Ported 250cc Allpro heads bare
02-23-2010, 12:23 PM
#1
TECH Enthusiast
Thread Starter
iTrader: (21)
Join Date: Mar 2003
Location: San Antonio Tx
Posts: 705
Likes: 0
Received 0 Likes
on
0 Posts
Ported 250cc Allpro heads bare
I have a pair of ported Allpro heads, bare. I will through in 2.08in and 1.60ex valves but the machine shop said the 2.08in valve was a little on the small side for this head. I ran them on my 408 for a year with no problems. I just got them back from the machine shop being cleaned and surfaced. They have 7/16 rocker stud holes, bronze valve guides, .750 thick deck. Great for boost. They are 71cc w/250cc intake runner. Ls2 style head. Flow numbers are on Allpro's website as follows:
Intake
100 = 71
200 = 149.2
300 = 221.9
400 = 273.7
500 = 317.2
600 = 338.3
700 = 351.3
Exhaust
100 = 49
200 = 100.3
300 = 150.9
400 = 187.1
500 = 209.2
600 = 223.9
700 = 240.1
1600+shipping.
Intake
100 = 71
200 = 149.2
300 = 221.9
400 = 273.7
500 = 317.2
600 = 338.3
700 = 351.3
Exhaust
100 = 49
200 = 100.3
300 = 150.9
400 = 187.1
500 = 209.2
600 = 223.9
700 = 240.1
1600+shipping.
Thread
Thread Starter
Forum
Replies
Last Post
BennyB
GM Parts Classifieds
15
08-01-2015 08:48 AM
