Aftermarket heads in SS

Ed Carpenter · 12-26-2007, 10:45 PM

I see NHRA is allowing RHS,Dart,and World Products heads on the 327 combo's now (rated at at higher HP 304 instead of 299). My question is if their going to do this for the 327 why not the 283 also. Are 327 cores that hard to find?

Ed Carpenter

66 Chevy II

4244 SS/I

FlyingW · 12-26-2007, 10:59 PM

Yes they are that hardto find. They have been race motors since day of creation unlike the 283.

Jeremy Waibel

SSDiv6 · 12-26-2007, 11:02 PM

The premise they are using for their acceptance is the poor quality of the old castings, which it is questionable since you can replace seats when they are recessed. One claim is old castings are difficult to repair and weld too.

Dick Butler · 12-27-2007, 07:45 PM

Best yet would be one set of heads replace ALL small block heads. Same cc, and ports. Cuts cost to by replacements and only one set of specs to inforce. (could use one casting with appropriate ccs etc) for car.
If all can run one 3 speed trans what is the difference of same heads for all. It makes it simpler to tech too.

12-26-2007, 10:45 PM	#1
Ed Carpenter Live Reporter Join Date: May 2006 Location: Dripping Springs, Tx Posts: 2,709 Likes: 186 Liked 520 Times in 132 Posts	Aftermarket heads in SS I see NHRA is allowing RHS,Dart,and World Products heads on the 327 combo's now (rated at at higher HP 304 instead of 299). My question is if their going to do this for the 327 why not the 283 also. Are 327 cores that hard to find? Ed Carpenter 66 Chevy II 4244 SS/I

12-26-2007, 10:59 PM	#2
FlyingW Member Join Date: Apr 2007 Location: Frostproof, Fl. Posts: 450 Likes: 0 Liked 1 Time in 1 Post	Re: Aftermarket heads in SS Yes they are that hardto find. They have been race motors since day of creation unlike the 283. Jeremy Waibel

12-26-2007, 11:02 PM	#3
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 3,043 Likes: 712 Liked 1,577 Times in 581 Posts	Re: Aftermarket heads in SS The premise they are using for their acceptance is the poor quality of the old castings, which it is questionable since you can replace seats when they are recessed. One claim is old castings are difficult to repair and weld too.

12-27-2007, 07:45 PM	#4
Dick Butler VIP Member Join Date: Oct 2002 Location: Richmond Indiana Posts: 1,196 Likes: 5 Liked 32 Times in 19 Posts	Re: Aftermarket heads in SS Best yet would be one set of heads replace ALL small block heads. Same cc, and ports. Cuts cost to by replacements and only one set of specs to inforce. (could use one casting with appropriate ccs etc) for car. If all can run one 3 speed trans what is the difference of same heads for all. It makes it simpler to tech too.