yalincoln (1/12/2012)
hi ted, you'll want to mic. the comp. pads on those ECL heads. they used two diff. heights. also, how were they getting 62cc heads on the 56 nascar engines shown in the specs. sheet i posted. they don't list head casting #, thanks.Wayne. The ECL-C heads that were donated to the cause measure out at 0.990” at the pads on one of the heads and 0.995” on the other. And both of these heads look to have only been cleanup milled in the recent past. Unfortunately upon doing a closer examination of these heads, the exhaust seats have been too heavily ground on to be of use without new seats being installed. Due to the cost of fixing the heads without any future use for them other than a dyno test, the ECL-C heads will not be included in the next round of cylinder head testing. That’s too bad as these heads have what appears to be some nice port work performed on them.
As an FYI, I have a pair of ECL- B heads off of a 1955 182HP Special 272 that measure 0.975” on both heads at the pads. This pair of heads looks to be an unmolested set that have never been off the engine until I tore it down. If I read the 1955 service bulletin correctly, the ECL-B’s were unmilled (1.000” pads) on the 1955 292’s and milled to 0.960” for the 1955 HiPo 272’s.
For the head test that’s been taking place on the ‘312’ dyno mule, there is a particular set of G’s that have been cut down so that they are 53.75cc’s. And this is a set of G’s that were originally unposted and have had supplemental ‘posts’ added. A different set of G heads that are being used for the exhaust system tests were milled to 62cc’s. So milling a set of heads to get down to 62cc’s is quite doable.
Lorena, Texas (South of Waco)