Ghostrider

Okay, I know. I really need to call RM Builder but bare with me...

I've been reading into the Crane Cam scenario a bit too much I think. I have a custom cam now but I still can't go past the Crane 741 (which I don't have). However; people here talk about reversion being an issue of concern because of LSA of 112 on the 741. The 525efi cam was the crane 731 with 114 LSA to help combat reversion so on that idea, how's the Crane '771' cam stack up as a potential candidate?

It has 114 deg LSA, 0.621 int./0.632 exh. lift and is good for a 3'800 to 7'000rpm range (I know that's huge!)

But in comparison the the 741 cam at 112 deg LSA, 0.610 int./0.632 exh. lift and 3'000-6'500rpm wouldn't the 114 LSA of the 771 be better?

I really need a new hobby...

Griff

The 525EFI cam is a 741 ground a 114 lob sep. The 114 is more for the efi system than to prevent reversion. With decent exhaust, the regular 741 on a 112 should not have reversion problems.
I had a 731 in my 454 and its has 112 lob sep and never had a hint of reversion with CMI unitops.

Its pretty much a moot point though since it is highly unlikey that you be able to find any of them.

I don't know what the 771 is. What are all the specs???

jeffswav

I did the same thing you are doing. Then I called Bob, I told him what I was looking for and he designed the cam for my engine. The time he spends with you is well worth the few extra dollars.

Ghostrider

Thanks Jeff. I think I'll suffer the international call charge and give him a ring. What time zone is he in?

Specs on the 771 are:
Brand: Crane Cams
Product Line: Crane PowerMax Camshafts
Part Type: Camshafts
Part Number: CRN-168771
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 3,800-7,000
Intake Duration at 050 inch Lift: 240
Exhaust Duration at 050 inch Lift: 248
Duration at 050 inch Lift: 240 int./248 exh.
Advertised Intake Duration: 302
Advertised Exhaust Duration: 310
Advertised Duration: 302 int./310 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.621 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.632 in.
Valve Lift with Factory Rocker Arm Ratio: 0.621 int./0.632 exh. lift
Lobe Separation (degrees): 114
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.
Computer-Controlled Compatible: No
Grind Number: HR-240/365-2S-14 IG

And Summit has a few left, that's why I asked.

Cheers,
John

kennyo

Why not email him through here?

jeffswav

Here is Bobs email. He is in New York, Eastern time zone. [email protected]

Ghostrider

Brilliant, thanks!