Hydraulic or Roller?
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Think in many cases the whole fast ramp thing is a waste.
If its race only or very mild possibly worthwhile but for something thats going to be hammered on the street/high rpm it just beats things up, personally Im done with them.
Is it really worth the claimed 5-10hp , guessing not.
At least going by what my parts replacemement costs are for these things taking a dump/premature wear.
If its race only or very mild possibly worthwhile but for something thats going to be hammered on the street/high rpm it just beats things up, personally Im done with them.
Is it really worth the claimed 5-10hp , guessing not.
At least going by what my parts replacemement costs are for these things taking a dump/premature wear.
If it is only 5-10 HP it is not worth it. The fast ramp flat tappet cams are many times worth 50 or more RWHP ovrt a stock cam, more with good heads. That is a huge jump. Here is a guy that got 60 RWHP out of a flat tappet cam upgrade.http://forums.corvetteforum.com/c3-t...mp-xe268h.html
Drifting
Joined: Dec 2005
Posts: 1,360
Likes: 3
From: NORTHEAST
I respect Blockman's opinions and contributions. He is one of the valuable contributors on the forum. Race and street are two different build parameters, uses and have very different maintanance expectations. Circle track engines are thoroghly inspected and freshened on a regular basis. Blown pro stock engines are many times torn down, inspected and rebuilt as needed every week during the season, many times between runs. The OP is asking for advice for his needs. I still think the best option for a durable, low mantainence moderate performance street build is a hydraulic roller hands down. If you want a little more RPM, better valvetrain stability and not break the budget a beehive spring upgrade when intalling the cam would be my advice since you need to buy new springs and setup the springs anyway. Too many guys try for maximum power on the cheap with a fast ramp flat tappet and end up having to replace a cam with a wiped lobe soon after. Hydraulic lifter valvetrains can be setup to run 7500 RPM but are cost prohibitive for many. Just my 2 cents.
That being said to get 650 lift out of a falt tappet cam you will need a 1.8 or 1.9 ratio rocker!! And putting that much rocker on on a flat tappet cam it will not last long thats for sure.
