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Author Topic:   Cam clearance Questions???
Speed Racer X
Dirt Full Roller

Total posts: 61
posted January 16, 2003 09:16 PM
Has anyone had any cam clearance problems on a 6" rod 383 Chevy. My machine shop suggested we use a small base circle cam, but those seem to be more expensive. I called Speedway Motors and they said there were no clearance problems with their "Tight Lash Series". We just bought new rods and don't want to start grinding on them. What do you guys think?? Thanks in advance.

sdhnc29
Dirt Freak

Total posts: 467
posted January 16, 2003 11:57 PM
Number 2 and 6 rod will sometimes touch the cam . Either use a stroker rod , or remove a small amount of material from your existing rod's .

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780

Speed Racer X
Dirt Full Roller

Total posts: 61
posted January 17, 2003 06:31 AM

Thanks for the reply "SDHNC29". We are using Eagle #SIR6000BBLW rods. We have been lead to belive that they are stroker clearenced, do you have any experience with this product? Thanks again!!!

sdhnc29
Dirt Freak

Total posts: 467
posted January 17, 2003 11:52 AM
Sorry I don't ,I will not use any Eagle product . I've seen too many cracked rod's over the year's . Perhaps someone else on this board could advise you on the Eagle rod clearing your cam .

Steve

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780

awkwardjeff
Dirt Freak

Total posts: 458
posted January 17, 2003 06:44 PM
I know Steve doesn't like Eagle products....and more then likely for good reason.....LOL I Never ran a eagle rod...here is what I would do.....put the number 1 piston and the number 2 and 6 pistons in the block.......degree the cam, then use a feeler gauge.....I won't run a motor with less then .080 clearance between rods and cam...... with the motor on the stand tip it over and start turning so you can put that feeler gauge on the rods roll the motor over 2 full revolutions.......making sure you got .080 clearance.........if not you will need to gain some clearance....and by this time the rods and crank are balanced.....so then the small base circle is you best resort.....

I like Steve don't LIKE the small base circle cams.....but some times you have too... the small base cirlce will deflect and flex......thowing cam timing off.....then you honestly should run a direct oil lifter.......it has a .023 hole in bottom of the lifter to oil the cam...because the small base cirlce the surface area that the lifter rides on is much shorter now........it does NOT get rid of heat very well......... and to keep deflection and flex down.......you start with a billet core.....to grid the cam.....

If you want to keep the thing alive and make power these things cost money.......the lifters are more than regular lifters...but it's for the life of the motor...good investment...........billet core....is for cam timing....for making power., good investment........every seen a motor after the cam broke first???? UGLY........

That is why NEXT time make SURE you start with a stroker rod..........

I got a 406 with aluminum rods....and the rods are sooo big it only has 2 pan bolts on each side.......plus the 4 corner bolts...what you think that's got for cam and lifters????? and I still needed to mill off .100 on the tops of the rods......But it lived many nights already.........If I would have skimped here and there it would have punched a hole it that fancy pan by now.

It's a special cam.......I called Dave Crower and talked directly to him....many times over the years........costs more up front.....but in the long run I believe it's cheaper........ Just give Crower a call and they will help you and NOT over sell things you don't need.

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