Re: More HP for HP 500
 

Yes, the exhaust is raised .600" like most others.

Chris

Re: More HP for HP 500
 

The only aluminum heads I have heard that are not is the Eldebrock.I don't think they have very good port velocity.

What about the pro 1"s??

Re: More HP for HP 500
 

Strip Poker 388
AFR told me the exhaust is raised .375".

Re: More HP for HP 500
 

Does the 741 cam help the performance of a stock HP 500 (carb) ?

Re: More HP for HP 500
 

no disrespect to anyone but no way now how is a 500hp carb motor with a cam and 315cc cnc ported heads going to make 600hp at 5400-5500rpms. sorry it is just not going to happen on pump gas. save your cash cmi's are not going to do anything beter than your gill's. in a perfect world with afr heads, bumped up timing a little, bumped up comp. a little and good cam you might gain 100hp. a stock 500hp is like 465hp.

Re: More HP for HP 500
 

While we are on the subject, on a carb HP 500 what rpm's do you prop for to obtain max top end speed?

Re: More HP for HP 500
 

4800-5200 - labbed 26 4 blade on a 288 sunsation ,

Re: More HP for HP 500
 

So on a side by side installation the stock cmi headers should not touch.

I wonder if there is enough slack in the hose to accept the .375 higher exhaust port to line up with the tail pipes???


What do yall think??????


Rob

Re: More HP for HP 500
 

Hey Jeff , Drew here, You can always do what I did Blow A Motor and step upi to 540,s... Runnong a strong 80 plus right now !!!

Re: More HP for HP 500
 

if you use the CMI with the flex flairs the tail pipe has some adjustability. If you buy a used set even if they are the cool collar design make sure the tail pipe connection is the flex flair design the one they make for Mercury are not.