.530" lift, stock type pistons, 1.90 valve. Too much lift?

[Jason 302]

I have AFR 165's coming, and a Trick Flow #1 cam I've been running the last year. I have to buy some stud mount rockers and was considering buying some 1.7 ratios. The total lift would come int at .530" intake/.542" exhaust. The springs are good for .550" so I'm good there, so here's some questions.

1. As the title asks, do you think I'll have any P/V clearance problems?
2. I plan on shifting around 5600-5800, would 1.7's increase valve float problems?
3. Are 1.7 rockers harder on valve guides?
4. Would these heads even benefit from extra lift beyond .500"?

I'm not too worried about valve float, my springs set up on my stock heads were only 100 lbs. and I shifted all day at 5500-5600 without valve float. I stuck with the standard package on the AFR's at 120 lbs.

EDIT: The pistons are forged Speed Pro's w/stock valve reliefs.

 

[bock]

i have tfs tw 2.02 1.60 heads. and a f-303 cam with .512 of lift.

the clearance above .100 on both valves.if it can help.

 

[nmcgrawj]

Max lift as very LITTLE to do with p-v clearance. It is all about the duration and where the valve is in comparison with the piston

 

[shttygtstang]

i have f 303 with 1.7 roller rockers and edelbrock heads no probs on stock bottom end

 

[281pony]

i think .543 would be pushing it, you wont know for sure unless you to a clearance test. why not go with a 1.6 rocker if your unsure?

 

[5spd GT]

I would go with the TFS Stage 1 and the 1.6RR's...many run this with no problems...on their AFR/Trickflow/etc...setups...

Lift is a factor in p-v clearance problems...

Oh and just so you know I have .560 lift on my cam...with my AFR's (58cc) 1.9in intake/1.6 exhaust...upgraded springs/studs/viton seal upgrade...

 

[Jason 302]

I don't think .543" on the exhaust will be as much of an issue because the valve is so much smaller. .530" on the intake is what I'm concerned about. I first planned on getting 1.6's until the idea of more power came up with the 1.7's. I can try the 1.7's (I have some light checking springs) and if they cause trouble I can just send them back and get the 1.6's. One question I forgot, what is the minimum clearance that is acceptable?

 

[5spd GT]

.080 on the intake/.100 on the exhaust...some look at it is .100 on the intake-.125 on the exhaust...