Tim Schuetz;s (NAPA68) not so stock 1967 Nova!

[novadude]

Not sure I understand the &quot;lot of head to tame down&quot; comment. It's 422 ci. How does that runner CSA compare to a L72 427 rectangular port head? I'll bet it's still a much smaller port to feed the same size engine. If you cam it right, I don't see why you couldn't have a civil engine with those large ports. If it was a 327, that might be a different story. [img]<<GRAEMLIN_URL>>/smile.gif[/img]

[napa68]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: novadude</div><div class="ubbcode-body">Not sure I understand the &quot;lot of head to tame down&quot; comment. It's 422 ci. How does that runner CSA compare to a L72 427 rectangular port head? I'll bet it's still a much smaller port to feed the same size engine. If you cam it right, I don't see why you couldn't have a civil engine with those large ports. If it was a 327, that might be a different story. [img]<<GRAEMLIN_URL>>/smile.gif[/img] </div></div>

If the question you are asking is the CC's of the intake port, they are 227's. I believe the L72 840 heads to be in the high 200's if not higher. Certainly, there is more to the puzzle from SBC to BBC (i.e. valve angles)

The size of the engine should help quite a bit as well as the weight of the car.

[novadude]

You cannot compare runner cc's from different engine families, as port lengths are different. The engine response to CSA (cross sectional area) changes. It doesn't really care about cc's. cc's are just a convenient way to compare CSA changes, since the cylinder head intake port length is relatively fixed for a given engine family.

My point was that the cross sectional area of the BBC L72 head is HUGE compared to even a large aftermarket SBC head. No reason why a 422 SBC with a 227 cc head can't be as &quot;civil&quot; as a L72 427 BBC with even larger ports. [img]<<GRAEMLIN_URL>>/wink.gif[/img]