bottom end build
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New User
Joined: Feb 2004
Posts: 8
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From: alabama
bottom end build
hey guys, need some advice on parts and such, i want this to be a bottom end engine, i will probibly never see above 6000 RPM, but will probibly take it too 6000 or so seeing how i like to wind them out sometimes this is going in a 3/4 ton, that is 4x4. it will be used for work purposes and pulling trailers both big and small and off-roading,
i know that having top end or bottom end is a win/lose situation and you have to sacrifice one for the other, but can i have both HP and torque on the bottom end of the spectrum.
spacifically what i want to know is what items do i really need to stay away from. i've heard roller rockers dont do any good till on up in the RPM's. and i'm not going to have the heads hoged out, i'm just gonna match them myself. and probibly keep the same size valves. so along these same lines what can yall tell me to not even consider buying, and what items i might want to start collecting for my build
i am using a mirror "105" block, and 390 crank and rods.
i would also like to know if anybody has a link to where i can read a lot of information about cams. and what all the numbers that are associated with them mean (lift. dur. seperation) and what parts are needed for the different cam setups.
thanks
i know that having top end or bottom end is a win/lose situation and you have to sacrifice one for the other, but can i have both HP and torque on the bottom end of the spectrum.
spacifically what i want to know is what items do i really need to stay away from. i've heard roller rockers dont do any good till on up in the RPM's. and i'm not going to have the heads hoged out, i'm just gonna match them myself. and probibly keep the same size valves. so along these same lines what can yall tell me to not even consider buying, and what items i might want to start collecting for my build
i am using a mirror "105" block, and 390 crank and rods.
i would also like to know if anybody has a link to where i can read a lot of information about cams. and what all the numbers that are associated with them mean (lift. dur. seperation) and what parts are needed for the different cam setups.
thanks
Posting Guru
Joined: Aug 2001
Posts: 2,117
Likes: 0
From: Evanston, WY
The engine you describe as a "bottom end" engine is one I would call "middle of the road", the difference, to me, is the 6000rpm romps.
Assuming pump gas and sea level. Don't bother with roller rockers, roller cam, carb over 750, single plane manifolds, large tube headers, gear drive timing sets, nitrous, forced induction, magnetos, titanium valvetrain, or fuzzy dice.
Do consider 9.5:1, Performer RPM manifold, Vacuum secondary 750 holley, headers, flat hydraulic lifters, Performer RPM cam or maybe just a little smaller but not much, customized timing curve, and dual exhaust.
Some of the cam manufacturers have FAQs on their websites that will help with the cam tutorial. Also do some Google searches on things like: "cam timing" "centerline angle" "camshaft basics". You will definately find sites that go into some detail. Very fun stuff to study, and it will help you decipher cam speak to your benefit.
-Scouder
Assuming pump gas and sea level. Don't bother with roller rockers, roller cam, carb over 750, single plane manifolds, large tube headers, gear drive timing sets, nitrous, forced induction, magnetos, titanium valvetrain, or fuzzy dice.
Do consider 9.5:1, Performer RPM manifold, Vacuum secondary 750 holley, headers, flat hydraulic lifters, Performer RPM cam or maybe just a little smaller but not much, customized timing curve, and dual exhaust.
Some of the cam manufacturers have FAQs on their websites that will help with the cam tutorial. Also do some Google searches on things like: "cam timing" "centerline angle" "camshaft basics". You will definately find sites that go into some detail. Very fun stuff to study, and it will help you decipher cam speak to your benefit.
-Scouder
Posting Guru
Joined: Jul 2003
Posts: 2,232
Likes: 1
From: Colville, Washington
Forged pistons, MSD or similar ignition, ARP rod bolts and maybe main studs, a second on the customized timing curve-very important to run hard. The perf RPM cam might be a little large for lo-end torque. Oh-balance the engine, it'll live longer. I had a similar engine before my present 428; 9.4:1, early Ford 4bbl intake, 650 Holley dble pump, MSD 6A, Pertronix in well set up Ford dizzy, cheap headers, and home ported C1AE-A heads. It ran really well from 1500-6400 rpm. Almost forgot Cam Dynamics 284 Energizer cam, adjustable rockers.
