Is the only difference in a roller cam 302 block and a non-roller block the cam that's installed? in other words are the cams interchangeable between the two and what really makes it a roller or non-roller is the cam that's in it?
Printable View
Is the only difference in a roller cam 302 block and a non-roller block the cam that's installed? in other words are the cams interchangeable between the two and what really makes it a roller or non-roller is the cam that's in it?
The short answer is no. A roller cam takes roller lifters and a mechanism to keep the roller lifters from rotating in the bores.Quote:
Is the only difference in a roller cam 302 block and a non-roller block the cam that's installed?
But any motor can be made roller right? With the right cam, lifers, rockers, etc.??
At what point is a must? Above a certain RPM range?
jb
that's what I was getting at... if i'm going to use a new cam, lifters, heads, & valve train, are the blocks interchangeable? For my purpose, i can go with forged or the hyper pistons so i'm ignoring that difference for the moment.
I'm not totally sure either, to be honest. I'll be keeping an eye out for the answer too!
rf....
Dont quote me but i beleive most blocks are interchangable. One of the things a roller block needs is a housing or recess to slide the lifter plates into. which can be machined
The block will have to be machined. But it is not that big a deal.
I personally would go with a roller cam and the forged pistons.
i've never had any machine work done to put roller lifters in old blocks before . :confused:
Me either, Denny.
You will have to run a small base circle cam
to which you will have to drill and tap the block (Machine shop)
Or run the crane reto-fit lifters ($400.)
OK, i'm confused now Denny and Mike, lets rephase that question a bit.
:HMMM: Can you put a late model chev roller cam and lifters into the early 1955 - 1986 1st generation blocks ?
Awaiting your awnsers with many thanks. Mike (S)
"this is a roller cam, dont see where you have to do nothing but put it in."
Part Number 12-705-8
__Engine 1955-1998 Chevrolet
262ci-400ci
8cyl.
Grind Number CS 300A-R10
Description
--------------------------------------------------------------------------------
Intake Exhaust
Valve Adjustment 0.02 0.02
Gross Valve Lift 0.575 0.575
Duration At 0.015 Tappet Lift 300 300
--------------------------------------------------------------------------------
Valve Timing At 0.015
Open Close
Intake 44 76
Exhaust 84 36
--------------------------------------------------------------------------------
These Specs Are For The Cam Installed At 106 Intake CL
Intake Exhaust
Duration At 0.05 255 255
Lobe Lift 0.3833 0.3833
Lobe Separation 110
--------------------------------------------------------------------------------
Recommended Valve Springs 977-16
this is just lifters, but they do talk about "including small base circle and offset applications." must be 1996 up maybe. MIT QUK explane the small base circle if you will.
i think he is talking about a 302 ford anyway.
Chevrolet V8 265-400 1965-1996: The best all-around lifter available. Perfect for any application wi
PART #818-1
$25.86
Quantity:
None in your basket
DESCRIPTION:
Endure-X Solid Roller Lifters
For years COMP Cams® Super Roller Lifters have set the standard for solid roller lifter technology. But today’s engines place a greater demand on lifters, unlike ever before. In keeping with the heightened requirements, COMP Cams® has not only changed the name of this industry standard, but more importantly enhanced its durability with a series of innovative upgrades.
Most significant among the upgrades is the addition of EDM Oil Injection™ technology which ensures the bearing assembly receives a constant flow of pressurized oil. Unlike other lifters that offer pressurized oiling only as an upgrade, EDM Oil Injection™ technology is included standard in every Endure-X™ Solid Roller Lifter. This virtually eliminates needle bearing oil starvation, historically a “problem area” for solid roller lifters when used in low RPM and street applications. To further strengthen the bearing assembly, the Endure-X™ Solid Roller Lifters also include needle rollers that are precision sorted by size; evenly distributing loads to avoid premature wear and failure.
