Blow03SS

iTrader: (2)

Just installed the Futral F13 cam with standard 7.4 pushrods, wondering if 7.425 would quite the valve train down some. Im using the Patriot Dual spring set up and the motor is a standard LS6 motor all stock. Any have any luck with this?

BTW I know how to check for proper PR length just hoping someone had some luck with this to save me some time. Thanks

Phil'sC5vette

iTrader: (4)

Redlinez

iTrader: (5)

Most recommend the 7.40 length. That's what I'll be running with my Futral cam.

socmguy

iTrader: (18)

I've heard some cams like the lingenfelter performance have a smaller base circle on the lobes so longer PRs are needed but I don't think the futral cams are like that. If getting rid of the sewing machine sound is what you're looking for you'll have to upgrade rockers.

Blow03SS

iTrader: (2)

Well its damn noisy thats for sure and sounds like ****. I had heard a few people running the f14 went to 7.425 and it worked out good for them, so just wondering if that would be good in my case? I know the PRC springs are loud but damn

JPH

iTrader: (2)

call and ask allan, i'm sure he will tell you. 7.400 should be fine. aggresive profiles, mean noise.

mvvette97

iTrader: (18)

Comp also has the smaller base circle on their cams. My 228 is .040 smaller than the stock cam. I really need the 7.440 but since they don't make that size I went with the 7.425

Blow03SS

iTrader: (2)

Its only a $100 to see if it quites down and if it does not work then I will sell them here. I just hoped someone was running just a cam in a stock motor and used 7.425 to see what happen.

Phil'sC5vette

iTrader: (4)

really it depends alot on if your heads are milled.
if they are not the 7.40s should work

GuitsBoy

iTrader: (4)

Stock PRs are actually 7.380 not 7.400, so you make up .020 difference there. Going to 7.425 would put you within .005 of stock preload (below stock). Or you could mill the heads .030 and be spot on

Im running 7.400 PRs with heads milled .040, which puts me .010 over stock preload, and im very happy with the valvetrain noise.

ISeeRed

iTrader: (1)

I just put a Lingenfelter cam in my car with LS6 heads with LS1/2 Valves. The base circle on the cam IS smaller and I used 7.425" with the new YT's. Not a sound....It's super quiet.

On a side note if you have LS6 valves they are .6mm longer and should not need anything other than the stock 7.400". (Unless of course your heads are milled or you went with a much thinner gasket)

AFTICA

iTrader: (8)

I have a F-11 in my otherwise stock 98. First put it together with 7.40 pr's because that's what everyone recommended including Allen. It was noisey. Changed to 7.425 pr's and it's almost as quiet as stock.

Blow03SS

iTrader: (2)

Thats what Im talking about! SO you went with what everyone said and then you just tried a set of 7.425's and it worked out for you. I think I will try this out. What springs are you using?

theinstag8r

iTrader: (3)

7.425 will quiet it up.i had a car with a f-14 and needed longer PR. all is well now

AFTICA

iTrader: (8)

Logic told me to use longer pr's because of the smaller base circle of the cam, but I listened to Allen and put the 7.4's in. With the SLP dual/dual exhaust my car is fairly quiet and the clattering with the 7.4's annoyed the **** out of me, so for the little bit of money involved I made the change over to 7.425's. I'm using CC 918 springs from a few years ago, not the ones that are having problems now.

Blow03SS

iTrader: (2)

From looking at your set up you are running pretty much the same thing I am running. This car sounds like **** now that I put the cam in and it makes tons of noise that should not be there, Im going to give the 7.425's a shot. I had a HUGE cam in my 408 SS and that Xer lobes and this car is just as loud, something is not right here.

So nobody has said for sure if Allan's cams have smaller base circle's?

theinstag8r

iTrader: (3)

the base circle of a f13 is 1.450. which is the same as a f-14. I believe stock is 1.553.

Blow03SS

iTrader: (2)

If thats the case then why would you not want to run the longer rod to make up for the base circle? Thanks man

Evans752

iTrader: (29)

The cams are hydrolic lifters (stock) and the 7.40 are a hair noisyer but car will run better with the 7.40 (looser) but you will get a little more motor noisy but you dont want a stock car when you put a performance cam in a car. I run 7.40 in all the cars that I have done unless they start decking the heads or the block. My set up in my car is a Stock LS6 with stock heads and makes 456 rwhp and went 11.13 at full weight no weight reduction before Fast 90 intake that was with LS6 intake and MTI Throttlebody at Einglishtown NJ. Good Luck

Redlinez

iTrader: (5)

Allan just told me no problem running the 7.425 and it will be quieter on stock lifters, so I guess I'll go that route.