AFR or Allpro heads
Originally Posted by cary et performance
We are already there with our cylinder head.
In race trim our Cathederal port head is 403 cfm@ .750.
2.150 intake valve on a 4.125 bore. 50 degree seat.
2.100 on a 4.00 bore was 376@.700 45 degree seat 265cc
2.125 valve 4.100 bore was 386@.700 45 degree seat 266cc 357@.550
1.570 exhaust valve 282 @ .800 with a 1 7/8 pipe. 248 no pipe.
In race trim our Cathederal port head is 403 cfm@ .750.
2.150 intake valve on a 4.125 bore. 50 degree seat.
2.100 on a 4.00 bore was 376@.700 45 degree seat 265cc
2.125 valve 4.100 bore was 386@.700 45 degree seat 266cc 357@.550
1.570 exhaust valve 282 @ .800 with a 1 7/8 pipe. 248 no pipe.
I need to call you guys
Brad
flow on stock bore with etp heads
Originally Posted by JL ws-6
Those are impressive #'s for sure. How do the heads flow on a stock bore.... or are these heads only for large CI applications? Other then wanting the absolute best head on the market.. I really don't have my heart set on anyting yet.
Also, your heads... if used on a stock CI motor, what kind of cam are you reccommending.. how big is needed to maximize teh flow rates of the heads? Port size for smaller CI any different?
Also, your heads... if used on a stock CI motor, what kind of cam are you reccommending.. how big is needed to maximize teh flow rates of the heads? Port size for smaller CI any different?
At this point we have only worked with one valve size on a stock 3.900 bore, and that was a 2.040. It flows 327@.600 ( that was flowed on a 3.900 bore) and is 215cc. AS far as camshafts, I leave that up to our dealers and the guys that have a lot of testing under their belts. All heads will come fully cnc ported for our stock port volume is 160cc before machining. this allows us to make 30 different itterations out of the same head. The price will be pretty nice to boot. BTW I wasn't sure if you were referring to a stock 3.9 bore or a stock 4.0 bore. Our 227cc 4.0 bore head with a 2.08 valve flows in the high 330's @.600 lift
I was referring to a stock 3.9 bore, as the plan is to stick with a 346 for now. What kind of combustion chanbers are you looking at CC wise? Also, how thick is the deck height, is it thick like the AFR to hold the heads down better for nitrous and boost applications (I assume they are)
etp heads
Originally Posted by JL ws-6
I was referring to a stock 3.9 bore, as the plan is to stick with a 346 for now. What kind of combustion chanbers are you looking at CC wise? Also, how thick is the deck height, is it thick like the AFR to hold the heads down better for nitrous and boost applications (I assume they are)
the chamber volume can be from 40cc up to 76cc. the 76cc has a thicker deck than standard. up to .825. we have also reduced the number of core prints in the deck(coolant steam holes) by two thirds. No more haed gasket issues at the end of the head between the chamber and end water passages. other than the ends the only other water passages through the deck are four in the middle. Hope this helps
cary
