[urq] Re: [20v] 7A vs 3B C/R

[QSHIPQ at aol.com]

Reading thru this thread myself, I'll add 2 cents. I've had the cc's on both heads cked and found them to be identical (or close to it before "ccing" the head). ~35cc +/- IMS.

IMU that the 3B and the 7a heads are interchangeable with cams and ancillaries.  WRT block differences, the pistons are different between the 2 blocks, but I can't recall if that was (I suspect so) a wrist pin location change or actually divoted pistons in the 3B.

HTH

Scott Justusson
QSHIPQ Performance Tuning
In a message dated 5/7/2003 12:11:48 PM Eastern Standard Time, bbell at surview.com writes:

> Or, the 7a head could have been milled, unlikely, but.... Do you know the
> history of that head?
>
> Bruce
> -----Original Message-----
> From: urq-admin at audifans.com [mailto:urq-admin at audifans.com]On Behalf Of
> JShadzi at aol.com
> Sent: Wednesday, May 07, 2003 10:31 AM
> To: "Brandon Rogers"; """20V list"""; 200q20v at audifans.com
> Cc: urq at audifans.com
> Subject: Re: [urq] Re: [20v] 7A vs 3B C/R
>
>
> Sure, you always need to back up info..the one thing that concerns me, the
> original compression differences that he listed and attributed to the head
> cc are exactly the differences that I know are made up for in the
> pistons...thus, I'd suspect that he has not measured and is
> making
> assumptions, but that's _my_ assumption, so there you go  =)
>
> Thanks,
> Javad