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Old 03-14-2005, 01:28 PM
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raised exhaust ports

Do you have to buy new headers to fit the raised ports on aftermarket bbc heads? I'm looking at stepping up from a performer to a performer rpm and a new set of heads for my Corvette. I've got 92cc iron heads 2.19/1.88; 427 .030 over block; factory forged rods; TRW L-2300F forged pistons; roller rockers; xe268/280 .515/.520 224/230@.50 110; built th400 w/ shift kit; 3.55 rear; hooker supercmp headers; demon 750 dp; pertronics HEI dist.; This is not a race car- it's just a cruiser, and parade car, but I like to burn rubber from time to time. If raised ports mean I have to change headers-forget it. Would Performer RPM 110cc oval parts be a good choice or is there something better? Feel free to comment and make suggestions on my combo. Thanks

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Old 03-14-2005, 02:38 PM
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Raised port No

Raised and relocated Yes,

Spread ported Yes,

Make sure the steering linkage will clear. Seems it's the most common to cause problems. I don't think .100 will affect clearance though.

Last edited by johnsongrass1; 03-14-2005 at 02:40 PM. Reason: stupid fingers won't move right
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Old 03-14-2005, 06:18 PM
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merlin oval ports

I'm looking at the Merlin 269cc oval ports or the Edelbrock rpm heads. I know the rpms will hook right up to my headers, but I'm not sure about the Merlins. Something about a 1 inch raised port boss? Me no understand. If it means I have to pull the headers up 1 in- not good. I just don't want to make a mistake and find out when I'm trying to put it together. Which of these two heads with give me the most bang for my buck? Would the extra $ for aluminum be worth it? Also It's between the Edelbrock rpm and the merlin dual plane intakes. The Merlin intake claims 0-6000 rpm, but I can't find any real world experiences with it. Which manifold would be the best? Sorry for all these remedial type questions, but as you can see I'm basically a beginner. Thanks
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Old 03-15-2005, 10:31 PM
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bbc heads

Let's see if I can get down to the meat of the matter: for my setup, what would be the best bbc heads for low end seat of the pants grunt and good mid/upper range?
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