Hello Bad Bug,
I have built the very first 78 x 4" with JPM heads i guess,had the second set of 4" heads (after Roman Anders) out of the mold from Johannes,i must say my heads are slightly different then he sells them,i had 50 x 39 valves in them.
My engine has been together since 2005,i did sell my autocraftheads in 2008/2009 and fitted the MS 230 heads in 2008 or 2009 i guess.(times fly
not sure about the exact date; )
I took my engine apart last summer for the first time since 2005,can post pics if you want later .
Engine made 280Hp with 50mmIDA
I had the engine on my dyno at one day to test with the 62 Geers-terminators,but it only made 291Hp,and it ran horrible.Went back to the 50Ida 's and finally picked up some lost power over the years by fitting the WASP & raptor vents,as the car still went 11.00 after 11 years of abuse...
best time in Fast Scrap was 10.78@815kg at startline.(gearing was never up to the engine,it was originally geared for a 1776cc engine.)
Now it's time to built some "real power",so i can Retire "fast scrap"
As it's not build to go any faster,can't keep the wheels down
Must say i've always ran on E-85 with my engine.
rgds
steve@flat4to6.com