You have to get more specifics from the builder. If I just paid a guy to put an engine together that could soon blow up and waste my money, I would have a lot more questions. To say one cam "brand" is more or less favorable should deserve a sit down conversation with an answer that elaborates a LOT more on the problem and not "just because".

The fact that you are going to spend probably $500 to $1500 by the time its all done with shipping cost to get your tails welded isnt the right fix to the root cause. You shouldnt have to do that. Matter of fact, it shouldnt even be an option.

Compare the EVC timing events of the 2 cams. The longer the exhaust valve is open while the piston is travelling down, the more reversion you can get. Next question after that is did he degree the cam "straight up". It is possible he advanced the cam some to reduce evc angle and therefore reversion.

The fact that there are so many "what ifs" with his cam makes me not want to bother. It's getting the cam I specd one way or another. 60 posts and not one person said his cam will be fine.

I have an extra oil pan gasket. The lifters that came with the shortblock are still in the box so I could use them with any cam. I would just have to buy a timing cover gasket and the cam. So even if I have to eat it I will. For $160 in parts I am going to swap it.

Kinda boggles my mind as why he would use a cam meant for NA in a blower motor? I am sure comp cams even has a better cam than that. I ran a 110 LSA on an NA motor with the same exhaust, difference being the tails were modified by EMI with reduced water discharge. It did not revert, the cam was solid roller large duration 255/265 and around .650 lift.

Comp sells a forced induction cam that is identical to the one he put in except it's on a 114 lobe sep.

When I spoke with him he said "you'll be happy with it. It will make 510hp" I said that I am supercharged with 5psi of boost. He replied " oh you'll make 620 then". Like he forgot I was running a blower.

builds real confidence.

All else aside 2 big mental factors for me would be:

1) Every time I did an all out run I would wonder "How would this thing run with the engine I designed?" I would never get over that until I changed it back to my build.

2) If it reverts with my build, I own it and it is my problem. If it reverts with his cam I would ALWAYS feel "You sonsa-a-beach!!!", I should have known better!

Of course on Monday with your discussions with him maybe he can shed satisfactory insight.
Best of luck and let us know what he says.

Yeah, not cool, so with a small blower like that he just adds 110hp?