Cracked head?!

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k5krazy

k5krazy

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Soo I have (had) an ESP ported 29cc 2 bolt head in my 5ive with about 3 gallons through it. I installed a DDM dominator pipe and was running with the body off to get a tune, and less than 10 minutes into it my 5ive started running oddly. I killed it and on restart felt something grinding. Long story short the coil moved and was on the flywheel. I thought I was in the clear until I noticed the crack in the head. I did have one minor body off rollover, but it was a few minutes before it died. I kept my old parts so I returned the engine back to stock. Has anyone else had this happen?
 

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I don't know if it was roll over related or not. It ran fine for a few minutes after the roll. I would've figured the stress would have been on the exhaust port from the pipe. Mine cracked on the intake side. Stupid question but the 4 bolt heads are stronger in that area right?
 
Yes I had the same issue.. A esp 2 bolt and only got one tank and cracked just like yours. I'm going to play with em again because it was a killer motor. Doug gave me a few tips how to reenforce the 2 bolts. Its common with 2 bolts.
 
I really liked the way that ported ESP ran. Back to a stock 26 with a DDM pipe I think the ESP with the stock can would outrun it. I was worried that the crack was common. How do you reinforce the head?
 
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