AFR 210 LT4 heads
Thread Starter
Le Mans Master
Joined: Jul 2000
Posts: 7,639
Likes: 326
From: Greenville SC
AFR 210 LT4 heads
AFR 210 LT4 heads with 2.08/1.60 valves, would these be to big for a daily driver 350 6 speed, how about a 396? I know you would lose some on the low end, but how much, and wouldn't you pick up a lot between 3k-7k?
Le Mans Master
Joined: Jul 1999
Posts: 8,683
Likes: 6
From: Phoenix AZ
Originally Posted by 95wht6spd
AFR 210 LT4 heads with 2.08/1.60 valves, would these be to big for a daily driver 350 6 speed, how about a 396? I know you would lose some on the low end, but how much, and wouldn't you pick up a lot between 3k-7k?
Le Mans Master
Joined: Jul 1999
Posts: 8,683
Likes: 6
From: Phoenix AZ
Originally Posted by 95wht6spd
Yes, I have to pass emissions. Would it pass with Random Tech cats and a 306 or similar cam, or would it just put out to much for the cats to handle?
Advanced
Joined: Aug 2004
Posts: 95
Likes: 0
From: Kansas City MO
210 afr heads
i finally listed myself... are you going to sell the 210 you have? i'm building a 383 and i have a set of 190 TPIS AFR heads with the smaller intake valve and i might sell them. if you sell let me know or if you need a smaller head maybe when can work out a trade. 
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
I run CNC ported stock LT4 castings...intake port is 219 cc.
My flow numbers are similar to AFR 210's...
I lug my engine at 1200 rpm all day. Is there less punch than stock...yes, but with my GM 847 camshaft...I tend to lean toward the cam loosing more lowend than the heads...as I ran these heads on my stock LT4 shortblock too with even better results on the lowend.
GM 847 does give me fits <2000 rpm for drivability problems...the engine wants a richer mixture and tends to have a lean stumble in this area...no way to force a richer mixture than factory commanded 14.7...as far as I can figure out. It does pull to 6900 rpm!
My flow numbers are similar to AFR 210's...
I lug my engine at 1200 rpm all day. Is there less punch than stock...yes, but with my GM 847 camshaft...I tend to lean toward the cam loosing more lowend than the heads...as I ran these heads on my stock LT4 shortblock too with even better results on the lowend.
GM 847 does give me fits <2000 rpm for drivability problems...the engine wants a richer mixture and tends to have a lean stumble in this area...no way to force a richer mixture than factory commanded 14.7...as far as I can figure out. It does pull to 6900 rpm!
