can you run trick flow heads on a 305 tpi?

thanks

 

NO, These heads are 64cc chambered, and your 305 is 58cc. You would drastically lower your compression ratio. In addition, I think the 2.02 valves would hit the side of the cylinder wall. You need 1.94 valves.
Look towards something like the World Product S/R Torquer 305 heads (perfectly legal), or Corvette Aluminum heads (need to set up a Corvette style EGR system).

------------------
Rob
'86 TA 305 TPI

 

The world Products S/R heads are not a good choice for an upgrade. The S/R stands for "stock replacement" and the specs match the stock heads so how can anyone consider them an upgrade?



------------------
86 Camaro Sport
383 Speed-O-Motive Crate Engine, Trick Flow Twisted Wedge G2's, 58mm Accel TB, 3.73 Auburn Pro, SLP Cold Air Induction and Headers, Dynomax Cat-back, Serpentine Belt Setup, Dual IROC Fans, Jamex springs, 16" IROC Rims, 36mm/24mm Sway Bars, Global West Steering Brace. Hotchkis Rear LCA's,Panhard Bar and SFC's.
http://www.sethirdgen.org/octride.htm

 

If you can find a set of original Twisted Wedge G1 heads they will work great. CHP ran a comparo on all the available heads back in the summer of '95 and the TF's smoked every other head that would fit on a 305. I bought mine back in Dec '95 and ran them for 50K miles on my LB9. (BTW, I'm still running them on my ZZ4 shortblock.)

With the G1 head (this doesn't apply to the newer G2s) the valves won't hit because the chamber is turned. Only the exhaust valve is in any danger and that is with lifts in excess of .65". So there's no real danger.

As was pointed out, you will lose some compression with the 64cc chamber, down to ~8.5:1. I ran mine that way and I'm sure I didn't give up much HP. If CR is an issue you could get a machine shop to shave off a little extra to bring the CR back up when you get them decked.

------------------
Mike

'90 IROC-Z , 5-speed, ZZ4, G1 Trick Flows
Moderator SEThirdgen

 

how about the vortec heads will the work? i'm going with new pistons so the 64cc chamber will work it will give a 9.4 CR.