|07-28-2012 02:54 AM|
0.080" on the intake and 0.100" on the exhaust is considered by many to be a good safe clearance. You will probably find the closest near-miss at the exhaust valve on overlap, when the piston is chasing the exhaust valve back onto its seat.
|07-28-2012 02:40 AM|
Thats great info. That is a good plan. Is it super critical to use a solid lifter for mock up?? I guess I can probaly just buy a couple of solids instead of a hole set. Also what is minimum VTP clearance?
Is there a cam manufacture in particular that sells a "street" solid roller and lifters??
|07-27-2012 09:26 PM|
|hpete||That seems like a lot of cam for a stock bottom end.|
|07-27-2012 07:44 AM|
Agreed, can't really tell anything without mocking it up. Too many variables.
However, it's not THAT big a "deal" to have the valve reliefs "fly-cut" (type of cutter used for the operation). Any automotive machine shop that has a "piston vise" and a mill can do it. This is the procedure to be used when cams and pistons not "stock" are used. Common practice.
|07-27-2012 05:32 AM|
Here is a page on things to check.
Stock piston valve reliefs need to be checked and clearanced if needed w/2.02" intakes. Aftermarket pistons tend to have more generous reliefs.
|07-27-2012 02:29 AM|
safer is better
when i doubt go to a place like howards cams or elgin or something and buy a cheap solid cam with close to the same numbers...may be impossible when comparing to a roller but its worth a try. most solid lifter stuff is 90 bucks from them. Or as an alternative. check with some local dirt track guys and see if they have a comparable one laying around you could use to test. Us dirt guys never get rid of anything.
|07-27-2012 12:01 AM|
|prostcelica||I'm going to use either AFR 180 street or patriot freedom series 185. I was hoping to use a comp XE288 or XE 294 hydraulic roller. I would attach the link on the cams but I'm posting from my phone so I hope that helps. The only cam I have is a flat tappet magum 270. its 224 at .50|
|07-26-2012 10:39 PM|
|prostcelica||Hmmmm. I was planning on checking clearances but I'm worried about buying a $300 cam and not being able to use it.|
|07-26-2012 09:16 PM|
There's no way to know and nobody can tell you rather or not your going to have clearance issues you have to check it and there's no way around it.
A cheap method we use is play dough with talcum powder to prevent the valve from sticking.
|07-26-2012 08:58 PM|
|vinniekq2||That cam though not high lift,likely wont fit.depends also on duration and lobe angle.always check clearances|
|07-26-2012 07:54 PM|
I have a stock SBC 350 bottom end. I am going to be putting some aluminum heads, roller cam, intake etc.
My question is how much valve lift can I get away with before running into valve to piston issues??
Stock flat tops with with 4 eyebrow valve relief, .025 deck heigth, .015 head gasket.
I heard you can run into issues with the eyebrows being to small to accomodate 2.02 valves??
Any input would be great. Thanks in advance.
PS: cam I wont to use has following lift......int .54 / exh .562