building a sollid roller lt1 and not sure how to install them cam.
I have a cloyes true double roller so i can install it straight up, +4* or -4*.

My question is were should i install it? what are the pros and cons of the different installs?

THe cam is a single pattern, 244 duration, .611'' lift, and a 112 LSA.
THe heads are ported and flow 284 I/210 E @.600
The shortblock for the next year or so is stock, NO MORE THEN 6500 RPM!
Car is a street car, used for autocross and occationally dragracing. I WANT good top end, but NEED good low end. know what i mean? daily driver and all. want good vacume.


Secondary question is with the massive spring pressures, do i need to worry about spinning my cam bearings? should i used maybe thinker oil(sae 30wt) or beef up the oil pump?

 

Actully i was just told its Straight up, +2 or -2 degrees my bad, but still same question

 

you need to install it straight up b/c the opti needs it like that to function properly.

 

straight up, as i am pretty sure the cam is advance ground into it. besides, technically anything chain adjustments you make like that will **** up injector timing(optispark is run off the cam)\


fyi, its gonna rev WAY over 6500.. way.


a similar cam in my 401ci motor was shifted at 7k or a little farther. you are gonna wanna shift at 7k. 6500rpm will be a 500rpm short shift.

 

Ok striaght up it is.

Guess i need to get a new bottom end, stocks not gunna take 7k rpm. thanks ppl

 

FYI the stock PCM isn't going to let you rev over 7k either. I would suggest either a smaller cam or more cubes to keep the RPM down.

 

And you'd like to see 20" Hg correct?
At times it is difficult to have the cake and eat it too. Now, not buying the cow when the milk is free is a good thing but that's another story.

First off, the rpm peak is going to depend on the cylinder head and critical port area. I hate to use these words... but for a "smaller" cylinder port, that cam may very likely make peak power at say, 6700 rpm. A larger port... and the cam makes more hp at more rpm.
You don't mention the displacement, or maybe I missed it but this cam in a 350 should be a 7k shifter. If all is well, it should also make 550 bhp with more than 450 lbs-ft from 3000 rpm on up... preferably more.

Take care

 

550 horse pwer huh? hope so... looking for at least 425 rear wheel altho i have been told more???.

This year i couldn't afford to beef up the lower end yet. So yes it is a low mile LT1 shortblock.
I take my current near stock LT1 to 6500 rpm, and that about what i have heard other people set the rev limiters to on a stock bottom end. I wanna build a very nice 355 shortblock and take it to maybe 7500 or 8k if possible, but i do realize the PCM will not alowthat.
The reason for this post originally was to see if i could move the rpm range down becuz i ken it was a high reving cam


I thought this was actully a "milder" cam then most solids... like durations is 244...same as a hyd cc306 and the lift if not much larger. And solid roller do act smaller then hyd of the same size.

Thanks again for your post, i prolly need all the help i can get

 

Wait a minute are you guys saying you cannot install the lower gear + or - 2 degress??? I dialed my cam in and had no choice but to advance it +2 degrees. Is my car not going to run correctly??

 

why did you have "no choice"?

anyway, it is true it will throw things off, however its hard to say how much it really effects things.

 

well the cams centerline was 110 straight up. and it was ground for 108. What other way could have I corrected it??

 

I would have to disagree with that. If your cam timing is correct then your ignition/injector timing will be also. Unless your dowel pin is not in the correct spot. most unlikely though...

 

The CC306 is 230/244. That intake lobe is much smaller than yours. There are guys with the 306 that rev up to the PCM limit with 350cid.

If you want more low end grunt and not as many RPM, but you are willing to build up the bottom end, then why not go with a stroker? The under 4" strokes should have no problem revving up to 7 grand. Heck, folks drag racing 454s and 502s with 4" strokes have revved over 7k with no problems.

 

But since timing is measured with reference to TDC if your timing reference (opti-spark) is out of sync with your crank (because of an adjustable timing gear or bushed cam dowel) then your timing will also all be off.

This can be compensatetd for with tuning of course, but why do it? Just get the cam ground the way you want it in the first place and have it verified on a cam doctor.


Chris

 

Chuck Riddeck
Progressive Race Engine Development


chuck, i'm new here but your name rings a bell. you wouldn't happen to be the guy who put together phil montgomery's engine would you? I also know a few guys running your cylinder heads, gebhardt, kammes, to name a couple. i'd like to talk with you if you have a spare moment. thanx

Jeff_Belloma@hotmail.com