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Discussion Starter · #1 ·
I've got a completely stock 454 out of a '78 Winnebago. I haven't tore it down yet to see the insides, but I do know that it has 781 heads. The motor only has 80k on it. I have no idea what the comp ratio is or if it's 4-bolt mains, steel or cast crank etc.

My question is this, with the current heads, can I make 6-700 hp on pump gas with this motor? If so, what parts do I need to get there. If not, what parts will I need to get there? I'm on a really tight budget, just paid for my sons college.

What do you all think?:smt102
 

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If you stroke it to a 496, you will get 500 HP easily. Add a set of AFR 305's you will get 600 HP then. Then you have to think about a solid roller cam. You are right its not cheap.

Dave
 

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I am not a engine builder but I dont think that "700 on pump gas and budget" go in the same sentence.You are difinitley going to need a good set of heads. You can work the ones you got but by the time you stick the money in them, you could buy a set of aftermarket.To withstand 700hp you are going to need a rotating assembly so there goes your "budget".
 

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do a 496, and you can get around 650hp with your heads on a budget.
 

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That engine will be 7.8 to 1. Yes, you can make 600 on pump gas with those heads. You may as well build a 496 and do a little work on the heads. I would suggest a hydraulic roller. I did a hydraulic roller 468 that made 618 on pump gas with 781 heads.
 

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Discussion Starter · #7 ·
That engine will be 7.8 to 1. Yes, you can make 600 on pump gas with those heads. You may as well build a 496 and do a little work on the heads. I would suggest a hydraulic roller. I did a hydraulic roller 468 that made 618 on pump gas with 781 heads.
What where the cam specs?
 

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my 502 is 10:1 comp, hyd.roller 252/263 dur. on a 110lsa, 049s w/ bowl work, 2.19"/1.88"
made 626hp @ 6200 & 627tq @ 4600.
500 cubes on pump gas will need cam around 250s to make over 600hp with stock heads
 
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