Re: 1.5 or 1.6 Rockers for Big Block?
[Re: AndyF]
#171578
12/20/08 03:55 PM
12/20/08 03:55 PM
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Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
MoparDonny
OP
top fuel
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OP
top fuel
Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
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Quote:
I dug deep and went with 1.85 ratio on the intakes and 1.70 ratio on the exhausts. Seems to really work great. Last time on the dyno this 505 motor was up around 800 hp with just the Indy EZ heads.
Andy, those sure look nice but if they are Jesel rockers I'd say they are twice my budget then some!!  My "CAR" budget is almost non-existant these days but I'd like to get quality rockers when I do get them. Have to lose the stockers pretty quick. I use them with the 509 cam right now but I might get a .560 lift Comp or a .590 MP cam in the not too distant future.
Don
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Re: 1.5 or 1.6 Rockers for Big Block?
[Re: MoparDonny]
#171584
12/21/08 12:30 PM
12/21/08 12:30 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Mr. P, It's a 451 build that I have an XE284H for with i believe 241/247 @ .050 dur and .510 lift but I also might aquire an XE295HL which I think is 251/257 @ .050 dur and .564 lift. I was just kind of thinking that more lift from a 1.6 couldn't hurt in any situation but wanted some feedback about that as I've not played around with anything other than Stock rockers and a MP-280/474 or a MP-292/509.
Do you think the valvetrain would be OK with an XE295HL, 1.6 Rockers and a decent spring?
Don.
You see that between the 2 cams your looking at, there
is 10* difference and the question comes, do you like
the currant duration but want more lift, duration
moves the revs higher. So that question would need
to be anwsered first, then the next would be, do
your heads work(flow) at the higher lift or is it
just a waste of lift. But if you think your happy
with the currant duration and can use the lift then
I would use the 1.6 but then you will most likely
need springs to go along with the lift and maybe
some clearance work in the pushrod area(unsure)
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Re: 1.5 or 1.6 Rockers for Big Block?
[Re: MR_P_BODY]
#171586
12/21/08 09:42 PM
12/21/08 09:42 PM
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Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
MoparDonny
OP
top fuel
|
OP
top fuel
Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
|
Quote:
You see that between the 2 cams your looking at, there
is 10* difference and the question comes, do you like
the currant duration but want more lift, duration
moves the revs higher. So that question would need
to be anwsered first, then the next would be, do
your heads work(flow) at the higher lift or is it
just a waste of lift. But if you think your happy
with the currant duration and can use the lift then
I would use the 1.6 but then you will most likely
need springs to go along with the lift and maybe
some clearance work in the pushrod area(unsure)
I completely understand what you are saying which is why I am a little on the iffy side about using the 295HL. My Dad has it in his 496 and it is one nasty little stick. I think the XE284H is probably better for my realistic driving requirements. If I had 1.5 rockers and wanted morte lift I could just get an XE285HL which I think would be very similar in idle to the 284.
Thanks for all the thoughts guys! 
Don.
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