Hello
I am planning to work on my duster during winter and decided to swap my camshaft with solid roller. Its a fun car that des like 2000 miles a 1500 miles a year tops. Its street driven as there are no tracks in my country.
I was also thinking about mechanical flat tappet... Not sure what is better for me so here goes all the info:
Engine is 471" B stroker.
Heads are ported 452s that flow 270 at .500 lift and something like 272 at .550 and this is as high as my flowchart shows data.
They were done by the Koffels Place.
Currently I have Comp Cams 21-225-4 flat tappet camshaft.
Cam specs are:
.507/.510 lift
110 lsa
240/246 duration at .050
I use it with 1,6:1 rockers so effective lift is
.540/.544
My converter is PTC 9,5" 3200+ stall. Trans was rebuilt this year and converter is brand new.
Carb is 950 double pumper.
Rear end is 8,75" with 4.11 gears.
With my heads i probably should avoid high lift and focus on duration so I was looking for a cam that has up to .550 lift and that has more duration than my current one but no luck.
I also want to avoid high rpm, my limiter is set to 6400rpm and I usually shift at 6200.
I will use new cam with standard ratio 1.5:1 roller rockers.
Looking at comp cams offer there is 23-702-9 cam that is almost perfect:
.576/.582
110 lsa
248/254 duration at .050
The only thing I dont like is the lift. I dont want to risk it ad I can get clearance issue.
Other alternaive is 23-741-9 cam:
.550/.550
110 lsa
244/244 duration at .050
But could have more duration...
Can You guys suggest something that You think is better?
Does custom grind make sense? Or is it my only option? ;-)
How much more is custom grind?
Can I go to solid roller just like that or any engine work is needed?
Is solid roller worth the extra money over solid flat tappet?
Any guesses about power gains?
Looking for advice from people that went thru this. I am in Europe so its a bit harder for me to get legit info.
Thanks!
