cmack

I am building a 383 for my 1983 camaro i have cleranced the block for the crank and the rods but when i installed my cam number 1 and 5 connecting rods hit my cam i was wondering if anyone has experanced this and any advice you cound give me thanks

305sbc

iTrader: (3)

http://www.carcraft.com/techarticles...y_stroker.html

jjlabinski

Yeah you have to use the small base circle ground cam. requires different timing set as well

cmack

i was told i could grind my rods by my local machine shop to clear the cam as long as it is balanced after

Apeiron

It depends how much you're taking off, and where. Usually it's the shoulders of the rod bolts that need to be clearanced, and they're iffy enough strength-wise even before you start grinding on them.

Did you install the cam before or after the crank and pistons?

Apeiron

It does?

cmack

i installed the cam before the rods i also have arp rod bolts not studs and nuts

Apeiron

Which rods are you using then?

kowboy59

iTrader: (8)

never had to clearance for my cam. weird. and no you do not need another timing set. double roller i suggest f you dont already have one

jjlabinski

I forget the exact difference but much to my surprise a few years back there is a difference. I could go look cause I have both cams but I think the bolt pattern is different for the small base circle cam or it had to do with the back face. I could look next time I go outside.

Air_Adam

There shouldn't be any difference in the timing set, as the only thing different between a generic cam and a small base circle cam is that the lobes are smaller. Timing end of it is the same.

Apeiron

There isn't, and it's not.

ssean92

iTrader: (10)

I used a small base circle cam, well after the rods took out the cc306

creese187

yeah, i would look into the small base circle cam, i have a 383 small block, with a .600 lift cam, and even with the huge eagle h-beam rods, i still had plenty of clearance, call comp, that what cam i have, they should set you straight

Apeiron

It's the duration that causes more problems than the lift.

pwdbychevy

Yes I had the same problem and my heart sank and I broke out in a cold sweat when it happened. I ground down the rods a little to clear. Here are the before and after pics.

Air_Adam

The only way I can think of there being a difference is if one was drilled with the pre-roller-block bolt pattern, and one was drilled with the GM-roller-block bolt pattern, as I think the GM-roller-block timing gear bolt pattern was slightly smaller on the camshaft, because of the retainer plate IIRC.

I could be wrong about that, I`m not 100% sure here. I remember hearing about that somewhere a few years back. Has nothing to do with whether or not its a small base circle cam though.

GICATA

This is the same action I took in my 406. 270 Comp cam, Eagle 5.7 inch I beam rods...a little grindage and no more rubbage. 36,000 miles no problems.