454 to 498 Build - how does this sound - Page 2 - Chevelle Tech
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post #16 of 19 (permalink) Old May 10th, 19, 2:22 PM
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Jeff
 
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Re: 454 to 498 Build - how does this sound

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Originally Posted by DFuller43 View Post
I bought the block from a guy on CL. 4 bolt main. Had already been align honed recently and had ARP main bolts. Guy didn't share much other info. I do not have the heads yet, but the Brodix 270 oval port look like they would be a good fit and work well with the RPM air gap (which I do have). I'm also considering another Hydraulic Roller cam... 288/294, 236/242 @ .050, .521/.54 lift, 110 LSA. Does that sound like it would be a better fit?
looks a little better for a street car. what heads did your 396 have on it? you know stock heads are heavy but with the right work they can be made to work real good for what your doing. Larger valves, some bowl and port polishing and 500 plus is not a stretch at all. the thing is you need to decide what your really doing and what your true goals are, there a different opinions based on use of car and all that. A lot of people will build a high dollar engine that they can't even use and then find out they have to do a ton of work to the car to get the power to the ground and make it usable.

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post #17 of 19 (permalink) Old May 11th, 19, 5:44 PM
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Thor
 
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Re: 454 to 498 Build - how does this sound

I have 498 with RR 270s, but with a full point less compression. Your torque and hp estimates are low, mine made 621tq/624hp. I used a Chris Straub cam 242/254 on 107, my particular cam is for a heavy car, 3 speed auto and a tall gear so probably very different than what he would make for you with a stick and overdrive. I also specified that I wanted peak hp at a low 5700 rpm that in turn gave me a relatively narrow power band, but that is exactly what I requested.

If your cylinders are scratched 070 may not be enough, on mine the cylinders were still nice, it was a block I had taken to 060 and raced 2 seasons (20 years ago). If you have nice cylinders and just want to clean up have at it, but it may not clean up as well as your expecting.

Is your Header size a typo?
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post #18 of 19 (permalink) Old May 11th, 19, 5:58 PM
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Beth
 
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Re: 454 to 498 Build - how does this sound

Quote:
Originally Posted by DFuller43 View Post
I bought the block from a guy on CL. 4 bolt main. Had already been align honed recently and had ARP main bolts. Guy didn't share much other info. I do not have the heads yet, but the Brodix 270 oval port look like they would be a good fit and work well with the RPM air gap (which I do have). I'm also considering another Hydraulic Roller cam... 288/294, 236/242 @ .050, .521/.54 lift, 110 LSA. Does that sound like it would be a better fit?
Those heads and cam should work great together. I have edelbrock heads and wish I had Brodix :-)

For a street engine I want a 110 - 112 LSA. You can also save $200 by using long-slot stock rocker arms when you keep the lift around .550".

If you haven't got your rotating assy yet check with Mike Lewis. I would keep compression at 10-1 so you can run pump gas.

67 Chevelle convertible, 138 vin, original 4 speed, bucket seats, Marina Blue with black interior
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post #19 of 19 (permalink) Old May 11th, 19, 8:23 PM
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Eric
 
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Re: 454 to 498 Build - how does this sound

A buddy has a 498 with RR oval ports, Vic Jr intake & a Straub Hyd roller. 400 trans and 2500 convertor with 3.73's out back. He drives it all over on the street and to the track. It has run a best of 11.30's with very little tuning.
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