Have I chosen a suitable cam or made a mistake?
11-23-2007, 07:43 PM
#1
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Have I chosen a suitable cam or made a mistake?
I've been wrestling with myself over this cam choice ever since I installed it.
Here's the engine specs
69 427 L36
9.5 to 1 Silvolite cast pistons .028 down from deck
Cast iron stock oval port heads 104cc
Stock alum manifold
Q-Jet, Stock dist with points
2" Allen's stainless exhaust
M-20 trans with 3.08's
Cam specs for Lunati 302A4LUN hyd flat tappet
112 LSA
.515 lift at valve with CC roller tipped 1.7 rockers
.217 in / .217 ex @ .050
I was looking for low end torque as I rarely shift over 4000 rpms. I keep thinking I could have chosen better, your opinions?
Here's the engine specs
69 427 L36
9.5 to 1 Silvolite cast pistons .028 down from deck
Cast iron stock oval port heads 104cc
Stock alum manifold
Q-Jet, Stock dist with points
2" Allen's stainless exhaust
M-20 trans with 3.08's
Cam specs for Lunati 302A4LUN hyd flat tappet
112 LSA
.515 lift at valve with CC roller tipped 1.7 rockers
.217 in / .217 ex @ .050
I was looking for low end torque as I rarely shift over 4000 rpms. I keep thinking I could have chosen better, your opinions?
Last edited by 69monzaredbigblock; 11-23-2007 at 07:46 PM.
11-23-2007, 09:03 PM
#2
Surely with a big block the 2" exhaust is a typo,. I think with the smaller
exhaust valves of the oval port heads you should have went with a
dual pattern cam, and even though you shift at 4000 the majority of the time I would still kick up the duration on the intake some for
more midrange, 427 big block will always have good low end torque.
exhaust valves of the oval port heads you should have went with a
dual pattern cam, and even though you shift at 4000 the majority of the time I would still kick up the duration on the intake some for
more midrange, 427 big block will always have good low end torque.
11-23-2007, 09:36 PM
#3
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Well, you'll definitely have low end TQ....but I agree...that's not usually a problem with a 427. Even for a mild motor...I'd have added about 15-20* of duration and about .100 lift.
JIM
JIM
11-24-2007, 12:13 PM
#5
Team Owner
Surely with a big block the 2" exhaust is a typo,. I think with the smaller
exhaust valves of the oval port heads you should have went with a
dual pattern cam, and even though you shift at 4000 the majority of the time I would still kick up the duration on the intake some for
more midrange, 427 big block will always have good low end torque.
exhaust valves of the oval port heads you should have went with a
dual pattern cam, and even though you shift at 4000 the majority of the time I would still kick up the duration on the intake some for
more midrange, 427 big block will always have good low end torque.
LM - he is talking about 2 inch primary piped headers. Which is mild for a BBC.
High 220's to low 230's makes a very mild cam for a BBC. My original 427 had a 242/248 solid roller and I was able to lug it around in 4th gear
