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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   How to make 550-600 Hp in a´540 (https://www.offshoreonly.com/forums/general-q/190480-how-make-550-600-hp-%B4540.html)

articfriends 07-13-2008 07:25 AM
I know this to be fact thru my own testing,if you flow a set of afr 315's and get 370 cfm intake then bolt on a dual plane the flow drops to around 280-300 cfm killing off most top end,Smitty

fbh-velocity 07-24-2008 04:58 PM
A lot of very good info here. At what RPM will i Peak TQ and HP with this combination?

-540 merlin
-9.6 CR 990 Heads mild portet 2.19 1.88 3 angle
-Roller 741 cam, crane roller rockers
-Merlin single plane intake
-800 Holley 9022 4150
-Lightning headers
-thunderbolt IV HP module 20* advance

At what WOT RPM should I prop this engine

fbh-velocity 07-26-2008 05:39 AM
Please??:party-smiley-004:

KAAMA 07-26-2008 07:21 AM
Originally Posted by fbh-velocity (Post 2634070)
A lot of very good info here. At what RPM will i Peak TQ and HP with this combination?
About 5700-5800rpm is what I have seen a 741 cam do in a naturally aspirated 540cid engine on the dyno with a single plane intake and fully ported Dart Pro-1 heads by JimV.

PatriYacht 07-26-2008 05:52 PM
It won't rev like that with the GM heads. More like 5400.

mikes280 07-26-2008 06:59 PM
Originally Posted by PSlonaker (Post 2617333)
The 741 cam is an excellent cam, but it doesnt make its best until approximately 6500 rpm. .
i don't think so i have used this cam on many motors and have never turned them 6500 :eek: and on a 540 it is done at about 5500

mikes280 07-26-2008 07:08 PM
Originally Posted by fbh-velocity (Post 2634070)
A lot of very good info here. At what RPM will i Peak TQ and HP with this combination?

-540 merlin
-9.6 CR 990 Heads mild portet 2.19 1.88 3 angle
-Roller 741 cam, crane roller rockers
-Merlin single plane intake
-800 Holley 9022 4150
-Lightning headers
-thunderbolt IV HP module 20* advance

At what WOT RPM should I prop this engine
you need more cfm, i did a pair of 540's with the 741 cam and we made the first pulls with a 800 cfm carb. Then used a adapter to put a 1050 on the motor and picked up 37 hp and 44 ft lbs of tq at the same rpm. Also with the 800 the motor was done a 5300 it went to 5800 with the 1050

mikes280 07-26-2008 07:10 PM
Originally Posted by PatriYacht (Post 2620740)
The Dart single plane is a good choice. Plus many are around used. Brodix or Victor may be too big. In the original post fbh said he wanted to use his 990 GM heads. For the power levels he's looking at, aftermarket heads are a huge waste of money. Use a fairly large cam with a long duration exhaust lobe to crutch the poor flowing stock exhaust port and you're all set. That;s what the 741 was designed for. I think the 731 wil struggle to make 550 hp in this instance. It's a good 454 cam but it's pretty mild even in a 502.
dead on

fbh-velocity 07-29-2008 04:08 PM
I need the grind # and or the cam#. I can´t find the "740" cam. ?

pslonaker 07-29-2008 04:57 PM
Originally Posted by fbh-velocity (Post 2638557)
I need the grind # and or the cam#. I can´t find the "740" cam. ?
I think you mean 741...

...Crane #168741

www.cranecams.com


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