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Shave your heads .040/.050, 4500 vert, and add your electric water pump and your there. Might not even need the vert. But that would guarantee it.

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Agree 100%

And the last thing I would do is put larger diameter headers on it. The ones installed are plenty adequate to support a much stouter motor than what you have.

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Yes, dont go bigger on the headers. Look at Rons old combo above. Good Combo!

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The heads were ported with the M.P. Template kit FWIW. I also tried a Holley 850 in place of my 750 Silver Claw and the car slowed down if you can believe that. I still don't quite understand that. With the Tunnel Ram, I run two 660 CFM Holley's and it loves it. I was just trying to keep the motor under the hood for now though.

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First, Thanks to everyone for the input. Much appreciated.

After reading through this thread and doing some research, I do believe there should be something to be gained by swapping to an 850. When I tried the last 850, the car sounded substantially louder. I would have sworn it would have picked up E.T. At the track it seemed to run rich even after re-jetting and general tuning. I know the carb is a good working carb. It was on my Dads Belvedere for years and worked great. It just didn't seem to work out well on my car. I will throw another one on there and see what happens.

Regarding compression, I know it's holding me back a good amount. I just hate to throw a bunch of money at it right now. By the time I buy the pistons, bore the motor, get rid of my stupid "six pack rods", balance it, buy gaskets and rings it'll be a good chunk of change. I have a 13:1 451 short block and a 10.5:1 440 long block sitting in the garage for other projects. I just assume throw one of those in there for a bit before I throw a ton of money at this motor right now.

Purchasing cylinder heads is also probably out of the question for awhile. Cutting mine down does seem tempting though as does advancing the cam. I've contemplated advancing the cam, even considered swapping rocker arms to 1.6's. Again, these are substantially cheaper projects and involve modifying or changing parts I already have so perhaps that adds appeal.

Thanks again for the input guys! I really appreciate it! If money was no object I would certainly try everything. However coming up on the holidays in this awesome economy my hands are slightly tied for now. At the same time I think part of the fun for me is the quest to see how fast I can go with this budget build. I just worry that I'm approaching the end of the budget aspect and may be expecting to much from the setup. I'll be sure to keep you all posted with what directions I go and how it works out.

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What is the cam currently installed on for ICL? I would definitely advance the cam...Its a few hours of your time, some gaskets, and a degree wheel and could really make a difference! My car was a dog all last year until I finally advanced my cam 4 degrees, and it really woke up, especially on the 60' foot...Heavy car just like yours too...try it, might like it

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Thats very close to my old 440 I used to have in my 63. Its a good build to compare too:

1970 440 block .030 with stock rods and KB quench dome pitons and stock crank

906 heads I ported and added 2.14 and 1.81 valves and they were cut to give me 10.0 and quench with the KB pistons.

Holley Street Dominator intake with an 850 DP

Mallory dist with MP orange ign box running 37 total

MP .557 cam and Isky ductile rockers

Hedman 1-3/4 headers with 3 inch pipes and a H-pipe with Ultra-Flow mufflers

727 with Dynamic 9.5 converter that flashes about 4200 and turbo action revers manual valve body

8-3/4 with 4.30's and 30 x 9 Hoosier radial slicks

Car weighs just over 3700 lbs with me in it and ran a best ever of 11.49 @ 116 on a real good day. Average et's were from 11.60's to 11.80's. Ron

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I meant to say that I only posted my old combo just to give you and idea of how another combo close to yours ran so it might help you compare things with yours. But I did forget to tell you I had the MP .557 cam in on a 104 installed centerline. Hope it might help you some and good luck with it. Ron

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I meant to say that I only posted my old combo just to give you and idea of how another combo close to yours ran so it might help you compare things with yours. But I did forget to tell you I had the MP .557 cam in on a 104 installed centerline. Hope it might help you some and good luck with it. Ron

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Thanks for the info Ron. I'm debating on advancing the cam only because I need more top end power than bottom end right now. My understanding is advancing the cam will do just the opposite. Thoughts?

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Why are you shifting at only 56-5800? A 250ish @ .050 cam in a 440 should be shifted about 1000 rpm higher. Also, you mentioned swapping to a 1.6 rocker (assuming roller), but what are you running now?

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Anything over 5800 and the car slows down across the board. As I type that, I think back to Cab's comment about fuel or other scenarios that I may be overlooking.

Rocker arms are 1.5 rollers.

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That's what I suspected. I think you have valvetrain instability that is limiting your rpm. I also think the cam is too big for that compression ratio. You need cylinder pressure and the only way to get it is with more compression or a smaller cam. Advancing the cam will help too, but it will take away from the top end. A cam about 15-20 degrees smaller and correct the valvetrain issues, and it will be a totally different animal.

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I'll bite, how did you determine that already? What's your recommendation for repair? How much is it going to cost me? Is it guaranteed to make my car faster?

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That's what I suspected. I think you have valvetrain instability that is limiting your rpm. I also think the cam is too big for that compression ratio. You need cylinder pressure and the only way to get it is with more compression or a smaller cam. Advancing the cam will help too, but it will take away from the top end. A cam about 15-20 degrees smaller and correct the valvetrain issues, and it will be a totally different animal.

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I'll bite, how did you determine that already? What's your recommendation for repair? How much is it going to cost me? Is it guaranteed to make my car faster?

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I'm not asking you to bite anything. It's obvious the car needs more low end and more rpm. Do you already have a smaller cam? If not, that will cost you money. Correcting the valvetrain will depend on how it's done. What other rockers do you have?
Out of all the advice given, you want a guarantee from me. Sounds like you think I know something. How's this, I guarantee it's wrong and I guarantee my solution will make it right. The rest is up to you.

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These were Dwayne Porters personal Heads, hand ported, to MW port size. Ran only on a dyno about 10 pulls, made 712 HP on a 451 motor.
I have oil lines, valley cover (indy), head bolts
See pic. I have more to send if needed. All you see is included.
Message here please.
$2850. Reasonable offers considered.
Message here please.
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Edited by Blown70 (Fri Aug 22 2014 09:52 AM)

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