you extend the inner pipe about 3-4" past where the water enters the pipes.or just go full dry.

Steve Damon out of Little Valley NY. He used to run the "one hot tomale" car. He had a ton of marine motors in the shop and came highly recommended.

For the record- I have not called him with my concerns yet. I am going to call him tomorrow and ask him to put in the cam I asked for. As of right now the issue has not been addressed. I have just been trying to figure out if his cam will be ok.

Just to clarify, I am not running Merc exhaust. I am running EMI manifolds with these risers. I know they are better than stock, but how much better?

I think I would revisit the builder and ask for a warranty in writing while expressing your concerns. He didn't follow instructions and billed 25% over estimate. If he refuses I'd change the cam and out him.


oops , guess I was too slow.

By law, I'm only allowed to be within 10% of estimate without approval.

Did you see my post this AM:

Comp 11-314-4 280ah-10 Hyd Flat Tappet
232°, 237° at .050"
Valve Lift .547", .547 "
LSA 110°
14.5° Overlap at .050"

Crane 134561 H-296-2 Hyd Flat Tappet
236°,246° at .050"
.553", .571"
LSA 114
13° Overlap at .050"

Part Number: CRN-132561
228, 236 at .050"
0.530", 0.551".
LSA 114
Overlap at .050" 4°

Sutphen 30, Thank you. "you extend the inner pipe about 3-4" past where the water enters the pipes" That is exactly some of the mods Eddie at Young Performance and I discussed on Friday as he will be reworking my Stainless Marine Tails.
Sorry for the off post-kinda-replies.
On Post,
Better Cam? What does that mean? Structural, Longevity, HP, Torque, Easy on Lifters and Valve Train, RPM range for Tq/Hp, Flow velocity Volume?
Better for whom?

I did but don't remember seeing the info on the 132561 cam. The difference between the 134561 and the 11-314-4 is not very much. The difference between the bigger cams and the 132561 is significant.

i did exactly that with the identical exhaust on a 516 cu in build i did that used a hp500 cam and it still got reversion,switched to a different exhaust and no more reversion.the new exhaust was dry to the tip.i know of several boats running the cam the op asked and paid for with no reversion issues,imo the fix for this is to install the cam the op asked for in the first place.with the engine on a stand it should not take more than 3 hours.

the hp500 cam,was it a carb'd version or efi?carb'd version was known to revert.