The 360 build that has more turns than Willow Springs
I texted with the former owner of this engine. He and his dad used the Fel Pro .047 8553 gaskets to lower the compression a bit instead of using the common .039 ones. He didn't remember it knocking. The rod bearings looked great. That gasket is cheap in price so i wonder about it's durability with high compression. The 1008 costs over double, the 521 SD (Severe Duty) is .050 and about double the price too.
I could just go back to using the same design of pistons they had, the Speed Pro H116CP but Summit does not have them in the .040 bore size.
One alternative is these:
1990 DODGE KB KB232.040 KB Performance Pistons | Summit Racing
The compression height is .015 higher but these have an 18 cc dish. The dish makes a 1.3 point difference in the compression ratio but if the KBs are .015 taller, I think that increases the ratio by about .2, 2 tenths. This makes a net difference around 1.1 point.
The other way to go is with the standard KB 107. I calculated these numbers after a couple FABO members showed me how to compute approximate deck clearance by using the math.
Assuming Combustion chambers on the large end (which makes sense since the engine was only rebuilt once) 72 ccs. the KB 107s 5 cc valve pockets, the .012 calculated deck clearance, a Fel Pro Severe Duty 521 SD .050 head gasket puts me right in the sweet spot.
Even if the chambers are 70 ccs, it only changes to 9.54, still streetable with 89 or 91 octane!
I texted with the former owner of this engine. He and his dad used the Fel Pro .047 8553 gaskets to lower the compression a bit instead of using the common .039 ones. He didn't remember it knocking. The rod bearings looked great. That gasket is cheap in price so i wonder about it's durability with high compression. The 1008 costs over double, the 521 SD (Severe Duty) is .050 and about double the price too.
I could just go back to using the same design of pistons they had, the Speed Pro H116CP but Summit does not have them in the .040 bore size.
One alternative is these:
1990 DODGE KB KB232.040 KB Performance Pistons | Summit Racing
The compression height is .015 higher but these have an 18 cc dish. The dish makes a 1.3 point difference in the compression ratio but if the KBs are .015 taller, I think that increases the ratio by about .2, 2 tenths. This makes a net difference around 1.1 point.
The other way to go is with the standard KB 107. I calculated these numbers after a couple FABO members showed me how to compute approximate deck clearance by using the math.
Assuming Combustion chambers on the large end (which makes sense since the engine was only rebuilt once) 72 ccs. the KB 107s 5 cc valve pockets, the .012 calculated deck clearance, a Fel Pro Severe Duty 521 SD .050 head gasket puts me right in the sweet spot.
Even if the chambers are 70 ccs, it only changes to 9.54, still streetable with 89 or 91 octane!