Retrofit Hydraulic roller cam in roller block?
#1
Junior Member
Thread Starter
Join Date: Mar 2007
Location: South Fl
Posts: 40
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Iroc-z
Engine: 396 Stroker 625hp
Transmission: 700r4 3000 stall
Retrofit Hydraulic roller cam in roller block?
I am looking at the comp thumpr series camshafts, but they only make them in retro fit applications. Is it possible to put one of these cams in my origianlly equiped roller block, what would I need to do?
#2
Member
Join Date: Mar 2007
Location: knoxville tn
Posts: 139
Likes: 0
Received 0 Likes
on
0 Posts
Car: camaro
Engine: 383
Transmission: 350 turbo
Axle/Gears: 3.42
use a cam button instead of the thrust plate that bolts on the block. use a timing chain for and old model block. thats it.
#3
Call Comp Cams and talk to them about this before just going with a retrofit package. There is a good chance they can grind the lobes for the cam you are looking for on a late model core.
#5
Supreme Member
iTrader: (1)
Join Date: Jul 2004
Location: Calgary, AB, Canada
Posts: 10,763
Likes: 0
Received 4 Likes
on
4 Posts
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
And also consider very carefully if you really want a thumper series cam at all.
#6
Senior Member
Join Date: Dec 2004
Location: my garage
Posts: 556
Likes: 0
Received 0 Likes
on
0 Posts
Car: 84 firebird T/A
Engine: shinny 350
Transmission: slush box L65
Axle/Gears: round ones "3.73"
Yes, yes and yes!
I agree with all comments made.
I have put a retro comp cam in my roller ready 4 bolt main truck motor I used as the foundation for my build.
jeff
I agree with all comments made.
I have put a retro comp cam in my roller ready 4 bolt main truck motor I used as the foundation for my build.
jeff
#7
Junior Member
Thread Starter
Join Date: Mar 2007
Location: South Fl
Posts: 40
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Iroc-z
Engine: 396 Stroker 625hp
Transmission: 700r4 3000 stall
Why, what is wrong with the thumpr series camshafts, Ive only heard good things about them.
Trending Topics
#8
Supreme Member
iTrader: (1)
Join Date: Sep 2005
Posts: 26,123
Received 1,688 Likes
on
1,283 Posts
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
They are made for people who only care what their engine "sounds" like, and don't care what it runs like. Some of us have a word for people like that... starts with "L".
If al you're building is a "show" motor, then they're fine. That's what they're for. If you're building a motor that's supposed to RUN, you need something else. Even if you think somebody's motor "ran good" with one of those in it, you'd think otherwise if you saw how it ran with a cam optimized for RUNNING in it.
If al you're building is a "show" motor, then they're fine. That's what they're for. If you're building a motor that's supposed to RUN, you need something else. Even if you think somebody's motor "ran good" with one of those in it, you'd think otherwise if you saw how it ran with a cam optimized for RUNNING in it.
#9
Junior Member
Thread Starter
Join Date: Mar 2007
Location: South Fl
Posts: 40
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Iroc-z
Engine: 396 Stroker 625hp
Transmission: 700r4 3000 stall
So these cams run like s**t, because the cam I have in it now makes the motor run like a raped ape, I just thought I could get a little more out of it with the more duration and 107 LSA and pick up some good sound, dont get me wrong, with the cam I have now it lopes pretty good, I was just looking for a little more umph. Thanks for letting me know this before I spent an unneccasry $300.
#10
Supreme Member
iTrader: (1)
Join Date: Sep 2005
Posts: 26,123
Received 1,688 Likes
on
1,283 Posts
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
It's ground on a super narrow centerline to give it more of that "big cam" sound.
If you have a non-computer-controlled motor, and you don't mind the loss of high-end horsepower and idle vacuum and low-speed torque in exchange for a MUCH taller mid-range torque peak, it coud be OK. The combination of specs that those cams have, make their power curve real narrow and "peaky", and heavily non-computer-compatible. In other words, if you can somehow force your engine to always run between 3800 and 4400 RPM (or whatever the particualr cam produces), it could be OK; but it will run TERRIBLE outside of that range. It doesn't have the design features that make a cam run well across a wide RPM range and a variety of conditions.
I don't know what cam you have now; but odds are, it'll work better for whatever it's in, than that other kind.
If you have a non-computer-controlled motor, and you don't mind the loss of high-end horsepower and idle vacuum and low-speed torque in exchange for a MUCH taller mid-range torque peak, it coud be OK. The combination of specs that those cams have, make their power curve real narrow and "peaky", and heavily non-computer-compatible. In other words, if you can somehow force your engine to always run between 3800 and 4400 RPM (or whatever the particualr cam produces), it could be OK; but it will run TERRIBLE outside of that range. It doesn't have the design features that make a cam run well across a wide RPM range and a variety of conditions.
I don't know what cam you have now; but odds are, it'll work better for whatever it's in, than that other kind.
#11
Junior Member
Thread Starter
Join Date: Mar 2007
Location: South Fl
Posts: 40
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Iroc-z
Engine: 396 Stroker 625hp
Transmission: 700r4 3000 stall
The cam I have now is good for 2500 to 7000 and it works very good for my application, and no my motor is not computer controlled, and that cam only works in that RPM range well, why would anybody want a cam like that.
#13
Supreme Member
Join Date: Oct 2006
Posts: 1,974
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91 RS
Engine: 350 vortec
Transmission: T-5
Axle/Gears: not the best not the worst
well most people wouldnt... they just think they do... but sofa was just giving an example RPM range in the middle and very narrow is what he is saying... as in just to start a engine infront of a crowd and hear the oowwss and ahhhs
----------
nobody runs a marine engine that slow well except for the deisel guys or the cheapo people thinking they are saving gas but torque in a marine application is relativly useless as you only need to spin maybe a 18-19 inch prop so being able to spin that to 5500 off the line when the hull isnt going 5 knts just slows you down... not that marine racing is drag racing but you get the point
----------
nobody runs a marine engine that slow well except for the deisel guys or the cheapo people thinking they are saving gas but torque in a marine application is relativly useless as you only need to spin maybe a 18-19 inch prop so being able to spin that to 5500 off the line when the hull isnt going 5 knts just slows you down... not that marine racing is drag racing but you get the point
Last edited by SpitotRs305; 03-18-2007 at 09:25 AM.
#14
Junior Member
Thread Starter
Join Date: Mar 2007
Location: South Fl
Posts: 40
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Iroc-z
Engine: 396 Stroker 625hp
Transmission: 700r4 3000 stall
I know what you mean by the ooo's and awww's at the car shows, but at the track when I blow them away, we'll see who gets the ooo's and awww's then
#15
Supreme Member
iTrader: (1)
Join Date: Jul 2004
Location: Calgary, AB, Canada
Posts: 10,763
Likes: 0
Received 4 Likes
on
4 Posts
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
They are made for people who only care what their engine "sounds" like, and don't care what it runs like. Some of us have a word for people like that... starts with "L".
Thread
Thread Starter
Forum
Replies
Last Post
junkcltr
Tech / General Engine
6
08-02-2019 11:12 PM
ambainb
Camaros for Sale
11
04-25-2016 09:21 PM
gixxer92
Engine/Drivetrain/Suspension Parts for Sale
5
09-01-2015 04:32 PM