Quote:
Originally Posted by steve25
Several things are wrong with your combo!
1)
The larger port volume of those aftermarket heads or any of the available aftermarket heads only serves to harm throttle response and torque in your CID motor below 4000 rpm.
2)
You want more then 300 hp you say, well stock heads are more then capable of producing that along as a stated above. Producing superior throttle response.
You only need 175 cfm@28” to make over 350 hp.
Good port velocity in the motors average rpm range is just as important or more then cfm if the motor will not run above 5500 rpm.
3) your choice of intake manifold is harming the motors power production just like your choice of heads is.
4) if your cam is not producing at least 175 to 180 psi of cranking compression then that’s a issue also and a big issue at that!
In short and in my opinion everything you have bolted on above the deck of the block is fully counter productive to your stated goals.
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Interesting. I appreciate the numbers for me to check. I was wondering if I should change out the intake manifold from the RPM Performer to the standard Performer. I read that somewhere online and then another place said to go with the RPM
The heads were a little bit of an investment so I would like to see if I can get those to work. I thought about taking them off to port them but you're suggesting I should definitely not do that?
I kinda get the impression that the engine isn't really flowing well. I did recently stumble on the suggestion of checking the pushrod length and that if they are too short, the valves won't open to its full potential. I do not believe I checked that and hope to get to that today.