434 Camshaft clearance
#1
Junior Member
JOURNEYMAN
Thread Starter
Join Date: Aug 2006
Posts: 28
434 Camshaft clearance
I thought I had read somewhere that in a stock block you are limited to how much camshaft you can throw at it without hitting the rods even on a small base circle, does anyone know if this is true? What is the limit? Thanks, any info greatly appreciated!
#2
Senior Member
RACING JUNKIE
Join Date: Jan 2006
Location: La.
Posts: 2,890
It kinda depends on the rods you use and what some cam manufacturers call a small base circle. Some cam grinders call a .930 a small base circle and some call a .900 a small base circle. In most cases you're safe with a .630 to .640 lift. I had bullit grind my cam and it's a .870 base circle, i'm running a .689 lift with a set of Lunati Promod rods, but it's also in a Dart lil "M" block, a stock block has the came cam height.
Zip.
Zip.
#4
Senior Member
SENIOR BUILDER
Join Date: Nov 2008
Location: Phoenix AZ
Posts: 116
Duration and separation angle will come into play as well. I've always been fine with .450 lobe lift, but it got a little tight after 278 duration. at 284 / 292 I had to pull .040 from the rods to get what I felt was safe clearance.
Mock it up before the balance work..
Mock it up before the balance work..
#5
Senior Member
RACING JUNKIE
Join Date: Jan 2006
Location: La.
Posts: 2,890
Originally Posted by ccperf721p
Duration and separation angle will come into play as well. I've always been fine with .450 lobe lift, but it got a little tight after 278 duration. at 284 / 292 I had to pull .040 from the rods to get what I felt was safe clearance.
Mock it up before the balance work..
Mock it up before the balance work..
Mine is right in the danger zone, that why i ask them to grind it too an .880 BC which is not standard, but i'd seen the problem before.
Zip.