Thread: mark IV 454 1983

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it's a dully with a thm400 and i'd plan on a gear vendors overdrive. I read a guy who said they make good door stops, but I also heard IF you can find 049's or 781's and rebuild them you'd just about have a set of aluminum for almost the same amount of money (what size carb are you running)

Originally Posted by craig akiyama

...I read a guy who said they make good door stops...(what size carb are you running)

Yes, a lot of people will tell you that.


I am running a holley 770SA vacuum secondary.

Originally Posted by 65cayne

Yes, a lot of people will tell you that.

and alot of people do not know nothing like i told you them heads make 330 hp on a boat in stock form for low rpm or a small cid big block i would use them in a low buck build sounds like with a over drive you not going to see hi rpm so how big of a head do you need if you never going past 4500

Originally Posted by pat mccarthy

...a small cid big block ...

So for you Pat, thats like ...what... 570+ cubic inches ? You play with big boys toys...

I still play with the kiddie stuff (454 and less)