i have a 91 tpi motor from a z28, .40 over hypert, flat top pistons, comp cams xr256hr , 487-495 lift, 212-218 dur, .006 264-270, comp cams 1.52 magnum roller tips, 24lbs, afpr, edelbrock hiflow base, vary ported slp runners, bbk 52mm, ported plenum, chip burned by jimsperformance.com, looking for some new heads, but not sure what ones will be best, can anyone help!?

 

i aslo just got a nx nitrous kit, i would like to run this summer, what show should i run and what heads will help with the nitrous?

 

If money is no problem, go with AFR's. either the 180's or 195's

 

yeah ive been looking for some used afrs, i found a set of 190s a lil bit ago but didnt knwo enought on what i needes or wanted to get them. why dont you think the 190s or would they be good to? i dont think i have ever seen any 180s for sale used, they must be the more popular hu?

 

what kind of compression would be good to run with this motor? ive been told to use the fel-pro shims 4.100"x .15, said that will help with compression, what should my compression be at now?

 

Any of the Afr's would be fine, you just don't want to go past 195 with your combo. I forget which ones they actually have. 180 and 195 were just what came to mind.

There is a formula to figure out compression ratio, i'm sure it is on TGO somewhere

 

If you're planning on buying a new TPI base anyway, some vortecs would be worth looking into. With the cam you have it probably wouldn't be nessecary to go with large runner vol, and there may actually be some advantage to the 170cc runners of the vortec heads.
And it's possible that a set of stock vortecs would work with your combo without modifications, which would mean a cost savings to you since vortecs are so inexpensive.

 

Press in studs, and the springs will definitely need changed, and he'll have to cut the valve guide down. Running .452" lift on mine, and I am JUST under the recommended guide/retainer clearance. I'm not running a motor that is high RPM, so I didn't worry about it.

Fast burn chambers are awesome, but the Vortec TPI base cost, plus their stock "weaknesses" add to more cost/hassle, that you won't run into with other aftermarket heads.

 

well im looking for some used arf 180, 190, or the 195s then im also looking for some trick flows......what truck flows would be good to look for? also will i need longer push rods or anythin like that with a head swap with these heads?

 

I used retrofit roller lifters, so yes, I had to change pushrod length.