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Cal H
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Discussion Starter #1
Just got a call that my cyl head is ready. I had taken it to a Tim Engel endorsed machine shop in the middle of the corn fields LOL. The head was done over a period of time with the no hurry option over the winter months to keep costs down. Still on track and on budget.
 

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1,321 Posts
Truly great news...congrats Cal! She's one step closer to being back on the road.

If Tim recommended the shop, I have no doubt :)

Roy
 

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There are a lot of good machine shops here too, but the problem with the Lotus head is that there are no flat surfaces for a machinist to hold on to. Also the cams are not attached, so it is very easy for a machinist to loose their registration for setup, especially of the head were warped to begin with.

In my case I had to design and make a fixture to hold the head upside down by the cams, so that the head surface could be machined parallel to the cams. Most machine shops won't have that fixture... The shop that I used, to finally fix my head, saw the fixture that I made and said "looks like you know more about this than we do, so you can use our head surfacing machine for free".
 

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Cal H
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982 Posts
Discussion Starter #7 (Edited)
AARON'S PRECISION MACHINE
24014 OLINDA TRL N,
Scandia, Minnesota 55073
651-433-4219

Aaron used to have his shop in the east midway area of St. Paul but when they started to tear the roads up for the commuter rail corridor he moved his entire shop to a pole barn structure in a rural farm area of Scandia, MN. Many of us used to drive through Scandia on the way to the wings and wheels show in Oceola, WI. Aaron runs pick up service for his regular commercial customers in the St.Paul/Minneapolis area to his shop Personally he is into motorcycles, snowmobiles, boats and anything with a motor that goes fast. So he likes working on those items. He is a one man operation so the buck stops there and so the success or failure of the job lies with him. Tim says he does good work on the 907, 910, and 912 heads. Tim also recommends 2 other places in the Twin cities metro area but they do cost more as they are shops in the metro area. Tim has never steered me wrong so I have a tendency patronize places he recommends. I actually spent some time talking to Aaron and I trust a fellow motorhead and performance enthusiast who can talk car. Tim did mention if I did not like Aaron and if I wanted to get real exotic there was an out of town specialist to port, polish and flow the head. I told Tim I just wanted a machine shop capable of cutting in the slightly larger than S4s valves.

Aaron's is getting booked up now as the weather warms up and priority projects are at a premium as the race season starts for cars, motorcycles and boats. On Tim's advice I took the head to Aaron in late Nov during the beginning of the traditional slow period of his shop. He worked on the head here and there as his time permitted. Contacting me and adding items to the shopping list as the weeks went by. Aaron at times would take a 7-10 day pause waiting for parts so it was a relaxed pace concentrating on doing the job right and giving me time to acquire the parts below market pricing by calling in every favor and for old times sake one shot pricing. I think with customs duty the intake valves were $15 ea. and the exhausts were almost $30 ea. Particular suppliers had much better pricing for certain items so I ended up split ordering items from the UK and the balance from JAE to remain on budget.

My dash veneer was not able to be saved as it delaminated so I will make a CF dash and will also veneer the existing dash to see which one looks better. So walnut, maple, or rosewood is the finish choices.
 
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