i just purchased some Type-B's and on the Instructions it says clearly DO NOT Use with Oversized Valves. Just wondering if anybody has ever done it?Is it safe or your guys dont recommend it?? i dont want to buy a new head. Money is tight right now...


This is my set-up

B20b Block stock sleeves
84mm
Cp 12.5.1 Pistons
Total seal rings
Eagle H beam rods
Arp Head Studs
Arp Rod Bolts
Oem Type R oil pump
Oem Water pump
Oem Timing Belt
Golden Eagle Vtec line (-4)


LSD 4.7 Tranny

B16 Head
5 angle valve grind intake
3 angle valve grind exhaust
Port an polished
Crower valve springs and retainers
Titanium valve guides
Ferrera 1mm oversized valves
BLOX Type B's Camshafts
AEM Tru Cam Gears
Benen fuel rail
440cc injectors
VicktorX manifold
Skunk2 TB 68mm
Head was Milled Thirty thousandths 0.030
Bisimoto V2 Prototype Header B series

 

Ive tried the search box and some have said they ran 1mm oversized valves with big cams no problem. some say they valves are going to hit each other a can damage the motor. im confused!

 

You can run oversized valves with any cam but you have to take the time to check your V2V clearances at different cam gear settings and that will require you to remove the head or use another spare head to see what you're dealing with.

 

i was running Buddy Club Spec IV's with the same head with no problem. I just wanted to try some different cams. Its just that Blox recommends not to use it with oversized valves. Are both Cams that much of a difference? im trying to avoid removing the head...


BLOX B's
INTAKE: Duration: 266° @ 0.050 INCHES Lift: 0.489 INCHES
EXHAUST: Duration: 266° @ 0.050 INCHES Lift: 0.472 INCHES


BUDDY CLUB SPEC IV's
1mm OPEN
1mm OPEN
INLET
37° BTDC
49° ABDC
306°
12.3mm
0.007

1mm OPEN
1mm OPEN
EXHAUST
61° BBDC
21° ATDC
302°
11.8mm
0.008

 

00Red_SiR Thanks for your input bro! Your always helping me with my dumb question threads! hahhaa...

 

lol, no problem. The blox B's are the same as the skunk tuner 2's and most cam companies will say not to run their cams with larger valves just to play it safe as most people don't check clearances. When I checked my V2V clearance with my Rocket M22x cams, I had no clearance issues at any settings but I also have stock valves. If I was running 1 mm oversize valves on the intake, it should reduce my clearances by about .020 which I still don't think (If I recall correctly) would have been a problem. If I was/you are, running 1mm larger intake and exhaust valves, that would make things significantly tighter and I wouldn't feel comfortable running and adjusting your cam gears without checking the clearances first.

 

AFAIK the Blox B has a similar high cam profile to the BC IV cams so you shouldn't run into much of a problem, but as always checking the clearances is the best idea.

 

yes they are slightly different. im just going the go the safe route and have my mechanic check the clearance. i dont want to the valves to slap. too much money invested...
thanks for the input

 

IMO if you want to try something different go with the Skunk 2 Pro cams or another BC cam, The Blox cam is a step down and will feel really sluggish in the mid-range.

 

worked on my setup for like 5 years...used omni over sized flat face valves on this setup with RS ITR cast pistons...no piston-valve slap...did i mention mad torque???

 

this dyno sheet has been hoar'd around so much on this site that I think I just got syphilis from seeing it again...lol

That sheet is a great build result but is a result of a good part combination, good assembly and tune that work very well together. It cannot be randomly thrown up on a thread like this to say "see Blox cams work! just look what they did on my motor". It's very misleading and does nothing to help the person asking the original question.

 

you're right...sorry for whoring out my dyno sheet again...i just miss driving the motor and the hatch...brings back memories...btw, i got away with flat faced over sized valves cuz motor was built with 3 head gaskets ;-)