Ground Pounder Street 470

MRL Performance said

The E street heads are the same as the RPM, the only difference is the valve seat material. Its more for street driving rather than racing. No big deal. I have used about 5-6 sets without any issues.

Solid rollers last just fine on the street with our lifters. I designed them to run on the street as well as the race track. I have never had to rebuild a set of our lifters. I had a customer send a set back for inspection after an entire season of short track sprint racing. Everything still looks good as new after 1200 race laps and 700# spring pressure.

Dont know anything about the ProComp rockers, never used them.

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I ordered a set of the E Street 75cc heads. I just got looking at Summit's website and there is a Note "Designed for use with hydraulic flat tappet camshafts. The valve and seat combination is not recommended to be used with a hydraulic roller camshaft" This note was not on the Edelbrock website.

Of course, I do have a comp 236/242 541/544 hydraulic roller cam. I use comp 26120 beehive springs which are 155 on the seat and 377 at .600 lift. I assume your spring package is probably stiffer. Do I need to worry about the seats? This engine is for street use and occasional drag racing and will also not see much over 5500 rpm.