man. Good luck with it. I put a Trex cam in mine first and I thought I was clear. Got really close at .53. Fortunatly just at idle the first day I had a lifter tapping. Pulled the heads, and saw little marks on every piston where the exhaust valve was hitting. I took a step down to the RapTR and I am very pleased with the performance. Have fun.
What clearance did you get with the RapTR? Any numbers with it?
TECH Fanatic
Joined: Jan 2010
Posts: 1,219
Likes: 0
From: Euless Tx
Sorry man, I was off a bit. .103 on the exhaust, and .124 on the intake. Preload was right at .100
I have 2.055 intake valves and that cam would not fit in my combo. The most we could fit was a 230 / 242 615 / 615 lift on a 116 and 60 thou head gaskets . Geoff at EPS worked the numbers for me.
Thread Starter
11 Second Club
iTrader: (24)
Joined: Mar 2008
Posts: 2,554
Likes: 2
From: North East, MD
Here is a procedure:
http://www.diyporting.com/PVC.html
We will check it as best possible. Looks like the exhaust is more of the issue.
What's min numbers? Seems it varies according to who you talk with.
Did you do any measurements with clay or valve drop?
Here is a procedure:
http://www.diyporting.com/PVC.html
We will check it as best possible. Looks like the exhaust is more of the issue.
What's min numbers? Seems it varies according to who you talk with.
Here is a procedure:
http://www.diyporting.com/PVC.html
We will check it as best possible. Looks like the exhaust is more of the issue.
What's min numbers? Seems it varies according to who you talk with.
I brought Geoff my heads and he pulled two springs off and measured the distance it took for the valve to stop laying it on a flat surface. He took that info and compared it to a stock head. I see you cant do that so double check that cam in your motor because its going to be tight.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo Thread Starter
11 Second Club
iTrader: (24)
Joined: Mar 2008
Posts: 2,554
Likes: 2
From: North East, MD
Not on my particular head but Patriot did do a drop test yesterday on another set of heads just like mine and I had the stock .158" spec Thunder supplied for stockers. I can do my stockers again just to verify.
What did you have for drop numbers?
What did you have for drop numbers?
Do things right and measure your PTV clearance with a checker spring. You don't need to pull the heads at all, just a valve spring. Which you will have to reshim your springs for a new cam anyways. I really do no think that cam is going to clear but hey good luck. With my 224 cam, .051" gaskets and .020" worth of milling on stock 243 heads I only had .068" intake valve clearance at 10 degrees BTDC. Stop throwing parts together and do things right. Scrap those heads, they don't work on your setup... A low compression 2.05" valve setup is not what you need.
Do things right and measure your PTV clearance with a checker spring. You don't need to pull the heads at all, just a valve spring. Which you will have to reshim your springs for a new cam anyways. I really do no think that cam is going to clear but hey good luck. With my 224 cam, .051" gaskets and .020" worth of milling on stock 243 heads I only had .068" intake valve clearance at 10 degrees BTDC. Stop throwing parts together and do things right. Scrap those heads, they don't work on your setup... A low compression 2.05" valve setup is not what you need.
I would definitely measure with a checker spring...
also that is with a 2.00 valve too...
going from 2.00 to 2.04 is around .005 less clearance
