What roller rockers is everybody using for these heads. It's a 1990 corvette tpi. Just hoping to pick up some knowledge. Looking for somthing cheap. I'm thinking stamped roller tip so I can fit under stock value covers. But I'm not sure yet. What should I get. Full roller or roller tip? Self aligning? Or run guide plates?

 

If your heads have guide plates then use guide plates and non self aligning (NSA) rockers.

Roller tip rockers really are not that great. Not really worth the price. If you can find a good deal on used ones sure go for it, better than stock, but not worth the $120-180 price tag.

If you got to buy new, I would go with a good brand full roller. No proform, pro comp, etc.

Only comp cams, crane, luntia, howards, harland sharp, scorpion.

 

I just want the increased lift. That I heard a 1.6 will give. Figured roller tip would be cheap and increase power. Will full roller 1.6 increase power over roller tip 1.6

 

Anybody

 

full roller rockers are big. in some cases you find that they wont fit under the valve covers, meaning you need those butt ugly tall ones, THEN your accessory brackets may not fit. it can get to be a real PITA fast.

 

Yes a full roller will give you more gains than a roller tip will. Don't look for big 40 HP gains or nothing like that, but I could see a good 15-20 HP gain from the full roller, bigger ratio rocker arm

 

Ok. So what rockers do I need? Can u give me a part number of what u recommend

 

?

 

You mentioned guide plates in your 1st post.

Do you have guide plates or no?

Here is ones for use with out guide plates, and narrow body to work with most stock center bolt valve covers.
http://www.summitracing.com/parts/sc...make/chevrolet

Here is ones for guide plates and most stock center bolt valve covers
http://www.summitracing.com/parts/sc...make/chevrolet


If you want just the roller tip rockers for $100 less then here is ones for use with out guide plates
http://www.summitracing.com/parts/cc...make/chevrolet

And here's the roller tips for use with guide plates http://www.summitracing.com/parts/cc...make/chevrolet

 

Thanks you. I'm going with fully roller

 

Any recommendations for a cam for this car? I want the most ratical i can get on a stock motor

 

The L98 heads do not flow very well past .500" lift. So no real reason in looking at big lift number cams. It will just be valvetrain stress with no real gain.

.490" to .515" max lift range

But duration and LSA matters more than lift anyway.

The duration must match your compression and engine size.. What engine do you have?

Here you say 350, in another post asking this same question you say 305?

I know you want the wild race car sounding car, but it's gonna kill off what power you do have.

With your 9.5:1 305 the biggest I would run would be something like a 218/224 @.050" with a 110 or 112 LSA.

These cams would work good.
http://www.summitracing.com/parts/cc...make/chevrolet
http://www.summitracing.com/parts/is...make/chevrolet
http://www.summitracing.com/parts/hr...make/chevrolet

You can go bigger but you will kill power. The 305's tiny bores can't move air at high RPM so why use a big cam to shift the power up to a higher RPM range that your engine can't breath at.

If it is a 350 with 9.5 to 10.0 compression then you can go about 5-6 degrees bigger and be ok

 

first off, are these Corvette, ZZ3 or ZZ4 "113" heads? what year is the motor? Is this a Corvette motor? the "113" heads can fit just about any small block chevy block but cams for 86 and older cars are all flat tappet cams, 87-95 truck blocks are also flat tappet cams but can be drilled and tapped to the run a factory style roller cam, 87 and up car blocks are roller cams. Corvette, ZZ3 and ZZ4 all use the "113" castings, the main difference is the valve springs. I know ZZ3's came with valve springs only able to handle .510" of lift where the ZZ4's can handle .530" of lift because they actually have LT4 hot cam springs. im not sure if the corvette heads have spring that can handle past .480" of lift or not, ive never researched them.
I found a ZZ3 in town that a guy had for sale for $300 so i bought it. the cam specs on a ZZ3 and ZZ4 are the same. 208*/221* @ 0.050 lift and .474"/.510" of lift with 1.5 rockers. this cam is start of the end of a stock TPI's RPM range. a ZZ3 emission legal conversion is good for 308 horsepower around 5,100 RPM with a carb but on a TPI the peak horsepower in emission legal trim is about 290-300 horsepower around 4,900 RPM. unless your TPI is modified a ZZ3 is about the biggest you wanna go assuming you have a roller cam block. plus anything bigger in duration requires gears and a torque converter. LT1 cams are cheap and dont require new valve spring for the .450" of lift the cam has. also i bought a set PRW roller tipped, self aligning (because i dont have guideplates) rockers for my ZZ3 1.5 ratio. 1.6 ratio would bind my valve springs. for about $120 they are chromoly, thick and very strong. not full rollers but way better than stamped steel ones

 

This is a 1990 corvette. Do u have part number for the zz3 cam and springs?

 

Now if anyone reading this could help me with my exhaust post

 

zz4 cam part# 10185071 ZZ3 and ZZ4 had the same cam, if i were you id upgrade to LT4 hot cam springs... whats your exhaust problem? D port heads?