E-303 idles mean as hell I thought it was a mild cam.

[420nitro]

Originally posted by Hozer 88GTConv
good catch...
b-cam 480-480 224-224 110 LC (1.6's)
with 1.7's becomes 510...damn that's close on TF heads and Flat tops...
I think the f is 512 though? Pretty close though....

Isn't the b-cam a 112 LC & the e-cam a 110LC?

[Hozer 88GTConv]

you made me look it up to be sure...
bcam
480-480 224-224d 107-117 lc
ecam
498-498 220-220d 110-110lc
fcam
512-512 226-226d 109-109lc
xcam
542-542 224-224d 107-117lc

I read for guys with flat tops and non-stock valve angles, you can go as high a 535 and 230 duration and be okay.
But any duration over 230 becomes hard to tune for streetability (read daily driver)
I would be interested in hearing from guys with moderate lift cams over 230 duration to get some tips on tuning.

[sedanman]

Where did you get the specs on the F cam? I heard it was a 112 LSA?

[Hozer 88GTConv]

http://www.mindspring.com/~steveflyer/engine.htm
and the racer walsh catalog to be sure.

[sedanman]

Thanks, for the link to the specs and that is a very nice website.

Thanks.

[fiveOguy20]

since u have nice heads an intake an ur gonna go with alph, cam i woulda went with X or Z far more performance than the rest especially with good flowin heads.. just my 2 cents

[Dark_5.0]

I dont have the clearance to run much of a a bigger cam. .530 is my limit

[68Falcon]

I run a Lunati Cam. It has .526in .530ex lift. and 221in 232ex at .050. 111 Lobe Separation. Its a really good cam.

[Dark_5.0]

I am surprised you can run that much lift with 49cc heads.

[68Falcon]

I check pistoin to valve and I promble could get a little more lift. The block is undecked. With those heads i have 10.5:1 compression.

[blue oval 50h]

lift has very little to do with piston to valve clearance. Its the duration.

The size of the chamber in the head also does not determine piston to valve clearance-(as long as head hasent been shaved)

I also agree you couldve went with a much better cam then a e-cam for your combo. 3 things in combo i would change. Cam, 70-75mm t-body, long tube headers

The alphabet camsare outdated, and if another combo made 330rwhp, definatly does not mean yours will.

[sedanman]

Originally posted by blue oval 50h

The alphabet camsare outdated, and if another combo made 330rwhp, definatly does not mean yours will.

True but there are a lot of guys going insane fast with them too. I hope to be one of them! Hoping for 130 traps with a F cam.

[blue oval 50h]

Hoping for 130 traps with a F cam.

imagine what a custom grind would do for you

[sedanman]

Originally posted by blue oval 50h
imagine what a custom grind would do for you

Probably crack the block

I have a B41 from anderson that I won't put in because of PV and the fact that the block would be history. I am hoping to have the new block before this one dies now.

[Dark_5.0]

Originally posted by blue oval 50h
lift has very little to do with piston to valve clearance. Its the duration.

The size of the chamber in the head also does not determine piston to valve clearance-(as long as head hasent been shaved)

I also agree you couldve went with a much better cam then a e-cam for your combo. 3 things in combo i would change. Cam, 70-75mm t-body, long tube headers

The alphabet camsare outdated, and if another combo made 330rwhp, definatly does not mean yours will.

He said he had 68 302 heads so I knew they had been shaved cause I know they didnt come with 49cc chambers.

I am not worried about the performance of the e cam. After I get all the bugs worked out I fully intend on spraying this motor till I kill it and then throwing a 351 in there.

[Skyman]

If lift has nothing to do with the PV clearance, why is it ever head manufactuer gives a max lift for their heads? Im not cam expert, but it doesnt matter how long a valve is open at a certain lift, just how high it is to hit the piston.

its funny how people all scold you for using the E-cam because you could have got something that made better power, but if you were using the stock cam that would make less power you would probalby not be scolded at all...

Skyler

[420nitro]

Lift is an important on P/V clearence. But not the only consideration. You can put in a smaller lift cam in then before and still hit the piston! L/C and duration also plays a large role if not more then just LIFT. Specially if you go from let say a 114 L/C to a cam with lets say...a 108-or even a 110.
As goes for the Manufacture saying max. lift does not indicate possiable P/V clearence problems. All that means is that the stock valve springs that come that head will have coil bind issues, not to mention other problems. You should always check P/V clearences when swaping cams too. But **** happens and I know.
As goes for custom grind cams...I always try to use them for varies reasons but sometimes off-the-shelf cams suit your needs just fine too.
MY .02

[Dark_5.0]

Well all I know is the clay I checked piston to valve clearance with tells me I have .530 of piston to valve clearance on the intake side.

I may change to a split pattern cam and run a bout .515 lift on the intake and .530 on the exhaust.

I have also thought about putting 1.7 rockers on the exhaust valves to get .529 lift on the exhaust valve.

Although not ideal with a little bit of spray I should be able to line up with the big boys.

[420nitro]

[QUOTE]Originally posted by Dark_5.0
[B]Well all I know is the clay I checked piston to valve clearance with tells me I have .530 of piston to valve clearance on the intake side.


Wow thats alot of clearence! Or did you mean thats how big of a cam you could of used?
As goes for your combo....just run it! The only thing is that, don't expect to pick up alot on spray. But should go pretty good on motor. All I was able to pick up was 7 tenthes on a 150 shot. Went faster w/ a b-cam but slower on motor. It was ok...the way I wanted it.

Oh yea, did you ever find out what was up with your vacuum????

[Dark_5.0]

Yeah the lower intake was leaking where it meets the heads. My GT-40 lower is ported and doesnt leave a whole lot of surface arear to get a good seal. I went to a Felpro 1262 gasket I will put them on tonight and get that taken care of.

I meant thats how big of a cam I could use.