Rev kits for SBC?

I am not sure why they are really used and wher would I be able to get another set of push rods? One of mine is bad but I imagine i will need to buy another set. Anyhelp will be good thanks.

 

I think that you are sayin' that you need one pushrod that is real short because of the rev kit.
Rev kits help control the lifters if the valve springs are not strong enough. With todays springs rev kits are not used as much as "in the day"
PM me with a length. Maybe I can help you.
Smokey

 

Isky made the origional rev kits. I've also seen AFR with rev kits.

 

With the rev kit you can use lighter valve springs. Had one in a 301 using a Isky 550 Legerra roller cam. Would turn 8500 with no sign of float with only 160 lbs seat pressure. Wish I still had it.

 

I will post pics of it so that way you guys can see what I have andd what I need. Thanks so far .

 

I've got a rev kit in my roadster with a roller cam and it uses stock length push rods.

 

Yeah but the ones I got have an area that is notched where the keepers go. This is were I am not sure . I need one with this notch in it .

 

It sounds like an old Crower or Isky kit. You're saying that the spring rides on the pushrod (and the rev kit plate) rather than the lifter body and the rev kit plate?

 

If your lifters look like this you are lucky enough to have some cool **** !! As these are from Isky and they take a lot of weight out of the valve train. as you can see the lifter is quite a bit longer in overall length and this shortens the push-rod which saves weight. The push-rods are about 1 and 1/8th" shorter than the stock chevies as we always measure the push-rods and fit them to the particular engine. This push-rod is 6.700 and a stock chev is 7.800. But if it's just push-rods you need simply take the old ones and measure them to get the replacement length. Or to check the proper length install the rockers and open the valve to half of it's maximum lift and at this pont the roller on the rocker should be in the center of the valve tip. Hope this isn't too confusing. If so send me a pm as I probablly have what you need >>>>.

 

I agree with Homespun91. What cam,etc are you usin'? Is the rev kit really needed? How old are the lifters? I would try to get away from that old kit and use the proper valve springs.
Smokey

 

This is what I have.

 

Man that is some ancient **** and kinda cool. Problem will be if you need replacement push-rods your going to have a hard time finding them with a thick enough wall to cut the groove in for the keepers. Trial and fit might be the method to use as those actually look like stockers. That stuff kinda looks homemade too as the race cats from the old days were quite the inventors >>>>.

 

Yeah my purshrod measures 7 7/8 on a tape measure.

 

probably goes with those cool roller lifters that are held in place with a piece of square stock thru the oil galley...i have a big and small block setup ....both are plate types.....the crazyness never stops with the old stuff....

 

Racer Brown made the first rev kits...

 

Not to high jack this thread.

Isky -first to apply for a patent on an "ULTRA REV KIT" according to the website. Cool history on both cam grinders!

 

OK. That is the type of kit I was referring to in my first post. As I mentioned, both Crower & Isky made kits like that (maybe others as well). I don't know about Crower, but Isky has been known to keep old inventory in stock for years after it's been formally dropped from the line. If you can get a name off the head plate, that would give you a start...or do the springs just ride on the bottom of the cylinder head?

Otherwise....
As Engine Pro said, it will be difficult to find pushrods that have heavy enough walls to allow that kind of a cut. Trend or Manton can probably custom make something...but the cost will likely be high enough that it would be cheaper to:

A) Get modern springs, new off-t******lf pushrods, & junk the kit.

B) Get new off-t******lf pushrods and a modern rev kit, if you must.


At this point I question how much additional pressure you are gaining from the kit & springs, given their age & the spring quality of the time.

While we're on the subject of ancient valvetrain technology, anybody remember straddle rollers??

 

"Straddle Rollers" what do they look like

 

well?

 

the sides of the lifter extend down past the roller wheel to hold the lifter straight......

 

What he said. ^^^^^^^^

They had very narrow cam lobes, like 3/8" inch, tiny rollers, and as Brandon said, the lifter body "tabs" hang down way past the wheel & straddle the cam lobe. No guide bars, keys, or anything else.

Dunno whether they died off from the profile limitations, or the carnage that resulted when the frickin' tabs would break off...and, they did.

 

Mine don't look like that. But I found another pushrod and ***embled the enging today. This is my very first build. I will post pics of the complete engine when I finish detailing it. I will also try to record it when we start it up for the first time. Wish me luck.

 

Do you have a year on when they came out? Isky had them in 59 and were listed as patented by 60. I thought RB was first but Isky, RB, and Potvin were all within the same time frame with the rev kits... What is the site you found? Thanks