valve to piston clearance help

[Johnny Chimpo]

Hello I have a 1975 360 .030 over stock type replacement pistons heads were shaved .040 comp xe274h cam dropped this into a 74 scamp had a rod knock about 10 minutes after starting it(last time I buy a used motor) but no top end noise and all looked good on disassembly .I have since had the bottom end rebuilt, pistons were good so just new bearings and rings had another set of heads(596's) gone over and shaved .040 was putting it together today and found that the intake valves are hitting,does this sound right cam only has 488 int and 491 exh lift.My thought is that the shop my have shaved to much off the head I will check tomorrow battery in the calipers died.From what I have read this combo should work I see people running bigger cam on stock bottom ends with shaved heads or am I wrong.

 

[IQ52]

Recheck the cam timing also. If the cam is way advanced it will decrease the intake valve clearance.

 

[rumblefish360]

Use a small amount of clay to check. I skipped this once and the valve was so close to the piston, while running, the carbon didn't have enuff room to get on the piston.

 

[Johnny Chimpo]

Thanks for the input I found the problem once I pulled it apart today only out the price of gaskets must have moved the crank gear and had it on the wrong key way (man do I feel dumb) lol I must be special.

 

[rumblefish360]

I installed the crank gear wrongly a few times. It is easy to make this mistake when you do not do this a lot.