These cast iron heads are what I started learning on 5 years ago when I bought my flow bench and initially I bought 1 x cylinder head as a sacrifice head.BobbyB wrote: ↑Sat Jul 30, 2022 9:19 amGreat job Steve! Please tell us your thought process behind the small head & small valve that you are using.steve cowan wrote: ↑Sat Jul 30, 2022 5:48 am For anyone interested,
Have ran car over last few weeks.
Had a run tonight.
New 255/60/15 R series radials.
Backed up cam timing 4 degrees so cam is straight up 109 - 109 .
Car responded with a mph increase to where it should be .
I have my 950 hp (750) back on as well,still rich will be taking some fuel out for next meeting.
AFR from dyno were 12.3 :1.
At the moment it is 11.4 :1.
Plugs show rich at WOT.
34 DEGREES of timing. 20220730_163643.jpg
Still turning tyres off the hit as shown in the 60ft
I had no clue where to start in reality, but kept reading the forum here and have been very lucky to talk to some very sharp minds on this forum.
These heads have been through half a dozen 383 combinations starting at running low 12s to where we are now.
After running on the dyno in may this year I think I can get this engine to make 600hp with the cylinder head/ manifold combination but with more duration on the cam at a higher rpm.i would like to retain the 1.94" - 1.5" valve combination.
CSA is a limitation on these heads as they started as a 165cc casting.