In addition to the new upgrades, all Endure-X™ Solid Roller Lifters still contain the features that made them the “preferred choice” among performance engine builders. Every lifter is fully heat treated, machined to ultra-high tolerances and fully rebuildable. The COMP Cam® patented link bar assembly blends all the advantages of a removable link bar, with the safety of a captured link bar. COMP Cams® Endure-X™ Solid Roller Lifters are available for a variety of applications, including small base circle and offset applications.
Quote:
Originally posted by rficalora
302 block
key word
i'm talking chevy. i dont know what everybody else is talking about, so just forget anything i said. :confused: southerner made me do it. :LOL:Quote:
Originally posted by MIT QUK
key word
Come on everyone knows that anything chevy ever made will fit in a sbc and you can rebuild it for $ 36.27.**) :LOL:
chevy. is trying to mix it up a little lately. and that $36 is up to $50.00 now. :CRY:Quote:
Originally posted by MIT QUK
Come on everyone knows that anything chevy ever made will fit in a sbc and you can rebuild it for $ 36.27.**) :LOL:
:LOL:
:whacked: WEll .............. whatayaknow, I read the small print at the top of the thread FORD I assumed he was talking 302 small block chevy. Sorry about that.:rolleyes:Quote:
Originally posted by lt1s10
i'm talking chevy. i dont know what everybody else is talking about, so just forget anything i said. :confused: southerner made me do it. :LOL:
i was thinking chevy. to. all this and we still dont know what "small base circle " means. :HMMM:Quote:
Originally posted by southerner
:whacked: WEll .............. whatayaknow, I read the small print at the top of the thread FORD I assumed he was talking 302 small block chevy. Sorry about that.:rolleyes:
Roller blocks have taller lifter bores to fit the OEM roller lifters that are taller than flat tappet lifters. If you get a early block you need to run a small base circle cam so the lifters will be far enough into their bores to stay stable.....or you run the link bar lifters.
Yes, indeed, You have that correct. Although several manufactures make a retro kit that uses Ford style roller lifters and a spider to keep them located on the smaller base circle cam and they only require the drilling and tapping of two holes.Quote:
Originally posted by MIT QUK
Roller blocks have taller lifter bores to fit the OEM roller lifters that are taller than flat tappet lifters. If you get a early block you need to run a small base circle cam so the lifters will be far enough into their bores to stay stable.....or you run the link bar lifters.
The sbf has not changed much over the years in overall design but some but there are some small changes to be aware of. If you are comparing early to late the 2 blocks are slightly differant, and there are some modifications that cant be done to early blocks that are used in the late model vehicles, such as: late model blocks used in computer controlled vehicles have a boss by the bell housing that is used to hold a knock sensor which automaticaly adjusts timing when the engine starts to ping (please bear with me the years im going to use will be close but not be right on the money, been a while since I worked at the engine shop :D ) I believe that the knock sensor boss was put into effect in 1985. also early blocks used a 2 piece rear main seal so the crank shaft and block were differant between early and late model I believe the full round rear main seal went into effect in 1980 and also the provision for putting the dipstick hole into the block came about in the same time frame.Quote:
Originally posted by rficalora
Is the only difference in a roller cam 302 block and a non-roller block the cam that's installed? in other words are the cams interchangeable between the two and what really makes it a roller or non-roller is the cam that's in it?
The roller block has 2 holes drilled into the valley to hold down a plate with fingers that hold the retaining clips which keep the roller lifters from being able to spin. If you compare late model to late model roller versus non roller the blocks are identical.
That may have been more than what you are looking for but there it is :D .
NB
The lifter bores in a SBF roller block are cast taller than the early flat tappet blocks. The tops of the bores are machined flat and the dogbones are held down against it with a spider. The spider is held to the lifter valley with two small bolts.
You can add a roller cam to a non-roller block by using one of the roller lifter sets with the link bars. Another option is to use a roller retrofit kit but these use a small base circle cam to make up for the shorter lifter boors.
http://www.tffn.net/albums/album09/Lifer_Side_View.jpg
--Patrick