del91_305

I am the proud new owner of a 1987 Iroc with 305 TPI. I notice under heavy acceleration in the power band of second gear, i can hear valves rattling. Is mine a Roller Motor or not? If so can valve las be adjusted?

Boosted_SS

it can be a roller motor but i believe that they came factory with flat tappet lifters. they have the holes in the valley for the spider that holds the lifters down but i don't think they are actually installed. 87 was the last year they weren't roller lifters from the factory i believe

Fast92RS

iTrader: (2)

I think all 87 up motors got roller cams.

Boosted_SS

i know the 87 blocks at the very least can be made roller very very very easily and they really are the same block minus two holes in the lifter valley to hold the lifter spider down. the holes can be drilled very very easily

doc

The factory lifters are hydraulic roller lifters, so the cam is a roller cam.

mnorton

Yes it's a hydraulic roller engine. Yes you can adjust the valve lash in the same manner as a hydraulic tappet engine.

AaronIROCZ

iTrader: (5)

It depends My 87 GTA has a "roller" block but had a flat tappet cam and lifters. All I had to do was drill and tap the holes for the spider hold down.

Boosted_SS

exactly what i was trying to say

if you all don't know what I'm talking about i can take pics in the next few days to point out what i am taking about i have a spare block laying around.

mnorton

That's interesting. Never the less, the valve lash can be adjusted on either type of lifter. You may want to think about installing new valve springs as well.