Aftermarket/Replacement Cylinder Head Rule Change

PJ305 · 12-24-2017, 11:43 AM

I have a question for whoever dreamed up the need for replacement heads for SBC engines. How do you think it is easier to find a 624 head for a 1986 350 truck than a 1979 Chevy car with a 350? How did you determine 62-79 SBC are the only engines affected? I also like to know how we are going to shrink an intake runner from 185cc to 172cc legally? MERRY CHRISTMAS & HAPPY NEW YEAR

HR9121 · 12-24-2017, 12:28 PM

Quote:

Originally Posted by PJ305

I have a question for whoever dreamed up the need for replacement heads for SBC engines. How do you think it is easier to find a 624 head for a 1986 350 truck than a 1979 Chevy car with a 350? How did you determine 62-79 SBC are the only engines affected? I also like to know how we are going to shrink an intake runner from 185cc to 172cc legally? MERRY CHRISTMAS & HAPPY NEW YEAR

PJ I think this one even has us Chevy guys scratching our heads, no pun intended!

TILBURG · 12-24-2017, 05:27 PM

Quote:

Originally Posted by PJ305

I have a question for whoever dreamed up the need for replacement heads for SBC engines. How do you think it is easier to find a 624 head for a 1986 350 truck than a 1979 Chevy car with a 350? How did you determine 62-79 SBC are the only engines affected? I also like to know how we are going to shrink an intake runner from 185cc to 172cc legally? MERRY CHRISTMAS & HAPPY NEW YEAR

^^^^^^
What he said but it's 165 or less 🤔🤔

Super Sport · 12-24-2017, 08:15 PM

Better yet how about shrinking them down to 140 ccs. The new replacement heads are legal on early 327's with the 520 and 896 heads. What??????

Timetraveler · 12-24-2017, 08:44 PM

The 520 and 896 heads were used in 62-63-64 on the 327/250 and also on the 283 2bbl and 4bbl.

PJ305 · 12-24-2017, 09:31 PM

Quote:

Originally Posted by Super Sport

Better yet how about shrinking them down to 140 ccs. The new replacement heads are legal on early 327's with the 520 and 896 heads. What??????

Yeah the 62 327/250hp has 1.72 intake valves as well. I don't even think the best cylinder head guru on the planet could shrink 185cc runners to 140cc , not to mention 2.02 valve to 1.72 legally...lol

12-24-2017, 11:43 AM	#1
PJ305 Member Join Date: Jul 2007 Posts: 137 Likes: 0 Liked 5 Times in 4 Posts	Re: Aftermarket/Replacement Cylinder Head Rule Change I have a question for whoever dreamed up the need for replacement heads for SBC engines. How do you think it is easier to find a 624 head for a 1986 350 truck than a 1979 Chevy car with a 350? How did you determine 62-79 SBC are the only engines affected? I also like to know how we are going to shrink an intake runner from 185cc to 172cc legally? MERRY CHRISTMAS & HAPPY NEW YEAR

12-24-2017, 08:15 PM	#4
Super Sport Junior Member Join Date: Nov 2005 Posts: 73 Likes: 0 Liked 1 Time in 1 Post	Re: Aftermarket/Replacement Cylinder Head Rule Change Better yet how about shrinking them down to 140 ccs. The new replacement heads are legal on early 327's with the 520 and 896 heads. What??????

12-24-2017, 08:44 PM	#5
Timetraveler Member Join Date: Aug 2002 Location: Florida Posts: 103 Likes: 79 Liked 12 Times in 6 Posts	Re: Aftermarket/Replacement Cylinder Head Rule Change The 520 and 896 heads were used in 62-63-64 on the 327/250 and also on the 283 2bbl and 4bbl. Last edited by Timetraveler; 12-24-2017 at 09:18 PM.