Posted by Chris Case [75.36.45.84] on Sunday, December 02, 2012 at 13:19:39 :
In Reply to: High Compression WC/M37 Head posted by Vaughn [108.204.183.239] on Sunday, December 02, 2012 at 09:57:51 :
The 18xxxx number, the auction ending in 891, is the one I'd go for. Note the smaller clearance around the intake valves? That is a factor beyond compression. It supposedly helps with air flow.
That gives me at least 10 casting numbers in my notes. Though I haven't been taking/saving pics. I'm thinking the 16xxxx heads were probably good too. Casting number seem to be sequentaily / year. Higher # = later design.
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